- •General Description
- •Applications
- •Features and Benefits
- •Typical Application Circuit
- •Absolute Maximum Ratings
- •Package Thermal Characteristics
- •Electrical Characteristics
- •Typical Operating Characteristics
- •Pin Configuration
- •Pin Description
- •Typical Application Circuit
- •Ordering Information
- •Chip Information
- •Package Information
- •Revision History
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EVALUATION KIT AVAILABLE |
|
|
MAX44242 |
20V, Low Input Bias-Current, |
|
Low-Noise, Dual Op Amplifier |
General Description
The MAX44242 provides a combination of high voltage, low noise, low input bias current in a dual channel and features rail-to-rail at the output.
This dual amplifier operates over a wide supply voltage range from a single 2.7V to 20V supply or split ±1.35V to ±10V supplies and consumes only 1.2mA quiescent supply current per channel.
The MAX44242 is a unity-gain stable amplifier with a gain-bandwidth product of 10MHz. The device outputs drive up to 200pF load capacitor without any external isolation resistor compensation.
The MAX44242 is available in 8-pin SOT23 and µMAXM packages and is rated for operation over the -40ºC to +125ºC automotive temperature range.
Applications
●● Chemical Sensor Interface
●● Photodiode Sensor Interface ●● Medical Pulse Oximetry
●● Industrial: Process and Control ●● Precision Instrumentation
Features and Benefits
●● 2.7V to 20V Single Supply or ±1.35V to ±10V Dual Supplies
●● 0.5pA (max) Input Bias Current ●● 5nV/√HZ Input Voltage Noise ●● 10MHz Bandwidth
●● 8V/µs Slew Rate
●● Rail-to-Rail Output ●● Integrated EMI Filters
●● 1.2mA Supply Current per Amplifier
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX44242.related.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Application Circuit
|
VDD |
|
MAX44242 |
PHOTODIODE |
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IN- |
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PHOTODIODE |
IN+ |
IN- |
REF |
IN+ |
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REF |
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SENSOR PRE-AMP CONFIGURATION |
19-6827 Rev 0; 12/13 |
|
MAX44242 |
20V, Low Input Bias-Current, |
|
Low-Noise, Dual Op Amplifier |
Absolute Maximum Ratings |
|
Supply Voltage (VDD to VSS) |
................................. |
-0.3V to +22V |
All Other Pins................................. |
(V SS - 0.3V) to (V DD + 0.3V) |
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Short-Circuit Duration to VDD or VSS...................................... |
1s |
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Continuous Input Current (Any ................................Pins) |
±20mA |
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Differential Input Voltage....................................................... |
|
±6V |
Continuous Power Dissipation (TA = +70°C) |
408.2mW |
|
8-Pin SOT23 (derate 5.1mW/°C ........above +70°C) |
||
8-Pin µMAX (derate 4.5mW/°C .............above +70°C) |
362mW |
Operating Temperature Range......................... |
-40°C to +125°C |
Junction Temperature....................................................... |
+150°C |
Storage Temperature Range............................. |
-65°C to +150°C |
Lead Temperature (soldering, 10s).................................. |
+300°C |
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Package Thermal Characteristics (Note 1)
SOT23 |
|
μMAX |
|
Junction-to-Ambient Thermal Resistance (θJA)......... |
196°C/W |
Junction-to-Ambient Thermal Resistance (θJA)......... |
221°C/W |
Junction-to-Case Thermal Resistance (θJC)................ |
70°C/W |
Junction-to-Case Thermal Resistance (θJC)................ |
42°C/W |
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(VDD = 10V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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POWER SUPPLY |
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Supply Voltage Range |
VDD |
Guaranteed by PSRR |
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2.7 |
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20 |
V |
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Power-Supply Rejection Ratio |
PSRR |
VDD = 2.7V to 20V, |
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TA = +25ºC |
106 |
130 |
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dB |
VCM = 0V |
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-40ºC ≤ TA ≤ +125ºC |
100 |
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Quiescent Current Per Amplifier |
IDD |
RLOAD = infinity |
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TA = +25ºC |
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1.2 |
1.6 |
mA |
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-40ºC ≤ TA ≤ +125ºC |
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1.8 |
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Power-Up Time |
tON |
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20 |
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µs |
DC CHARACTERISTICS |
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Input Common-Mode Range |
VCM |
Guaranteed by CMRR test |
VSS - 0.05 |
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VDD - 1.5 |
V |
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Common-Mode Rejection Ratio |
CMRR |
VCM = VSS - 0.05V |
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TA = +25ºC |
94 |
111 |
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dB |
to VDD - 1.5V |
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-40ºC ≤ TA ≤ +125ºC |
90 |
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Input Offset Voltage |
VOS |
TA = +25ºC |
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50 |
600 |
µV |
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-40ºC ≤ TA ≤ +125ºC |
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800 |
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Input Offset Voltage Drift (Note 3) |
TC VOS |
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0.25 |
2.5 |
µV/ºC |
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TA = +25ºC |
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0.02 |
0.5 |
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Input Bias Current (Note 3) |
IB |
-40ºC ≤ TA ≤ +85ºC |
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10 |
pA |
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-40ºC ≤ TA ≤ +125ºC |
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50 |
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www.maximintegrated.com |
Maxim Integrated │ 2 |
MAX44242 |
20V, Low Input Bias-Current, |
|
Low-Noise, Dual Op Amplifier |
Electrical Characteristics (continued)
(VDD = 10V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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TA = +25ºC |
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0.04 |
0.5 |
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Input Offset Current (Note 3) |
IOS |
-40ºC ≤ TA ≤ +85ºC |
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10 |
pA |
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-40ºC ≤ TA ≤ +125ºC |
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25 |
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Open Loop Gain |
AVOL |
250mV ≤ VOUT ≤ |
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TA = +25ºC |
134 |
145 |
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dB |
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VDD - 250mV |
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-40ºC ≤ TA ≤ +125ºC |
129 |
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Input Resistance |
RIN |
Differential |
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50 |
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MΩ |
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Common mode |
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200 |
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Output Short-Circuit Current |
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To VDD or VSS |
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Noncontinuous |
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95 |
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mA |
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Output Voltage Low |
VOL |
VOUT - VSS |
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RLOAD = 10kΩ to VDD/2 |
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25 |
mV |
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RLOAD = 2kΩ to VDD/2 |
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85 |
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Output Voltage High |
VOH |
VDD - VOUT |
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RLOAD = 10kΩ to VDD/2 |
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37 |
mV |
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RLOAD = 2kΩ to VDD/2 |
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135 |
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AC CHARACTERISTICS |
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Input Voltage-Noise Density |
en |
f = 1kHz |
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5 |
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nV/√HZ |
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Input Voltage Noise |
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0.1Hz ≤ f ≤ 10Hz |
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1.6 |
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µVP-P |
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Input Current-Noise Density |
IN |
f = 1kHz |
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0.3 |
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pA/√HZ |
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Input Capacitance |
CIN |
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4 |
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pF |
Gain-Bandwidth Product |
GBW |
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10 |
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MHz |
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Phase Margin |
PM |
CLOAD = 20pF |
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60 |
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deg |
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Slew Rate |
SR |
AV = 1V/V, VOUT = 2VP-P, 10% to 90% |
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8 |
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V/µs |
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Capacitive Loading |
CLOAD |
No sustained oscillation, AV = 1V/V |
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200 |
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pF |
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Total Harmonic Distortion Plus |
THD+N |
VOUT = 2VP-P, |
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f = 1kHz |
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-124 |
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dB |
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Noise |
AV = +1V/V |
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f = 20kHz |
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-100 |
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f = 400MHz |
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35 |
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EMI Rejection Ratio |
EMIRR |
VRF_PEAK = 100mV |
f = 900MHz |
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40 |
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dB |
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f = 1800MHz |
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50 |
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f = 2400MHz |
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57 |
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Settling Time |
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To 0.01%, VOUT = 2V step, AV = -1V/V |
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1 |
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µs |
Note 2: All devices are production tested at TA = +25°C. Specifications over temperature are guaranteed by design. Note 3: Guaranteed by design.
www.maximintegrated.com |
Maxim Integrated │ 3 |
MAX44242 |
20V, Low Input Bias-Current, |
|
Low-Noise, Dual Op Amplifier |
Typical Operating Characteristics
(VDD = 10V, VSS = 0V, outputs have RL = 10kΩ to VDD/2. TA = +25°C, unless otherwise specified.)
INPUT OFFSET VOLTAGE HISTOGRAM |
INPUT OFFSET VOLTAGE DRIFT HISTOGRAM |
SUPPLY CURRENT PER AMPLIFIER |
vs. TEMPERATURE |
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16 |
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toc01 |
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HISTOGRAM |
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14 |
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N (%) |
12 |
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10 |
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OCCURRENCE |
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8 |
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6 |
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4 |
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2 |
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0 |
-250 -200 -150 -100 -50 |
0 |
50 100 150 |
200 250 |
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INPUT OFFSET VOLTAGE (μV) |
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25 |
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toc02 |
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HISTOGRAM |
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A) |
1300 |
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(μ |
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20 |
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AMPLIFIER |
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N (%) |
15 |
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1200 |
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OCCURRENCE |
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CURRENT PER |
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10 |
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1100 |
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5 |
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SUPPLY |
1000 |
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0 |
-600 -400 -200 |
0 |
200 |
400 |
600 |
900 |
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INPUT OFFSET VOLTAGE DRIFT (nV/°C) |
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toc03
VIN = VDD/2
NO LOAD
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VDD = 20V |
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VDD = 15V |
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VDD = 10V |
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VDD = 5.5V |
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VDD = 2.7V |
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-50 |
-25 |
0 |
25 |
50 |
75 |
100 |
125 |
150 |
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TEMPERATURE (°C) |
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INPUT OFFSET VOLTAGE
vs. INPUT COMMON-MODE VOLTAGE vs. TEMPERATURE
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20 |
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toc04 |
300 |
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VIN = VDD/2 |
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TA = +125°C |
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0 |
10kΩ |
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250 |
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INPUT OFFSET VOLTAGE (μV) |
-20 |
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TA |
= +85°C |
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INPUT BIAS CURRENT (pA) |
200 |
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-40 |
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TA = +25°C |
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150 |
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-60 |
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100 |
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-80 |
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50 |
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-100 |
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0 |
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-120 |
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TA = -40°C |
-50 |
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-140 |
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-100 |
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-1 |
1 |
3 |
5 |
7 |
9 |
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INPUT COMMON-MODE VOLTAGE (V) |
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INPUT BIAS CURRENT |
COMMON-MODE REJECTION RATIO |
vs. INPUT COMMON-MODE VOLTAGE |
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vs. TEMPERATURE |
vs. TEMPERATURE |
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toc05 |
140 |
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toc06 |
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TA = +125°C |
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(dB) |
120 |
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RATIO |
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100 |
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REJECTION |
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80 |
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TA = +105°C |
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COMMON-MODE |
60 |
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20 |
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40 |
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TA = +25°C |
TA = +85°C |
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0 |
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0 |
2 |
4 |
6 |
8 |
10 |
-50 |
-25 |
0 |
25 |
50 |
75 |
100 |
125 |
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INPUT COMMON-MODE VOLTAGE (V) |
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TEMPERATURE (°C) |
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POWER-SUPPLY REJECTION RATIO (dB)
POWER-SUPPLY REJECTION RATIO vs. TEMPERATURE
150 |
toc07 |
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130
110
90
70
50
30
-50 |
-25 |
0 |
25 |
50 |
75 |
100 |
125 |
TEMPERATURE (°C)
AC CMRR (dB)
AC CMRR vs. FREQUENCY
toc08
140
120
100
80
60
40
20
0
1 |
100 |
10000 |
1000000 |
FREQUENCY (Hz)
www.maximintegrated.com |
Maxim Integrated │ 4 |
MAX44242 |
20V, Low Input Bias-Current, |
|
Low-Noise, Dual Op Amplifier |
Typical Operating Characteristics (continued)
(VDD = 10V, VSS = 0V, outputs have RL = 10kΩ to VDD/2. TA = +25°C, unless otherwise specified.)
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120 |
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100 |
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(dB) |
80 |
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AC PSRR |
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60 |
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40 |
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20 |
10
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5 |
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(dB) |
0 |
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-5 |
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RESPONSE |
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-10 |
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SIGNAL- |
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-15 |
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LARGE |
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-20 |
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-25 |
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-30 |
10
AC PSRR vs. FREQUENCY
toc09
1,000 |
100,000 |
10,000,000 |
FREQUENCY (Hz)
LARGE-SIGNAL RESPONSE vs. FREQUENCY
toc12
2VP-P Input
1,000 |
100,000 |
10,000,000 |
FREQUENCY (Hz)
AVOL (dB)
INPUT VOLTAGE-NOISEDENSITY(nV/√HZ)
130
110
90
70
50
30
10
-10
-30
10
40
35
30
25
20
15
10
5
0
10
INPUT CURRENT-NOISE DENSITY vs. FREQUENCY
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5 |
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toc15 |
(pA/√HZ) |
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4 |
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DENSITY |
3 |
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CURRENT-NOISE |
2 |
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INPUT |
1 |
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0 |
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10 |
100 |
1000 |
10000 |
FREQUENCY (Hz)
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AVOL |
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SMALL-SIGNAL RESPONSE |
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vs. FREQUENCY |
toc10 |
10 |
vs. FREQUENCY |
toc11 |
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(dB) |
5 |
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-5 |
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RESPONSE |
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0 |
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-SIGNAL |
-10 |
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SMALL |
-15 |
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100mVP-P |
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-20 |
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INPUT |
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1,000 |
100,000 |
10,000,000 |
10 |
1,000 |
100,000 |
10,000,000 |
FREQUENCY (Hz) |
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FREQUENCY (Hz) |
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INPUT VOLTAGE-NOISE DENSITY |
0.1 Hz to 10 Hz PEAK TO PEAK NOISE |
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vs. FREQUENCY |
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toc13 |
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toc14 |
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VOUTN
VINSIDE
1μV/div
VBACKUP
en = 1.6μVP-P
100 |
1000 |
10000 |
100000 |
FREQUENCY (Hz)
OUTPUT VOLTAGE HIGH (VDD - VOUT)
vs. OUTPUT SOURCE CURRENT
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650 |
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toc16 |
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600 |
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550 |
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(mV) |
500 |
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450 |
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HIGH |
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400 |
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SWING |
350 |
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300 |
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OUTPUT |
250 |
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200 |
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150 |
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100 |
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50 |
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0 |
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0 |
4 |
8 |
12 |
16 |
20 |
OUTPUT SOURCE CURRENT (mA)
www.maximintegrated.com |
Maxim Integrated │ 5 |
MAX44242 |
20V, Low Input Bias-Current, |
|
Low-Noise, Dual Op Amplifier |
Typical Operating Characteristics (continued)
(VDD = 10V, VSS = 0V, outputs have RL = 10kΩ to VDD/2. TA = +25°C, unless otherwise specified.)
OUTPUT SWING LOW (mV)
OUTPUT VOLTAGE LOW (VOUT)
vs. OUTPUT SINK CURRENT
600 |
toc17 |
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550
500
450
400
350
300
250
200
150
100
50
0
0 |
5 |
10 |
15 |
20 |
25 |
30 |
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OUTPUT SINK CURRENT (mA) |
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OUTPUT VOLTAGE SWING HIGH |
OUTPUT VOLTAGE SWING LOW |
vs. TEMPERATURE |
vs. TEMPERATURE |
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120 |
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toc18 |
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70 |
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toc19 |
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(mV)OL |
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(mV) |
100 |
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60 |
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RL = 2kΩ |
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SWINGVOLTAGEOUTPUTHIGH |
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SWINGVOLTAGEOUTPUTLOW V |
50 |
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RL = 2kΩ |
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80 |
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60 |
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40 |
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30 |
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RL = 10kΩ |
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40 |
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RL = 10kΩ |
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20 |
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20 |
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10 |
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0 |
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0 |
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-50 |
-20 |
10 |
40 |
70 |
100 |
130 |
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-50 |
-20 |
10 |
40 |
70 |
100 |
130 |
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TEMPERATURE (°C) |
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TEMPERATURE (°C) |
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SMALL-SIGNAL RESPONSE |
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LARGE-SIGNAL RESPONSE |
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vs. TIME |
toc20 |
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vs. TIME |
toc21 |
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No LOAD |
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No LOAD |
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VOUTN |
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VIN |
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VOUTN |
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VIN |
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1V/div |
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VINSIDE |
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50mV/div |
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VINSIDE |
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VBACKUP |
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VBACKUP |
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VOUT |
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VOUT |
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1V/div |
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50mV/div |
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1μ00nFs/div |
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1μS/DIV |
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STABILITY |
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STABILITY |
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vs. CAPACITIVE LOAD AND |
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vs. CAPACITIVE LOAD AND |
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100 |
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RESISTIVE LOAD |
toc22 |
100 |
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ISOLATION RESISTOR |
toc23 |
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(Ω) |
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10 |
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RISO |
10 |
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(kLOADRESISTIVEΩ) |
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RESISTANCEISOLATION |
0.1 |
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STABLE |
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1 |
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UNSTABLE |
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1 |
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UNSTABLE |
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0.1 |
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0.01 |
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0.01 |
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STABLE |
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0.001 |
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100 |
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1000 |
10000 |
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100000 |
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100 |
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1000 |
10000 |
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100000 |
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CAPACITIVE LOAD (pF) |
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CAPACITIVE LOAD (pF) |
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www.maximintegrated.com |
Maxim Integrated │ 6 |
MAX44242 |
20V, Low Input Bias-Current, |
|
Low-Noise, Dual Op Amplifier |
Typical Operating Characteristics (continued)
(VDD = 10V, VSS = 0V, outputs have RL = 10kΩ to VDD/2. TA = +25°C, unless otherwise specified.)
TOTAL HARMONIC DISTORTION (dB)
TOTAL HARMONIC DISTORTION vs. FREQUENCY
0 |
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toc25 |
2VP-P INPUT |
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-10 |
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-20 |
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-30 |
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-40 |
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-50 |
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-60 |
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-70 |
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-80 |
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-90 |
RLOAD = 600Ω RLOAD = 1kΩ |
RLOAD = 10kΩ |
||
-100 |
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-110 |
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-120 |
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10 |
100 |
1000 |
10000 |
100000 |
FREQUENCY (Hz)
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TOTAL HARMONIC DISTORTION |
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vs. INPUT FREQUENCY |
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0 |
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vs. AMPLITUDE |
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toc26 |
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(dB) |
-20 |
RLOAD = 10kΩ |
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DISTORTION |
-40 |
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-60 |
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1kHz INPUT |
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FREQUENCY |
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HARMONIC |
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-80 |
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20kHz INPUT |
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TOTAL |
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-100 |
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FREQUENCY |
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-120 |
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0 |
2 |
4 |
6 |
8 |
10 |
FREQUENCY (Hz)
CROSSTALK (dB)
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CROSSTALK |
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0 |
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vs. FREQUENCY |
toc27 |
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-20 |
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-40 |
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-60 |
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-80 |
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-100 |
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-120 |
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1 |
10 |
100 |
1000 |
10000 |
100000 1000000 |
FREQUENCY (Hz)
EMI REJECTION RATIO (dB)
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EMIRR |
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100 |
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vs. FREQUENCY |
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toc29 |
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80 |
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60 |
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40 |
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20 |
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0 |
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10 |
100 |
1000 |
10000 |
FREQUENCY (MHz)
www.maximintegrated.com |
Maxim Integrated │ 7 |