MAX9915EXT

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MAX9914 toc03

TA = +85°C

TA = -40°C

TA = +25°C

TA = -40°C

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MAX9914–MAX9917

General Description

The single MAX9914/MAX9915 and dual MAX9916/ MAX9917 operational amplifiers feature maximized ratio of gain bandwidth to supply current and are ideal for battery-powered applications such as portable instrumentation, portable medical equipment, and wireless handsets. These CMOS op amps feature an ultra-low 1pA input bias current, rail-to-rail inputs and outputs, low 20μA supply current, and operate from a single 1.8V to 5.5V supply. For additional power conservation, the

MAX9915/MAX9917 feature a low-power shutdown mode that reduces supply current to 1nA, and puts the amplifier outputs in a high-impedance state. These devices are unity-gain stable with a 1MHz gain-bandwidth product.

The MAX9914 and MAX9915 are available in 5-pin and 6-pin SC70 packages, respectively. The MAX9916 is available in an 8-pin SOT23 package, and the MAX9917 in a 10-pin μMAX® package. All devices are specified over the -40°C to +85°C extended operating temperature range.

Applications

●● Portable Medical Devices

●● Portable Test Equipment

●● RF Tags

●● Laptops

●● Data-Acquisition Equipment

Typical Operating Circuit

	3V
	VDD
	MAX9916
IN+	INA+
IN+
	OUTA		OUT
			OUT
			R1
			47kΩ
	INA-		GAIN =	(R1 + R2 + R3 + R4)
			GAIN =	(R1 + R2 + R3 + R4)
RG*				(R2 + R3)
RG*		R2	FOR R1 = R4 AND R2 = R3
IN-	INB+	10kΩ	FOR R1 = R4 AND R2 = R3
IN-				R4
	OUTB		GAIN =	1 + R2
			R3
	INB-		10kΩ
	INB-
	VSS		R4
			R4
			47kΩ

MICROPOWER, TWO-OP-AMP INSTRUMENTATION AMPLIFIER *OPTIONAL INPUT RESISTOR RG, IS FOR GAIN ADJUSTMENT

1MHz, 20μA, Rail-to-Rail I/O Op Amps with Shutdown

Features

●● High 1MHz GBW

●● Ultra-Low 20μA Supply Current

●● Single 1.8V to 5.5V Supply Voltage Range ●● Ultra-Low 1pA Input Bias Current

●● Rail-to-Rail Input and Output Voltage Ranges ●● Low ±200μV Input Offset Voltage

●● Low 0.001μA Shutdown Current

●● High-Impedance Output During Shutdown (MAX9915/MAX9917)

●● Unity-Gain Stable

●● Available in Tiny SC70, SOT23, and μMAX Packages

Ordering Information

PART	TEMP RANGE		PIN-	TOP
PART	TEMP RANGE		PACKAGE MARK
			PACKAGE MARK
MAX9914EXK+T	-40°C to +85°C		5 SC70	AGB
MAX9914EXK-T	-40°C to +85°C		5 SC70	AGB

MAX9915EXT+T	-40°C to +85°C		6 SC70	ACB
MAX9915EXT-T	-40°C to +85°C		6 SC70	ACB

MAX9916EKA+T	-40°C to +85°C		8 SOT23	AEJZ
MAX9916EKA-T	-40°C to +85°C		8 SOT23	AEJZ
MAX9917EUB	-40°C to +85°C		10 µMAX	—
MAX9917EUB+	-40°C to +85°C		10 µMAX	—

+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Selector Guide

PART	AMPLIFIERS	SHUTDOWN		PACKAGE
PART	PER		MODE	PACKAGE
	PACKAGE		MODE
	PACKAGE

MAX9914EXK+T	1		No	5 SC70

MAX9915EXT+T	1		Yes	6 SC70

MAX9916EKA+T	2		No	8 SOT23

MAX9917EUB+	2		Yes	10 µMAX

μMAX is a registered trademark of Maxim Integrated Products, Inc.

19-3407; Rev 3; 11/14

MAX9914–MAX9917			1MHz, 20μA, Rail-to-Rail
			I/O Op Amps with Shutdown
Absolute Maximum Ratings
Power-Supply Voltage (VDD to VSS)....................		-0.3V to +6.0V	8-Pin SOT23 (derate 5.1mW/°C above +70°C)...........		408mW
IN_+, IN_-, OUT_, SHDN_.............	(VSS - 0.3V) to (VDD + 0.3V)		10-Pin μMAX (derate 5.6mW/°C above +70°C)...........		444mW
Current into IN_+, IN_-......................................................		±20mA	Operating Temperature Range...........................	-40°C to +85°C
Output Short-Circuit Duration to VDD or VSS............		Continuous	Junction Temperature.......................................................		+150°C
Continuous Power Dissipation (TA	= +70°C)	247mW	Storage Temperature Range.............................	-65°C to +150°C
5-Pin SC70 (derate 3.1mW/°C above +70°C).............		247mW	Lead Temperature (soldering, 10s)..................................		+300°C
6-Pin SC70 (derate 3.1mW/°C above +70°C).............		245mW	Soldering Temperature (reflow)........................................		+260°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.

Electrical Characteristics

(VDD = 1.8V to 5.5V, VSS = 0V, V CM = 0V, V OUT = V DD/2, RL = ∞ connected to VDD/2,				SHDN_ = V DD,		TA = +25°C, unless
otherwise noted.) (Note 1)

PARAMETER	SYMBOL	CONDITIONS		MIN	TYP	MAX	UNITS

Supply Voltage Range	VDD	Guaranteed by PSRR test		1.8		5.5	V
		MAX9914/MAX9915	VDD = 1.8V		20
Supply Current	IDD	MAX9914/MAX9915	VDD = 5.5V		20	25	µA
Supply Current	IDD	MAX9916/MAX9917	VDD = 1.8V		40		µA
			VDD = 1.8V		40
			VDD = 5.5V		40	50
Shutdown Supply Current	IDD(SHDN_)	SHDN_ = GND, MAX9915/MAX9917			0.001	0.5	µA
Input Offset Voltage	VOS				±0.2	±1	mV
Input-Offset-Voltage Matching		MAX9916/MAX9917			±250		µV

Input Bias Current	IB	(Note 2)			±1	±10	pA
Input Offset Current	IOS	(Note 2)			±1	±10	pA
Input Resistance	RIN	Common mode			1		GΩ

		Differential mode, -1mV < VIN < +1mV			10
		Differential mode, -1mV < VIN < +1mV			10
Input Common-Mode Range	VCM	Guaranteed by CMRR test		VSS - 0.1		VDD + 0.1	V
Common-Mode Rejection Ratio	CMRR	-0.1V < VCM < VDD + 0.1V, VDD = 5.5V		70	80		dB
Power-Supply Rejection Ratio	PSRR	1.8V < VDD < 5.5V		65	85		dB
		25mV < VOUT < VDD - 25mV,		95	120
		RL = 100kΩ, VDD = 5.5V		95	120
Open-Loop Gain	AVOL	RL = 100kΩ, VDD = 5.5V					dB
Open-Loop Gain	AVOL	100mV < VOUT < VDD - 100mV,		95	110		dB
		RL = 5kΩ, VDD = 5.5V		95	110
		RL = 5kΩ, VDD = 5.5V
			RL = 100kΩ		2.5	5
Output-Voltage-Swing High	VOH	VDD - VOUT	RL = 5kΩ		50	70	mV
			RL = 1kΩ		250
			RL = 100kΩ		2.5	5
Output-Voltage-Swing Low	VOL	VOUT - VSS	RL = 5kΩ		50	70	mV
			RL = 1kΩ		250
Channel-to-Channel Isolation	CHISO	Specified at DC, MAX9916/MAX9917			100		dB
Output Short-Circuit Current	IOUT(SC)				±15		mA

www.maximintegrated.com

Maxim Integrated │ 2

MAX9914–MAX9917					1MHz, 20μA, Rail-to-Rail
					I/O Op Amps with Shutdown
Electrical Characteristics (continued)
(VDD = 1.8V to 5.5V, VSS = 0V, V CM = 0V, V OUT = V DD/2,				RL = ∞ connected to VDD/2,		SHDN_ = V DD,		TA = +25°C, unless
otherwise noted.) (Note 1)

PARAMETER		SYMBOL		CONDITIONS		MIN	TYP	MAX	UNITS
SHDN_ Logic Low		VIL	VDD = 1.8V to 3.6V, MAX9915/MAX9917					0.4	V
SHDN_ Logic Low		VIL	VDD = 3.6V to 5.5V, MAX9915/MAX9917					0.8	V
			VDD = 3.6V to 5.5V, MAX9915/MAX9917					0.8
SHDN Logic High		VIH	VDD = 1.8V to 3.6V, MAX9915/MAX9917			1.4			V
SHDN Logic High		VIH	VDD = 3.6V to 5.5V, MAX9915/MAX9917			2			V
			VDD = 3.6V to 5.5V, MAX9915/MAX9917			2
SHDN_ Input Bias Current		IIL	SHDN_ = VSS, MAX9915/MAX9917 (Note 2)					1	nA
SHDN_ Input Bias Current		IIH	SHDN_ = VDD, MAX9915/MAX9917					500	nA
		IIH	SHDN_ = VDD, MAX9915/MAX9917					500
Output Leakage in Shutdown	IOUT(SHDN_)		SHDN_ = VSS, VOUT = 0V to VDD,				1	500	nA
Output Leakage in Shutdown	IOUT(SHDN_)		MAX9915/MAX9917				1	500	nA
			MAX9915/MAX9917
Gain-Bandwidth Product							1		MHz

Phase Margin			CL = 15pF				45		degrees
Gain Margin			CL = 15pF				10		dB
Slew Rate							0.5		V/µs

Capacitive-Load Stability (See					AV = 1V/V		30
Capacitive-Load Stability (See			No sustained		AV = 10V/V		100
the Driving Capacitive Loads		CLOAD	No sustained		AV = 10V/V		100		pF
the Driving Capacitive Loads		CLOAD	oscillations		RL = 5kΩ, AV = 1V/V		100		pF
Section)			oscillations		RL = 5kΩ, AV = 1V/V		100
					RISO = 1kΩ, AV = 1V/V		100
Input Voltage-Noise Density			f = 1kHz				160		nV/√HZ

Input Current-Noise Density			f = 1kHz				0.001		pA/√HZ

Settling Time			To 0.1%, VOUT = 2V step, AV = -1V/V				3.5		µs
Delay Time to Shutdown		tSH	IDD = 5% of normal operation,				2		µs
Delay Time to Shutdown		tSH	VDD = 5.5V, VSHDN_ = 5.5V to 0 step				2		µs
			VDD = 5.5V, VSHDN_ = 5.5V to 0 step
Delay Time to Enable		tEN	VOUT = 2.7V, VOUT settles to 0.1%,				10		µs
Delay Time to Enable		tEN	VDD = 5.5V, VSHDN_ = 0 to 5.5V step				10		µs
			VDD = 5.5V, VSHDN_ = 0 to 5.5V step
Power-Up Time			VDD = 0 to 5.5V step				2		µs

Electrical Characteristics

(VDD = 1.8V to 5.5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL = ∞ connected to VDD/2, SHDN_ = VDD, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER	SYMBOL	CONDITIONS		MIN	TYP	MAX	UNITS

Supply Voltage Range	VDD	Guaranteed by PSRR test		1.8		5.5	V
Supply Current	IDD	MAX9914/MAX9915	VDD = 5.5V			29	µA
Supply Current	IDD	MAX9916/MAX9917	VDD = 5.5V			60	µA
		MAX9916/MAX9917				60

Shutdown Supply Current	IDD(SHDN_)	SHDN_ = GND, MAX9915/MAX9917				1	µA
Input Offset Voltage	VOS					±3	mV

www.maximintegrated.com

Maxim Integrated │ 3

MAX9914–MAX9917	1MHz, 20μA, Rail-to-Rail
	I/O Op Amps with Shutdown

Electrical Characteristics (continued)

(VDD = 1.8V to 5.5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL = ∞ connected to VDD/2, SHDN_ = VDD, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER	SYMBOL	CONDITIONS		MIN	TYP	MAX	UNITS
Input-Offset-Voltage					±5
Temperature Coefficient	TCVOS				±5		µV/°C
(Note 2)

Input Bias Current	IB					±30	pA
Input Offset Current	IOS					±20	pA
Input Common-Mode Range	VCM	Guaranteed by CMRR test		VSS - 0.05	VDD + 0.05		V
Common-Mode Rejection Ratio	CMRR	-0.05V < VCM < VDD + 0.05V, VDD = 5.5V		60			dB
Power-Supply Rejection Ratio	PSRR	1.8V < VDD < 5.5V		60			dB
		25mV < VOUT < VDD - 25mV,		85
		RL = 100kΩ, VDD = 5.5V		85
Open-Loop Gain	AVOL	RL = 100kΩ, VDD = 5.5V					dB
Open-Loop Gain	AVOL	150mV < VOUT < VDD - 150mV,		85			dB
		RL = 5kΩ, VDD = 5.5V		85
		RL = 5kΩ, VDD = 5.5V
Output-Voltage-Swing High	VOH	VDD - VOUT	RL = 100kΩ			6	mV
Output-Voltage-Swing High	VOH	VDD - VOUT	RL = 5kΩ			90	mV
			RL = 5kΩ			90
Output-Voltage-Swing Low	VOL	VOUT - VSS	RL = 100kΩ			5	mV
Output-Voltage-Swing Low	VOL	VOUT - VSS	RL = 5kΩ			90	mV
			RL = 5kΩ			90
SHDN_ Logic Low	VIL	VDD = 1.8V to 3.6V, MAX9915/MAX9917				0.4	V
SHDN_ Logic Low	VIL	VDD = 3.6V to 5.5V, MAX9915/MAX9917				0.8	V
		VDD = 3.6V to 5.5V, MAX9915/MAX9917				0.8
SHDN_ Logic High	VIH	VDD = 1.8V to 3.6V, MAX9915/MAX9917		1.4			V
SHDN_ Logic High	VIH	VDD = 3.6V to 5.5V, MAX9915/MAX9917		2			V
		VDD = 3.6V to 5.5V, MAX9915/MAX9917		2
SHDN_ Input Bias Current	IIL	SHDN_ = VSS, MAX9915/MAX9917				5	nA
SHDN_ Input Bias Current	IIH	SHDN_ = VDD, MAX9915/MAX9917				1000	nA
	IIH	SHDN_ = VDD, MAX9915/MAX9917				1000	nA
Output Leakage in Shutdown	IOUT(SHDN_)	SHDN_ = VSS, VOUT = 0V to VDD,				1000	nA
Output Leakage in Shutdown	IOUT(SHDN_)	MAX9915/MAX9917				1000	nA

Note 1: Specifications are 100% tested at TA = +25°C (exceptions noted). All temperature limits are guaranteed by design. Note 2: Guaranteed by design, not production tested

www.maximintegrated.com

Maxim Integrated │ 4

MAX9914–MAX9917	1MHz, 20μA, Rail-to-Rail
	I/O Op Amps with Shutdown

Typical Operating Characteristics

(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA = +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. SUPPLY VOLTAGE

	50					toc01
	45	TA = +25°C	TA = -40°C		TA = +85°C	toc01
	45	TA = +25°C	TA = -40°C		TA = +85°C	MAX9914
	40				DUAL	MAX9914
	35
(µA)	30	TA = +25°C	TA = -40°C		TA = +85°C
(µA)	25	TA = +25°C	TA = -40°C		TA = +85°C
CC	25
CC
I	20
	20				SINGLE
	15				SINGLE
	15
	10
	5
	0	2.6	3.3	4.1	4.8
	1.8	2.6	3.3	4.1	4.8	5.5
			VSUPPLY (V)

SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE

	12					toc02			1000
CURRENT (nA)	10					toc02
	10					MAX9914			750
	8								500
									500
	6						(µV)		250
	4								250
	4								0
SUPPLY	2						OS		0
							OS
							V		-250
							V
SHUTDOWN	0
	0
	-2								-500
	-2
	-4								-750
	-4								-750
	-6	-15	10	35	60			-1000
	-40	-15	10	35	60	85
			TEMPERATURE (°C)

INPUT OFFSET VOLTAGE

vs. INPUT COMMON-MODE VOLTAGE

INPUT OFFSET VOLTAGE vs. TEMPERATURE

	0					toc04		7
	-20					toc04		6
	-20					MAX9914		6
	-40					MAX9914		5
	-40							5
	-60							4
(µV)	-80						(pA)	3
(µV)	-100						(pA)	2
OS	-100						B	2
OS							B
V	-120						I	1
	-120							1
	-140							0
	-160							-1
	-180							-2
	-200	-15	10	35	60			-3
	-40	-15	10	35	60	85
			TEMPERATURE (°C)

INPUT BIAS CURRENT vs. TEMPERATURE

					toc05		5
					toc05		4
					MAX9914		4
					MAX9914		3
							3
		IB-					2
	IB+	IB-					1
	IB+					(pA)	1
						(pA)	0
						B	0
						B
						I	-1
							-1
							-2
							-3
							-4
-40	-15	10	35	60	85		-5
-40	-15	10	35	60	85
		TEMPERATURE (°C)

INPUT BIAS CURRENT

vs. INPUT COMMON-MODE VOLTAGE

								MAX9914 toc06
-0.5	0	0.5	1.0	1.5	2.0	2.5	3.0	3.5
				VCM (V)

POWER-SUPPLY REJECTION RATIO vs. FREQUENCY

	0					toc07	140
	-10					toc07
	-10					MAX9914	120
	-20						120


	-30						100
(dB)	-40					(dB)	80
PSRR	-50					CMRR	60
PSRR	-60					CMRR	60
	-60
	-70						40
	-80						20
	-90						20
	-90
	-100	1	10	100	1k		0
	0.1	1	10	100	1k	10k
			FREQUENCY (Hz)

COMMON-MODE REJECTION RATIO vs. TEMPERATURE

					toc08		0
					toc08		-10
					MAX9914		-10
					MAX9914		-20
							-20
							-30
						(dB)	-40
						(dB)
						CMRR	-50
						CMRR	-60
							-60
							-70
							-80
							-90
-40	-15	10	35	60	85		-100
-40	-15	10	35	60	85
		TEMPERATURE (°C)

COMMON-MODE REJECTION RATIO vs. FREQUENCY

					MAX9914 toc09
1	10	100	1k	10k	100k
		FREQUENCY (Hz)

www.maximintegrated.com

Maxim Integrated │ 5

MAX9914–MAX9917	1MHz, 20μA, Rail-to-Rail
	I/O Op Amps with Shutdown

Typical Operating Characteristics (continued)

(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA = +25°C, unless otherwise noted.)

SLEW RATE vs. SUPPLY VOLTAGE

	3.5				toc10
	3.0				toc10
	3.0				MAX9914
	2.5				MAX9914
	2.5
(V/µs)	2.0
(V/µs)	1.5
RATE	1.5
RATE	1.0
SLEW	0.5
SLEW	0
	0
	-0.5
	-1.0
	-1.5
	1.8	2.8	3.8	4.8	5.5
		SUPPLY VOLTAGE (V)

OUTPUT-SWING HIGH vs. TEMPERATURE

	1000					toc11		1000
						toc11
(mV)		RL = 1kΩ				MAX9914	(mV)
(mV)						MAX9914	(mV)
SWING	100				RL = 5kΩ		SWING	100
SWING							SWING
VOLTAGE							VOLTAGE
VOLTAGE	10	RL = 100kΩ					VOLTAGE	10
OUTPUT	10	RL = 100kΩ					OUTPUT	10
OUTPUT				RL TO VSS			OUTPUT
				RL TO VSS
	1			VOH = VDD - VOUT				1
	1	-15	10	35	60			1
	-40	-15	10	35	60	85
			TEMPERATURE (°C)

OUTPUT-SWING LOW vs. TEMPERATURE

RL = 1kΩ	toc12
	MAX9914
	RL = 5kΩ
RL = 100kΩ
	RL TO VDD
	VOL = VOUT - VSS

-40	-15	10	35	60	85
		TEMPERATURE (°C)

OPEN-LOOP GAIN

vs. TEMPERATURE (RL TO VSS)

	140						RL = 100kΩ		toc13				160
							RL = 100kΩ		toc13
	120								MAX9914				140
									MAX9914				120
	100												120
	100				RL = 5kΩ
(dB)	80				RL = 5kΩ							(dB)	100
(dB)	80					RL = 1kΩ						(dB)	80
VOL	60											VOL	80
VOL												VOL
A												A	60


	40												40
													40
	20												20
	0	-40	-15		10	35		60	85				0
		-40	-15		10	35		60	85
				TEMPERATURE (°C)
				GAIN AND PHASE
	vs. FREQUENCY (RL = 5kΩ, CLOAD = 100pF)
	100							MAX9914 toc16		225			0
	100									225			0
	80		GAIN				AV = 1000V/V			180			-20
	60		GAIN							135
	60									135
	40									90	PHASE (DEGREES)	CROSSTALK (dB)	-40
GAIN (dB)	20									45			-40
	20									45
	0	PHASE								0			-60
	-20	PHASE								-45			-60
	-20									-45
	-40									-90			-80
	-60									-135
	-80									-180			-100
	-100									-225
	-120	1	10	100	1k	10k	100k	1M	10M	-270			-120
		1	10	100	1k	10k	100k	1M	10M
				FREQUENCY (Hz)

		OPEN-LOOP GAIN					GAIN AND PHASE
	vs. TEMPERATURE (RL TO VDD)						vs. FREQUENCY (RL = ∞, CLOAD = 15pF)
					toc14	100	MAX9914 toc15	225
			RL = 100kΩ			100		225
			RL = 100kΩ			80	AV = 1000V/V 180
		RL = 5kΩ			MAX9914	80	AV = 1000V/V 180
					MAX9914	60	GAIN	135
							GAIN
						40		90
					(dB)	20		45
			RL = 1kΩ		(dB)	0	PHASE	0
					GAIN	-20	PHASE	-45
					GAIN	-20		-45
						-40		-90
						-60		-135
						-80		-180
						-100		-225
-40	-15	10	35	60	85	-120	1 10 100 1k 10k 100k 1M 10M	-270
-40	-15	10	35	60	85		1 10 100 1k 10k 100k 1M 10M
		TEMPERATURE (°C)					FREQUENCY (Hz)
	CROSSTALK vs. FREQUENCY					TOTAL HARMONIC DISTORTION PLUS NOISE
	CROSSTALK vs. FREQUENCY						vs. FREQUENCY

	MAX9916/MAX9917			toc17		0			toc18
				toc17		-10			toc18
				MAX9914					MAX9914

						-20
						-20
					(dB)	-30
					(dB)	-40
					THD+N	-40
					THD+N	-50
						-50
						-60
						-70	VOUT = 2VP-P
						-80
						-90
10	100	1k	10k	100k		-100	100	1k
10	100	1k	10k	100k		10	100	1k	10k
		FREQUENCY (Hz)					FREQUENCY (Hz)

PHASE (DEGREES)

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Maxim Integrated │ 6

MAX9914–MAX9917	1MHz, 20μA, Rail-to-Rail
	I/O Op Amps with Shutdown

Typical Operating Characteristics (continued)

(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA = +25°C, unless otherwise noted.)

VOLTAGE-NOISE DENSITY	RESISTOR ISOLATION
vs. FREQUENCY	vs. CAPACITIVE LOAD

10,000						toc19	3000			toc20
						toc19		AV = 1V/V		toc20
Hz)						MAX9914		AV = 1V/V		MAX9914
Hz)						MAX9914	2500	FOR AV = 10V/V NO RISO NEEDED		MAX9914
							2500	FOR AV = 10V/V NO RISO NEEDED
√							2000
(nV/							2000
(nV/							(Ω)
NOISE	1000						(Ω)
NOISE	1000						ISO1500
VOLTAGE							R
							1000
							500
	100						0
	1	10	100	1k	10k	100k	10	100	1000	10,000
			FREQUENCY (Hz)						CLOAD (pF)

VDD

1V/div

OUTPUT 500mV/div

POWER-UP SETTLING TIME

MAX9914 toc21

IN+ = VDD / 2

AV = 1V/V

1µs/div

SHUTDOWN RESPONSE				SMALL-SIGNAL GAIN						LARGE-SIGNAL GAIN
SHUTDOWN RESPONSE					vs. FREQUENCY					vs. FREQUENCY
MAX9914 toc22			10						4
IN+ = VDD / 2			10	AV = 1V/V			toc23		4	AV = 1V/V		toc24
			8				toc23					toc24
	3V						MAX9914		3			MAX9914
AV = 1V/V				VOUT = 100mVP-P						VOUT = 2VP-P
AV = 1V/V				VOUT = 100mVP-P						VOUT = 2VP-P
SHDN = 3V			6	CLOAD = 15pF					2	CLOAD = 15pF
			4						2
	0V		4						1
	0V	(dB)	2					(dB)	1
			2
			0						0
		GAIN	0					GAIN	0
	1.5V	GAIN	-2					GAIN	-1
			-2
			-4
OUTPUT			-4						-2
			-6						-2
	0V		-6						-3
	0V		-8						-3
			-8
20µs/div			-10	10k	100k	1M			-4	10	100
20µs/div			1k	10k	100k	1M	10M		1	10	100	1000
					FREQUENCY (Hz)					FREQUENCY (kHz)

	SMALL-SIGNAL PULSE RESPONSE			SMALL-SIGNAL PULSE RESPONSE
	(CLOAD = 15pF)			(CLOAD = 100pF)
		MAX9914 toc25			MAX9914 toc26

					AV = 10V/V
		AV = 1V/V
IN+			IN+
50mV/div			5mV/div

OUTPUT		OUTPUT
50mV/div		50mV/div

	1µs/div		5µs/div

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Maxim Integrated │ 7

MAX9914–MAX9917	1MHz, 20μA, Rail-to-Rail
	I/O Op Amps with Shutdown

Typical Operating Characteristics (continued)

(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA = +25°C, unless otherwise noted.)

	LARGE-SIGNAL PULSE RESPONSE			LARGE-SIGNAL PULSE RESPONSE
	(CLOAD = 15pF)			(CLOAD = 100pF)
		MAX9914 toc27			MAX9914 toc28

		AV = 1V/V			AV = 10V/V
IN+			IN+
1V/div			100mV/div

OUTPUT		OUTPUT
1V/div		1V/div

	5µs/div		5µs/div

		PERCENT OVERSHOOT					OUTPUT WAVEFORM WITH RISO
		vs. CAPACITIVE LOAD					(CLOAD = 47pF, RISO = 2.3kΩ)
	7					toc29	MAX9914 toc30
	7						AV = 1V/V

						MAX9914
	6					MAX9914	INPUT
(%)	5	RL = 1MΩ					50mV/div
(%)	5	RL = 1MΩ
OVERSHOOT	4				RL = 100kΩ
					RL = 100kΩ

	3				RL = 10kΩ		OUTPUT
					RL = 10kΩ		OUTPUT
	2						50mV/div
	2
	1	20	40	60	80		5µs/div
	0	20	40	60	80	100	5µs/div
			CLOAD (pF)

OUTPUT WAVEFORM WITHOUT RISO

(CLOAD = 47pF)

MAX9914 toc31

AV = 1V/V

IN+

50mV/div

OUTPUT 50mV/div

5µs/div

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Maxim Integrated │ 8

MAX9914–MAX9917						1MHz, 20μA, Rail-to-Rail
					I/O Op Amps with Shutdown
Pin Description

	PIN			NAME		FUNCTION

MAX9914	MAX9915	MAX9916	MAX9917
MAX9914	MAX9915	MAX9916	MAX9917

1	1	—	—	IN+		Noninverting Amplifier Input

2	2	4	4	VSS		Negative Supply Voltage
3	3	—	—	IN-		Inverting Amplifier Input

4	4	—	—	OUT		Amplifier Output

5	6	8	10	VDD		Positive Supply Voltage
—	5	—	—	SHDN		Shutdown
—	—	1	1	OUTA		Amplifier Output Channel A

—	—	2	2	INA-		Inverting Amplifier Input Channel A

—	—	3	3	INA+		Noninverting Amplifier Input Channel A

—	—	—	5	SHDNA		Shutdown Channel A
—	—	—	6	SHDNB		Shutdown Channel B
—	—	5	7	INB+		Noninverting Amplifier Input Channel B

—	—	6	8	INB-		Inverting Amplifier Input Channel B

—	—	7	9	OUTB		Amplifier Output Channel B

Detailed Description

Featuring a maximized ratio of gain bandwidth to supply current, low operating supply voltage, low input bias current, and rail-to-rail inputs and outputs, the MAX9914– MAX9917 are an excellent choice for precision or gen- eral-purpose low-current, low-voltage, battery-powered applications. These CMOS devices consume an ultra-low 20μA (typ) supply current and a 200μV (typ) offset voltage. For additional power conservation, the MAX9914/

MAX9917 feature a lowpower shutdown mode that reduces supply current to 1nA (typ), and puts the amplifiers’ output in a highimpedance state. These devices are unity-gain stable with a 1MHz gain-bandwidth product driving capacitive loads up to 30pF. The capacitive load can be increased to 100pF when the amplifier is configured for a 10V/V gain.

Rail-to-Rail Inputs and Outputs

The MAX9914–MAX9917 amplifiers all have a parallelconnected n- and p-channel differential input stage that allows an input common-mode voltage range that extends 100mV beyond the positive and negative supply rails, with excellent common-mode rejection.

The MAX9914–MAX9917 are capable of driving the output to within 5mV of both supply rails with a 100kΩ load. These devices can drive a 5kΩ load with swings to within 60mV of the rails. Figure 1 shows no clipping at the output voltage swing of the MAX9914–MAX9917 configured as a unity-gain buffer powered from a single 3V supply.

Low Input Bias Current

The MAX9914–MAX9917 feature ultra-low 1pA (typ) input bias current. The variation in the input bias current is minimal with changes in the input voltage due to very high input impedance (in the order of 1GΩ).

Applications Information

Driving Capacitive Loads

The MAX9914–MAX9917 amplifiers are unity-gain stable for loads up to 30pF. However, the capacitive load can be increased to 100pF when the amplifier is configured for a minimum gain of 10V/V.

Applications that require greater capacitive drive capability should use an isolation resistor between the output and the capacitive load (Figure 2). Also, in unity-gain applications with relatively small RL (about 5kΩ), the capacitive load can be increased up to 100pF.

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Maxim Integrated │ 9

MAX9914–MAX9917

Power-Supply Considerations

The MAX9914–MAX9917 are optimized for single 1.8V to 5.5V supply operation. A high amplifier power-supply rejection ratio of 85dB (typ) allows the devices to be powered directly from a battery, simplifying design and extending battery life.

Power-Up Settling Time

The MAX9914–MAX9917 typically require 2μs after pow- er-up. Supply settling time depends on the supply voltage, the value of the bypass capacitor, the output impedance of the incoming supply, and any lead resistance or inductance between components. Op amp settling time depends primarily on the output voltage and is slew-rate limited. Figure 3 shows the MAX991_ in a noninverting voltage follower configuration with the input held at midsupply. The output settles in approximately 3.5μs for VDD

= 3V (see the Typical Operating Characteristics for the Power-Up Settling Time graph).

Shutdown Mode

The MAX9915 and MAX9917 feature active-low shutdown inputs. The MAX9915 and MAX9917 enter shutdown in

2μs (typ) and exit shutdown in 10μs (typ). The amplifiers’ outputs are high impedance in shutdown mode. Drive SHDN low to enter shutdown. Drive SHDN high to enable the amplifier. The MAX9917 dual amplifier features separate shutdown inputs. Shut down both amplifiers for lowest quiescent current.

Power-Supply Bypassing and Layout

Bypass VDD with a 0.1μF capacitor to ground as close to the pin as possible to minimize noise.

Good layout techniques optimize performance by decreasing the amount of stray capacitance and inductance to the op amp’s inputs and outputs. Minimize stray capacitance and inductance, by placing external components close to the IC.

1MHz, 20μA, Rail-to-Rail I/O Op Amps with Shutdown

RAIL-TO-RAIL OUTPUT VOLTAGE RANGE

3V
			IN_
			1V/div
0V
3V
			OUT_
			1V/div
0V
0V	VDD = 3V
	VDD = 3V

		200µs/div

Figure 1. Rail-to-Rail Output Voltage Range

RISO

MAX9914–

MAX9917

AV = RL + RISO

1V/V

Figure 2. Using a Resistor to Isolate a Capacitive Load from the Op Amp

5.5V
0V
IN-	VDD
100kΩ
		OUT
IN+	VSS	MAX991_
	VSS	MAX991_
100kΩ

Figure 3. Power-Up Test Configuration

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Maxim Integrated │ 10

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