ADS8322
SBAS215A –JULY 2001–REVISED JANUARY 2010 www.ti.com
TIMING INFORMATION
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t1 |
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t3 |
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t2 |
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CLOCK |
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Acquisition |
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Conversion |
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Acquisition |
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tCONV |
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tACQ |
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t5 |
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t4 |
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CONVST |
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t6 |
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t9 |
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t10 |
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BUSY |
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t7 |
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t11 |
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BYTE |
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t8 |
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t12 |
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CS |
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t13 |
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t14 |
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t18 |
RD |
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t15 |
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t16 |
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t17 |
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t19 |
DB15-D8 |
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Bits 15-8 |
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Bits 15-8 |
FF |
DB7-D0 |
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Bits 7-0 |
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Bits 7-0 |
Bits 15-8 |
TIMING CHARACTERISTICS(1) (2)
All specifications typical at –40°C to +85°C, +VD = +5V.
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ADS8322 |
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PARAMETER |
TEST CONDITIONS |
MIN |
TYP |
MAX |
UNIT |
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tCONV |
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Conversion Time |
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1.6 |
μs |
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tAQC |
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Acquisition Time |
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350 |
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t1 |
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CLOCK Period |
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100 |
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t2 |
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CLOCK High Time |
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t3 |
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CLOCK Low Time |
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ns |
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t4 |
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Low to Clock High |
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ns |
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CONVST |
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t5 |
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CLOCK High to |
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High |
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ns |
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CONVST |
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t6 |
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Low Time |
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ns |
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CONVST |
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t7 |
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Low to BUSY High |
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ns |
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CONVST |
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t8 |
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Low to |
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Low |
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CONVST |
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t9 |
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High |
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20 |
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CONVST |
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t10 |
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CLOCK Low to |
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Low |
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CONVST |
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t11 |
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CLOCK High to BUSY Low |
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25 |
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t12 |
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High |
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CS |
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t13 |
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Low to |
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Low |
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CS |
RD |
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t14 |
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High to |
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High |
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RD |
CS |
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t15 |
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Low Time |
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RD |
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t16 |
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Low to Data Valid |
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40 |
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RD |
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t17 |
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Data Hold from |
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High |
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5 |
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RD |
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t18 |
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BYTE Change to |
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Low(3) |
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0 |
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RD |
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t19 |
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High Time |
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20 |
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RD |
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(1)All input signals are specified with tR = tF = 5ns (10% to 90% of VDD) and timed from a voltage level of (VIL + VIH) /2.
(2)See timing diagram, above.
(3)BYTE is asynchronous; when BYTE is 0, bits 15 through 0 appear at DB15-DB0. When BUSY is 1, bits 15 through 8 appear on DB7-DB0. RD may remain low between changes in BYTE.
6 |
Submit Documentation Feedback |
Copyright © 2001–2010, Texas Instruments Incorporated |
Product Folder Link(s): ADS8322
ADS8322
www.ti.com |
SBAS215A –JULY 2001–REVISED JANUARY 2010 |
TYPICAL CHARACTERISTICS
At –40°C to +85°C, +VA = +5V, VREF = +2.5V, fSAMPLE = 500kHz, and fCLK = 20 • fSAMPLE, unless otherwise specified.
FREQUENCY SPECTRUM
(4096 Point FFT; fIN = 100.1kHz, –0.2dB)
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0 |
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−30 |
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Amplitude(dB) |
−60 |
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−90 |
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−120 |
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−150 |
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120 |
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Frequency (Hz) |
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SIGNAL-TO-NOISE RATIO AND SIGNAL-TO-NOISE + DISTORTION vs INPUT FREQUENCY
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85 |
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SNR |
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SNR,SINAD |
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80 |
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SINAD |
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75 |
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Frequency (kHz)
Figure 1. |
Figure 2. |
SPURIOUS FREE DYNAMIC RANGE AND
TOTAL HARMONIC DISTORTIONvs INPUT FREQUENCY
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SFDR |
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SFDR |
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(dB)THD |
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THD |
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80 |
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−80 |
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75 |
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−75 |
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Frequency (kHz) |
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Figure 3. |
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IL– vs TEMPERATURE |
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0.2 |
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Deltas(LSB) |
0 |
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−0.2 |
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−0.4 |
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−0.6 |
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−–40 −20 |
0 |
20 |
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80 100 |
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Temperature (°C)
IL+ vs TEMPERATURE
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Deltas(LSB) |
0.20 |
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−40 |
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Temperature (°C)
Figure 4.
DL+ vs TEMPERATURE
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Deltas(LSB) |
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−1.5 |
−40 |
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Temperature (°C)
Figure 5. |
Figure 6. |
Copyright © 2001–2010, Texas Instruments Incorporated |
Submit Documentation Feedback |
7 |
Product Folder Link(s): ADS8322
ADS8322
SBAS215A –JULY 2001–REVISED JANUARY 2010 |
www.ti.com |
TYPICAL CHARACTERISTICS (continued)
At –40°C to +85°C, +VA = +5V, VREF = +2.5V, fSAMPLE = 500kHz, and fCLK = 20 • fSAMPLE, unless otherwise specified.
Deltas(LSB)
DL– vs TEMPERATURE
0.05
0
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Temperature (°C)
Deltas(LSB)
OFFSET ERROR vs TEMPERATURE
2.5
2.0
1.5
1.0
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Temperature (°C)
Figure 7. |
Figure 8. |
Deltas(LSB)
GAIN ERROR vs TEMPERATURE
8
6
4
2
0
−2
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Temperature (°C)
Deltas(mV)
VREF vs TEMPERATURE
2.0 |
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1.0 |
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−1.0 |
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−2.0 |
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−3.0 |
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−4.0 |
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−5.0 |
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−6.0 |
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−8.0 |
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−20 |
0 |
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Temperature (°C)
Figure 9. |
Figure 10. |
Deltas(mA)
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LINEARITY ERROR AND |
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IQ vs TEMPERATURE |
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DIFFERENTIAL LINEARITY ERROR vs CODE |
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1.2 |
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4 |
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INL(LSB) |
3 |
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2 |
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0.8 |
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1 |
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0 |
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−1 |
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−2 |
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0.4 |
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−3 |
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−4 |
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2.5 |
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DNL(LSB) |
2.0 |
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−0.5 |
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1.5 |
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1.0 |
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−0.4 |
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0.5 |
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0 |
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−1.0 |
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−0.8 |
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−1.5 |
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−40 −20 |
0 |
20 |
40 |
60 |
80 |
100 |
0000H 2000H 4000H 6000H 8000H A000H C000H E000H FFFFH |
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Temperature (°C) |
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DECIMAL CODE |
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Figure 11. |
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Figure 12. |
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8 |
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