ADS8326
www.ti.com |
SBAS343C –MAY 2007–REVISED SEPTEMBER 2009 |
TYPICAL CHARACTERISTICS: VDD = +2.7V
ILE(LSB)
At TA = +25°C, VDD = +2.7V, VREF = +2.5V. fSAMPLE = 200kHz, fCLK = 24 × fSAMPLE, unless otherwise noted.
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INTEGRAL LINEARITY ERROR |
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DIFFERENTIAL LINEARITY ERROR |
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vs |
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vs |
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CODE |
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CODE |
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3 |
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3 |
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2 |
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1 |
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DLE(LSB) |
1 |
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0 |
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−1 |
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−1 |
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−2 |
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−2 |
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−3 |
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−3 |
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0000h |
4000h |
8000h |
C000h |
FFFFh |
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0000h |
4000h |
8000h |
C000h |
FFFFh |
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Output Code |
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Output Code |
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Figure 21. |
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Figure 22. |
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CHANGE IN OFFSET |
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vs |
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TEMPERATURE |
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0.50 |
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0.25 |
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°C(LSB) |
0 |
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+25 |
−0.25 |
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Deltafrom |
−0.50 |
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−0.75 |
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−1.00 |
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−50 |
−25 |
0 |
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100 |
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Temperature (°C) |
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Figure 23.
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CHANGE IN GAIN |
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vs |
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TEMPERATURE |
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0.50 |
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0.25 |
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°C(LSB) |
0 |
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+25 |
−0.25 |
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Deltafrom |
−0.50 |
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−0.75 |
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−1.00 |
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−50 |
−25 |
0 |
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75 |
100 |
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Temperature (°C) |
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Figure 24.
Copyright © 2007–2009, Texas Instruments Incorporated |
Submit Documentation Feedback |
15 |
Product Folder Link(s): ADS8326
ADS8326
SBAS343C –MAY 2007 –REVISED SEPTEMBER 2009 |
www.ti.com |
TYPICAL CHARACTERISTICS: VDD = +2.7V (continued)
At TA = +25°C, VDD = +2.7V, VREF = +2.5V. fSAMPLE = 200kHz, fCLK = 24 × fSAMPLE, unless otherwise noted.
CHANGE IN OFFSET vs
COMMON-MODE VOLTAGE
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(LSB) |
25 |
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20 |
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=0V |
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15 |
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CM |
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V |
10 |
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TO |
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RELATIVE |
5 |
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0 |
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DELTA |
−5 |
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−10 |
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−0.5 −0.4 −0.3 −0.2 −0.1 |
0 |
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0.3 |
0.4 |
0.5 |
0.6 |
VCM (V)
Figure 25.
FREQUENCY SPECTRUM
(8192 point FFT, fIN = 1.9775kHz, –0.2dB)
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Amplitude(dB) |
−40 |
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−60 |
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−80 |
−100
−120
−140
−160
0 |
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Frequency (kHz)
CHANGE IN GAIN vs
COMMON-MODE VOLTAGE
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(LSB) |
25 |
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20 |
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=0V |
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15 |
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CM |
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V |
10 |
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TO |
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RELATIVE |
5 |
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0 |
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DELTA |
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−10 |
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−0.5 −0.4 −0.3 −0.2 −0.1 |
0 |
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0.4 |
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0.6 |
VCM (V)
Figure 26.
FREQUENCY SPECTRUM
(8192 point FFT, fIN = 9.9854kHz, –0.2dB)
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Amplitude(dB) |
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−60 |
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−80 |
−100
−120
−140
−160
0 |
10 |
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30 |
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70 |
80 |
90 |
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Frequency (kHz)
Figure 27. |
Figure 28. |
16 |
Submit Documentation Feedback |
Copyright © 2007–2009, Texas Instruments Incorporated |
Product Folder Link(s): ADS8326
ADS8326
www.ti.com |
SBAS343C –MAY 2007–REVISED SEPTEMBER 2009 |
TYPICAL CHARACTERISTICS: VDD = +2.7V (continued)
At TA = +25°C, VDD = +2.7V, VREF = +2.5V. fSAMPLE = 200kHz, fCLK = 24 × fSAMPLE, unless otherwise noted.
SNRandSINAD(dB)
SIGNAL-TO-NOISE AND |
SPURIOUS-FREE DYNAMIC RANGE AND |
SIGNAL-TO-NOISE + DISTORTION |
TOTAL HARMONIC DISTORTION |
vs |
vs |
INPUT FREQUENCY |
INPUT FREQUENCY |
95 |
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100 |
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−100 |
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SNR |
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95 |
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−95 |
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85 |
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90 |
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−90 |
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85 |
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−85 |
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80 |
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SFDR |
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80 |
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−80 |
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65 |
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SFDR(dB) |
THD(1) |
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THD(dB) |
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75 |
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75 |
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−75 |
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70 |
SINAD |
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70 |
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−70 |
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65 |
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−65 |
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60 |
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60 |
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−60 |
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55 |
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55 |
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−55 |
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−50 |
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50 |
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−45 |
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NOTE: (1) First nine harmonics of the input frequency. |
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40 |
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Frequency (kHz) |
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Frequency (kHz) |
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Figure 29.
EFFECTIVE NUMBER OF BITS vs
INPUT FREQUENCY
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14 |
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13 |
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ENOB(Bits) |
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11 |
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10 |
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9 |
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Frequency (kHz)
Figure 31.
Figure 30.
CHANGE IN SIGNAL-TO-NOISE + DISTORTION vs
TEMPERATURE
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fIN = 1.97754kHz, −0.2dB |
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0.2 |
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°C(dB) |
0 |
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+25 |
−0.2 |
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Deltafrom |
−0.4 |
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−0.6 |
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−0.8 |
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−50 |
−25 |
0 |
25 |
50 |
75 |
100 |
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Temperature (°C) |
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Figure 32.
Copyright © 2007–2009, Texas Instruments Incorporated |
Submit Documentation Feedback |
17 |
Product Folder Link(s): ADS8326
ADS8326
SBAS343C –MAY 2007 –REVISED SEPTEMBER 2009 |
www.ti.com |
TYPICAL CHARACTERISTICS: VDD = +2.7V (continued)
At TA = +25°C, VDD = +2.7V, VREF = +2.5V. fSAMPLE = 200kHz, fCLK = 24 × fSAMPLE, unless otherwise noted.
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SIGNAL-TO-NOISE + DISTORTION |
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vs |
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INPUT LEVEL |
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100 |
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fIN = 1.97754kHz, −0.2dB |
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90 |
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80 |
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SupplyCurrent(mA) |
SINAD(dB) |
70 |
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60 |
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50 |
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40 |
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30 |
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20 |
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10 |
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−80 |
−70 |
−60 |
−50 −40 −30 |
−20 |
−10 |
0 |
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Input Level (dB) |
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SUPPLY CURRENT vs TEMPERATURE
1.38
1.37
1.36
1.35
1.34
1.33
1.32
1.31
1.30
−50 |
−25 |
0 |
25 |
50 |
75 |
100 |
Temperature (°C)
Figure 33. |
Figure 34. |
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SUPPLY CURRENT |
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SAMPLING RATE |
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10 |
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1 |
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(mA) |
0.1 |
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SupplyCurrent |
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0.01 |
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0.001 |
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0.0001 |
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1 |
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Sampling Rate (kHz)
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REFERENCE CURRENT |
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vs |
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SAMPLING RATE |
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1000 |
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A) |
100 |
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( |
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ReferenceCurrent |
10 |
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1 |
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0.1 |
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1 |
10 |
100 |
200 |
Sampling Rate (kHz)
Figure 35. |
Figure 36. |
OUTPUT CODE HISTOGRAM FOR A DC INPUT
(8192 Conversions)
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4791 |
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OCCURRENCE |
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1665 |
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1643 |
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0 |
53 |
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40 |
0 |
7FFC |
7FFD |
7FFE |
7FFF |
8000 |
8001 |
8002 |
CODE
Figure 37.
18 |
Submit Documentation Feedback |
Copyright © 2007–2009, Texas Instruments Incorporated |
Product Folder Link(s): ADS8326