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AD7985 Datasheet(PDF) 10 Page - Analog Devices

Part # AD7985
Description  16-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7985 Datasheet(HTML) 10 Page - Analog Devices

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AD7985
Rev. 0 | Page 10 of 28
0
–180
–160
–140
–120
–100
–80
–60
–40
–20
01250
fS = 2.5MSPS
fIN = 20kHz
SNR = 89.87dB
THD = –102.76dB
SINAD = 89.66dB
1000
750
500
250
FREQUENCY (kHz)
Figure 11. FFT Plot (External Reference)
100
95
90
85
80
16
15
14
13
12
2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00
REFERENCE VOLTAGE (V)
SNR
SINAD
ENOB
Figure 12. SNR, SINAD, and ENOB vs. Reference Voltage
95
90
85
80
75
70
65
11000
100
10
FREQUENCY (kHz)
Figure 13. SINAD vs. Frequency
0
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
1250
1000
750
500
250
FREQUENCY (kHz)
fS = 2.5MSPS
fIN = 20kHz
SNR = 88.45dB
THD = –103.42dB
SINAD = 88.32dB
Figure 14. FFT Plot (Internal Reference)
–90
–95
–100
–105
–110
100
95
90
85
80
2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00
REFERENCE VOLTAGE (V)
SFDR
THD
Figure 15. THD and SFDR vs. Reference Voltage
–85
–90
–95
–100
–105
–110
11
100
10
FREQUENCY (kHz)
000
Figure 16. THD vs. Frequency



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