Datasheet

AD7656-1/AD7657-1/AD7658-1 Data Sheet
Rev. D | Page 16 of 32
–55 125
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
–35 –15 5 25 45 65 85 105
2.492
2.494
2.496
2.498
2.500
2.502
2.504
2.506
2.508
2.510
AV
CC
/DV
CC
/V
DRIVE
= 5V
V
DD
/V
SS
= ±12V
07017-016
Figure 16. Reference Voltage vs. Temperature
3.20
2.70
–55 125
TEMPERATURE (°C)
CONVERSION TIME (µs)
3.15
3.10
3.05
3.00
2.95
2.90
2.85
2.80
2.75
–35 –15 5 25 45
65 85 105
AV
CC
/DV
CC
/V
DRIVE
= 5V
V
DD
/V
SS
= ±12V
07017-017
Figure 17. Conversion Time vs. Temperature
3500
–5
CODE
NUMBER OF OCCURRENCES
3
3000
2500
2000
1500
1000
500
–4 –3 –2 –1 0 1 2
V
DD
/V
SS
= ±15V
AV
CC
/DV
CC
/V
DRIVE
= 5V
INTERNAL REFERENCE
8192 SAMPLES
25
168
1532
3212
2806
392
57
00
0
07017-018
Figure 18. AD7656-1 Histogram of Codes
100
40
30 530
SUPPLY RIPPLE FREQUENCY (kHz)
PSRR (dB)
90
80
70
60
50
80 130 180 230 280 330 380 430
480
V
DD
V
SS
f
SAMPLE
= 250kSPS
±2 × V
REF
RANGE
INTERNAL REFERENCE
T
A
= 25°C
f
IN
= 10kHz
100nF ON V
DD
AND V
SS
07017-019
Figure 19. PSRR vs. Supply Ripple Frequency
90
85
–40 140
07017-020
TEMPERATURE (°C)
SNR (dB)
89
88
87
86
–20 0 20 40 60 80 100 120
±10V RANGE
AV
CC
/DV
CC
/V
DRIVE
= 5.25V
V
DD
/V
SS
= ±16.5V
±5V RANGE
AV
CC
/DV
CC
/V
DRIVE
= 5V
V
DD
/V
SS
= ±12V
f
SAMPLE
= 250kSPS
f
IN
= 10kHz
INTERNAL REFERENCE
Figure 20. AD7656-1 SNR vs. Temperature
–90
–120
–60 140
07017-021
TEMPERATURE (°C)
THD (dB)
–95
–100
–105
–110
–115
–40 –20 0 4020 60 80 100 120
±10V RANGE
AV
CC
/DV
CC
/V
DRIVE
= 5.25V
V
DD
/V
SS
= ±16.5V
±5V RANGE
AV
CC
/DV
CC
/V
DRIVE
= 5V
V
DD
/V
SS
= ±12V
f
SAMPLE
= 250kSPS
f
IN
= 10kHz
INTERNAL REFERENCE
Figure 21. AD7656-1 THD vs. Temperature