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