Data Sheet
AD7656-1/AD7657-1/AD7658-1
1.0
–80
–85
V
/V = ±12V
DD SS
fSAMPLE = 250kSPS
AV /DV /V
fSAMPLE = 250kSPS
±5V RANGE
= 5V
CC
CC DRIVE
0.8
0.6
T = 25°C
A
INTERNAL REFERENCE
–90
0.4
0.2
–95
0
±10V RANGE
/V = ±12V
V
DD SS
–100
–105
–110
–115
–0.2
–0.4
–0.6
–0.8
–1.0
AV /DV /V
= 5V
CC CC DRIVE
±5V RANGE
/V = ±12V
V
DD SS
AV /DV /V
= 5V
CC CC DRIVE
0
500
1000 1500 2000 2500 3000 3500 4000
CODE
10
100
ANALOG INPUT FREQUENCY (kHz)
Figure 10. AD7658-1 Typical INL
Figure 13. AD7656-1 THD vs. Analog Input Frequency
1.0
0.8
–80
–90
V
/V = ±12V
DD SS
V
/V = ±16.5V
DD SS
AV /DV /V
fSAMPLE = 250kSPS
±5V RANGE
= 5V
AV /DV /V
= 5.25V
CC
CC DRIVE
CC
CC DRIVE
T
= 25°C
R
= 1000Ω
A
SOURCE
INTERNAL REFERENCE
±4 × V RANGE
0.6
REF
0.4
0.2
R
= 220Ω
SOURCE
0
–100
–110
–120
R
= 50Ω
SOURCE
–0.2
–0.4
–0.6
–0.8
–1.0
R
= 100Ω
SOURCE
R
= 10Ω
SOURCE
0
500
1000 1500 2000 2500 3000 3500 4000
CODE
10
100
ANALOG INPUT FREQUENCY (kHz)
Figure 11. AD7658-1 Typical DNL
Figure 14. AD7656-1 THD vs. Analog Input Frequency for Various Source
Impedances, 4 × VREF Range
90
89
88
87
86
85
84
83
–80
V
/V = ±12V
fSAMPLE = 250kSPS
= 25°C
INTERNAL REFERENCE
DD SS
AV /DV /V
= 5V
T
CC
CC DRIVE
A
T
= 25°C
±10V RANGE
/V = ±12V
–85
–90
A
INTERNAL REFERENCE
±2 × V
V
DD SS
RANGE
AV /DV /V
= 5V
REF
CC CC DRIVE
R
= 1000Ω
–95
±5V RANGE
SOURCE
V
/V = ±12V
DD SS
AV /DV /V
= 5V
CC CC DRIVE
–100
–105
–110
–115
R
= 220Ω
R
= 100Ω
SOURCE
SOURCE
R
= 50Ω
SOURCE
R
= 10Ω
SOURCE
10
100
10
100
ANALOG INPUT FREQUENCY (kHz)
ANALOG INPUT FREQUENCY (kHz)
Figure 12. AD7656-1 SINAD vs. Analog Input Frequency
Figure 15. AD7656-1 THD vs. Analog Input Frequency for Various Source
Impedances, 2 × VREF Range
Rev. D | Page 15 of 32
ROCHESTER [ Rochester Electronics ]
