AD7656 Analog Devices, AD7656 Datasheet - Page 16

• Manufacturer Part Number: AD7656
• Description: 250 kSPS, 6-Channel, Simultaneous Sampling Bipolar 16-Bit ADC
• Manufacturer: Analog Devices

Specifications of AD7656

• Resolution (bits): 16bit
• # Chan: 6
• Sample Rate: 250kSPS
• Interface: Par,Ser,SPI
• Analog Input Type: SE-Bip
• Ain Range: Bip (Vref) x 2,Bip (Vref) x 4,Bip 10V,Bip 5.0V
• Adc Architecture: SAR
• Pkg Type: QFP

AD7656/AD7657/AD7658
2.510
2.508
2.506
2.504
2.502
2.500
2.498
2.496
2.494
2.492
3500
3000
2500
2000
1500
1000
3.20
3.15
3.10
3.05
3.00
2.95
2.90
2.85
2.80
2.75
2.70
500
0
–55
–55
–5
0
AV
V
DD
Figure 16. Reference Voltage vs. Temperature
Figure 17. Conversion Time vs. Temperature
CC
/V
–35
–35
Figure 18. AD7656 Histogram of Codes
/DV
57
–4
SS
CC
= ±12V
–15
–15
/V
392
–3
DRIVE
5
5
= +5V
2806
TEMPERATURE (°C)
TEMPERATURE (°C)
–2
25
25
CODE
3212
–1
45
45
AV
V
V
AV
INTERNAL REFERENCE
8192 SAMPLES
1532
DD
DD
0
CC
CC
65
/V
65
/V
/DV
/DV
SS
SS
168
CC
= ±12V
= ±15V
CC
1
85
85
/V
/V
DRIVE
DRIVE
25
105
105
2
= +5V
= +5V
125
125
3
0
Rev. C | Page 16 of 32
–100
–101
–102
–103
–104
–105
–106
–107
87.0
86.5
86.0
85.5
85.0
84.5
84.0
83.5
83.0
100
90
80
70
60
50
40
–40
–40
30
f
f
INTERNAL REFERENCE
±5V RANGE,
AV
V
f
f
INTERNAL REFERENCE
SAMPLE
IN
SAMPLE
IN
DD
Figure 19. PSRR vs. Supply Ripple Frequency
= 50kHz
CC
= 50kHz
80
–20
–20
/V
Figure 21. AD7656 THD vs. Temperature
Figure 20. AD7656 SNR vs. Temperature
/DV
SS
= 250kSPS
= 250kSPS
CC
= ±12V
130
/V
0
0
SUPPLY RIPPLE FREQUENCY (kHz)
DRIVE
V
±5V RANGE,
AV
180
DD
CC
20
/V
20
= +5V
TEMPERATURE (°C)
/DV
TEMPERATURE (°C)
SS
230
= ±12V
CC
40
40
/V
±10V RANGE,
AV
V
DRIVE
280
DD
±10V RANGE,
AV
V
CC
/V
DD
60
60
CC
/DV
SS
= +5V
/V
330
/DV
SS
f
±2 × V
INTERNAL REFERENCE
T
f
100nF ON V
= ±16.5V
CC
SAMPLE
IN
V
A
DD
80
CC
= ±16.5V
80
= 10kHz
/V
= 25°C
380
DRIVE
/V
REF
V
DRIVE
= 250kSPS
SS
100
100
RANGE
430
= +5.25V
DD
= +5.25V
AND V
120
120
480
SS
530
140
140