AD7657 Analog Devices, AD7657 Datasheet - Page 14

• Manufacturer Part Number: AD7657
• Description: 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar, 14-Bit A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7657

• Resolution (bits): 14bit
• # 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
TYPICAL PERFORMANCE CHARACTERISTICS
–100
–120
–140
–160
–100
–120
–140
–160
–0.5
–1.0
–1.5
–2.0
–20
–40
–60
–80
–20
–40
–60
–80
2.0
1.5
1.0
0.5
0
0
0
0
0
0
AV
V
f
2 × V
INL WCP = 0.64LSB
INL WCN = –0.76LSB
SAMPLE
DD
CC
/V
REF
/DV
Figure 4. AD7656 FFT for ±10 V Range
SS
Figure 5. AD7656 FFT for ±5 V Range
10k
= 250kSPS
CC
= ±12V
RANGE
25
25
Figure 6. AD7656 Typical INL
/V
DRIVE
20k
= +5V
FREQUENCY (kHz)
FREQUENCY (kHz)
50
50
30k
CODE
75
75
V
AV
INTERNAL REFERENCE
±10V RANGE
T
f
f
SNR = +87.33dB
SINAD = +87.251dB
THD = –104.32dB
SFDR = –104.13dB
V
AV
INTERNAL REFERENCE
±5V RANGE
T
f
f
SNR = +86.252dB
SINAD = +86.196dB
THD = –105.11dB
SFDR = –98.189dB
40k
S
IN
S
IN
A
DD
A
DD
= 250kSPS
= 250kSPS
CC
CC
= 50kHz
= 25°C
= 50kHz
= 25°C
/V
/V
/DV
/DV
SS
SS
= ±15V
= ±12V
CC
CC
50k
/V
/V
100
100
DRIVE
DRIVE
60k 65535
= +5V
= +5V
125
125
Rev. C | Page 14 of 32
–0.5
–1.0
–1.5
–2.0
–0.4
–0.8
–1.2
–1.6
–2.0
–0.4
–0.8
–1.2
–1.6
–2.0
2.0
1.5
1.0
0.5
2.0
1.6
1.2
0.8
0.4
2.0
1.6
1.2
0.8
0.4
0
0
0
0
0
0
AV
V
f
2 × V
DNL WCP = 0.81LSB
DNL WCN = –0.57LSB
AV
V
SAMPLE
DD
DD
CC
CC
/V
/V
2000
2000
REF
/DV
/DV
SS
SS
10k
= 250kSPS
CC
= ±12V
= ±12V
RANGE
CC
Figure 7. AD7656 Typical DNL
Figure 9. AD7657 Typical DNL
Figure 8. AD7657 Typical INL
/V
/V
4000
4000
DRIVE
DRIVE
20k
= +5V
= +5V
6000
6000
30k
CODE
CODE
CODE
8000
8000
10000 12000 14000 16383
10000 12000 14000 16383
40k
AV
V
f
2 × V
SAMPLE
DD
CC
/V
REF
/DV
SS
= ±12V
= 250kSPS
CC
RANGE
50k
/V
DRIVE
60k 65535
= +5V