AD7657 Analog Devices, AD7657 Datasheet - Page 26

• 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
CONVST A,
CONVST B,
CONVST C
BUSY
CS
SCLK
DOUT A,
DOUT B,
DOUT C
ACQUISITION
CONVST A,
CONVST B,
CONVST C
DOUT A
DOUT B
DOUT C
DOUT A
DOUT B
BUSY
SCLK
CS
SCLK
CS
t
1
CONVERSION
t
CONVERT
t
2
t
CONVERT
t
16
DB15
Figure 30. Serial Interface with Three DOUT Lines
Figure 31. Serial Interface with Two DOUT Lines
t
17
Figure 32. Serial Read Operation
V1
V3
DB14
V1
V3
V5
Rev. C | Page 26 of 32
t
19
DB13
16
t
18
V2
V4
ACQUISITION
t
ACQ
t
ACQ
V2
V4
V6
V5
V6
DB1
t
20
32
48
DB0
t
QUIET
t
21
t
QUIET
t
10