AD7656 Analog Devices, AD7656 Datasheet - Page 28

• 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
CONVST A,
CONVST B,
CONVST C
CONVST A,
CONVST B,
CONVST C
BUSY
CS
DEVICE 1, DOUT A
DEVICE 1, DOUT B
DEVICE 2, DOUT A
DEVICE 2, DOUT B
BUSY
CS
SCLK
DEVICE 1, DOUT A
DEVICE 1, DOUT B
DEVICE 1, DOUT C
DEVICE 2, DOUT A
DEVICE 2, DOUT B
DEVICE 2, DOUT C
SCLK
1
MSB V1
MSB V3
MSB V1
MSB V3
AD7656/AD7657/AD7658
1
MSB V1
MSB V3
MSB V5
MSB V1
MSB V3
MSB V5
2
SCLK
DCEN = 0
DEVICE 2
CONVST
3
2
Figure 35. Daisy-Chain Serial Interface Timing with Three DOUT Lines
Figure 34. Daisy-Chain Serial Interface Timing with Two DOUT Lines
15
3
CS
DOUT A
DOUT B
LSB V1 MSB V2
LSB V3 MSB V4
LSB V1 MSB V2
LSB V3 MSB V4
16
15
17
Figure 33. Daisy-Chain Configuration
LSB V1 MSB V2
LSB V3 MSB V4
LSB V5 MSB V6
LSB V1 MSB V2
LSB V3 MSB V4
LSB V5 MSB V6
16
AD7656/AD7657/AD7658
DCIN A
DCIN B
31
Rev. C | Page 28 of 32
17
LSB V2 MSB V5
LSB V4 MSB V6
LSB V2 MSB V5
LSB V4 MSB V6
SCLK
32
CONVST
DCEN = 1
DEVICE 1
33
CS
31
DOUT A
DOUT B
LSB V2 MSB V1
LSB V4 MSB V3
LSB V6 MSB V5
LSB V2
LSB V4
LSB V6
47
32
LSB V5
LSB V6
LSB V5
LSB V6
48
33
MSB V1
MSB V3
49
CONVERT
DATA IN1
DATA IN2
CS
SCLK
47
DIGITAL HOST
63
LSB V1
LSB V3
LSB V5
LSB V1 MSB V2
LSB V3 MSB V4
48
64
MSB V2
MSB V4
MSB V6
65
49
94
63
95
LSB V2
LSB V4
LSB V6
64
LSB V5
LSB V6
96