AD7856 Analog Devices, AD7856 Datasheet - Page 11

• Manufacturer Part Number: AD7856
• Description: 5 V Single-Supply, 8-Channel, 14-Bit, 285 kSPS, Serial Sampling ADC
• Manufacturer: Analog Devices

Specifications of AD7856

• Resolution (bits): 14bit
• # Chan: 8
• Sample Rate: 285kSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: (Vref) p-p,Uni (Vref)
• Adc Architecture: SAR
• Pkg Type: DIP,SOIC,SOP

REV. A
CALMD
0
0
0
0
1
1
1
1
CALSLT1
0
0
1
1
0
0
1
1
SGL/DIFF
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
*AIN(+) refers to the positive input seen by the AD7856 sample and hold circuit.
AIN(–) refers to the negative input seen by the AD7856 sample and hold circuit.
CALSLT0
0
1
0
1
0
1
0
1
CH2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Table IV. Calibration Selection
Table III. Channel Selection
CH1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Calibration Type
A Full Internal Calibration is initiated where the Internal DAC is calibrated
followed by the Internal Gain Error, and finally the Internal Offset Error is
calibrated out. This is the default setting.
Here the Internal Gain Error is calibrated out followed by the Internal Offset
Error calibrated out.
This calibrates out the Internal Offset Error only.
This calibrates out the Internal Gain Error only.
A Full System Calibration is initiated here where first the Internal DAC is
calibrated followed by the System Gain Error, and finally the System Offset
Error is calibrated out.
Here the System Gain Error is calibrated out followed by the System Offset
Error.
This calibrates out the System Offset Error only.
This calibrates out the System Gain Error only.
–11–
CH0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
AIN(+)*
AIN
AIN
AIN
AIN
AIN
AIN
AIN
AIN
AIN
AIN
AIN
AIN
AIN
AIN
AIN
AIN
1
3
5
7
2
4
6
8
1
3
5
7
2
4
6
8
AIN(–)*
AIN
AIN
AIN
AIN
AIN
AIN
AIN
AIN
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
2
4
6
8
1
3
5
7
AD7856