AD7859 Analog Devices, AD7859 Datasheet - Page 10

• Manufacturer Part Number: AD7859
• Description: 3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit, Parallel Sampling ADCs
• Manufacturer: Analog Devices

Specifications of AD7859

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 200kSPS
• Interface: Byte,Par
• Analog Input Type: SE-Bip,SE-Uni
• Ain Range: (Vref) p-p,Uni (Vref)
• Adc Architecture: SAR
• Pkg Type: LCC,QFP

AD7859/AD7859L
AMODE
*AIN(+) refers to the positive input seen by the AD7859/AD7859L sample-and-
CALMD
0
0
0
0
1
1
1
1
AIN(–) refers to the negative input seen by the AD7859/AD7859L sample-and-
hold circuitry.
hold circuitry.
0
0
0
0
0
1
1
1
1
1
Table IIIa. Channel Selection for AD7859/AD7859L
Differential Sampling (SGL/DIFF = 0)
CALSLT1
0
0
1
1
0
0
1
1
CHSLT
2
0
0
0
0
1
0
0
0
0
1
1
0
0
1
1
x
0
0
1
1
x
0
0
1
0
1
x
0
1
0
1
x
CALSLT0
0
1
0
1
0
1
0
1
AIN(+)*AIN(–)*
AIN1
AIN3
AIN5
AIN7
x
AIN1
AIN3
AIN5
AIN7
x
AIN2
AIN4
AIN6
AIN8
x
AIN2
AIN4
AIN6
AIN8
x
internal gain error and finally the internal offset error are removed. This is the default setting.
system gain error calibration, and finally the system offset error calibration.
Calibration Type
A full internal calibration is initiated. First the internal DAC is calibrated, then the
First the internal gain error is removed, then the internal offset error is removed.
The internal offset error only is calibrated out.
The internal gain error only is calibrated out.
A full system calibration is initiated. First the internal DAC is calibrated, followed by the
First the system gain error is calibrated out, followed by the system offset error.
The system offset error only is removed.
The system gain error only is removed.
Bipolar or
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Not Used
Bipolar
Bipolar
Bipolar
Bipolar
Not Used
Table IV. Calibration Selection
–10–
AMODE
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Table IIIb. Channel Selection for AD7859/AD7859L
Single-Ended Sampling (SGL/DIFF = 1)
CHSLT
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
AIN(+)*AIN(–)*
AIN1
AIN3
AIN5
AIN7
AIN2
AIN4
AIN6
AIN8
AIN1
AIN3
AIN5
AIN7
AIN2
AIN4
AIN6
AIN8
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AIN8
AIN8
AIN8
AIN8
AIN8
AIN8
AIN8
AIN8
Bipolar or
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
Unipolar
REV. A