AD7322 Analog Devices, AD7322 Datasheet - Page 24

• Manufacturer Part Number: AD7322
• Description: Software Selectable True Bipolar Input, 2-Channel, 12-Bit Plus Sign ADC
• Manufacturer: Analog Devices

Specifications of AD7322

• Resolution (bits): 13bit
• # Chan: 2
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni,SE-Uni
• Ain Range: Bip (Vref),Bip (Vref) x 2,Bip (Vref) x 4,Bip 10V,Bip 2.5V,Bip 5.0V,Uni (Vref) x 4,Uni 10V
• Adc Architecture: SAR
• Pkg Type: SOP

AD7322
RANGE REGISTER
The range register is used to select one analog input range per
analog input channel. This register is a 6-bit, write-only register
with two dedicated range bits for each of the analog input
channels, Channel 0 and Channel 1. There are four analog input
ranges, ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V. A write to the
range register is selected by setting the write bit to 1 and the
MSB
16
Write
Table 13. Range Selection
V
0
0
1
1
IN
xA
15
Zero
V
0
1
0
1
IN
xB
14
Register Select
Description
This combination selects the ±10 V input range on V
This combination selects the ±5 V input range on V
This combination selects the ±2.5 V input range on V
This combination selects the 0 V to +10 V input range on V
13
V
IN
0A
12
V
IN
0B
Rev. A | Page 24 of 36
11
0
10
0
register select bit to 1. After the initial write to the range register
occurs, each time an analog input is selected, the AD7322
automatically configures the analog input to the appropriate
range, as indicated by the range register. The ±10 V input range
is selected by default on each analog input channel (see Table 13).
9
V
IN
IN
IN
x.
IN
1A
x.
x.
IN
x.
8
V
IN
1B
7
0
6
0
5
0
4
0
3
0
2
0
LSB
1
0