AD7323 Analog Devices, AD7323 Datasheet - Page 25

• Manufacturer Part Number: AD7323
• Description: 500 kSPS, 4-Channel, Software Selectable True bipolar Input, 12-Bit Plus Sign A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7323

• Resolution (bits): 13bit
• # Chan: 4
• Sample Rate: 500kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: Bip 10V,Bip 2.5V,Bip 5.0V,Uni 10V
• Adc Architecture: SAR
• Pkg Type: SOP

SEQUENCE REGISTER
The sequence register on the AD7323 is a 4-bit, write-only register.
Each of the four analog input channels has one corresponding
bit in the sequence register. To select a channel for inclusion in
the sequence, set the corresponding channel bit to 1 in the
sequence register.
RANGE REGISTER
The range register is used to select one analog input range per
analog input channel. It is an 8-bit, write-only register with two
MSB
16
Write
MSB
16
Write
Table 13. Range Selection
V
0
0
1
1
IN
xA
15
Register Select 1
15
Register Select 1
V
0
1
0
1
IN
xB
14
Register Select 2
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
14
Register Select 2
13
V
IN
13
V
0A
IN
0
12
V
IN
12
V
0B
Rev. A | Page 25 of 36
IN
1
11
V
IN
11
V
1A
IN
2
dedicated range bits for each of the analog input channels from
Channel 0 to Channel 3. 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 register
select bits to 0 and 1. After the initial write to the range register
occurs, each time an analog input is selected, the AD7323
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).
10
V
10
V
IN
IN
1B
3
IN
IN
x.
IN
x.
x.
9
V
9
0
IN
2A
IN
x.
8
V
8
0
IN
2B
7
0
7
V
IN
3A
6
0
6
V
IN
3B
5
0
5
0
4
0
4
0
3
0
3
0
AD7323
2
0
2
0
LSB
1
0
LSB
1
0