EVAL-AD7327CB AD [Analog Devices], EVAL-AD7327CB Datasheet - Page 25

• Manufacturer Part Number: EVAL-AD7327CB
• Description: 500 kSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
• Manufacturer: AD [Analog Devices]

SEQUENCE REGISTER
The sequence register on the AD7327 is an 8-bit, write-only register. Each of the eight analog input channels has one corresponding bit in
the sequence register. To select an analog input channel for inclusion in the sequence, set the corresponding channel bit to 1 in the
sequence register.
MSB
16
Write
RANGE REGISTERS
The range registers are used to select one analog input range per analog input channel. Range Register 1 is used to set the ranges for
Channel 0 to Channel 3. It is an 8-bit, write-only register with two 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 Range Register 1 is selected
by setting the write bit to 1 and the register select bits to 0 and 1. After the initial write to Range Register 1 occurs, each time an analog
input is selected, the AD7327 automatically configures the analog input to the appropriate range, as indicated by Range Register 1.
The ±10 V input range is selected by default on each analog input channel (see Table 13).
MSB
16
Write
Range Register 2 is used to set the ranges for Channel 4 to Channel 7. It is an 8-bit, write-only register with two dedicated range bits for
each of the analog input channels from Channel 4 to Channel 7. There are four analog input ranges, ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V.
After the initial write to Range Register 2 occurs, each time an analog input is selected, the AD7327 automatically configures the analog
input to the appropriate range, as indicated by Range Register 2. The ±10 V input range is selected by default on each analog input
channel (see Table 13).
MSB
16
Write
Table 13. Range Selection
V
0
0
1
1
IN
xA
15
Register
Select 1
15
Register
Select 1
15
Register Select 1
V
0
1
0
1
IN
xB
14
Register
Select 2
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
13
V
IN
IN
0A
4A
12
V
12
V
13
V
IN
IN
IN
0B
4B
0
12
V
11
V
11
V
Rev. 0 | Page 25 of 36
IN
IN
IN
1
1A
5A
11
V
IN
10
V
10
V
2
IN
IN
1B
5B
10
V
IN
3
9
V
9
V
IN
IN
IN
IN
x.
IN
2A
6A
x.
x.
9
V
IN
4
IN
x.
8
V
8
V
IN
IN
2B
6B
8
V
IN
5
7
V
7
V
IN
IN
7
V
3A
7A
IN
6
6
V
6
V
6
V
IN
IN
IN
3B
7B
7
5
0
5
0
5
0
4
0
4
0
4
0
3
0
3
0
3
0
AD7327
2
0
2
0
2
0
LSB
1
0
LSB
1
0
LSB
1
0