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AD7327 Datasheet(PDF) 25 Page - Analog Devices

Part No. AD7327
Description  500 kSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
Download  36 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7327 Datasheet(HTML) 25 Page - Analog Devices

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AD7327
Rev. 0 | Page 25 of 36
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
LSB
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Write
Register Select 1
Register Select 2
VIN0
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
0
0
0
0
0
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
LSB
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Write
Register
Select 1
Register
Select 2
VIN0A
VIN0B
VIN1A
VIN1B
VIN2A
VIN2B
VIN3A
VIN3B
0
0
0
0
0
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
LSB
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Write
Register
Select 1
Register
Select 2
VIN4A
VIN4B
VIN5A
VIN5B
VIN6A
VIN6B
VIN7A
VIN7B
0
0
0
0
0
Table 13. Range Selection
VINxA
VINxB
Description
0
0
This combination selects the ±10 V input range on VINx.
0
1
This combination selects the ±5 V input range on VINx.
1
0
This combination selects the ±2.5 V input range on VINx.
1
1
This combination selects the 0 V to +10 V input range on VINx.


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