AD7321_15 Datasheet, PDF (26/37 Pages) Analog Devices – 500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC

Data Sheet
AD7321
RANGE REGISTER
The range register is used to select one analog input range per analog input channel and to set the ranges for Channel 0 and Channel 1. It
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, the ZERO
bit to 0, and the register select bit to 1. After the initial write to the range register occurs, each time an analog input is selected, the
AD7321 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).
MSB
16
Write
15
ZERO
14
Register Select
13
VIN0A
12
VIN0B
11 10 9
0
0
VIN1A
8
VIN1B
LSB
7654321
0000000
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.
Rev. B | Page 25 of 36