Data Sheet

AD7321

Rev. B | Page 25 of 36

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

LSB

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

Write

ZERO

Register Select

0

0

0

0

0

0

0

0

0

Table 13. Range Selection

Description

0

0

0

1

1

0

1

1