AD8400/AD8402/AD8403

Rev. E | Page 13 of 32

Table 9. AD8403 Pin Function Descriptions

Pin No.

Mnemonic

Description

1

AGND2

Analog Ground 2.1

2

B2

Terminal B RDAC 2.

3

A2

Terminal A RDAC 2.

4

W2

5

AGND4

Analog Ground 4.1

6

B4

Terminal B RDAC 4.

7

A4

Terminal A RDAC 4.

8

W4

9

DGND

Digital Ground.1

10

SHDN

Active Low Input. Terminal A open circuit. Shutdown controls Variable Resistor 1 through Variable Resistor 4.

11

CS

Chip Select Input, Active Low. When CS returns high, data in the serial input register is decoded,

based on the address bits, and loaded into the target DAC register.

12

SDI

Serial Data Input.

13

SDO

Serial Data Output. Open drain transistor requires a pull-up resistor.

14

CLK

Serial Clock Input, Positive Edge Triggered.

15

RS

16

Positive Power Supply. Specified for operation at both 3 V and 5 V.

17

AGND3

Analog Ground 3.1

18

W3

19

A3

Terminal A RDAC 3.

20

B3

Terminal B RDAC 3.

21

AGND1

Analog Ground 1.1

22

W1

23

A1

Terminal A RDAC 1.

24

B1

Terminal B RDAC 1.