Datasheet

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 Wiper RDAC 2, Addr = 01
2
.
5 AGND4 Analog Ground 4.
1
6 B4 Terminal B RDAC 4.
7 A4 Terminal A RDAC 4.
8 W4 Wiper RDAC 4, Addr = 11
2
.
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
Active Low Reset to Midscale. Sets RDAC registers to 80
H
.
16 V
DD
Positive Power Supply. Specified for operation at both 3 V and 5 V.
17 AGND3 Analog Ground 3.
1
18 W3 Wiper RDAC 3, Addr = 10
2
.
19 A3 Terminal A RDAC 3.
20 B3 Terminal B RDAC 3.
21 AGND1 Analog Ground 1.
1
22 W1 Wiper RDAC 1, Addr = 00
2
.
23 A1 Terminal A RDAC 1.
24 B1 Terminal B RDAC 1.
1
All AGND pins must be connected to DGND.