Data Sheet

AD5428/AD5440/AD5447

Rev. C | Page 7 of 32

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

R/W

CS

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

DB7

DAC A/B

DGND

AGND

DB0 (LSB)

DB4

DB5

DB6

DB3

DB2

DB1

AD5428

TOP VIEW

(Not to Scale)

Figure 4. Pin Configuration 20-Lead TSSOP (RU-20)

Table 4. AD5428 Pin Function Descriptions

Pin No.

Mnemonic

Description

1

AGND

DAC Ground Pin. This pin should typically be tied to the analog ground of the system, but can be biased to

achieve single-supply operation.

2, 20

DAC Current Outputs.

3, 19

DAC Feedback Resistor Pins. These pins establish voltage output for the DAC by connecting to an external

amplifier output.

4, 18

DAC Reference Voltage Input Terminals.

5

DGND

Digital Ground Pin.

6

DAC A/B

Selects DAC A or DAC B. Low selects DAC A; high selects DAC B.

7 to14

DB7 to DB0

Parallel Data Bits 7 Through 0.

15

CS

Chip Select Input. Active low. Used in conjunction with R/W to load parallel data to the input latch or to read

data from the DAC register.

16

R/W

Read/Write. When low, used in conjunction with CS to load parallel data. When high, used in conjunction

with CS to read back contents of the DAC register.

17

Positive Power Supply Input. This part can be operated from a supply of 2.5 V to 5.5 V.