AD7538

Rev. B | Page 7 of 16

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

24

23

WR

22

CS

21

LDAC

20

DB0 (LSB)

19

DB1

18

DB2

17

DB3

16

DB4

15

DB5

14

DB6

13

AD7538

TOP VIEW

(Not to Scale)

Figure 3. Pin Configuration

Table 5. Pin Function Description

Pin No.

Mnemonic

Description

1

Voltage Reference.

2

Feedback Resistor. Used to close the loop around an external op amp.

3

Current Output Terminal.

4

AGND

Analog Ground

5

DGND

Digital Ground.

6 to 19

DB13 to DB0

Data Inputs. Bit DB13 (MSB) to Bit DB0 (LSB).

20

LDAC

Chip Select Input. Active low.

21

CS

Asynchronous Load DAC Input. Active low.

22

WR

Write Input. Active low.

CS

LDAC

WR

Operation

0

1

0

Load input register.

1

0

X1

Load DAC register from input register.

0

0

0

Input and DAC registers are transparent.

1

1

X1

No operation.

X

X

1

1

1

No operation.

23

+12 V to +15 V Supply Input.

24

Bias pin for high temperature low leakage configuration. To implement low leakage system, the pin should be

at a negative voltage. See Figure 6 and Figure 8 for recommended circuitry.