Preliminary Technical Data

AD5757/AD5737

Rev. PrD | Page 11 of 31

Pin No. Mnemonic

Description

more information. When CLEAR is active, the DAC register cannot be written to.

15

ALERT

Active High Output. This pin is asserted when there has been no SPI activity on the interface pins for a

predetermined time. See features section for more information.

16

FAULT

Active Low Output. This pin is asserted low when an open circuit in current mode is detected or a short

circuit in voltage mode is detected or a PEC error is detected or an over temperature is detected (see

Features section). Open Drain Output.

17

DGND

Digital Ground Pin.

18

RESET

Hardware Reset. Active Low Input.

19

Positive Analog Supply Pin. Voltage ranges from 10.8 V to 33 V.

20

N/C

No Connection. Do not connect to this pin.

21

CHARTA

Hart Input Connection for DAC Channel A

22

IGATEA

Optional connection for external pass transistor. Not required when using DC-DC. Should be left unconnected.

23

DC-DC Compensation Capacitor. Connect a 10 nF capacitor from this pin to ground. Used to regulate the

feedback loop of channel A’s DC-DC converter.

24

Supply for channel A’s current output stage (See Figure 14). To use the DC-DC feature of the device,

connect as shown in Figure 20.

25

N/C

No Connection. Do not connect to this pin.

26

Current Output Pin for DAC Channel A.

27

Negative Analog Supply Pin. This Can be connected to AGND.

28

N/C

No Connection. Do not connect to this pin.

29

CHARTB

Hart Input Connection for DAC Channel B

30

N/C

No Connection. Do not connect to this pin.

31

IGATEB

Optional connection for external pass transistor. Not required when using DC-DC. Should be left unconnected.

32

DC-DC Compensation Capacitor. Connect a 10 nF capacitor from this pin to ground. Used to regulate the

feedback loop of channel B’s DC-DC converter.

33

Current Output Pin for DAC Channel B.

34

Supply for channel B’s current output stage (See Figure 14). To use the DC-DC feature of the device,

connect as shown in Figure 1.

35

AGND

Ground Reference Point for Analog Circuitry. This must be connected to 0 V.

36

Switching output for Channel B’s DC-DC circuitry. To use the DC-DC feature of the device, connect as

shown in Figure 1.

37

Ground connection for DC-DC switching circuit. This pin should always be connected to GND.

38

Ground connection for DC-DC switching circuit. This pin should always be connected to GND.

39

Switching output for Channel A’s DC-DC circuitry. To use the DC-DC feature of the device, connect as

shown in Figure 1.

40

Negative Analog Supply Pin.

41

Switching output for Channel D’s DC-DC circuitry. To use the DC-DC feature of the device, connect as

shown in Figure 1.

42

Ground connections for DC-DC switching circuit. This pin should always be connected to GND.

43

Ground connections for DC-DC switching circuit. This pin should always be connected to GND.

44

Switching output for Channel C’s DC-DC circuitry. To use the DC-DC feature of the device, connect as

shown in Figure 1.

45

Supply for DC-DC circuitry.

46

Supply for channel C’s current output stage (See Figure 14). To use the DC-DC feature of the device,

connect as shown in Figure 1.

47

Current Output Pin for DAC Channel C.

48

DC-DC Compensation Capacitor. Connect a 10 nF capacitor from this pin to ground. Used to regulate the

feedback loop of channel C’s DC-DC converter.

49

IGATEC

Optional connection for external pass transistor. Not required when using DC-DC. Should be left unconnected.

50

N/C

No Connection. Do not connect to this pin.

51

CHARTC

Hart Input Connection for DAC Channel B

52

N/C

No Connection. Do not connect to this pin.