AD5757

Rev. A | Page 11 of 44

Pin No.

Mnemonic

Description

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 the Device Features section for more information.

16

FAULT

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

voltage mode is detected, a PEC error is detected, or an overtemperature is detected (see the Device Features

section). Open-drain output.

18

RESET

Hardware Reset. Active Low Input.

19

Positive Analog Supply. The voltage range is from 10.8 V to 33 V.

20, 25,

28, 30,

50, 52,

55, 60

NC

No Connect. Do not connect to this pin.

21

CHARTA

HART Input Connection for DAC Channel A.

22

IGATEA

Optional Connection for External Pass Transistor. Should be left unconnected when using the dc-to-dc converter. See

the External PMOS Mode section for more information.

23

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

feedback loop of the Channel A dc-to-dc converter. Alternatively, if using an external compensation resistor,

place a resistor in series with a capacitor to ground from this pin (see the DC-to-DC Converter Compensation

Capacitors and the AICC Supply Requirements—Slewing sections in the Device Features section for more

information).

24

Supply for Channel A Current Output Stage (see Figure 49). To use the dc-to-dc feature of the device, connect as

shown in Figure 56.

26

Current Output Pin for DAC Channel A.

27, 40, 53

AGND

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

29

CHARTB

HART Input Connection for DAC Channel B.

31

IGATEB

Optional Connection for External Pass Transistor. Should be left unconnected when using the dc-to-dc converter.

See the External PMOS Mode section for more information.

32

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

feedback loop of the Channel B dc-to-dc converter. Alternatively, if using an external compensation resistor,

place a resistor in series with a capacitor to ground from this pin (see the DC-to-DC Converter Compensation

Capacitors and AICC Supply Requirements—Slewing sections in the Device Features section for more

information).

33

Current Output Pin for DAC Channel B.

34

Supply for Channel B Current Output Stage (see Figure 49). To use the dc-to-dc feature of the device, connect as

shown in Figure 56.

35

AGND

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

36

Switching Output for Channel B DC-to-DC Circuitry. To use the dc-to-dc feature of the device, connect as shown

in Figure 56.

37

Ground Connection for DC-to-DC Switching Circuit. This pin should always be connected to ground.

38

Ground Connection for DC-to-DC Switching Circuit. This pin should always be connected to ground.

39

Switching Output for Channel A DC-to-DC Circuitry. To use the dc-to-dc feature of the device, connect as shown

in Figure 56.

41

Switching Output for Channel D DC-to-DC Circuitry. To use the dc-to-dc feature of the device, connect as shown

in Figure 56.

42

Ground Connections for DC-to-DC Switching Circuit. This pin should always be connected to ground.

43

Ground Connections for DC-to-DC Switching Circuit. This pin should always be connected to ground.

44

Switching Output for Channel C DC-to-DC Circuitry. To use the dc-to-dc feature of the device, connect as shown

in Figure 56.

45

Supply for DC-to-DC Circuitry.

46

Supply for Channel C Current Output Stage (see Figure 49). To use the dc-to-dc feature of the device, connect as

shown in Figure 56.

47

Current Output Pin for DAC Channel C.

48

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

feedback loop of the Channel C dc-to-dc converter. Alternatively, if using an external compensation resistor,

place a resistor in series with a capacitor to ground from this pin (see the DC-to-DC Converter Compensation

Capacitors and AICC Supply Requirements—Slewing sections in the Device Features section for more

information).

49

IGATEC

Optional Connection for External Pass Transistor. Should be left unconnected when using the dc-to-dc converter. See

the External PMOS Mode section for more information.