Datasheet

AD5757 Data Sheet
Rev. D | Page 12 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 AV
DD
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 COMP
DCDC_A
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 AI
CC
Supply Requirements—Slewing sections in the Device Features section for more
information).
24 V
BOOST_A
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 I
OUT_A
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 COMP
DCDC_B
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 AI
CC
Supply Requirements—Slewing sections in the Device Features section for more
information).
33 I
OUT_B
Current Output Pin for DAC Channel B.
34
V
BOOST_B
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 SW
B
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 GNDSW
B
Ground Connection for DC-to-DC Switching Circuit. This pin should always be connected to ground.
38
GNDSW
A
Ground Connection for DC-to-DC Switching Circuit. This pin should always be connected to ground.
39 SW
A
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 SW
D
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 GNDSW
D
Ground Connections for DC-to-DC Switching Circuit. This pin should always be connected to ground.
43 GNDSW
C
Ground Connections for DC-to-DC Switching Circuit. This pin should always be connected to ground.
44 SW
C
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 AV
CC
Supply for DC-to-DC Circuitry.
46 V
BOOST_C
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 I
OUT_C
Current Output Pin for DAC Channel C.
48 COMP
DCDC_C
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 AI
CC
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.