AD5757 Analog Devices, AD5757 Datasheet - Page 12

• Manufacturer Part Number: AD5757
• Description: Quad Channel, 16-Bit, Serial Input, 4-20mA Output DAC, Dynamic Power Control, HART Connectivity
• Manufacturer: Analog Devices

Specifications of AD5757

• Resolution (bits): 16bit
• Dac Update Rate: 60kSPS
• Dac Settling Time: 15µs
• Max Pos Supply (v): +33V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: SPI

AD5757
Pin No.
15
16
18
19
20, 25,
28, 30,
50, 52,
55, 60
21
22
23
24
26
27, 40, 53
29
31
32
33
34
35
36
37
38
39
41
42
43
44
45
46
47
48
49
Mnemonic
ALERT
FAULT
RESET
AV
NC
CHARTA
IGATEA
COMP
V
I
AGND
CHARTB
IGATEB
COMP
I
V
AGND
SW
GNDSW
GNDSW
SW
SW
GNDSW
GNDSW
SW
AV
V
I
COMP
IGATEC
OUT_A
OUT_B
OUT_C
BOOST_A
BOOST_B
BOOST_C
DD
CC
B
A
D
C
DCDC_A
DCDC_B
DCDC_C
B
A
D
C
Description
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.
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.
Hardware Reset. Active Low Input.
Positive Analog Supply. The voltage range is from 10.8 V to 33 V.
No Connect. Do not connect to this pin.
HART Input Connection for DAC Channel A.
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.
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
information).
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.
Current Output Pin for DAC Channel A.
Ground Reference Point for Analog Circuitry. This must be connected to 0 V.
HART Input Connection for DAC Channel B.
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.
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
information).
Current Output Pin for DAC Channel 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.
Ground Reference Point for Analog Circuitry. This pin must be connected to 0 V.
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.
Ground Connection for DC-to-DC Switching Circuit. This pin should always be connected to ground.
Ground Connection for DC-to-DC Switching Circuit. This pin should always be connected to ground.
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.
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.
Ground Connections for DC-to-DC Switching Circuit. This pin should always be connected to ground.
Ground Connections for DC-to-DC Switching Circuit. This pin should always be connected to ground.
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.
Supply for DC-to-DC Circuitry.
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.
Current Output Pin for DAC Channel 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
information).
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.
CC
CC
Supply Requirements—Slewing sections in the Device Features section for more
Supply Requirements—Slewing sections in the Device Features section for more
CC
Supply Requirements—Slewing sections in the Device Features section for more
Rev. B | Page 12 of 44
Data Sheet