
Quad Channel, 16-Bit,
Serial Input, 4 mA to 20 mA Output DAC,
Dynamic Power Control, HART Connectivity
Data Sheet
Rev. D
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FEATURES
16-bit resolution and monotonicity
Dynamic power control for thermal management
or external PMOS mode
Current output ranges: 0 mA to 20 mA, 4 mA to 20 mA,
or 0 mA to 24 mA
±0.05% total unadjusted error (TUE) maximum
User programmable offset and gain
On-chip diagnostics
On-chip reference (±10 ppm/°C maximum)
40°C to +105°C temperature range
APPLICATIONS
Process control
Actuator control
PLCs
HART network connectivity
GENERAL DESCRIPTION
The AD5757 is a quad, current output DAC that operates with a
power supply range from 10.8 V to 33 V. On-chip dynamic
power control minimizes package power dissipation by regulat-
ing the voltage on the output driver from 7.4 V to 29.5 V using
a dc-to-dc boost converter optimized for minimum on-chip
power dissipation.
Each channel has a corresponding CHART pin so that HART
signals can be coupled onto the current output of the AD5757.
The part uses a versatile 3-wire serial interface that operates at
clock rates of up to 30 MHz and is compatible with standard
SPI, QSPI, MICROWIRE, DSP, and microcontroller interface
standards. The interface also features optional CRC-8 packet
error checking, as well as a watchdog timer that monitors
activity on the interface.
PRODUCT HIGHLIGHTS
1.
Dynamic power control for thermal management.
2.
16-bit performance.
3.
Multichannel.
4.
HART compliant.
COMPANION PRODUCTS
FUNCTIONAL BLOCK DIAGRAM
AD5757
AGND
AVDD
+15V
AVCC
5.0V
DVDD
DGND
LDAC
CLEAR
SCLK
SDIN
SYNC
SDO
FAULT
DC-TO-DC
CONVERTER
DIGITAL
INTERFACE
REFERENCE
CURRENT AND
VOLTAGE
OUTPUT RANGE
SCALING
ALERT
REFOUT
REFIN
NOTES
1. x = A, B, C, AND D.
AD1
AD0
DAC A
SWx
VBOOST_x
GAIN REG A
OFFSET REG A
RSET_x
CHARTx
IOUT_x
DAC CHANNEL B
DAC CHANNEL A
DAC CHANNEL C
DAC CHANNEL D
7.4V TO 29.5V
+
0922
5-
101
Figure 1.