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AN-1230
APPLICATION NOTE
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8 to 16 Channels of Programmable Voltage with Excellent Temperature Drift
Performance Using the AD5390/AD5391/AD5392 DACs
Rev. B | Page 1 of 2
CIRCUIT FUNCTION AND BENEFITS
This circuit is a multichannel DAC configuration with excellent
temperature drift performance. It utilizes the AD5390/AD5391/
AD5392 to provide between 8 and 16 DAC channels with 12 to
14 bits of resolution. The ADR421/ADR431 precision voltage
reference ensures that the temperature stability of the circuit is
typically less than 3 ppm/°C.
CIRCUIT DESCRIPTION
Table 1. Devices Connected/Referenced
Product Description
AD5390
/
AD5391
/
AD5392 3 V/5
V
, 16-
/
14-
/
12-bit digital-to-
analog converter
ADR421 Precision 2.5 V voltage reference
ADR431 Precision 2.5 V low noise voltage
reference
The AD5390 and AD5391 are complete single-supply, 16-channel,
14-bit and 12-bit DACs, respectively. The AD5392 is a complete
single-supply, 8-channel, 14-bit DAC. Devices are available in
both 64-lead LFCSP and 52-lead LQFP packages. All channels
have an on-chip output amplifier with rail-to-rail operation.
Figure 1 shows a typical configuration for the AD5390/AD5391/
AD5392 when configured for use with an external reference. In
the circuit shown, all AGND, SIGNAL_GND, and DAC_GND
pins are tied together to a common AGND. AGND and DGND
are connected together at the AD5390/AD5391/AD5392 device.
On power-up, the AD5390/AD5391/AD5392 defaults to
external reference operation.
08251-001
ADR431/
ADR421
AD539x
AV
DD
DV
DD
SIGNAL_GNDDAC_GND DGND
VOUT 15
VOUT 0
AGND
REFOUT/REFIN
REF_GND
0.1µF
10µF 0.1µF
0.1µF
5.0
V
2.5V
5.0
V
Figure 1. AD5390/AD5391/AD5392 Typical Configuration with External Reference (Simplified Schematic)
