Dual, Current-Output,
Serial-Input, 16-/14-Bit DACs
AD5545/AD5555
FEATURES
16-bit resolution AD5545
14-bit resolution AD5555
±1 LSB DNL monotonic
±1 LSB INL
2 mA full-scale current ±20%, with VREF = 10 V
0.5 μs settling time
2Q multiplying reference-input 6.9 MHz BW
Zero or midscale power-up preset
Zero or midscale dynamic reset
3-wire interface
Compact TSSOP-16 package
FUNCTIONAL BLOCK DIAGRAM
VREFA
VREFB
16 OR 14
VDD
RFBA
D0..DX
INPUT
REGISTER
SDI
DAC A
REGISTER R
R
IOUTA
DAC A
AGNDA
RFBB
INPUT
REGISTER
CS
EN
CLK
DAC B
REGISTER R
R
IOUTB
DAC B
AGNDB
DAC A
B
ADDR
DECODE
DGND
RS MSB
AD5545/
AD5555
POWERON
RESET
LDAC
02918-0- 001
Figure 1.
APPLICATIONS
Automatic test equipment
Instrumentation
Digitally controlled calibration
Industrial control PLCs
Programmable attenuator
PRODUCT OVERVIEW
The AD5545/AD5555 are 16-bit/14-bit, current-output, digitalto-analog converters designed to operate from a single 5 V
supply with bipolar output up to ±15 V capability.
An external reference is needed to establish the full-scale
output-current. An internal feedback resistor (RFB) enhances
the resistance and temperature tracking when combined
with an external op amp to complete the I-to-V conversion.
A serial data interface offers high speed, 3-wire microcontroller
compatible inputs using serial data in (SDI), clock (CLK), and
chip select (CS). Additional LDAC function allows
simultaneous update operation. The internal reset logic allows
power-on preset and dynamic reset at either zero or midscale,
depending on the state of the MSB pin.
The AD5545/AD5555 are packaged in the compact TSSOP-16
package and can be operated from –40°C to +85°C.
Rev. D
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