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AD5545 Datasheet

16-/14-Bit DACs

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Data Sheet
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 16-lead TSSOP package
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, digital-
to-analog converters designed to operate from a 4.5 V to 5.5 V
supply range.
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.
Dual, Current-Output,
Serial-Input, 16-/14-Bit DACs
AD5545/AD5555
FUNCTIONAL BLOCK DIAGRAM
VREFA VREFB
16 OR 14
VDD
D0..DX
SDI INPUT
REGISTER R
DAC A
REGISTER R
CS
CLK
EN
DAC A
B
ADDR
DECODE
DGND
INPUT
REGISTER R
DAC B
REGISTER R
POWER-
ON
RESET
RS MSB
LDAC
Figure 1.
DAC A
DAC B
RFBA
IOUTA
AGNDA
RFBB
IOUTB
AGNDB
AD5545/
AD5555
02918-0-001
Rev. I
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