AD5425 Datasheet, PDF (1/20 Pages) Analog Devices – 8-Bit, High Bandwidth Multiplying DAC with Serial Interface

8-Bit, High Bandwidth
Multiplying DAC with Serial Interface
AD5425^*
FEATURES
2.5 V to 5.5 V Supply Operation
50 MHz Serial Interface
8-Bit (Byte Load) Serial Interface, 6 MHz Update Rate
10 MHz Multiplying Bandwidth
؎10 V Reference Input
Low Glitch Energy < 2 nV-s
Extended Temperature Range –40؇C to +125؇C
10-Lead MSOP Package
Guaranteed Monotonic
4-Quadrant Multiplication
Power On Reset with Brownout Detection
LDAC Function
0.4 ␮A Typical Power Consumption
APPLICATIONS
Portable Battery-Powered Applications
Waveform Generators
Analog Processing
Instrumentation Applications
Programmable Amplifiers and Attenuators
Digitally-Controlled Calibration
Programmable Filters and Oscillators
Composite Video
Ultrasound
Gain, Offset, and Voltage Trimming
FUNCTIONAL BLOCK DIAGRAM
V_DD
AD5425
V_REF
8-BIT
R-2R DAC
R_FB
R
I_OUT1
I_OUT2
LDAC
POWER-ON
RESET
DAC REGISTER
INPUT LATCH
SYNC
SCLK
SDIN
CONTROL LOGIC AND
INPUT SHIFT REGISTER
GND
GENERAL DESCRIPTION
The AD5425 is a CMOS 8-bit current output digital-to-analog
converter that operates from a 2.5 V to 5.5 V power supply,
making it suited to battery-powered applications and many
other applications.
This DAC utilizes a double buffered 3-wire serial interface that
is compatible with SPI^®, QSPI™, MICROWIRE™, and most
DSP interface standards. In addition, an LDAC pin is provided,
which allows simultaneous update in a multi-DAC configuration.
On power-up, the internal shift register and latches are filled
with 0s and the DAC outputs are at 0 V.
As a result of processing on a CMOS submicron process, this
DAC offers excellent 4-quadrant multiplication characteristics,
with large signal multiplying bandwidths of 10 MHz.
The applied external reference input voltage (V_REF) determines
the full-scale output current. An integrated feedback resistor (R_FB)
provides temperature tracking and full-scale voltage output
when combined with an external I-to-V precision amplifier.
The AD5425 DAC is available in a small 10-lead MSOP package.
*Protected by U.S. Patent No. 5,969,657; other patents pending.
REV. 0
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