AD5450/AD5451/AD5452/AD5453*
a
REV. PrD Oct, 2003
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8/10/12/14-Bit High Bandwidth
Multiplying DACs with Serial Interface
Preliminary Technical Data
PRELIMINARY TECHNICAL DATA
*US Patent Number 5,689,257
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
FEATURES
+2.5 V to +5.5 V Supply Operation
50MHz Serial Interface
10MHz Multiplying Bandwidth
±10V Reference Input
8-Lead TSOT & MSOP Packages
Pin Compatible 8, 10, 12 and 14 Bit Current Output DACs
Extended Temperature range –40°C to +125°C
Guaranteed Monotonic
Four Quadrant Multiplication
Power On Reset with brown out detect
<5µA typical Current 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
GENERAL DESCRIPTION
The AD5450/AD5451/AD5452/AD5453 are CMOS 8,
10, 12 and 14-bit Current Output digital-to-analog
converters respectively.
These devices operate from a +2.5 V to 5.5 V power sup-
ply, making them suited to battery powered applications
and many other applications.
These DACs utilize double buffered 3-wire serial interface
that is compatible with SPI
TM
, QSPI
TM
, MICROWIRE
TM
and most DSP interface standards.
On power-up, the internal shift register and latches are
filled with zeros and the DAC output is at zero scale.
As a result of manufacture on a CMOS sub micron
process, they offer excellent four quadrant multiplication
characteristics, with large signal multiplying bandwidths
of 10MHz.
FUNCTIONAL BLOCK DIAGRAM
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
Current to Voltage precision amplifier.
The AD5450/AD5451/AD5452/AD5453 DACs are
available in small 8-lead TSOT & MSOP packages.
CONTROL LOGIC &
INPUT SHIFT REGISTER
SCLK
SYNC
AD5450/
AD5451/
AD5452/
AD5453
V
REF
I
OUT1
R
FB
R
8/10/12/14
BIT
R-2R DAC
DAC REGISTER
SDIN
INPUT LATCH
V
DD
Power On
Reset
GND