12-/14-Bit High Bandwidth
Multiplying DACs with Serial Interface
AD5444/AD5446
GENERAL DESCRIPTION
FEATURES
12 MHz multiplying bandwidth
INL of 0.ꢀ LSB at 12 bits
Pin-compatible 12-/14-bit current output DAC
2.ꢀ V to ꢀ.ꢀ V supply operation
10-lead MSOP package
10 V reference input
ꢀ0 MHz serial interface
2.7 MSPS update rate
The AD5444/AD54461 are CMOS 12-bit and 14-bit, current
output, digital-to-analog converters (DACs). Operating from a
single 2.5 V to 5.5 V power supply, these devices are suited for
battery-powered and other applications.
As a result of the CMOS submicron manufacturing process,
these parts offer excellent 4-quadrant multiplication char-
acteristics of up to 12 MHz.
These DACs use a double-buffered, 3-wire serial interface that
is compatible with SPI®, QSPI™, MICROWIRE™, and most DSP
interface standards. On power-up, the internal shift register and
latches are filled with 0s, and the DAC output is at zero scale.
Extended temperature range: −40°C to +12ꢀ°C
4-quadrant multiplication
Power-on reset with brownout detection
0.4 μA typical current consumption
Guaranteed monotonic
The applied external reference input voltage (VREF) determines
the full-scale output current. These parts can handle 10 V
inputs on the reference, despite operating from a single-supply
power supply of 2.5 V to 5.5 V. An integrated feedback resistor
(RFB) provides temperature tracking and full-scale voltage output
when combined with an external current-to-voltage precision
amplifier. The AD5444/AD5446 DACs are available in small
10-lead MSOP packages, which are pin-compatible with the
AD5425/AD5426/AD5432/AD5443 family of DACs.
APPLICATIONS
Portable, battery-powered applications
Waveform generators
Analog processing
Instrumentation applications
Programmable amplifiers and attenuators
Digitally controlled calibration
Programmable filters and oscillators
Composite video
1 US Patent Number 5,689,257.
Ultrasound
Gain, offset, and voltage trimming
Automotive radar
FUNCTIONAL BLOCK DIAGRAM
V
V
REF
DD
R
FB
R
AD5444/
AD5446
I
I
1
2
OUT
OUT
12-BIT
R-2R DAC
DAC REGISTER
INPUT LATCH
POWER-ON
RESET
SYNC
SCLK
SDIN
CONTROL LOGIC AND
INPUT SHIFT REGISTER
SDO
GND
Figure 1.
Rev. C
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