8-/10-/12-/14-Bit High Bandwidth
Multiplying DACs with Serial Interface
AD5450/AD5451/AD5452/AD5453
FEATURES
FUNCTIONAL BLOCK DIAGRAM
12 MHz multiplying bandwidth
INL of 0.25 LSB ꢀ 8-bit
8-lead TSOT and MSOP packages
2.5 V to 5.5 V supply operation
Pin-compatible 8-/10-/12-/14-bit current output DACs
10 V reference input
V
V
REF
DD
R
FB
R
AD5450/
AD5451/
AD5452/
AD5453
8-/10-/12-/14-BIT REF
R-2R DAC
I
1
OUT
50 MHz serial interface
2.7 MSPS update rate
Extended temperature range: –40°C to +125°C
4-quadrant multiplication
DAC REGISTER
INPUT LATCH
POWER-ON
RESET
Power-on reset with brownout detect
<0.4 μA typical current consumption
Guaranteed monotonic
SYNC
SCLK
SDIN
CONTROL LOGIC
AND INPUT SHIFT
REGISTER
Qualified for automotive applications
GND
APPLICATIONS
Figure 1.
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/AD54531 are CMOS 8-/10-/
12-/14-bit current output digital-to-analog converters, respectively.
These devices operate from a 2.5 V to 5.5 V power supply, making
them suited to several applications, including battery-powered
applications.
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.
As a result of manufacture on a CMOS submicron process,
these DACs offer excellent 4-quadrant multiplication
characteristics of up to 12 MHz.
The AD5450/AD5451/AD5452/AD5453 DACs are available in
small 8-lead TSOT, and the AD5452/AD5453 are also available
in MSOP packages. The AD5453 also comes in 8-lead LFCSP.
These DACs utilize a double-buffered, 3-wire serial interface
that is compatible with SPI®, QSPI™, MICROWIRE™, and most
DSP interface standards. Upon power-up, the internal shift
register and latches are filled with 0s, and the DAC output is at
zero scale.
1 U.S. Patent Number 5,689,257.
Rev. E
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