High performance member of pin-compatible
TxDAC product family
Excellent spurious-free dynamic range performance
SFDR to Nyquist
83 dBc @ 5 MHz output
80 dBc @ 10 MHz output
73 dBc @ 20 MHz output
SNR @ 5 MHz output, 125 MSPS: 77 dB
Twos complement or straight binary data format
Differential current outputs: 2 mA to 20 mA
Power dissipation: 135 mW @ 3.3 V
Power-down mode: 15 mW @ 3.3 V
On-chip 1.2 V reference
CMOS-compatible digital interface
28-lead SOIC, 28-lead TSSOP, and 32-lead LFCSP packages
The AD97441 is a 14-bit resolution, wideband, third generation
member of the TxDAC series of high performance, low power
CMOS digital-to-analog converters (DACs). The TxDAC fam-
ily, consisting of pin-compatible 8-, 10-, 12-, and 14-bit DACs,
is specifically optimized for the transmit signal path of commu-
nication systems. All of the devices share the same interface
options, small outline package, and pinout, providing an up-
ward or downward component selection path based on per-
formance, resolution, and cost. The AD9744 offers exceptional
ac and dc performance while supporting update rates up to
The AD9744’s low power dissipation makes it well suited for
portable and low power applications. Its power dissipation can
be further reduced to a mere 60 mW with a slight degradation
in performance by lowering the full-scale current output. Also,
a power-down mode reduces the standby power dissipation to
approximately 15 mW. A segmented current source architecture
is combined with a proprietary switching technique to reduce
spurious components and enhance dynamic performance.
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However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
14-Bit, 210 MSPS
TxDAC® D/A Converter
Wideband communication transmit channel
Wireless local loops
Digital radio links
Direct digital synthesis (DDS)
FUNCTIONAL BLOCK DIAGRAM
DIGITAL DATA INPUTS (DB13–DB0)
Edge-triggered input latches and a 1.2 V temperature compen-
sated band gap reference have been integrated to provide a
complete monolithic DAC solution. The digital inputs support
3 V CMOS logic families.
1. The AD9744 is the 14-bit member of the pin compatible TxDAC
family, which offers excellent INL and DNL performance.
2. Data input supports twos complement or straight binary data
3. High speed, single-ended CMOS clock input supports
210 MSPS conversion rate.
4. Low power: Complete CMOS DAC function operates on
135 mW from a 2.7 V to 3.6 V single supply. The DAC full-
scale current can be reduced for lower power operation, and a
sleep mode is provided for low power idle periods.
5. On-chip voltage reference: The AD9744 includes a 1.2 V
temperature compensated band gap voltage reference.
6. Industry-standard 28-lead SOIC, 28-lead TSSOP, and 32-lead
1Protected by U.S. Patent Numbers 5568145, 5689257, and 5703519.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
©2005 Analog Devices, Inc. All rights reserved.