Dual 8-/10-/12-/14-/16-Bit
250 MSPS Digital-to-Analog Converters
AD9741/AD9743/AD9745/AD9746/AD9747
FEATURES
GENERAL DESCRIPTION
High dynamic range, dual DACs
Low noise and intermodulation distortion
The AD9741/AD9743/AD9745/AD9746/AD9747 are pin-
compatible, high dynamic range, dual digital-to-analog
Single carrier WCDMA ACLR = 80 dBc @ 61.44 MHz IF
Innovative switching output stage permits useable outputs
beyond Nyquist frequency
LVCMOS inputs with dual-port or optional interleaved
single-port operation
Differential analog current outputs are programmable from
8.6 mA to 31.7 mA full scale
Auxiliary 10-bit current DACs with source/sink capability for
external offset nulling
converters (DACs) with 8-/10-/12-/ 14-/16-bit resolutions
and sample rates of up to 250 MSPS. The devices include
specific features for direct conversion transmit applications,
including gain and offset compensation, and they interface
seamlessly with analog quadrature modulators, such as the
ADL5370.
A proprietary, dynamic output architecture permits synthesis
of analog outputs even above Nyquist by shifting energy away
from the fundamental and into the image frequency.
Internal 1.2 V precision reference voltage source
Operates from 1.8 V and 3.3 V supplies
315 mW power dissipation
Full programmability is provided through a serial peripheral
interface (SPI) port. In addition, some pin-programmable
features are offered for those applications without a controller.
Small footprint, Pb-free, 72-Lead LFCSP
PRODUCT HIGHLIGHTS
APPLICATIONS
1. Low noise and intermodulation distortion (IMD) enables
high quality synthesis of wideband signals.
Wireless infrastructure:
WCDMA, CDMA2000, TD-SCDMA, WiMAX
Wideband communications:
LMDS/MMDS, point-to-point
Instrumentation:
2. Proprietary switching output for enhanced dynamic
performance.
3. Programmable current outputs and dual auxiliary DACs
provide flexibility and system enhancements.
RF signal generators, arbitrary waveform generators
FUNCTIONAL BLOCK DIAGRAM
CLKP
CLKN
IOUT1P
16-BIT
DAC1
IOUT1N
INTERFACE LOGIC
10
IOUT2P
16-BIT
PID<15:0>
DAC2
IOUT2N
GAIN
DAC
CMOS
INTERFACE
GAIN
DAC
AUX1P
OFFSET
INTERNAL
REFERENCE
AND
P2D<15:0>
DAC
AUX1N
SERIAL
PERIPHERAL
INTERFACE
AUX2P
OFFSET
DAC
BIAS
AUX2N
Figure 1.
Rev. 0
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