®
14-Bit, 160 MSPS TxDAC+
with 2 Interpolation Filter
AD9772A
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Single 3.1V to 3.5V Supply
14-Bit DAC Resolution and Input DataWidth
160 MSPS Input Data Rate
67.5 MHz Reconstruction Pass Band @ 160 MSPS
74 dBc SFDR @ 25 MHz
2 Interpolation Filter with High- or Low-Pass Response
73 dB Image Rejection with 0.005 dB Pass-band Ripple
Zero-Stuffing Option for Enhanced Direct IF Performance
Internal 2/4 Clock Multiplier
CLKCOM CLKVDD MOD0 MOD1 RESET PLLLOCK DIV0 DIV1
AD9772A
CLK+
PLLCOM
LPF
CLOCK DISTRIBUTION
AND MODE SELECT
PLL CLOCK
MULTIPLIER
CLK–
FILTER
MUX
PLLVDD
1
1/2
2/4
CONTROL CONTROL
I
ZERO-
STUFF
MUX
DATA
INPUTS
(DB13...
DB0)
OUTA
2 FIR
INTER-
POLATION
FILTER
EDGE-
TRIGGERED
LATCHES
14-BIT DAC
I
OUTB
250 mW Power Dissipation; 13 mW with Power-Down
Mode
48-Lead LQFP Package
REFIO
FSADJ
+1.2V REFERENCE
AND CONTROL AMP
SLEEP
APPLICATIONS
DCOM DVDD
ACOM AVDD
REFLO
CommunicationTransmit Channel
W-CDMA Base Stations, Multicarrier Base Stations,
Direct IF Synthesis,Wideband Cable Systems
Instrumentation
A
segmented current source architecture is combined with a
proprietary switching technique to reduce spurious components
and enhance dynamic performance. Matching between the two
current outputs ensures enhanced dynamic performance in a
differential output configuration.The differential current outputs
may be fed into a transformer or a differential op amp topology
to obtain a single-ended output voltage using an appropriate
resistive load.
GENERAL DESCRIPTION
The AD9772A is a single-supply, oversampling, 14-bit digi-
tal-to-analog converter (DAC) optimized for baseband or IF
waveform reconstruction applications requiring exceptional
dynamic range. Manufactured on an advanced CMOS pro-
cess, it integrates a complete, low distortion 14-bit DAC with
The on-chip band gap reference and control amplifier are con-
figured for maximum accuracy and flexibility.The AD9772A
can be driven by the on-chip reference or by a variety of external
reference voltages.The full-scale current of the AD9772A can be
adjusted over a 2 mA to 20 mA range, thus providing additional
gain ranging capabilities.
a 2
digital interpolation filter and clock multiplier.The on-
chip PLL clock multiplier provides all the necessary clocks
for the digital filter and the 14-bit DAC. A flexible differential
clock input allows for a single-ended or differential clock
driver for optimum jitter performance.
The AD9772A is available in a 48-lead LQFP package and is
specified for operation over the industrial temperature range of
–40°C to +85°C.
For baseband applications, the 2 digital interpolation filter
provides a low-pass response, thus providing as much as a
threefold reduction in the complexity of the analog reconstruc-
tion filter. It does so by multiplying the input data rate by a
factor of 2 while suppressing the original upper in-band image
by more than 73 dB. For direct IF applications, the 2 digital
interpolation filter response can be reconfigured to select the
upper in-band image (i.e., high-pass response) while suppress-
ing the original baseband image. To increase the signal level of
the higher IF images and their pass-band flatness in direct IF
applications, the AD9772A also features a zero-stuffing op-
tion in which the data following the 2 interpolation filter is
upsampled by a factor of 2 by inserting midscale data samples.
PRODUCT HIGHLIGHTS
1. A flexible, low power 2 interpolation filter supporting recon-
struction bandwidths of up to 67.5 MHz can be configured
for a low- or high-pass response with 73 dB of image rejection
for traditional baseband or direct IF applications.
2. A zero-stuffing option enhances direct IF applications.
3. A low glitch, fast settling 14-bit DAC provides exceptional
dynamic range for both baseband and direct IF waveform
reconstruction applications.
4. The AD9772A digital interface, consisting of edge-triggered
latches and a flexible differential or single-ended clock input,
can support input data rates up to 160 MSPS.
The AD9772A can reconstruct full-scale waveforms with band-
widths as high as 67.5 MHz while operating at an input data
rate of 160 MSPS.The 14-bit DAC provides differential current
outputs to support differential or single-ended applications.
5. On-chip PLL clock multiplier generates all of the internal high
speed clocks required by the interpolation filter and DAC.
REV.B
6. The current output(s) of the AD9772A can easily be configured
for various single-ended or differential circuit topologies.
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed byAnalog Devices for its
use, nor for any infringements of patents or other rights of third parties
that may result from its use. No license is granted by implication or oth-
erwise under any patent or patent rights of Analog Devices.Trademarks
andregisteredtrademarksarethepropertyoftheirrespectivecompanies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© 2003 Analog Devices, Inc. All rights reserved.
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