AD9755 Converter Datasheet
14-Bit/ 300 MSPS High-Speed TxDAC+ D/A Converter
|Total Page||29 Pages|
14-Bit, 300 MSPS
High Speed TxDAC+® D/A Converter
14-Bit Dual Muxed Port DAC
300 MSPS Output Update Rate
Excellent SFDR and IMD Performance
SFDR to Nyquist @ 25 MHz Output: 71 dB
Internal Clock Doubling PLL
Differential or Single-Ended Clock Input
On-Chip 1.2 V Reference
Single 3.3 V Supply Operation
Power Dissipation: 155 mW @ 3.3 V
Communications: LMDS, LMCS, MMDS
QAM and OFDM
The AD9755 is a dual, muxed port, ultrahigh speed, single-
channel, 14-bit CMOS DAC. It integrates a high quality 14-bit
TxDAC+ core, a voltage reference, and digital interface circuitry
into a small 48-lead LQFP package. The AD9755 offers excep-
tional ac and dc performance while supporting update rates up
to 300 MSPS.
The AD9755 has been optimized for ultrahigh speed applica-
tions up to 300 MSPS where data rates exceed those possible on
a single data interface port DAC. The digital interface consists
of two buffered latches as well as control logic. These latches
can be time multiplexed to the high speed DAC in several ways.
This PLL drives the DAC latch at twice the speed of the exter-
nally applied clock and is able to interleave the data from the
two input channels. The resulting output data rate is twice that
of the two input channels. With the PLL disabled, an external
2× clock may be supplied and divided by two internally.
The CLK inputs (CLK+/CLK–) can be driven either differentially
or single-ended, with a signal swing as low as 1 V p-p.
FUNCTIONAL BLOCK DIAGRAM
RESET LPF DIV0 DIV1 PLLLOCK
The DAC utilizes a segmented current source architecture com-
bined with a proprietary switching technique to reduce glitch
energy and maximize dynamic accuracy. Differential current
outputs support single-ended or differential applications. The
differential outputs each provide a nominal full-scale current
from 2 mA to 20 mA.
The AD9755 is manufactured on an advanced low cost 0.35 µm
CMOS process. It operates from a single supply of 3.0 V to 3.6 V
and consumes 155 mW of power.
1. The AD9755 is a member of a pin compatible family of high
speed TxDAC+s providing 10-, 12-, and 14-bit resolution.
2. Ultrahigh Speed 300 MSPS Conversion Rate.
3. Dual 14-Bit Latched, Multiplexed Input Ports. The AD9755
features a flexible digital interface allowing high speed data
conversion through either a single or dual port input.
4. Low Power. Complete CMOS DAC function operates on
155 mW from a 3.0 V to 3.6 V single supply. The DAC full-
scale current can be reduced for lower power operation.
5. On-Chip Voltage Reference. The AD9755 includes a 1.20 V
temperature compensated band gap voltage reference.
Information furnished by Analog Devices is believed to be accurate and
reliable. 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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.
AD9755* Product Page Quick Links
Last Content Update: 11/01/2016
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|Features||a 14-Bit, 300 MSPS High Speed TxDAC+® D/A Converter AD9755 FEATURES 14-Bit Dual Muxed Port DAC 300 MSPS Output Upd ate Rate Excellent SFDR and IMD Perform ance SFDR to Nyquist @ 25 MHz Output: 7 1 dB Internal Clock Doubling PLL Differ ential or Single-Ended Clock Input On-C hip 1.2 V Reference Single 3.3 V Supply Operation Power Dissipation: 155 mW @ 3.3 V 48-Lead LQFP APPLICATIONS Communi cations: LMDS, LMCS, MMDS Base Stations Digital Synthesis QAM and OFDM PRODUCT DESCRIPTION The AD9755 is a dual, muxe d port, ultrahigh speed, singlechannel, 14-bit CMOS DAC. It integrates a high quality 14-bit TxDAC+ core, a voltage r eference, and digital interface circuit ry into a small 48-lead LQFP package. T he AD9755 offers exceptional ac and dc performance while supporting update rat es up to 300 MSPS. The AD9755 has been optimized for ultrahigh speed applicati ons up to 300 MSPS where data rates exc eed those possible on a single data int erface port DAC. The digital interface consists of two buffered.|
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