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AD9755 Datasheet(PDF) 1 Page - Analog Devices |
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AD9755 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 28 page  a AD9755 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 registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. REV. B 14-Bit, 300 MSPS High Speed TxDAC+® D/A Converter FUNCTIONAL BLOCK DIAGRAM AVDD ACOM REFIO FSADJ PORT1 IOUTA IOUTB AD9755 DVDD DCOM LATCH LATCH CLK+ CLK– CLKVDD PLLVDD CLKCOM RESET LPF DIV0 DIV1 PLLLOCK PLL CLOCK MULTIPLIER DAC REFERENCE MUX PORT2 PRODUCT DESCRIPTION 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. FEATURES 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 48-Lead LQFP APPLICATIONS Communications: LMDS, LMCS, MMDS Base Stations Digital Synthesis QAM and OFDM 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. PRODUCT HIGHLIGHTS 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. |
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