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AD9744ACPRL7 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD9744ACPRL7 Arkusz danych(HTML) 1 Page - Analog Devices |
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1 / 32 page  14-Bit, 210 MSPS TxDAC® D/A Converter AD9744 Rev. B 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. 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2005 Analog Devices, Inc. All rights reserved. FEATURES 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 Edge-triggered latches APPLICATIONS Wideband communication transmit channel Direct IFs Base stations Wireless local loops Digital radio links Direct digital synthesis (DDS) Instrumentation FUNCTIONAL BLOCK DIAGRAM 1.2V REF REFLO 3.3V RSET 0.1 µF CLOCK SLEEP REFIO FS ADJ DVDD DCOM CLOCK DIGITAL DATA INPUTS (DB13–DB0) 150pF 3.3V AVDD ACOM AD9744 CURRENT SOURCE ARRAY IOUTA IOUTB MODE LSB SWITCHES SEGMENTED SWITCHES LATCHES Figure 1. GENERAL DESCRIPTION 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 210 MSPS. 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. 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. PRODUCT HIGHLIGHTS 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 coding. 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 LFCSP packages. 1Protected by U.S. Patent Numbers 5568145, 5689257, and 5703519. |
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