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AD9772EB Arkusz danych(PDF) 1 Page - Analog Devices |
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AD9772EB Arkusz danych(HTML) 1 Page - Analog Devices |
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1 / 30 page  REV. 0 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD9772 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 14-Bit, 150 MSPS TxDAC+™ with 2 Interpolation Filter FEATURES Single 2.7 V to 3.6 V Supply 14-Bit DAC Resolution and Input Data Width 150 MSPS Input Data Rate 63.3 MHz Reconstruction Passband @ 150 MSPS 75 dBc SFDR @ 25 MHz 2 Interpolation Filter with High or Low Pass Response 73 dB Image Rejection with 0.005 dB Passband Ripple “Zero-Stuffing” Option for Enhanced Direct IF Performance Internal 2 /4 Clock Multiplier 205 mW Power Dissipation; 13 mW with Power-Down Mode 48-Lead LQFP Package APPLICATIONS Communication Transmit Channel WCDMA Base Stations, Multicarrier Base Stations, Direct IF Synthesis Instrumentation PRODUCT DESCRIPTION The AD9772 is a single supply, oversampling, 14-bit digital-to- analog converter (DAC) optimized for baseband or IF waveform reconstruction applications requiring exceptional dynamic range. Manufactured on an advanced CMOS process, it integrates a complete, low distortion 14-bit DAC with a 2 × digital interpola- tion filter and clock multiplier. The on-chip PLL clock multi- plier 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. For baseband applications, the 2 × digital interpolation filter provides a low pass response, hence providing up to a three-fold reduction in the complexity of the analog reconstruction filter. It does so by multiplying the input data rate by a factor of two while simultaneously suppressing the original upper inband image by more than 73 dB. For direct IF applications, the 2 × digital interpolation filter response can be reconfigured to select the upper inband image (i.e., high pass response) while sup- pressing the original baseband image. To increase the signal level of the higher IF images and their passband flatness in di- rect IF applications, the AD9772 also features a “zero stuffing” option in which the data following the 2 × interpolation filter is upsampled by a factor of two by inserting midscale data samples. The AD9772 can reconstruct full-scale waveforms with band- widths as high as 63.3 MHz while operating at an input data rate of 150 MSPS. The 14-bit DAC provides differential current out- puts to support differential or single-ended applications. A segmented current source architecture is combined with a propri- etary 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 out- puts may be fed into a transformer or a differential op amp topology to obtain a single-ended output voltage using an ap- propriate resistive load. The on-chip bandgap reference and control amplifier are config- ured for maximum accuracy and flexibility. The AD9772 can be driven by the on-chip reference or by a variety of external refer- ence voltages. The full-scale current of the AD9772 can be adjusted over a 2 mA to 20 mA range, thus providing additional gain ranging capabilities. The AD9772 is available in a 48-lead LQFP package and speci- fied for operation over the industrial temperature range of –40 °C to +85 °C. PRODUCT HIGHLIGHTS 1. A flexible, low power 2 × interpolation filter supporting re- construction bandwidths of up to 63.3 MHz can be config- ured 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 AD9772 digital interface, consisting of edge-triggered latches and a flexible differential or single-ended clock input, can support input data rates up to 150 MSPS. 5. On-chip PLL clock multiplier generates all of the internal high speed clocks required by the interpolation filter and DAC. 6. The current output(s) of the AD9772 can easily be configured for various single-ended or differential circuit topologies. TxDAC+ is a trademark of Analog Devices, Inc. FUNCTIONAL BLOCK DIAGRAM 14-BIT DAC ZERO STUFF MUX 2 FIR INTERPOLATION FILTER EDGE- TRIGGERED LATCHES CLOCK DISTRIBUTION AND MODE SELECT 2 /4 MUX CONTROL FILTER CONTROL 1 /2 1 PLL CLOCK MULTIPLIER +1.2V REFERENCE AND CONTROL AMP AD9772 CLKCOM CLKVDD MOD0 MOD1 RESET PLLLOCK DIV0 DIV1 CLK+ CLK– DATA INPUTS (DB13...DB0) SLEEP DCOM DVDD ACOM AVDD REFLO PLLCOM LPF PLLVDD IOUTA IOUTB REFIO FSADJ |
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