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AD9772A-EB bảng dữ liệu(PDF) 1 Page - Analog Devices |
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AD9772A-EB bảng dữ liệu(HTML) 1 Page - Analog Devices |
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1 / 40 page  14-Bit, 160 MSPS TxDAC+ with 2× Interpolation Filter AD9772A Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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 ©2008 Analog Devices, Inc. All rights reserved. FEATURES Single 3.1 V to 3.5 V supply 14-bit DAC resolution and input data width 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 250 mW power dissipation; 13 mW with power-down mode 48-lead LQFP package APPLICATIONS Communication transmit channel W-CDMA base stations, multicarrier base stations, direct IF synthesis, wideband cable systems Instrumentation FUNCTIONAL BLOCK DIAGRAM 14-BIT DAC 2× FIR INTER- POLATION FILTER EDGE- TRIGGERED LATCHES CLOCK DISTRIBUTION AND MODE SELECT MUX CONTROL FILTER CONTROL 1×/2× 2×/4× 1× PLL CLOCK MULTIPLIER 1.2V REFERENCE AND CONTROL AMP AD9772A CLKCOM CLKVDD MOD0 MOD1 RESET PLLLOCK DIV0 DIV1 CLK+ CLK– DATA INPUTS (DB13 TO DB0) SLEEP DCOM DVDD ACOM AVDD REFLO PLLCOM LPF PLLVDD IOUTA IOUTB REFIO FSADJ ZERO- STUFF MUX Figure 1. GENERAL DESCRIPTION The AD9772A 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 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. 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 (that is, the high-pass response) while suppressing 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 option in which the data following the 2× interpolation filter is upsampled by a factor of 2 by inserting midscale data samples. The AD9772A can reconstruct full-scale waveforms with band- widths of up to 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. 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 can be fed into a transformer or a differential op amp topology to obtain a single-ended output voltage using an appropriate resistive load. 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. 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. |
Số phần tương tự - AD9772A-EB |
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Mô tả tương tự - AD9772A-EB |
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