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AD995PCBZ датащи(PDF) 1 Page - Analog Devices |
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AD995PCBZ датащи(HTML) 1 Page - Analog Devices |
1 / 38 page 1 GSPS Quadrature Digital Upconverter w/18-Bit IQ Data Path and 14-Bit DAC PRELIMINARY TECHNICAL DATA AD9957 Rev. PrF 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 © 2006 Analog Devices, Inc. All rights reserved. FEATURES 1GSPS internal clock speed (up to 400MHz analog out) Integrated 1GSPS 14-bit DAC 250 MHz I/Q data throughput rate Phase noise ≤ –123 dBc/Hz (400 MHz carrier) Excellent dynamic performance >80 dB narrowband SFDR 8 Programmable Profiles for shift keying SIN(X)/(X) Correction (Inverse SINC filter) Reference Clock Multiplier Internal oscillator for a single crystal operation Software and hardware controlled power-down Integrated RAM Phase modulation capability Multichip synchronization Easy interface to Blackfin™ SPORT Interpolation factors from 4x to 252x Test tone circuitry Interpolation DAC Mode Gain control DAC Internal divider allows references up to 2 GHz 1.8V & 3.3V Power Supplies 100 Lead TQFP package APPLICATIONS HFC Data, Telephony & Video Modems Wireless Base Station Transmission Broadband Communications Transmissions Internet Telephony GENERAL DESCRIPTION The AD9957 functions as a universal I/Q modulator and agile upconverter for communications systems where cost, size, power consumption and dynamic performance are critical. The AD9957 integrates a high speed Direct Digital Synthesizer (DDS), a high performance, high speed 14-bit digital to analog converter (DAC), clock multiplier circuitry, digital filters and other DSP functions onto a single chip. It provides for base band up-conversion for data transmission in a wired or wireless communications system. The AD9957 is the third offering in a family of a quadrature digital upconverters (QDUCs), which includes the AD9857 and AD9856. It offers performance gains in operating speed, power consumption and spectral performance. Unlike its predeces- sors, it also supports a 16-bit serial input mode for I/Q base band data. The device can alternatively be programmed to op- erate as a single-tone sinusoidal source or as an interpolating DAC. The Reference Clock input circuitry includes a crystal oscillator, a high speed divide-by-two input, and a low noise PLL for mul- tiplication of the reference clock frequency. The user interface to the control functions includes a serial port easily configured to interface to the SPORT of the Blackfin DSP and profile pins which enable fast and easy shift keying of any signal parameter (phase, frequency, and amplitude). Figure 1: Basic Block Diagram |
Аналогичный номер детали - AD995PCBZ |
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Аналогичное описание - AD995PCBZ |
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