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AD71028JSTRL Datasheet(PDF) 1 Page - Analog Devices |
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AD71028JSTRL Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page Dual Digital BTSC Encoder with Integrated DAC AD71028 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 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: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. FEATURES 2 complete independent BTSC encoders Pilot tone generator Includes subcarrier modulation Typical 23 dB to 27 dB separation, 16 dB minimum Signal bandwidth of 14 kHz Phat-StereoTM algorithm for stereo image enhancement Dialog enhancement function for playing wide dynamic range video sources over built-in TV speakers Includes L-R dual-band compressor SPI® port for control of modes and effects Differential output for optimum performance DAC performance: 92 dB dynamic range, –92 dB THD+N Output level control for setting aural carrier deviation Flexible serial data port with right-justified, left-justified, I2S compatible, and DSP serial port modes 48-lead LQFP plastic package APPLICATIONS Digital set-top box BTSC encoder PRODUCT OVERVIEW The AD71028 dual digital BTSC encoder provides two complete digital BTSC encoder channels, including the pilot-tone generation and subcarrier mixing functions. Two built-in high performance DACs are provided to output the BTSC baseband composite signal. The output of the AD71028 can be connected with minimal external circuitry to the input of a 4.5 MHz aural FM modulator. In addition to the BTSC encoders, the AD71028 also includes a stereo image enhancement function, Phat Stereo, to increase the sense of spaciousness available from closely spaced TV loudspeakers. A dialog enhancement algorithm is also included to solve the problem of playing wide dynamic range sources over limited-performance TV speakers and amplifiers. An extensive SPI port allows click-free parameter updates. The AD71028 also includes ADI’s patented multibit Σ-∆ DAC architecture. This architecture provides 92 dB SNR and THD+N of –92 dB. FUNCTIONAL BLOCK DIAGRAM SERIAL INPUT A SERIAL INPUT B SPI I/O GROUP SPI PORT PLL DIVIDERS PLL DIVIDERS SERIAL INPUT CLOCK DOUBLER CLOCK DOUBLER SERIAL INPUT CONTROL REGISTERS PARAMETER RAM BTSC ENCODER CORE A BTSC ENCODER CORE B BTSC ENCODED OUTPUT A BTSC ENCODED OUTPUT B ANALOG BIAS CLOCK SIGNAL GROUP DAC DAC BIAS 3 3 4 AD71028 Figure 1. Functional Block Diagram |
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