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AD71028JST PDF预览

AD71028JST

更新时间: 2024-11-04 04:04:15
品牌 Logo 应用领域
亚德诺 - ADI 编码器
页数 文件大小 规格书
20页 435K
描述
Dual Digital BTSC Encoder with Integrated DAC

AD71028JST 数据手册

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Dual Digital BTSC Encoder  
with Integrated DAC  
AD71028  
PRODUCT OVERVIEW  
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  
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 ADIs patented multibit Σ-∆ DAC  
architecture. This architecture provides 92 dB SNR and THD+N  
of –92 dB.  
APPLICATIONS  
Digital set-top box BTSC encoder  
FUNCTIONAL BLOCK DIAGRAM  
3
SERIAL  
INPUT A  
SERIAL  
INPUT  
BTSC  
ENCODER  
PLL DIVIDERS  
CORE A  
BTSC  
ENCODED  
OUTPUT A  
CLOCK  
DOUBLER  
DAC  
CLOCK  
SIGNAL  
GROUP  
ANALOG  
BIAS  
BIAS  
CLOCK  
DOUBLER  
BTSC  
ENCODER  
CORE B  
PLL DIVIDERS  
SPI PORT  
BTSC  
ENCODED  
OUTPUT B  
DAC  
SERIAL  
INPUT  
3
SERIAL  
INPUT B  
4
CONTROL REGISTERS  
PARAMETER RAM  
SPI I/O  
GROUP  
AD71028  
Figure 1. Functional Block Diagram  
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  
Fax: 781.326.8703  
www.analog.com  
© 2004 Analog Devices, Inc. All rights reserved.  
 

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