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AD71028

Analog Devices
Part Number AD71028
Manufacturer Analog Devices
Description Dual Digital BTSC Encoder
Published Jan 20, 2007
Detailed Description www.DataSheet4U.com Dual Digital BTSC Encoder with Integrated DAC AD71028 FEATURES 2 complete independent BTSC encoders...
Datasheet PDF File AD71028 PDF File

AD71028
AD71028

Overview
www.
DataSheet4U.
com Dual Digital BTSC Encoder with Integrated DAC AD71028 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 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.
APPLICATIONS Digital set-top box BTSC encoder FUNCTIONAL BLOCK DIAGRAM SERIAL INPUT A 3 SERIAL INPUT PLL DIVIDERS CLOCK DOUBLER BTSC ENCODER CORE A DAC CLOCK SIGNAL GROUP BTSC ENCODED OUTPUT A CLOCK DOUBLER PLL DIVIDERS SERIAL INPUT B SPI I/O GROUP 3 SERIAL INPUT BIAS BTSC ENCODER CORE B AN...


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