AD1970

Obsolete

Complete MTS (BTSC) TV Stereo Encoder

Data Sheet (Rev. 0) Product Selection Table

Viewing:

Overview

Complete BTSC encoder
Channel separation: 30 dB
Stereo analog or digital input
Phat-Stereo™ 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
Integrated PLL generates all clocks from composite video, 48 kHz sample clock, or high speed master clock

I²C port for control of modes, effects, and parameters x
Analog input performance
74 dB dynamic range
−72 dB THD + N
Digital input performance
87 dB dynamic range
−83 dB THD + N
Sync stripper to recover video clock from composite video signal
Output level control for setting aural carrier deviation

The AD1970 is an analog or digital in, analog out TV Stereo Digital Audio Processor with programmable MTS (BTSC) encoder which includes pilot-tone generation and sub-carrier mixing functions. The stereo ADC provides the means for digitization of the analog baseband audio signal. A built-in high performance DAC is provided to output the BTSC base-band composite signal. The output of the AD1970 can be connected with minimal external circuitry to the input of a 4.5 MHz aural FM modulator.

In addition to the digital BTSC encoder, the AD1970 includes a stereo image enhancement function, Phat Stereo, to increase the sense of spaciousness available from closely spaced TV loudspeakers. A dialog enhancement algorithm solves the problem of playing wide dynamic range sources over limited-performance TV speakers and amplifiers. An I²C port allows control of the AD1970’s registers and parameters.