GENERAL DESCRIPTION

The AD1970 is a complete analog or digital-in, analog-out BTSC encoder which includes pilot-tone generation and subcarrier 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 baseband 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.

FEATURES

Complete BTSC encoder

Pilot tone generator

Includes subcarrier modulation

Channel separation: 30 dB

Bandwidth up to 14 kHz

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

I2C port for control of modes, effects, and parameters

Analog input performance

74 dB dynamic range

−72 dB THD + N

Digital input performance

87 dB dynamic range

−83 dB THD + N

Integrated op amps for analog inputs and outputs

Single-ended output reduces external part count

Integrated PLL generates all clocks from composite video,

48 kHz sample clock, or high speed master clock

Sync stripper to recover video clock from composite

video signal

Output level control for setting aural carrier deviation

Macrovision™-compliant

Dolby™ RF mode-compatible

48-pin LQFP plastic package

APPLICATIONS

Digital set top box

DVD player

DVD recorder