Audio Processor for Advanced TV with

Sound IF Demodulator and Stereo Decoder

ADAV4622

Rev. Sp0

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FEATURES

Sound IF (SIF) processor

SIF demodulator and broadcast stereo decoder

NICAM (BG, DK, I, L), A2 (BG, DK, M), BTSC (M, N), EIAJ (M)

Automatic sound IF standard detection

Fully programmable 28-bit audio processor for enhanced

ATV sound—default TV audio flow loaded on reset

Implements Analog Devices and third-party branded audio

algorithms

Adjustable digital delay line for audio/video

Synchronization for up to 200 ms stereo delay

High performance 24-bit ADC and DAC

94 dB DNR performance on DAC channels

95 dB DNR performance on ADC channels

Dual headphone outputs with integrated amplifiers

High performance pulse-width modulation (PWM) digital

outputs

Multichannel digital baseband I/O

One 6-channel sample rate converter (SRC) and one

stereo SRC supporting input sample rates from

5 kHz to 50 kHz

S/PDIF output with S/PDIF input mux capability

Operates from 3.3 V (analog), 1.8 V (digital core), and 3.3 V

(digital interface)

Available in 80-lead LQFP

APPLICATIONS

General-purpose consumer audio postprocessing

Home audio

DVD recorders

Home theater in a box (HTIB) systems and DVD receivers

Audio processing subsystems for DTV-ready TVs

Analog broadcast capability for iDTVs

PRODUCT OVERVIEW

The ADAV4622 is an enhanced audio processor targeting

advanced TV applications with full support for digital and

analog baseband audio as well as multistandard broadcast SIF

demodulation and decoding.

The audio processor, by default, loads a dedicated TV audio

flow that incorporates full matrix switching (any input to any

output), automatic volume control that compensates for volume

changes during advertisements or when switching channels,

dynamic bass, a multiband equalizer, and up to 200 ms of stereo

delay memory for audio-video synchronization.

Alternatively, Analog Devices, Inc., offers an award-winning

graphical programming tool (SigmaStudio™) that allows custom

flows to be quickly developed and evaluated. This allows the

creation of customer-specific audio flows, including use of the

Analog Devices library of third-party algorithms.

The analog I/O integrates Analog Devices proprietary

continuous-time, multibit Σ-Δ architecture to bring a higher

level of performance to ATV systems, required by third-party

algorithm providers to meet system branding certification. The

analog input is provided by 95 dB dynamic range (DNR) ADCs,

and analog output is provided by 94 dB DNR DACs.

The main speaker outputs can be supplied as a digitally

modulated PWM stream to support digital amplifiers.

The ADAV4622 includes multichannel digital inputs and

outputs. In addition, digital input channels can be routed

through integrated sample rate converters (SRC), which are

capable of supporting any arbitrary sample rate from 5 kHz to

50 kHz.

Comprehensive documentation, which provides detailed

operation guidelines and register map information, is available

upon request from AV.Products@analog.com.

For more information on the ADAV4622, contact Analog Devices via email at AV.Products@analog.com.