Outline

The YSS944 (ADAMB-f)/YSS943 (ADAMB-b)/YSS940 (ADAMB-nd) is an audio decoding digital signal processor that integrates onto a single chip the various digital signal processing functions required for AV amplifiers, etc. It includes an advanced 32-bit floating-point DSP and is able to decode a variety of audio formats.

„ Features

•  Supports various types of decoding up to 7.1 channels (5.1/6.1/7.1 channels selectable).

•  5.1-channel decoding of Dolby Digital (AC-3), DTS, AAC.

•  6.1-channel decoding of Dolby Digital EX, DTS-ES.

•  DTS 96/24 decoding and audio interface clock division/switching functions.

•  Dolby Pro Logic IIx and DTS Neo:6 decoding

•  Tone control and bass management functions

•  Function modification/expansion by downloading firmware to on-chip memory

•  Lip-sync function that enables synchronization of voice and video with variable voice delay

•  Supports sampling frequencies up to 192 kHz during PCM playback.

•  1/2 down sampling function when two PCM channels are played back

•  Dolby Digital/DTS/AAC decode information output function (can be read by microprocessor)

•  High-speed/high-accuracy operation by 32-bit floating-point DSP

    Operating frequency:  180 MHz (178.176 MHz)

    Data bus width:  32 bits (24-bit mantissa and 8-bit exponent)

    Multiplier/adder: 32 bits ×32 bits + 55 bits →55 bits (47-bit mantissa and 8-bit exponent)

•  No external memory needed (external memory is used when delay is increased.)

•  Eight general I/O ports

•  On-chip PLL for generation of high-speed internal operating clock

•  Supply voltage: 1.2 V (core block) and 3.3 V (pin block)

•  Low power consumption: about 210 mW (standard value during Dolby Digital decoding)

•  Si-gate CMOS process

•  Lead-free plating LQFP144 package (YSS944-VZ, YSS943-VZ, and YSS940-VZ)

„ Applications

•  AV amplifiers for home theaters

•  Car audio systems