MAS3506D datasheet(4/52 Pages) MICRONAS

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MAS 3506D

PRELIMINARY DATA SHEET

Micronas

WorldSpace Broadcast Channel Audio Decoder

1. Introduction

The WorldSpace system is a satellite-based digital

radio service for direct-to-home transmission of digital

radio programs. The coverage areas of this service are

Africa, South America, and parts of Asia.

The MAS 3506D is the source decoder of Micronas’

StarMan chip set that is designed for the reception of

WorldSpace signals. The MAS 3506D extracts one

Service Component (SC) of an incoming digital World-

Space

Broadcast

Channel

(BC)

and

decodes

MPEG 1/2/2.5 Layer 31) encoded audio data con-

tained in the selected Service Component. The Ser-

vice Control Header (SCH) information from the

Broadcast Channel is accessible via the embedded

fast mode serial control interface. The MAS 3506D

provides digital audio data output in I2S and similar for-

mats. An embedded digital buffer-controlled loop

recovers the sampling frequency of the audio signal

and generates a synchronized 24.576 MHz clock sig-

nal which is used as an oversampling clock for D/A

converters. A block diagram of the MAS 3506D is

shown in Figure 1–2 on page 5.

1) MPEG 2.5 is a compatible extension of MPEG 2

audio, defined in ISO/IEC 13818-3.2 that covers

additionally very low sampling frequencies down to

8kHz.

1.1. Features of the MAS 3506D

– Single-chip WorldSpace Broadcast Channel bit-

stream demultiplexer

– ISO MPEG 1/2/2.5 Layer 3 decoder

– ISO MPEG compliance tests passed

– Data processing by a high-performance RISC DSP

core (MASC)

– Download feature provides additional functionality

– Self-synchronized operation

– Output audio data delivered (in various formats) via

an I2S bus (SDO)

– Digital volume control and stereo channel mixer

– Automatic soft-mute function

– WorldSpace SCH-data output via I2C interface

– MPEG ancillary data provided via I2C interface

– Status information accessible via PIO pins or I2C

–“CRC Error”, “MPEG Frame Synchronization” and

“BC-Frame-Synchronization” indicators

– Power management for reduced power consump-

tion at lower sampling frequencies

– Low power dissipation (30 mW at fs

≤ 12 kHz,

46 mW at fs

≤ 24 kHz, 86 mW at fs > 24 kHz at

2.7 V)

– Supply voltage range: 2.7 V to 3.6 V

– Adjustable built-in DC/DC up-converter for one-cell

and two-cell battery operation (typically down to

Vbat =0.9 V)

– Adjustable power supply supervision

– Power-off function

1.2. System Overview

The Micronas StarMan chip set consists of the channel

decoder DRD 3515A and the MPEG Layer 3 audio

decoder MAS 3506D. All essential analog and digital

building blocks for WorldSpace reception are provided

by the chip set. Together with an L-band tuner and an

appropriate microcontroller this set creates a complete

StarMan radio receiver (Figure 1–1)

Fig. 1–1: Standard application of the StarMan chip set

Since the DRD 3515A also contains an audio amplifier

for headphone or small loudspeaker operation, only a

minimum of external components is necessary. The

additional inputs for analog signals (e.g. conventional

AM/FM receiver, tape etc.) make the amplifier accessi-

ble to these audio sources and thus considerably sim-

plify the design of complete radio receivers.

The analog audio output of the WorldSpace signal can

be connected to an external stereo amplifier for higher

power or quality. Also a digital audio signal in standard

I2S format is provided for high-end applications that

may require an external D/A converter.

AM/FM

Receiver,

Tape Player

WorldSpace

Tuner

System

Controller

DRD 3515A

MAS 3506D

Aux1/2

(analog)

IF input

I2S

SC-out

analog out

I2C

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