MAS3507D Micronas Intermetall, MAS3507D Datasheet - Page 5

• Manufacturer Part Number: MAS3507D
• Description: Mpeg 1/2 Layer 2/3 Audio Decoder
• Manufacturer: Micronas Intermetall

PRELIMINARY DATA SHEET
MPEG 1/2 Layer 2/3 Audio Decoder
Release Note: Revision bars indicate significant
changes to the previous edition.
This data sheet applies to MAS 3507D version G10
and following versions.
1. Introduction
The MAS 3507D is a single-chip MPEG layer 2/3 audio
decoder for use in audio broadcast or memory-based
playback applications. Due to embedded memories,
the embedded DC/DC up-converter, and the very low
power consumption, the MAS 3507D is ideally suited
for portable electronics.
In MPEG 1 (ISO 11172-3), three hierarchical layers of
compression have been standardized. The most
sophisticated and complex, layer 3, allows compres-
sion rates of approximately 12:1 for mono and stereo
signals while still maintaining CD audio quality. Layer 2
(widely used in DVB, ADR, and DAB) achieves a com-
pression of 8:1 providing CD quality.
In order to achieve better audio quality at low bit rates
(<64 kbit/s per audio channel), three additional sam-
pling
(ISO 13818-3). The MAS 3507D decodes both layer 2
and layer 3 bit streams as defined in MPEG 1 and 2.
The multichannel/multilingual capabilities defined by
MPEG 2 are not supported by the MAS 3507D. An
extension to the MPEG 2 layer 3 standard developed
by FhG Erlangen, Germany sometimes referenced as
MPEG 2.5, for extremely low bit rates at sampling fre-
quencies of 12, 11.025, or 8 kHz is also supported by
the MAS 3507D.
Fig. 1–1: MAS 3507D block diagram
Micronas
MPEG 1/2
audio bit stream
/3/
/2/
CLKO
decoded output
CLKI
frequencies
are
Synthesizer
Serial Out
Serial In
Clock
MPEG frame sync
I
2
S
provided
MAS 3507D
RISC DSP Core
by
CRC error
MPEG 2
Converter
DC/DC
PIO
I
2
C
1.1. Features
– Serial asynchronous MPEG bit stream input (SDI)
– Parallel (PIO-DMA) Input
– Broadcast and multimedia operation mode
– Automatic locking to given data rate in broadcast
– Data request triggered by ’demand signal’ in multi-
– Output audio data delivered (in various formats) via
– Digital volume / stereo channel mixer / Bass / Treble
– Output sampling clocks are generated and con-
– Ancillary data provided via I
– Status information accessible via PIO pins or I
– “CRC Error” and “MPEG Frame Synchronization”
– Power management for reduced power consumption
– Low power dissipation (30 mW @ f
– Supply voltage range: 1.0 V to 3.6 V due to built-in
– Adjustable power supply supervision
– Power-off function
– Additional functionality achievable via download
mode
media mode
an I
trolled internally.
Indicators at Pins in serial input mode
at lower sampling frequencies
46 mW @ f
2.7 V)
DC/DC converter (1-cell/2-cell battery operation)
software (CELP voice Decoder, ADPCM encoder /
decoder)
2
S bus (SDO)
serial control
s
/8+5/
24 kHz, 86 mW @ f
/3/
/2/
2
C interface
MAS 3507D
s
s
> 24 kHz @
12 kHz,
2
C
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