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M-NARA
(AED30A)
ULTRA LOW POWER
MPEG LAYER3
AUDIO ENC/DECODER
PRELIMINARY DATA SHEET
VER1.2(2003.2.26)
MOBILE DOCTOR Co.

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- INDEX -
1. GENERAL DESCRIPTION
2. FEATURES
3. FUNCTIONAL DESCRIPTIONS
4. EXTERNAL INTERFACE DESCRIPTIONS
5. FLOWCHART FOR SOFTWARE APPLICATIONS
6. PIN CONNECTIONS
7. APPLICATION NOTE
8. PACKAGE DIMENTION
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1. GENERAL DESCRIPTION
M-NARA(AED30A) is a ultra low power digital audio encoder/decoder, capable of encoding/decoding
ISO/IEC 11172-3 Layer III audio format. Fully hardwired design skill provides lower power consumption and
cost than any other chip using DSP. Thus, M-NARA is ideally suited for portable electronics.
For user convenience, various interfaces are supported. Host data reading/writing is executed with the serial
I2C I/F. With the serial I2S or 8bit PIO I/F, bit streams for encoding or decoding are transferred. The external
AD/DA are interfaced with the I2S format.
Easily accessible host interface has various functions and controls, such as software reset, digital volume
control, test mode, mute, interrupt, encoder/decoder status check, power down mode, ….
M-NARA has the capability of voice recoding/decoding with MPEG2 LAYER III algorithm(16kHz sampling
freq. 8~32kbps mono). At that time, the external MCU doesn’t execute any operation. The voice signal from
ADC is compressed and transmitted to external memory through I2S or parallel PIO interface.
For minimum power consumption, the external MCU can power down the encoder/decoder. In typical
application, M-NARA is suitable for low power application in consumer digital audio system, multimedia and
digital system.
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2. FEATURES
MPEG 1/2 Audio layer 3 encoder/decoder single chip
Fully hardwired design for ultra low power and cost
Various user interface (I2C, I2S, PIO)
Host read/write access with I2C interface
16bits PCM data input/MP3 data output for encoder with I2C/I2S/PIO interface
MP3 data input for decoder with I2C/I2S/PIO interface
Internal PLL
12.288MHz single clock
Need not program download
Power down mode for reducing power consumption
Power consumption – normal mode (encoder : 8mA, decoder : 6mA )
3.3/2.5V power supply
64 pin TQFP
2.1 Encoder Features
Flexible encoding bit rate (MPEG1 : 32 ~ 320kbps, MPEG2 : 8 ~ 160kbps)
Various audio source input (music, voice, radio, audio line-in, 16bit PCM data)
Voice record/playback (16kHz sampling freq. 8~32kbps mono) function
MPEG1 layer3 format
32, 44.1, 48kHz 16-bit stereo ADC sampled data/16bits PCM data input
Flexible compression ratio(32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320kbps)
stereo/joint-stereo/mono encoded data serial/parallel output
For music application
MPEG2 layer3 format
16, 22.05, 24kHz 16-bit stereo ADC sampled data/wave file data input
Flexible compression ratio(8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160kbps)
stereo/joint-stereo/mono encoded data serial/parallel output
In case of 8Kbps case, only 16kHz mono encoding is possible.
For voice application(16kHz 8~32kbps mono encoding)
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2.2 Decoder Features
MPEG1/2 Layer3 bit stream decoder
8 steps tempo control
Digital volume control
Digital bass control
Digital treble control
Mute control
Ancillary data support
2.3 Typical Applications
Portable music player
Voice recorder
CD R/W recorder
VoIP
Sound card
Digital audio/video recorder
Mobile phone
PDA
Internet broadcasting system
Notebook PC
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