AED30A

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