MP3 player on a chip from On Semi
ON Semiconductor, driving innovation in energy efficiency, has introduced a new MP3 capable device to support both record and playback in portable MP3 audio applications where there is a strong requirement for miniaturization, reduced bill of materials (BoM) and reduced cost. The LC823430TA audio processing system provides a single-chip solution by integrating digital signal processing (DSP) circuitry for MP3 encoding and decoding, and analog blocks such as audio analog-to-digital conversion (ADC) and digital-to-analog conversion (DAC).
The LC823430TA is a housed in space-saving 128-pin TQFP package with an overall height of just 1.2 mm maximum. The new device features segment-type LCD-connectable driver circuitry with two separate versions supporting either eight common by 18 segment (USB model) or four common by 36 segment (non-USB model) displays. Various flash memory interfaces such as SD/MMC and USB 2.0 device interface are also embedded within the design to provide further important space and BoM savings.
In addition to MP3 encoding and decoding, the LC823430TA’s embedded DSP provides a noise cancellation feature to enhance the audio quality of recorded data by eliminating background noise such as wind or HVAC noise. A variable speed playback function is also included to allow audio data to be played back faster or slower without changing pitch. Further embedded analog circuitry provides a speaker and microphone amplifier and a programmable gain amplifier (PGA) with digital auto level control (ALC) for more consistent playback.
ON Semiconductor has introduced an MP3 record and playback chip with almost everything needed in an audio device except flash memory.
The 16x16mm chip, dubbed LC823430TA audio processing system, has DSP for MP3 encode and decode, DACs and microphone pre-amps, and DACs and both speaker (300mW) and headphone drivers.
There are also interfaces for eSD and eMMC cards for flash bulk storage, USB2.0, and a segment-type LCD.
A second version of the chip sacrifices the USB for a more complex LCD capability.
“In addition to MP3 encoding and decoding, the LC823430TA’s embedded DSP provides a noise cancellation feature to enhance the audio quality of recorded data by eliminating background noise such as wind or air conditioning noise,” said On. “A variable speed playback function is also included to allow audio data to be played back faster or slower without changing pitch. Digital auto level control provides more consistent playback.”
Unusually, there is a separate real-time clock that runs with an external 32.738kHz crystal. This, and several of the analogue blocks, the USB phy and various SRAMs, are on isolated power domains and can be powered down through registers to cut power consumption.
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