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AK4533

Audio Codec with Touch Screen Controller

Asahi Kasei Microdevices 

[ASAHI KASEI]

AK4533

Audio Codec with Touch Screen Controller

Featues

[ADC]

• 1ch mono16-bit ADC (For Microphone)

• 1st MIC Amplifier: 20dB Fixed Gain

• 2nd Amplifier: from -8dB to +27.5dB (0.5dB step)

• AGC function

• Analog Performance:

- S/N: 82dBA @ fs=44.1kHz, MIC_GAIN=20dB(AGC=off, 0dB)

[Sampling Frequency]

Audio : from 8kHz to 44.1kHz

[DAC]

• 2ch(stereo) DAC

• Single End output

• Digital Attenuator

• Analog Performance

- S/N: 88dBA@fs= 44.1kHz

[Touch Screen/Battery Check]

• SAR type A/D Converter: 12bit(10bit accuracy)

- S/H circuit

- 4-1 Multiplex (2ch :Touch Screen, 2ch : Check for the battery)

• Low Power Current: 20mA

• Low Voltage Operation

- Analog, Digital: 3.0V

• Small Package: 48pin LQFP

[General Description]

The AK4533 is audio codec with touch screen controller. The AK4533 incorporates several functions into one-chip; the

position detection of the touch screen, the measurement of battery voltage, the record of the voice, and the playback of audio

data.

The AK4533 has monaural A/D converter with AGC, and stereo D/A converter with digital attenuator. As codec can operate

from 8kHz to 44.1kHz, the AK4533 can playback the sound like MP3 with high quality. On-chip digital attenuator with 1.5dB

step can control DAC volume without the increase of CPU load. As AGC with 0.5dB step automatically controls voice input

level to the appropriate level, the voice can be recorded clearly. As the AK4533 also has on-chip 20dB fixed gain preamplifier

in addition to AGC, no other external preamplifier for microphone is required.

The AK4533 controls the voltages which are supplied to two pairs of electrode of touch screen. As the AK4533 also has

12bit/100kHz sampling SAR type A/D converter, it is possible to detect the pressed location by two A/D conversions. 12 bit

digital code is output through serial interface. The AK4533 also has 2 analog channels as the input of Touch Screen A/D

converter. The main purpose is for the measurement of the battery voltage.

As the AK4533 is small package, and can operate from 2.7V with low power consumption, it is suitable for mobile products,

especially PDA.

<Revision 0.9a>

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July 00

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