GENERAL DESCRIPTION

The AK4538 targeted at PDA and other low-power, small size applications. It features a 16-bit stereo CODEC with a built-in Microphone-Amplifier, Headphone-Amplifier and Speaker-Amplifier. Input circuits include a Microphone-Amplifier and an ALC (Auto Level Control) circuit. The AK4538 is available in a 52-QFN, utilizing less board space than competitive offerings.

FEATURES

1. Resolution : 16bits

2. Recording Function

• 1ch Mono Input

• 1st MIC Amplifier : +20dB or 0dB

• 2nd Amplifier with ALC : +27.5dB ~ -8dB, 0.5dB Step

• ADC Performance : S/(N+D) : 79dB, DR, S/N : 83dB

3. Playback Function

• Digital De-emphasis Filter (tc=50/15ms, fs=32kHz, 44.1kHz, 48kHz)

• Digital Volume (0dB ~ -127dB, 0.5dB Step, Mute)

• Stereo Line Output

- Performance : S/(N+D) : 88dB, S/N : 92dB

• Headphone-Amp

- S/(N+D) : 70dB, S/N : 90dB

- Output Power : 15mW@16W (HVDD=3.3V)

• Mono Speaker-Amp with ALC

- S/(N+D) : 64dB, S/N : 90dB

- BTL Output

- Output Power : 300mW@8W (HVDD=3.3V)

• Mono and Stereo Beep Inputs

• AUX Input

• Mono Output

4. Power Management

5. Master Clock

(1) PLL Mode

• Frequencies : 11.2896MHz, 12MHz and 12.288MHz

• Input Level : CMOS

(2) External Clock Mode

• Frequencies : 1.792MHz ~ 12.288MHz

6. Output Master Clock Frequencies : 32fs/64fs/128fs/256fs

7. Sampling Rate

(1) PLL Mode

• 8kHz, 11.025kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz

(2) External Clock Mode

• 7kHz ~ 48kHz

8. Control mode: 4-wire Serial / I2C Bus

9. Master/Slave mode