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