| The AK4753 is a two input, four output audio CODEC with integrated digital signal processing. The outputs can be configured either as single-ended or differential. An internal PLL allows the chip to run in master clock free mode. The digital signal processing block includes an ALC/limiter, 5 configurable biquads for EQ, volume control, and 4th-order filters for each output channel to enable a variety of configurations. Wide dynamic range is achieved with 96dB SNR for the ADC, and 103dB SNR for the DAC’s. A two-input 8-bit SAR ADC is integrated for processing of external potentiometers, supporting volume and bass control functions. A small external EEP-ROM is used to store the coefficient values for the DSP blocks. The AK4753 is controlled by an I2C control interface. |
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- Applications: Active Speakers, Potable Docking Stations
- Digital audio input interface
 · Data format: MSB-first, two’s complement
· 16, 20, or 24-bits, I2S, MSB justified, LSB justified, or DSP mode
· Audio sampling rates: 8kHz to 48kHz
- Analog audio input
· Single-ended input stereo audio ADC
· SNR: 96dB THD+N: 85dB
· Digital high-pass filter for DC-offset correction
- Analog audio output
· Four-channel 24-bit audio DAC
· Single-ended or differential output
· SNR: 103dB THD+N: 88dB
- 8-bit SAR ADC with two input selector
- Digital mixer for balancing inputs
- Digital signal processing block: DSP1, DSP2 independently
· Configurable ALC / limiter function
· Volume control: 0dB to -127dB, 0.5dB steps, mute
· Pre-gain setting: 0dB, +6dB, +12dB, +18dB
· Post-gain setting: 0dB, +3.5dB, +6dB, +8dB
· Five programmable biquads for EQ
· 4th-order high-pass filter or low-pass filter
- Integrated PLL for master clock-free operation
- PLL
· Input frequency: 24.576MHz, 24MHz, 22.5792MHz, 12.288MHz, 12MHz, and 11.2896MHz (XTI/MCKI pin)
· 1fs (LRCK pin)
· 32fs or 64fs (BICK pin)
· Input level: CMOS or AC-coupled (XTI/MCKI pin)
- Master clock input: 256fs, 512fs, 1024fs
 P I/F: I2C bus-slave (400kHz Fast-mode)- EEP-ROM control I/F: I2C bus-master (400kHz Fast-mode)
- Ta = -30 ~ +85°C
- Power supply:
Analog (AVDD): 3.0 ~ 3.6V (typ 3.3V)
Digital (DVDD: 3.0 ~ 3.6V (typ 3.3V)
- Package: 32 pin QFN (4 x 4 mm, 0.4mm pitch)
- Evaluation Board: AKD4753
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