2ch ADC & 2ch DAC with Cap-less 2Vrms I/O

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The AK4688 is a stereo audio CODEC. The integrated ADC and DAC interfaces accept up to 24-bit input/output data and support an asynchronous operation. The input range of the pre-amplifier, that supports line inputs, is adjustable by an external resistor. A ground referenced 2Vrms output with a 3.3V single power supply is achieved by an integrated charge pump, reducing external parts such as AC-coupling capacitors and mute circuits. The ADC block of the AK4688 achieves a dynamic range of 99dB, and the DAC block achieves a dynamic range of 105dB. The AK4688 is suitable for digital recording systems, digital TVs, Blu-ray recorders and Home theater systems.

Key Features

• Asynchronous ADC/DAC Operation

• Capless Stereo Pre-amplifier for Line Input/Output

• 24bit Stereo ADC

- 64x Oversampling

- Sampling Rate up to 48kHz

- Linear Phase Digital Anti-Alias Filter

- S/(N+D): 83dB

- Dynamic Range, S/N: 99dB

- Digital HPF for Offset Cancellation

• 24bit Stereo DAC

- 128x Oversampling

- Sampling Rate up to 192kHz

- 24bit 8 times Digital Filter

- S/(N+D): 95dB

- Dynamic Range, S/N: 105dB

- De-emphasis Filter

• High Jitter Tolerance

• External Master Clock Input:

256fs, 384fs, 512fs 768fs (fs=32kHz to 48kHz)

128fs, 192fs, 256fs 384fs (fs=64kHz to 96kHz)

128fs, 192fs (fs=128kHz to 192kHz)

• 2 Audio Serial I/F (PORT1, PORT2)

- Master/Slave mode (PORT1)

- I/F format

PORT1, 2: MSB, LSB justified (16/24 bit), I2S

• Hardware / I2C-bus Control

• Operating Voltage:

- Digital I/O and Charge Pump: 3.0V to 3.6V

- ADC Analog: 3.0V to 3.6V

- DAC Analog: 3.0V to 3.6V

• Package: 36pin QFN

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Block Diagram

Block Diagram

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