| The AK4685 is a single chip CODEC that integrates 4-channel ADC, 2-channel DAC and a stereo capacitor less headphone amplifier. The converters are designed with an Enhanced Dual Bit architecture for the ADC, and an Advanced Multi-Bit architecture for the DAC’s, enabling very low noise performance and achieving wide dynamic range. The differential analog inputs and outputs cancel noise on analog signal lines. Therefore, a stable system can be designed. The AK4685 has a dynamic range of 102dB for ADC, 106dB for DAC. It is well suited for digital TV and home theater systems. |
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- Applications: AV Amplifiers, DVD Receivers, Stereo Systems and Digital TV’s
- Asynchronous ADC/DAC1/DAC2 Operation
- 4ch 24bit ADC
 - Differential Input
- 64x Oversampling
- Sampling Rate up to 48kHz
- Linear Phase Digital Anti-Alias Filter
- S/(N+D): 90dB
- Dynamic Range, S/N: 102dB
- Digital HPF for Offset Cancellation
- Channel Independent Digital Volume (+24/-103dB, 0.5dB/step)
- Soft Mute
- Two 2ch 24bit DAC’s
- Differential/Single-end Ouput (DAC1)
- 128x Oversampling
- Sampling Rate up to 192kHz
- 24bit 8 times Digital Filter
- S/(N+D): 92dB
- Dynamic Range, S/N: 106dB
- Channel Independent Digital Volume (+12/-115dB, 0.5dB/step)
- Soft Mute
- 40mW Capless Stereo Headphone Amplifier
- Output Power: 1.21Vrms @ 3.3V, THD+N(min) = -40dB
- Dynamic Range, S/N: 96dB
- Pop Noise Free at Power-ON/OFF and Mute
- Independent Mute Pins for 2 lines
- High Jitter Tolerance
- TTL Level Digital I/F
- External Master Clock Input:
- 256fs, 384fs, 512fs 768fs (fs=32kHz ~ 48kHz)
- 128fs, 192fs, 256fs 384fs (fs=64kHz ~ 96kHz)
- 128fs, 192fs (fs=120kHz ~ 192kHz)
- Audio Serial I/F (PORTA/B/C)
- Master/Slave mode (PORTB)
- I/F format: MSB justified, I2S
- I2C Bus
 P I/F for mode setting
- Operating Voltage:
- Digital Out: 3.0V ~ 5.25V,
- Digital In: 4.75V ~ 5.25V,
- Charge Pump: 3.0V ~ 3.6V,
- Analog: 4.75V ~ 5.25V
- Package: 64pinLQFP (0.5mm pitch)
- Evaluation Board: AKD4685
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