AK4642EN

Low Power 2ch ADC & 2ch DAC with ALC/Eq and MIC/HP/SPK-Amp

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  • Evaluation Board Manual
  • Data Sheet

Description

The AK4642 features a 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 that is suitable for portable application with recording/playback function. The AK4642 is available in a 32pin QFN, utilizing less board space than competitive offerings.

Key Features

1. Recording Function

• Stereo Mic Input (Full-differential or Single-ended)

• Stereo Line Input

• MIC Amplifier (+32dB/+26dB/+20dB or 0dB)

• Digital ALC (Automatic Level Control)

(+36dB to -54dB, 0.375dB Step, Mute)

• ADC Performance: S/(N+D): 83dB, DR, S/N: 86dB (MIC-Amp=+20dB)

S/(N+D): 88dB, DR, S/N: 95dB (MIC-Amp=0dB)

• Wind-noise Reduction Filter

• Stereo Separation Emphasis

2. Playback Function

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

• Digital Volume (+12dB to -115.0dB, 0.5dB Step, Mute)

• Digital ALC (Automatic Level Control)

(+36dB to -54dB, 0.375dB Step, Mute)

• Stereo Separation Emphasis

• Stereo Line Output

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

• Stereo Headphone-Amp

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

- Output Power: 62mW@16Ω (HVDD=3.3V)

- Pop Noise Free at Power ON/OFF

• Mono Speaker-Amp

- S/(N+D): 50dB@240mW, S/N: 90dB

- BTL Output

- Availbable for both Dynamic and Piezo Speaker

- Output Power: 400mW@8Ω (HVDD=3.3V)

3.0Vrms@50 (HVDD=5V)

• Analog Mixing: Mono Input

3. Power Management

4. Master Clock:

(1) PLL Mode

• Frequencies:

11.2896MHz, 12MHz, 12.288MHz, 13.5MHz, 24MHz, 27MHz (MCKI pin)

1fs (LRCK pin)

32fs or 64fs (BICK pin)

(2) External Clock Mode

• Frequencies: 256fs, 512fs or 1024fs (MCKI pin)

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

6. Sampling Rate:

• PLL Slave Mode (LRCK pin): 7.35kHz to 48kHz

• PLL Slave Mode (BICK pin): 7.35kHz to 48kHz

• PLL Slave Mode (MCKI pin):

8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz

• PLL Master Mode:

8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz

• EXT Slave Mode:

7.35kHz to 48kHz (256fs), 7.35kHz to 26kHz (512fs), 7.35kHz to 13kHz (1024fs)

7. µP I/F: 3-wire Serial, I2C Bus (Ver 1.0, 400kHz High Speed Mode)

8. Master/Slave mode

9. Audio Interface Format: MSB First, 2’s compliment

• ADC : 16bit MSB justified, I2S

• DAC : 16bit MSB justified, 16bit LSB justified, 16-24bit I2S

10. Ta = -30 to 85°C (SPK-Amp=OFF)

-30 to 70°C (SPK-Amp=ON)

11. Power Supply:

• AVDD, DVDD: 2.6 to 3.6V (typ. 3.3V)

• HVDD: 2.6 to 5.25V (typ. 3.3V/5.0V)

12. Package: 32pin QFN (5mm x 5mm, 0.5mm pitch)

13. Register Upper-Compatible with Mono CODEC (AK4536/4630/4631)

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Block Diagram

Block Diagram

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