AK4953AEN

Low Power 24-Bit 2ch ADC & 2ch DAC with ALC/Eq and MIC/HP/SPK-Amp

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Description

The AK4953A is a low power consumption 24bit stereo CODEC with a microphone, headphone and speaker amplifiers. The input circuits include a microphone amplifier and an ALC (Automatic Level Control) circuit, and the output circuits include a cap-less headphone amplifier and a speaker amplifier. It is suitable for portable application with recording/playback function. The integrated charge pump circuit generates a negative voltage and removes the output AC coupling capacitors. The speaker amplifier has a wide operating voltage range, which is from 0.9V to 5.5V, enabling a direct drive to batteries. The AK4953A is available in a small 36pin QFN (5x5mm 0.4mm pitch), utilizing less board space than competitive offerings.

Key Features

1. Recording Function

• Stereo Single-ended input with three Selectors

• MIC Amplifier (+29dB/+26dB/+23dB/+20dB/+16dB/+12dB/0dB)

• Digital ALC (Automatic Level Control)

(Setting Range: +36dB to -54dB, 0.375dB Step)

• ADC Performance: S/(N+D): 82dB, DR, S/N: 88dB (MIC-Amp=+20dB)

S/(N+D): 85dB, DR, S/N: 96dB (MIC-Amp=0dB)

• Wind-noise Reduction Filter

• 5 Band Notch Filter

• Digital MIC Interface

2. Playback Function

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

• Digital ALC (Automatic Level Control)

(Setting Range: +36dB to -54dB, 0.375dB Step)

• Digital Volume Control (+12dB to -115dB, 0.5dB Step, Mute)

• Capacitor-less Stereo Headphone Amplifier

- HP-Amp Performance: S/(N+D): 80dB@24mW, S/N: 96dB

- Output Power: 24mW@16Ω

- Pop Noise Free at Power-ON/OFF

• Mono Speaker-Amplifier

- SPK-Amp Performance: S/(N+D): 70dB@250mW, S/N: 95dB

- BTL Output

- Output Power: 400mW@8Ω (SVDD=3.3V)

100mW@8Ω (SVDD=1.5V)

• Beep Generator

3. Power Management

4. Master Clock:

(1) PLL Mode

• Frequencies: 11.2896MHz, 12MHz, 13.5MHz, 24MHz, 27MHz (MCKI pin)

32fs or 64fs (BICK pin)

(2) External Clock Mode

• Frequencies: 256fs, 384fs, 512fs or 1024fs (MCKI pin)

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

• PLL Slave Mode (BICK pin): 7.35kHz to 96kHz

• PLL Slave Mode (MCKI pin): 7.35kHz, 8kHz, 11.025kHz, 12kHz, 14.7kHz, 16kHz, 22.05kHz, 24kHz, 29.4kHz, 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz, 96kHz

• PLL Master Mode: 7.35kHz, 8kHz, 11.025kHz, 12kHz, 14.7kHz, 16kHz, 22.05kHz, 24kHz, 29.4kHz, 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz, 96kHz

• EXT Master/Slave Mode: 7.35kHz to 96kHz (256fs), 7.35kHz to 48kHz (384fs),

7.35kHz to 48kHz (512fs), 7.35kHz to 12kHz (1024fs)

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

7. Master/Slave mode

8. Audio Interface Format: MSB First, 2’s complement

• ADC: 24bit MSB justified, 16/24bit I2S

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

9. Ta = -30 to 85°C (SPK-Amp = OFF)

Ta = -30 to 70°C (SPK-Amp = ON)

10. Power Supply:

• Analog Power Supply (AVDD): 2.85 to 3.5V

• Digital Power Supply (DVDD): 1.6 to 2.0V

• Digital I/O Power Supply (TVDD): DVDD to 3.5V

• Speaker Power Supply (SVDD): 0.9 to 5.5V

11. Package: 36pin QFN (5 x 5mm, 0.4mm pitch)

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Block Diagram

Block Diagram

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