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

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The AK4954A is a low power consumption 32-bit stereo CODEC with a microphone, a headphone and a 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 AK4954A is available in a small 32-pin QFN (4x4mm 0.4mm pitch), utilizing less board space than competitive offerings.

Key Features

1. Applications: IC Recorders, PMPs

2. Recording Function

· Two Low Noise MIC Power Supplies

· Stereo Single-ended input with three Selectors

· Low Noise MIC Amplifier (+26dB/+20dB/+13dB/+6dB/0dB)

· Digital ALC (Automatic Level Control)

(Setting Range: +36dB ~ -52.5dB, 0.375dB Step)

· ADC Performance: S/(N+D): 88dB, DR, S/N: 97dB (MIC-Amp=+20dB)

S/(N+D): 88dB, DR, S/N: 100dB (MIC-Amp=0dB)

· Two Types of Decimation Filters

· Overflow Detection

· Wind-noise Reduction Filter

· Stereo Separation Emphasis Circuit

· 5-band Notch Filter

· Digital MIC Interface

3. Playback Function

· Digital ALC (Automatic Level Control)

(Setting Range: +36dB ~ -52.5dB, 0.375dB Step)

· 3-band Dynamic Range Control Circuit

· Digital Volume Control (+6dB ~ -65.5dB, 0.5dB Step, Mute)

· Capacitor-less Stereo Headphone Amplifier

- HP-Amp Performance: S/(N+D): 65dB@20mW, S/N: 100dB

- Output Power: 20mW@16W

- Pop Noise Free at Power-ON/OFF

· Mono Speaker-Amplifier (with Stereo Line Output Switch)

- SPK-Amp Performance: S/(N+D): 70dB@250mW, Output Noise Level: -97dBV

- BTL Output

- Output Power: 400mW@8W (SVDD=3.3V)

100mW@8W (SVDD=1.5V)

· Beep Generator

4. Power Management

5. Master Clock:

(1) PLL Mode

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

32fs or 64fs (BICK pin)

(2) External Clock Mode

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

6. Sampling Frequencies

· PLL Slave Mode (BICK pin): 8kHz ~ 96kHz

· PLL Master Mode: 8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz, 96kHz

· EXT Master/Slave Mode: 8kHz ~ 96kHz (256fs), 8kHz ~ 48kHz (384fs),

8kHz ~ 48kHz (512fs), 8kHz ~ 12kHz (1024fs)

7. Master/Slave mode

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

· ADC: 16/24/32-bit MSB justified, 16/24/32-bit I2S

· DAC: 16/24/32-bit MSB justified, 16/24-bit LSB justified, 16/24/32-bit I2S

9. Serial mP I/F: I2C Bus (Ver 1.0, 400kHz Fast-Mode)

10. Ta = -30 ~ 85°C

11. Power Supply:

· Analog Power Supply (AVDD): 2.5 ~ 3.5V

· Digital Power Supply (DVDD): 1.6 ~ 1.98V

· Digital I/O Power Supply (TVDD): 1.6 or (DVDD-0.2) ~ 3.5V

· Speaker Power Supply (SVDD):  0.9 ~ 5.5V

12. Package: 32pin QFN (4 x 4mm, 0.4mm pitch)

13. Evaluation Board: AKD4954A


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