AK4951EG

Description

The AK4951 is a low power 24-bit stereo CODEC with a microphone, headphone and speaker amplifiers. The AK4951 supports sampling frequency from 8kHz to 48kHz. It is suitable for a wide range of application from speech signal processing for narrowband, wideband and super wideband to sound signal processing for audio band. The input circuits include a microphone amplifier, an automatic wind noise reduction filter of the proprietary algorithms and a high performance digital ALC (automatic level control) circuit, therefore the AK4951 can record with high-quality sound regardless of whether indoors or outdoors. In addition, the output circuits include a cap-less headphone amplifier with a negative voltage generated by charge pump circuit and a speaker amplifier with 1W output power. It is suitable for various products as well as portable applications with recording/playback function.

The AK4951 are available in a small 32-pin QFN (4mm x 4mm, 0.4mm pitch: AK4951AEN) and a 32-pin BGA (3.5mm x 3.5mm, 0.5mm pitch: AK4951EG) packages saving mounting area on the board.

· Applications: IP Cameras, Digital Cameras, IC Recorders, Tablets, Wireless Headphones, Headsets

1. Recording Functions

• Analog Input

(AK4951AEN) 3 Stereo Single-ended inputs with Selectors

(AK4951EG) 2 Stereo and 1 Monaural Single-ended inputs with Selectors

• Microphone Amplifier: +30dB ~ 0dB, 3dB Step

• Microphone Power Supply: 2.0V or 2.4V, Noise Level= −108dBV

• Digital ALC (Automatic Level Control)

- Setting Range: +36dB ~ −52.5dB, 0.375dB Step & Mute

• ADC Performance: S/(N+D): 83dB, DR, S/N: 88dB (MIC-Amp=+18dB)

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

• Microphone Sensitivity Correction

• Automatic Wind Noise Reduction Filter

• 5-Band Notch Filter: Include Dynamic Gain Control

• Stereo Separation Emphasis Circuit

• Digital Microphone Interface

2. Playback Functions

• Digital ALC (Automatic Level Control)

- Setting Range: +36dB ~ −52.5dB, 0.375dB Step & Mute

• Sidetone Mixer & Volume Control (0dB ~ −18dB, 6dB Step)

• Digital Volume Control

- +12dB ~ −89.5dB, 0.5dB Step & Mute

• Capacitor-less Stereo Headphone Amplifier

- HP-Amplifier Performance: S/(N+D): 75dB@20mW, S/N: 97dB

- Output Power: 20mW@16Ω

- Pop Noise Free at Power-ON/OFF

• Mono Speaker Amplifier (with Stereo Line Output Switch)

- Speaker Amplifier Performance: S/(N+D): 75dB@250mW, S/N: 99dB

- BTL Output

- Output Power:

(AK4951AEN) 400mW@8Ω (SVDD=3.3V), 1W@8Ω (SVDD=5V)

(AK4951EG) 400mW@8Ω (AVDD=3.3V)

• Analog Mixing: BEEP Input

3. Power Management

4. 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)

5. Sampling Frequencies

• PLL Master Mode:

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

• PLL Slave Mode (BICK pin): 8kHz ~ 48kHz

• EXT Master/Slave Mode:

8kHz ~ 48kHz (256fs, 384fs, 512fs), 8kHz  24kHz (1024fs)

6. Master/Slave Mode

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

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

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

8. µP I/F:

(AK4951AEN) I2C Bus (Ver 1.0, 400kHz Fast-Mode)

(AK4951EG) 3-wire Serial, I2C Bus (Ver 1.0, 400kHz Fast-Mode)

9. Operating Temperature: Ta = −40 ~ 85°C

10. Power Supply

(AK4951AEN)

• Analog Power Supply (AVDD): 2.8 ~ 3.5V

• Speaker Power Supply (SVDD): 1.8 ~ 5.5V

• Digital & Headphone Power Supply (DVDD): 1.6 ~ 1.98V

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

(AK4951EG)

• Analog & Speaker Power Supply (AVDD): 2.8 ~ 3.5V

• Digital & Headphone Power Supply (DVDD): 1.6 ~ 1.98V

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

11. Package:

(AK4951AEN)

• 32-pin QFN (4 x 4 mm, 0.4mm pitch)

(AK4951EG)

• 32-pin BGA (3.5 x 3.5 mm, 0.5mm pitch)

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Block Diagram

Description

Key Features

Block Diagram