Low Power 4ch ADC with ALC, MIC-Amp & PLL

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The AK5703 is a 4-channel 24-bit A/D converter with programmable microphone amplifiers and ALC (Automatic Level Control) circuit. It is designed for consumer microphone array applications. An integrated PLL operates from a wide variety of clocks, enabling high design flexibility. Microphone power outputs are included for biasing external microphones. Wide dynamic range is achieved, at 83dB with a microphone gain setting of +30dB. The AK5703 is packaged in a space-saving 28-pin QFN package.

Key Features

1.         Applications: Game Machine, PC, Phone / Video Conference System

2.       Recording Function

- 4-Channel ADC

- Full-differential or Single-ended Input

- Microphone Amplifier (+36dB/+30dB/+24dB/+18dB/+15dB/+12dB/+8dB/0dB)

- Input Voltage: 1.8Vpp@AVDD=3.0V (= 0.6 x AVDD)

- ADC Performance:

S/(N+D): 85dB, DR, S/N: 96dB@MGAIN=0dB, Single-ended Input

S/(N+D): 78dB, DR, S/N: 83dB@MGAIN=+30dB, Full Differential Input

- Digital HPF for DC-offset cancellation (fc=3.4Hz@fs=44.1kHz)

- Microphone Sensitivity Correction (+3dB ~ -3dB, 0.75dB Step)

- Digital ALC (Automatic Level Control)

- Input Digital Volume (+36dB ~ -52.5dB, 0.375dB Step, Mute)

- Programmable Output Data Delay

Delay Time: 0 to 64/64fs (1/64fs Step)

3.       Sampling Frequency:

- PLL Slave Mode (BICK pin): 8kHz ~ 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 Master/Slave Mode:

8kHz ~ 48kHz (256fs), 8kHz ~ 24kHz (512fs), 8kHz ~ 12kHz (1024fs)

4.       PLL Input Clock:

- MCKI pin:

27MHz, 26MHz, 24MHz, 19.2MHz, 13.5MHz, 13MHz, 12.288MHz, 12MHz,


- BICK pin: 32fs/64fs

5.       Master/Slave Mode

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

- 24/16-bit MSB justified, 24/16-bit I2S, TDM Mode

7.       mP I/F: 3-wire Serial Control or I2C Bus (Ver 1.0, 400kHz Mode)

8.       Power Supply:

- AVDD: 2.4 ~ 3.6V

- DVDD: 1.6 ~ 1.98V

- TVDD: 1.6 or (DVDD-0.2) ~ 3.6V

9.       Power Supply Current: 9.0mA (EXT Slave Mode)

10.    Ta = -30 ~ 85°C

11.    Package: 28pin QFN (4mm x 4mm, 0.4mm pitch)

12.    Evaluation Board: AKD5703


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Block Diagram

Block Diagram

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