2Ch ADC with USB I/F

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The AK5373 is a stereo A/D converter with a USB 2.0 interface. The device includes an integrated USB serial interface engine, a USB transceiver, an audio class processing block, endpoints, and a 24-bit stereo audio ADC. An integrated PLL enables the use of multiple sampling frequencies. A microphone amplifier and an integrated programmable gain amplifier are available for processing low-level signals from an analog microphone element. An external EEP-ROM is used to store the descriptor information. The AK5373 is housed in a 48-pin package. It is a low power device, operating from +3.3V, and consuming just 100mW in active mode and less than 100μA in suspend mode.

Key Features

• USB 2.0 compliant (full speed audio class)

• USB audio controller

USB serial interface engine

Audio class encoder/decoder

• USB synchronization

Synchronous type (synchronize with 1ms SOF)

• 24-bit stereo A/D converter with mute control

S/(N+D) = 85dB, S/N = 91dB (AVDD=3.3V, MIC-Amp = 0dB)

S/(N+D) = 70dB, S/N = 78dB (AVDD=3.3V, MIC-Amp = +30dB)

• Microphone amplifier gain:

0dB, +6dB, +12dB, +18dB, +24dB, +30dB, +36dB

• Digital programmable gain: +24dB to -31dB, 1dB Step

• Integrated PLL supports standard sampling frequencies

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

• EEP-ROM interface for descriptors

• External Digital Audio Interface

• Power Management

• Low power consumption

30mA in active mode

Less than 100µA in suspend mode

• Power Supply:

Analog Power Supply (AVDD): 3.0 to 3.6V

Digital Power Supply (DVDD): 3.0 to 3.6V

• Ta = -10 to +70°C

• Package: 48pin LQFP (7 x 7 mm, 0.5mm pitch)

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Block Diagram

Block Diagram

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