1
ASAHI KASEI
MS0103-E-00
MS0103-E-00
[AK5371]
2001/06
General Description
The AK5371 is stereo A/D converter with USB I/F. The
AK5371 integrates USB serial interface engine, USB
transceiver, audio class processing unit, endpoints, and high
quality 2 channel AD converter into the chip.

As the AK5371 incorporates PLL, it can support several
sampling frequencies, 8kHz, 11.025kHz, 22.05kHz, 44.1kHz,
and 48kHz with only one crystal. Moreover, the AK5371
integrates volume control, and mute function.
Not only power consumption at normal operation is very
low, but also the current at suspend mode is less than 1µA.
The AK5371 includes 20dB fixed gain pre-amplifier. In
addition to this, as the AK5371 also incorporates IPGA which
can amplify the microphone signal up to +24dB, total gain is
44dB maximum.
The AK5371 has EEPROM I/F for customizing Device
Descriptor and String Descriptor. By connecting 1K bit, 2K
bit, or 4Kbit Microwire
TM
type EEPROM, the AK5371 can
customize Vendor ID, Product ID in Device Descriptor, and
String Descriptor.
This device is good for not only business application such as
conferencing but also games, voice recognition, and Karaoke.
Related Documents
For the detail of USB specification, and Audio Class, please
refer to the following documents.
Universal Serial Bus Specification Revision 1.1
Universal Serial Bus Device Class Definition for Audio
Devices, Revision 1.0
Features:
square6 USB-IF Certified
square6 Incorporates USB Audio Controller
USB Serial Interface Engine
Audio Class Encoder/Decoder
2 Endpoints (FIFO)
USB transceiver

square6 16 bit A/D Converter
2 channels
Mute/Volume Control
A/D S/N: 84dBA (44.1kHz, Gain = 0dB)
square6 Low Power Dissipation
Normal Operation: 26mA
Suspend Mode: < 1uA
square6 Programmable Gain Amplifier (IPGA)
+24dB to –31dB @1dB Step
square6 20dB Pre-amplifier
square6 On-chip PLL
5 Sampling Frequencies support
8kHz, 11.025kHz
22.05kHz, 44.1kHz, 48kHz
square6 EEPROM I/F
can customize Device Descriptor,
and String Descriptor
square6 Single Power Supply, Low Power
+3.3±0.3 Volts

square6 Package
48pin LQFP
AK5371
2ch A/D Converter with USB I/F