ASAHI KASEI
[AK5370]
AK5370
Features:
USB I/F A/D Converter
n
Incorporates USB Audio Controller
USB Serial Interface Engine
Audio Class Encoder/Decoder
2 Endpoints (FIFO)
USB transceiver
n
16 bit A/D Converter
1 channel
Mute/Volume Control
AGC pin for external control
A/D S/N: 84dBA (44.1kHz, Gain = 0dB)
n
On-chip PLL
5 Sampling Frequencies support
8kHz, 11.025kHz
22.05kHz, 44.1kHz, 48kHz
n
Programmable Gain Amplifier
+20dB to –58dB
n
Single Power Supply, Low Power
+3.3Volts±10%
n
Package
24pin VSOP
General Description
The AK5370 is AD converter for USB audio, especially
USB microphone .
The AK5370 integrates USB serial
interface engine, USB transceiver, audio class decoder,
endpoints, and high quality AD converter into t he chip.
As the AK5370 incorporates PLL, it can support several
sampling frequencies, 8kHz, 11.025kHz, 22.05kHz, 44.1kHz,
and 48kHz with only one crystal. Moreover, the AK5370
integrates volume control, and mute function.
It is possible to make USB microphone with a few external
components
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
VA
VCOM
AGND AGC AGCEN VD
DGND
String ROM
MIC_BIAS
Common Voltage
Mute
&
Volume
control
Audio Class
Decoder
Audio Class
Encoder
EndPoint1
IN_FIFO
adCLK
ConfigROM
Power
Management
EndPoint0
OUT_FIFO
EndPoint0
IN_FIFO
Serial
Interface
Engine
Testmode1,2
System
CLK
TEST1,2,3
MIC_IN
-
+
-
+
16bit
ADC
PLL
AMP1O
AMP2I
AMP2O
XTLIN
LFLT2
CRYSTAL
USB
Transceiver
XTLOUT
DP
DN
VREF
LFLT1
RST
MS0027-E-00
1
2000/05
AKM [ ASAHI KASEI MICROSYSTEMS ]
