ASAHI KASEI
[AK4571]
AK4571
USB Interface Audio CODEC
Features:
General Description:
USB Audio Controller
The AK4571 is a USB Interface audio CODEC. The AK4571
incorporates a 16-bit CODEC, PLLs, USB transceiver, SIE (serial
interface engine), audio class processing unit, FIFO and other
required signals into a single chip. The AK4571 can
simultaneously transmit and receive audio stream data through
USB bus. In addition to this, the single-channel ADC and 2-
channel DAC can operate at different sampling rates.
12 Mbps bit rate
USB Serial Interface Engine (SIE)
Audio Class Processing Block
4 Endpoints
USB transceiver
16bit CODEC
- Single-channel A/D Converter
Microphone Pre-Amp (Fixed Gain: 20dB)
Mute/Volume Control
Programmable Gain Control
+24dB to –31dB ( 1dB step )
- D/A Converter
The AK4571 has a programmable gain amplifier for analog input
(IPGA). The gain range is from –31dB to +24dB with 1dB steps. In
addition to the IPGA, the AK4571 also has a fixed +20dB
pre-amplifier. Analog input signals can be mixed directly with the
D/A signal and sent to the LINEOUT pins of the chip.
2 channels
- Mixer
The analog outputs of the AK4571 can be attenuated up to
–47dB in 1dB steps. The AK4571 also has an analog bass boost
circuit. Bass Boost response can be modified by changing the
values of external resistors and capacitors.
Mute/Attenuation Control
+0dB to –47dB ( 1dB step )
Analog Bass Boost
The AK4571 has a Human Interface Device function that allows a
user to control the playback volume at the device side. The
playback volume on mixer applet moves up or down automatically
by the operation of HID buttons. The AK4571 also can mute
analog input signal locally in addition to mixer applet control.
HID Support
remote control of playback volume/mute
recording mute/status function
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Power Management
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control of external headphone amplifier
low power at suspend mode (< 1uA)
The AK4571 has advanced power management capabilities.
Suspend current is less than 1uA. The AK4571 can also control
the power of an external headphone amplifier to conform to the
USB suspend current requirement of 500uA maximum.
EEPROM Interface (Microwire Interface)
- can read Device/String Descriptor from EEPROM
- 1K/2K/4K bit EEPROM
The AK4571 has a Microwire interface for an external
EEPROM, allowing customization of Vendor ID and product ID.
On-chip PLL
7 sampling frequencies:
8kHz, 11.025kHz, 16kHz, 22.05kHz, 32kHz,
44.1kHz, 48kHz
The high integration of the AK4571 reduces both the number of
external components required and the PCB area required to build
USB devices, including small format products such as USB
headsets.
Single Power Supply, Low Power
+3.3Volts±0.3V
Package
48pin LQFP
MS0153-E-03
2005/06
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AKM [ ASAHI KASEI MICROSYSTEMS ]
