AK4571 Datasheet, PDF (14/54 Pages) Asahi Kasei Microsystems – USB I/F Audio CODEC

ASAHI KASEI
[AK4571]
2.
2.1.
AK4571 PLL
Endpoint
Isochronous
AK4571
USB SOF
SOF(1ms)
codec
IN Endpoint(A/D
2ms
44.1kHz
N Frame
44 samples
(N+1) Frame
44 samples
OUT Endpoint D/A
) Asynchronous Endpoint
2
10 1 45
(N+9) Frame
45 samples
Synchronous
USB
(N+10) Frame
44 samples
Figure 4 Synchronization Scheme
AK4571 2
A/D
D/A
A/D
AK4571 N
FIFO
1
FIFO
SOF
1SOF D/A
codec
D/A
FIFO
A/D
N+1
IN
D/A
IN transaction
SOF
PLL SOF
2.2.
USB
1) Low-power Bus-powered Devices (<100mA) 2) High-power Bus-powered Devices(>100mA
<500mA) 3) Self-powered Devices 3
AK4571
USB1.1
200uA
Low-power Bus-powered Devices
High-power Bus-powered Devices Bus-powered Hub
SUSPEND
500uA
Bus-powered Hub
D+
1.5kΩ
USB
a)
Resume
AK4571 2
ADC DAC
PLL
30ms
b)
USB
500uA
ON/OFF AK4571
MS0153-J-02
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