ak4651 AKM Semiconductor, Inc., ak4651 Datasheet - Page 21

• Manufacturer Part Number: ak4651
• Description: 16bit ?? Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
Sample Rate for DAC and ADC is controlled by register 2CH and 32H, respectively. 16bit data in D15(MSB) to D0 show
unsigned value from 0 to 65535, representing the exact sampling frequency in Hz. These sample rate setting is done at
VRA bit = “1” of Extended Audio Status and Control Register(2Ah).
The AK4651 supports these discrete frequencies. When any other codes is written in this register, the AK4651 operates at
the sampling rate rounded to the closest one in Table 4 by decoding only D15-12 bits. If D15-12 = 5H, the AK4651
operates at 22.05kHz or 24kHz when D11 = “0” or “1”, respectively (Table 5).
At VRA bit = “0”, 2CH and 32H are fixed to “BB80H” and cannot be written. When VRA bit is set to “0”, 2CH and 32H
register are set to “BB80H” automatically.
And the change of sample rate will be executed on the fly.
MS0503-E-00
Audio Sample Rate
D15 – D12
9H,AH
BH-FH
0H,1H
7H,8H
2H
3H
4H
5H
6H
Sample Rate (kHz)
Table 5. Audio Sample Rate (x: Don’t care)
11.025
22.05
16.0
24.0
32.0
44.1
48.0
8.0
Table 4. Audio Sample Rate
D11
x
x
x
x
0
1
x
x
x
x
- 21 -
Data in D15 – D0
5DC0H
AC44H
BB80H
7D00H
1F40H
2B11H
3E80H
5622H
Sample Rate (kHz)
11.025
22.05
22.05
16.0
24.0
24.0
32.0
44.1
48.0
8.0
[AK4651]
2006/04