wm9714l Wolfson Microelectronics plc, wm9714l Datasheet - Page 20

• Manufacturer Part Number: wm9714l
• Description: Ac?97 Audio Codec
• Manufacturer: Wolfson Microelectronics plc

WM9714L
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Figure 10 Clocking Architecture for WM9714L
INTERNAL CLOCK FREQUENCIES
The internal clock frequencies are defined as follows (refer to Figure 10):
Table 2 Clock Division Mode Table
AUXADC
The clock for the AUXADC nominally runs at 768kHz and is derived from BITCLK. The divisor for the
clock generator is set by PENDIV. This enables the AUXADC clock frequency to be set according to
power consumption and conversion rate considerations.
8ks/s voice and HIFI
8ks/s voice only (power save)
16ks/s voice and HIFI
16ks/s voice only (power save)
32ks/s voice and HIFI
48ks/s voice and HIFI
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AC97 CLK – nominally 24.576MHz, used to generate AC97 BITCLK at 12.288MHz.
HIFI CLK – for HIFI playback at 48ks/s HIFI CLK = 24.576MHz. See Table 2 for voice only
playback.
Voice DAC CLK – see Table 2 for sample rate vs clock frequency.
SAMPLE RATE
2.048MHz
2.048MHz
4.096MHz
4.096MHz
8.192MHz
12.288MHz
VOICE DAC CLK
FREQUENCY
24.576MHz
4.096MHz
24.576MHz
8.192MHz
24.576MHz
24.576MHz
FREQUENCY
HIFI CLK
PP, Rev 3.2, October 2008
Pre-Production
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