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CS44800 Datasheet(PDF) 31 Page - Cirrus Logic

Part # CS44800
Description  8-Channel Digital Amplifier Controller
PDF  80 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS44800 Datasheet(HTML) 31 Page - Cirrus Logic

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DS632F1
31
CS44800
4.4.2
Auto Rate Detect
The CS44800 will automatically determine the incoming sample rate, DAI_LRCK, to master clock,
DAI_MCLK, ratio and configure the appropriate internal clock divider such that the sample rate convertor
receives the required clock rate. A minimum DAI_MCLK rate of 128Fs is required for proper operation.
The supported DAI_MCLK to DAI_LRCK ratios are shown in Table 1 on page 26.
4.4.3
De-Emphasis
The CS44800 includes on-chip digital de-emphasis filters. The de-emphasis feature is included to accom-
modate older audio recordings that utilize pre-emphasis equalization as a means of noise reduction.
Figure 23 shows the de-emphasis curve. The frequency response of the de-emphasis curve will scale pro-
portionally with changes in sample rate, Fs. The required de-emphasis filter for 32 kHz, 44.1 kHz, or
48 kHz is selected via the de-emphasis control bits in “Misc. Configuration (address 04h)” on page 52.
Gain
dB
-10dB
0dB
Frequency
T2 = 15 µs
T1=50 µs
F1
F2
3.183 kHz
10.61 kHz
Figure 23. De-Emphasis Curve



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