CS4351
4.4 De-Emphasis Control
The device includes on-chip digital de-emphasis. Figure 8 shows the de-emphasis curve for F equal to
s
44.1 kHz. The frequency response of the de-emphasis curve will scale proportionally with changes in sam-
ple rate, Fs.
Gain
dB
T1=50 µs
0dB
T2 = 15 µs
-10dB
F1
F2
Frequency
3.183 kHz
10.61 kHz
Figure 8. De-Emphasis Curve
Notes: De-emphasis is only available in Single-Speed Mode.
4.4.1 Stand-Alone Mode
When pulled to VL the DEM pin activates the 44.1 kHz de-emphasis filter. When pulled to GND
the DEM pin turns off the de-emphasis filter.
4.4.2 Control Port Mode
The Mode Control bits selects either the 32, 44.1, or 48 kHz de-emphasis filter. Please see section
6.2.2 for the desired de-emphasis control.
DS566PP2
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CIRRUS [ CIRRUS LOGIC ]
