CS4270 Datasheet, PDF (38/48 Pages) Cirrus Logic – 24-Bit, 192 kHz Stereo Audio CODEC

CS4270
8.5.4 De-Emphasis Control (Bit 0)
Function:
Implementation of the standard 50/15 µs digital de-emphasis filter on the DAC output requires reconfigu-
ration of the digital filter to maintain the proper filter response for 44.1 kHz sample rate. Figure 18 shows
the filter response. NOTE: De-emphasis is available only in Single-Speed Mode.
Gain
dB
T1=50 µs
0dB
-10dB
T2 = 15 µs
F1
3.183 kHz
F2 Frequency
10.61 kHz
Figure 18. De-Emphasis Curve
8.6 Mute Control - Address 06h
7
6
5
4
3
2
1
0
Auto Mute
Mute ADC SP Mute ADC SP
ch B
ch A
mute polarity
Mute DAC SP Mute DAC SP
ch B
ch B
8.6.1 Auto-Mute (Bit 5)
Function:
When set, enables the Auto-Mute function. Section 5.2.6 “Auto-Mute” on page 26.
8.6.2 ADC Channel A & B Mute (Bits 4:3)
Function:
When this bit is set, the output of the ADC for the selected channel will be muted.
8.6.3 Mute Polarity (Bit 2)
Function:
The MUTEA and MUTEB pins (pins 24 and 21) are active low by default. When this bit is set, these pins
are active high.
8.6.4 DAC Channel A & B Mute (Bits 1:0)
Function:
When this bit is set, the output of the DAC for the selected channel will be muted.
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DS686A1