Cirrus Logic CS4349 - Manual (Page 30)

30 DS782F2
CS4349
8.2.2 De-Emphasis Control (DEM[1:0]) Bits 3-2
Default = 0
00 - No De-emphasis
01 - 44.1 kHz De-emphasis
10 - 48 kHz De-emphasis
11 - 32 kHz De-emphasis
Function:
Selects the appropriate digital filter to maintain the standard
15
s/50 s digital de-emphasis filter response at 32, 44.1
or 48 kHz sample rates. (See Figure 20 )
Note: De-emphasis is only available in Single-Speed
Mode
8.2.3 Functional Mode (FM[1:0]) Bits 1-0
Default = 00
00 - Auto speed mode detect
01 - Single-Speed Mode (30 to 54 kHz sample rates)
10 - Double-Speed Mode (50 to 108 kHz sample rates)
11 - Quad-Speed Mode (100 to 216 kHz sample rates)
Function:
Selects the required range of input sample rates or auto speed mode.
8.3 Volume Mixing and Inversion Control - Register 03h
8.3.1 Channel A Volume = Channel B Volume (VOLB=A) Bit 7
Function:
When set to 0 (default), the AOUTA and AOUTB volume levels are independently controlled by the A and
the B Channel Volume Control Bytes.
When set to 1, the volume on both AOUTA and AOUTB are determined by the A Channel Attenuation and
Volume Control Bytes, and the B Channel Bytes are ignored.
8.3.2 Invert Signal Polarity (INVERT_A) Bit 6
Function:
When set to 1, this bit inverts the signal polarity of channel A.
When set to 0 (default), this function is disabled.
This function is only available for Left Justified, Right Justified 16, and Right Justified 24 data formats.
7 6 5 4 3 2 1 0
VOLB=A INVERT_A INVERT_B Reserved ATAPI3 ATAPI2 ATAPI1 ATAPI0
0 0 0 0 1 0 0 1
Gain
dB
-10dB
0dB
Frequency
T2 = 15 µs
T1=50 µs
F1 F2
3.183 kHz 10.61 kHz
Figure 20. De-Emphasis Curve