CS43L42 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CS43L42 Datasheet PDF : 40 Pages
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CS43L42
4.7.4 DE-EMPHASIS CONTROL (DEM)
Default = 00
00 - Disabled
01 - 44.1 kHz
10 - 48 kHz
11 - 32 kHz
Function:
Selects the appropriate digital filter to maintain the standard 15 µs/50 µs digital de-emphasis filter re-
sponse at 32, 44.1 or 48 kHz sample rates. (see Figure 30)
Note: De-emphasis is not available in High-Rate Mode.
4.7.5 DIGITAL VOLUME CONTROL BYPASS (VCBYP)
Default = 0
0 - Disabled
1 - Enabled
Function:
The digital volume control section is bypassed when this function is enabled. This disables the digital vol-
ume control, muting, bass boost, treble boost, limiting and ATAPI functions. The analog headphone at-
tenuation control will remain functional.
4.8 Limiter Attack Rate (address 08h) (ARATE)
7
ARATE7
0
6
ARATE6
0
5
ARATE5
0
4
ARATE4
1
3
ARATE3
0
2
ARATE2
0
1
ARATE1
0
0
ARATE0
0
Default = 10h - 2 LRCK’s per 1/8 dB
Function:
The limiter attack rate is user selectable. The rate is a function of sampling frequency, Fs, and the value
in the Limiter Attack Rate register. Rates are calculated using the function RATE = 32/{value}, where
{value} is the decimal value in the Limiter Attack Rate register and RATE is in LRCK’s per 1/8 dB of
change.
Note: A value of zero in this register is not recommended, as it will induce erratic behavior of the limiter.
Use the LIM_EN bit to disable the limiter function (see Peak Signal Limiter Enable (LIM_EN)).
Binary Code
00000001
00010100
00101000
00111100
01011010
Decimal Value
1
20
40
60
90
LRCK’s per 1/8 dB
32
1.6
0.8
0.53
0.356
Table 5. Example Limiter Attack Rate Settings
DS481PP2
21
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