CS44L10

DS541PP1

17

4.5.3 TONE CONTROL MODE (TC)

Default = 00

00 - All settings are taken from user registers

01 - 12 dB of Bass Boost at 100 Hz and 6 dB of Treble Boost at 7 kHz (at LRCK = 48 kHz)

10 - 8 dB of Bass Boost at 100 Hz and 4 dB of Treble Boost at 7 kHz (at LRCK = 48 kHz)

11 - 4 dB of Bass Boost at 100 Hz and 2 dB of Treble Boost at 7 kHz (at LRCK = 48 kHz)

Function:

The Tone Control Mode bits determine how the Bass Boost and Treble Boost features are configured.

The user-defined settings from the Bass and Treble Boost Level and Corner Frequency registers are used

when these bits are set to ‘00’. Alternately, one of three pre-defined settings may be used (these settings

are a function of LRCK - refer to tables 5, 6, and 7).

Note: Treble boost is not available in Double Speed Mode.

4.5.4 TONE CONTROL ENABLE (TC_EN)

Default = 0

0 - Disabled

1 - Enabled

Function:

The Bass Boost and Treble Boost features are active when this function is enabled.

4.5.5 PEAK SIGNAL LIMITER ENABLE (LIM_EN)

Default = 0

0 - Disabled

1 - Enabled

Function:

The CS44L10 will limit the maximum signal amplitude to prevent clipping when this function is enabled.

Peak Signal Limiting is performed by first decreasing the Bass and Treble Boost Levels. If the signal is

still clipping, the digital attenuation is increased. The attack rate is determined by the Limiter Attack Rate

register.

Once the signal has dropped below the clipping level, the attenuation is decreased back to the user se-

lected level followed by the Bass Boost being increased back to the user selected level. The release rate

is determined by the Limiter Release Rate register.

Note: The A=B bit should be set to ‘1’ for optimal limiter performance.

TBCF

Fs

LRCK in Single Speed Mode (DBS=0)

48 kHz

24 kHz

12 kHz

8 kHz

00

2 kHz

1 kHz

0.5 kHz

0.33 kHz

01

4 kHz

2 kHz

1 kHz

0.67 kHz

10

7 kHz

3.5 kHz

1.75 kHz

1.17 kHz

11

Reserved

Reserved

Reserved

Reserved

Table 7. Treble Boost Corner Frequencies in Single Speed Mode