CS43L42

22

DS481PP2

4.9 Limiter Release Rate (address 09h) (RRATE)

Default = 20h - 16 LRCK’s per 1/8 dB

Function:

The limiter release rate is user selectable. The rate is a function of sampling frequency, Fs, and the value

in the Limiter Release Rate register. Rates are calculated using the function RATE = 512/{value}, where

{value} is the decimal value in the Limiter Release 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)).

4.10 Volume and Mixing Control (address 0Ah)

4.10.1 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

10 - 8 dB of Bass Boost at 100 Hz and 4 dB of Treble Boost at 7 kHz

11 - 4 dB of Bass Boost at 100 Hz and 2 dB of Treble Boost at 7 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.

4.10.2 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.

7

654

32

10

RRATE7

RRATE6

RRATE5

RRATE4

RRATE3

RRATE2

RRATE1

RRATE0

0

010

00

00

Binary Code

Decimal Value

LRCK’s per 1/8 dB

00000001

1

512

00010100

20

25

00101000

40

12

00111100

60

8

01011010

90

5

Table 6. Example Limiter Release Rate Settings

7

654

32

10

TC1

TC0

TC_EN

LIM_EN

ATAPI3

ATAPI2

ATAPI1

ATAPI0

0

000

10

01