CS43L42 查看數據表（PDF） - Cirrus Logic

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CS43L42

Low Voltage, Stereo DAC with Headphone Amp

Cirrus Logic 

CS43L42

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

7

RRATE7

0

6

RRATE6

0

5

RRATE5

1

4

RRATE4

0

3

RRATE3

0

2

RRATE2

0

1

RRATE1

0

0

RRATE0

0

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)).

Binary Code

00000001

00010100

00101000

00111100

01011010

Decimal Value

1

20

40

60

90

LRCK’s per 1/8 dB

512

25

12

8

5

Table 6. Example Limiter Release Rate Settings

4.10 Volume and Mixing Control (address 0Ah)

7

6

5

4

3

2

TC1

TC0

TC_EN

LIM_EN

ATAPI3

ATAPI2

0

0

0

0

1

0

1

ATAPI1

0

0

ATAPI0

1

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.

22

DS481PP2

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