18

DS640PP4

CS44L11

4.6

Limiter Attack Rate (address 07h) (ARATE)

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.

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)").

4.7

Limiter Release Rate (address 08h) (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)").

76

543

21

0

ARATE7

ARATE6

ARATE5

ARATE4

ARATE3

ARATE2

ARATE1

ARATE0

00

010

00

0

Binary Code

Decimal Value

LRCK’s per 1/8 dB

00000001

1

32

00010100

20

1.6

00101000

40

0.8

00111100

60

0.53

01011010

90

0.356

Table 8. Example Limiter Attack Rate Settings

76

543

21

0

RRATE7

RRATE6

RRATE5

RRATE4

RRATE3

RRATE2

RRATE1

RRATE0

00

100

00

0

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 9. Example Limiter Release Rate Settings