CS43L43

DS479PP3

21

5.8 LIMITER ATTACK RATE (ADDRESS 08H) (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. 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 Section 5.10.3).

5.9 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 Limiter Release Rate register. Rates are calculated using the function RATE = 512/{value}. Where {val-

ue} 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 Section 5.10.3).

7

654

32

10

ARATE7

ARATE6

ARATE5

ARATE4

ARATE3

ARATE2

ARATE1

ARATE0

0

001

00

00

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 11. Example Limiter Attack Rate Settings

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 12. Example Limiter Release Rate Settings