CS44210

DS539PP1

19

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, As, and the value

in the Limiter Attack Rate register. Rates are calculated using the function RATE = 32/{value}, where {val-

ue} 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 "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)").

76543

210

ARATE7

ARATE6

ARATE5

ARATE4

ARATE3

ARATE2

ARATE1

ARATE0

00010

000

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

76543

210

RRATE7

RRATE6

RRATE5

RRATE4

RRATE3

RRATE2

RRATE1

RRATE0

00100

000

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