CS44800 datasheet(61/80 Pages) CIRRUS

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DS632F1

CS44800

7.15

Peak Limiter Control Register (address 15h)

7.15.1

Peak Signal Limit All Channels (LIMIT_ALL)

Default = 0

0 - individual channel

1 - all channels

Function:

When set to 0, the peak signal limiter will limit the maximum signal amplitude to prevent clipping on the

specific channel indicating clipping. The other channels will not be affected.

When set to 1, the peak signal limiter will limit the maximum signal amplitude to prevent clipping on ALL

channels in response to ANY single channel indicating clipping.

7.15.2

Peak Signal Limiter Enable (LIMIT_EN)

Default = 0

0 - Disabled

1 - Enabled

Function:

The CS44800 will limit the maximum signal amplitude to prevent clipping when this function is enabled.

Peak Signal Limiting is performed by digital attenuation. The attack rate is determined by the Limiter At-

tack Rate register.

7.16

Limiter Attack Rate (address 16h)

7.16.1

Attack Rate (ARATE[7:0])

Default = 00010000

Function:

The limiter attack rate is user selectable. The effective rate is a function of the SRC output sampling fre-

quency and the value in the Limiter Attack Rate register. Rates are calculated using the function

RATE = (32/{value})/SRC Fs, where {value} is the decimal value in the Limiter Attack Rate register and

SRC Fs is the output sample rate of the SRC which is determined by the PWM master clock frequency.

SRC Fs equals 384 kHz for 24.576 MHz based clocks and 421.875 kHz for 27.000 MHz based clocks.

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 Limiter Control Register (address 15h)).

765

RESERVED

LIMIT_ALL

LIMIT_EN

765

ARATE7

ARATE6

ARATE5

ARATE4

ARATE3

ARATE2

ARATE1

ARATE0

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