CS53L32A

24

DS513F1

4.12

LEFT CHANNEL VOLUME = RIGHT CHANNEL VOLUME

Analog I/O Control (address 03h)

Access:

R/W in Two Wire Mode and write only in SPI.

Default:

0 - Disabled

Function:

When this function is disabled, the left channel volume is determined by the left channel volume con-

trol register and right channel volume is determined by the right channel volume control register.

When enabled, the left and right channel volumes are determined by the left channel volume control

register and the right channel volume control register is ignored.

4.13

HIGH-PASS FILTER FREEZE

Analog I/O Control Register (address 03h)

Access:

R/W in Two Wire Mode and write only in SPI.

Default:

0 - Enabled

Function:

The high-pass filter works by continuously subtracting a measure of the dc offset from the output of

the decimation filter. If the HPFREEZE bit is taken low during normal operation, the current value of

the dc offset is frozen and this dc offset will continue to be subtracted from the conversion result. This

feature makes it possible to perform a system calibration by:

1) removing the signal source at the input to the subsystem containing the CS53L32A,

2) running the CS53L32A with the HPFREEZE bit high until the filter settles, approximately

one second,

3) taking the HPFREEZE bit low, thus disabling the high-pass filter and freezing the stored dc offset.

A system calibration performed in this way will eliminate offsets anywhere in the signal path between

the calibration point and the CS53L32A.

76543

210

MUTEL

MUTER

SOFT

ZC

RESERVED

INDVC

L=R

HPFREEZE

76543

210

MUTEL

MUTER

SOFT

ZC

RESERVED

INDVC

L=R

HPFREEZE

HPFREEZE

MODE

0

Enabled

1Frozen

Table 12. High-Pass Filter Enable