Cirrus-logic CS42L51 Manual do Utilizador descarregar pdf (Página 58)

58 DS679F1

CS42L51

6.9 DAC Control (Address 09h)

DAC Data Selection (DATA_SEL[1:0])

Default: 00

00 - PCM Serial Port to DAC

01 - Signal Processing Engine to DAC

10 - ADC Serial Port to DAC

11 - Reserved

Function:

Selects the digital signal source for the DAC.

Note: Certain functions are only available when the “Signal

Processing Engine to DAC” option is selected using these bits.

Freeze Controls (FREEZE)

Default: 0

Function:

This function will freeze the previous settings of, and allow modifications to be made to all control port reg-

isters without the changes taking effect until the FREEZE is disabled. To have multiple changes in the con-

trol port registers take effect simultaneously, enable the FREEZE bit, make all register changes, then

disable the FREEZE bit.

DAC De-Emphasis Control (DEEMPH)

Default: 0

0 - No De-Emphasis

1 - De-Emphasis Enabled

Function:

Note: The DATA_SEL[1:0] bits in reg09h must be set to ‘01’b to enable function control.

Enables the digital filter to apply the standard 15µs/50µs digital de-emphasis filter response for a sample

rate of 44.1 kHz.

Analog Output Auto MUTE (AMUTE)

Default: 0

0 - Auto Mute Disabled

1 - Auto Mute Enabled

Function:

Enables (or disables) Automatic Mute of the analog outputs after 8192 “0” samples on each digital input

channel.

76543210

DATA_SEL1 DATA_SEL0 FREEZE Reserved DEEMPH AMUTE DAC_SZC1 DAC_SZC0

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 87 88

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Cirrus-logic CS42L51 Manual do Utilizador Página 58