STAC9752A datasheet(81/106 Pages) IDT

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STAC9752A/9753A

AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

PC AUDIO

IDT™

STAC9752A/9753A

V 1.5 1206

AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

7.4.10.

Analog Current Adjust (72h)

To unlock Register 72h, write 0xABBA to Register 70h.

Default: 0000h

5:4

ADCSLT1:0

Select slots for ADC data on ACLINK

00 = left slot 3, right slot 4

01 = left slot 7, right slot 8

10 = left slot 6, right slot 9

11 = left slot 10, right slot 11

Reserved

MIC GAIN VAL

Adds +10dB gain to the selected MIC input. Use in conjunction with

BOOSTEN (Reg. 0Eh;D6)

BOOSTEN MICGAINVAL

0 dB

= 10 dB

= 20 dB

= 30 dB

SPLYOVR_EN

Supply Override bit allows override of the supply detect.

0 = no override on supply detect

1 = override supply detect with bit 0

SPLYOVR_VA

Supply Override Value provides the analog voltage operation values.

0 = force 3.3 V operation

1 = force 5 V operation

D15

D14

D13

D12

D11

D10

Reserved

INT APOP

Reserved

Bit(s) Reset Value

Name

Description

15:8

Reserved

INT_APOP

0 = Anti Pop Enabled

1 = Anti Pop Disabled

The STAC9752A/9753A includes an internal power supply anti-pop circuit that

prevents audible clicks and pops from being heard when the CODEC is powered

on and off. This function is accomplished by delaying the charge/discharge of the

VREF capacitor (Pin 27). CVREF value of 1 µF will cause a turn-on delay of

roughly 3 seconds, which will allow the power supplies to stabilize before the

CODEC outputs are enabled. The delay will be extended to 30 seconds if a value

of CVREF value of 10 µF is used. The CODEC outputs are also kept stable for the

same amount of time at power-off to allow the system to be gracefully turned off.

The INT_APOP bit allows this delay circuit to be bypassed for rapid production

testing. Any external component anti-pop circuit is unaffected by the internal

circuit.

6:0

Reserved

Bit(s) Reset Value

Name

Description

STAC9752A Datasheet(PDF) 81 Page - Integrated Device Technology

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