STAC9752 datasheet(77/95 Pages) IDT

77 / 95 page

STAC9752/9753

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING

IDT™

STAC9752/9753

REV 3.3 1206

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING

8.4.10.

Analog Current Adjust (72h)

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

Default: 0000h

8.4.11.

EAPD Access Register (74h)

Default: 0800h

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 STAC9752/9753 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). A 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

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 Anti Pop 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

D15

D14

D13

D12

D11

D10

EAPD

RESERVED

EAPD_OEN

RESERVED

INTDIS

GPIOACC

GPIOSLT12

Bit(s) Reset Value

Name

Description

STAC9752 Datasheet(PDF) 77 Page - Integrated Device Technology

STAC9752 Datasheet(HTML) 77 Page - Integrated Device Technology

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