STAC9752 datasheet(49/95 Pages) IDT

49 / 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

8.1.3.

Headphone Volume Registers (04h)

Default: 8000h

Bit(s)

Reset Value

Name

Description

Mute

0 = No mute

1 = Mutes both left & right channels

RESERVED

Bit not used, should read back 0

ML5

0 = Lineout attenuation is a function of bits12-8

1 = Forces register bits 12-8 to be 11111. Always reads back 0.

12:8

ML<4:0>

Left Lineout Volume Control

00000 = 0dB attenuation

00001 = 1.5dB attenuation

.....

11111 = 46.5dB attenuation

7:6

RESERVED

Bits not used, should read back 0

MR5

0 = Lineout attenuation is a function of bits 4-0

1 = Forces register bits 4-0 to be 11111

Always reads back 0

4:0

MR<4:0>

Right Channel Lineout Volume Control

00000 = 0dB attenuation

00001 = 1.5dB attenuation

.....

11111 = 46.5dB attenuation

D15

D14

D13

D12

D11

D10

Mute

RSRVD

HPL5

HPL4

HPL3

HPL2

HPL1

HPL0

RESERVED

HPR5

HPR4

HPR3

HPR2

HPR1

HPR0

Bit(s)

Reset Value

Name

Description

Mute

0 = No mute

1 = Mutes both left & right channels

RESERVED

Bit not used, should read back 0

ML5

0 = Headphone attenuation is a function of bits12-8

1 = Forces register bits 12-8 to be 11111. Always reads back 0

12:8

ML<4:0>

Left Headphone Volume Control

00000 = 0dB attenuation

00001 = 1.5dB attenuation

.....

11111 = 46.5dB attenuation

7:6

RESERVED

Bits not used, should read back 0

MR5

0 = Headphone attenuation is a function of bits 4-0

1 = Forces register bits 4-0 to be 11111. Always reads back 0

4:0

MR<4:0>

Right Channel Headphone Volume Control

00000 = 0dB attenuation

00001 = 1.5dB attenuation

.....

11111 = 46.5dB attenuation

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