WM9710SEFT/RV 查看數據表（PDF） - Wolfson Microelectronics plc

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WM9710SEFT/RV

AC’97 Audio CODEC and Mixer with Integrated Headphone Driver

Wolfson Microelectronics plc 

WM9710

Production Data

MUTE

PV3...PV0

FUNCTION

0

0000

0dB attenuation

0

1111

45dB attenuation

1

xxxx

∞dB attenuation

Table 6 PC-beep Register Function

ANALOGUE MIXER INPUT GAIN REGISTERS (INDEX 0CH - 18H AND 72H)

This controls the gain/attenuation for each of the analogue inputs and mixer PGA. Each step

corresponds to approximately 1.5dB. The MSB of the register is the mute bit. When this bit is set

to 1 the level for that channel is set at -∞dB. Note that the gain for the VID and AUX input

channels is fixed at 0dB. Writes to the gain control bits for these channels are ignored, and the

value of readback for these registers is always the default, with the exception of the mute bit 15

which may be written to and read from.

The default value for the mono registers is 8008h, which corresponds to 0dB gain with mute on.

The default value for stereo registers is 8808h, which corresponds to 0dB gain with mute on.

MUTE

0

0

0

1

GX4...GX0

00000

01000

11111

xxxxx

FUNCTION

+12dB gain

0dB gain

-34.5dB gain

-∞dB gain

Table 7 Mixer Gain Control Register Function

REGISTER 0EH (MIC VOLUME REGISTER)

This has an extra bit that is for a 20dB boost. When bit 6 is set to 1 the 20dB boost is on. The

default value is 8008h, which corresponds to 0dB gain with mute on.

RECORD SELECT CONTROL REGISTER (INDEX 1AH)

Used to select the record source independently for right and left (see Table 8). The default value

is 0000h, which corresponds to Mic in. Setting Bit ADCNDAC in Register 5Ch selects a stereo mix

WITHOUT DAC when (5 x 2 – 5 x 0) is 5.

SR2 TO SR0 RIGHT RECORD SOURCE

0

Mic

1

CD in (R)

3

Line in (R)

4

Stereo mix (R)

5

Mono mix

6

Phone

Table 8 Record Select Register Function

SL2 TO SL0

0

1

4

5

6

7

LEFT RECORD SOURCE

Mic

CD in (L)

Line in (L)

Stereo mix (L)

Mono mix

Phone

RECORD GAIN REGISTERS (INDEX 1CH)

1Ch sets the stereo input record gain with each step corresponding to 1.5dB. The MSB of the

register is the mute bit. When this bit is set to 1, the level for both channels is set at -∞dB.

The default value is 8000h, which corresponds to 0dB gain with mute on.

MUTE

GX3...GX0

FUNCTION

0

1111

+22.5dB gain

0

0000

0dB gain

1

xxxxx

-∞dB gain

Table 9 Record Gain Register Function

GENERAL PURPOSE REGISTER (INDEX 20H)

This register is used to control several miscellaneous functions of the WM9710.

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PD Rev 4.0 December 2003

21

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