LM4935RLEVAL datasheet(34/91 Pages) TI1

34 / 91 page

LM4935, LM4935RLEVAL

SNAS296D – OCTOBER 2005 – REVISED MARCH 2006

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4.2.22 DAC CONFIGURATION REGISTER

This register is used to control the DAC levels to the mixer.

Table 4-23. DAC (0x11h)

Bits

Field

Description

4:0

DAC_LEVEL

Programs the gain/attenuation applied to the DAC input to the mixer. (Note 23)

DAC_LEVEL

Level (With Boost)

Level (Without Boost)

000002

−34.5 dB

−46.5 dB

000012

−33 dB

−45 dB

000102

−31.5 dB

−43.5 dB

000112

−30 dB

−42 dB

00100 to 111002

−28.5 dB to +7.5 dB

−40.5 dB to −4.5 dB

111012

+9 dB

−3 dB

111102

+10.5 dB

−1.5 dB

111112

+12 dB

0 dB

USE_AUX_

If set the gain of the DAC inputs is controlled by the AUX_LEFT and AUX_RIGHT registers, allowing a stereo

LEVELS

balance to be applied.

BOOST

If set the gain of the DAC inputs to the mixer is increased by 12 dB (see above).

DAC_MUTE

If set the stereo DAC input is muted on the next zero crossing.

4.2.23 CP_OUTPUT CONFIGURATION REGISTER

This register is used to control the differential cell phone output. (Note 24)

Table 4-24. CP_OUTPUT (0x12h)

Bits

Field

Description

MIC_SELECT

If set the microphone channel of the mixer is added to the cellphone output signal.

RIGHT_SELECT

If set the right channel of the mixer is added to the cellphone output signal.

LEFT_SELECT

If set the left channel of the mixer is added to the cellphone output signal.

CPO_MUTE

If set the CPOUT output is muted.

MIC_NOISE_GAT

If this is set and NOISE_GATE_ON (register 0x08h) is enabled, the MIC to CPO path will be gated if the

signal is determined to be noise by the AGC (that is, if the signal is below the set noise threshold).

4.2.24 AUX_OUTPUT CONFIGURATION REGISTER

This register is used to control the differential auxiliary output. (Note 25)

Table 4-25. AUX_OUTPUT (0x13h)

Bits

Field

Description

CPI_SELECT

If set the cell phone input channel of the mixer is added to the aux output signal.

RIGHT_SELECT

If set the right channel of the mixer is added to the aux output signal.

LEFT_SELECT

If set the left channel of the mixer is added to the aux output signal.

AUX_MUTE

If set the aux output is muted.

Application Information

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