LM4935RLEVAL datasheet(32/91 Pages) TI1

32 / 91 page

LM4935, LM4935RLEVAL

SNAS296D – OCTOBER 2005 – REVISED MARCH 2006

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In OCL mode there is a trade-off between the external microphone supply voltage (EXT_MIC_BIAS -

OCL_VCM_ VOLTAGE) and the maximum output power possible from the headphones. A lower

OCL_VCM_VOLTAGE gives a higher microphone supply voltage but a lower maximum output power from

the headphone amplifiers due to the lower OCL_VCM_VOLTAGE - A_VSS.

Table 4-18. External MIC Supply Voltages in OCL Mode

Available

Recommended

Supply to Microphone

A_VDD

EXT_MIC_BIAS

OCL_VCM_VOLT = 1.5V

OCL_VCM_VOLT = 1.2V

> 3.4V

3.3V

1.8V

2.1V

2.9V to 3.4V

2.8V

1.3V

1.6V

2.8V to 2.9V

2.5V

1.0V

1.3V

2.7V to 2.8V

2.5V

1.3V

4.2.18 SIDETONE ATTENUATION REGISTER

This register is used to control the analog sidetone attenuation. (Note 20)

Table 4-19. SIDETONE (0x0Dh)

Bits

Field

Description

3:0

SIDETONE_

Programs the attenuation applied to the microphone preamp output to produce a sidetone signal.

ATTEN

SIDETONE_ATTEN

Attenuation

00002

-Inf

00012

−30 dB

00102

−27 dB

00112

−24 dB

01002

−21 dB

01012 to 10102

−18 dB to −3 dB

10112 to 11112

0 dB

4.2.19 CP_INPUT CONFIGURATION REGISTER

This register is used to control the differential cell phone input.

Table 4-20. CP_INPUT (0x0Eh)

Bits

Field

Description

4:0

CPI_LEVEL

Programs the gain/attenuation applied to the cell phone input.

CPI_LEVEL

Level

000002

−34.5 dB

000012

−33 dB

000102

−31.5 dB

000112

−30 dB

00100 to 111002

−28.5 dB to +7.5 dB

111012

+9 dB

111102

+10.5 dB

111112

+12 dB

CPI_MUTE

If set the CPI input is muted at source.

Application Information

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