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LM4935RLEVAL Datasheet(PDF) 31 Page - Texas Instruments |
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LM4935RLEVAL Datasheet(HTML) 31 Page - Texas Instruments |
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31 / 91 page  LM4935, LM4935RLEVAL www.ti.com SNAS296D – OCTOBER 2005 – REVISED MARCH 2006 Table 4-16. MIC_1 (0x0Bh) Bits Field Description 3:0 PREAMP_GAIN Programs the gain applied to the microphone preamplifier if the AGC is not in use. PREAMP_GAIN Gain 00002 6 dB 00012 8 dB 00102 10 dB 00112 12 dB 01002 to 11002 14 dB to 30 dB 11012 32 dB 11102 34 dB 11112 36 dB 4 MIC_MUTE If set the microphone preamplifier is muted. 5 INT_SE_DIFF If set the internal microphone is assumed to be single ended and the negative connection is connected to the ADC common mode point internally. This allows a single-ended internal microphone to be used. 6 INT_EXT If set the single ended external microphone is used and the negative microphone input is grounded internally, otherwise internal microphone operation is assumed. (Note 19) 4.2.17 MIC_2 CONFIGURATION REGISTER This register is used to control the microphone configuration. Table 4-17. MIC_2 (0x0Ch) Bits Field Description 0 OCL_ Selects the voltage used as virtual ground (HP_VMID pin) in OCL mode. This will depend on the available VCM_ supply and the power output requirements of the headphone amplifiers. VOLTAGE OCL_VCM_VOLTAGE Voltage 0 1.2V 1 1.5V 2:1 MIC_ Selects the voltage as a reference to the internal and external microphones. Only one bias pin is driven at BIAS_ once depending on the INT_EXT bit setting found in the MIC_1 (0x0Bh) register. MIC_BIAS_VOLTAGE VOLTAGE should be set to '11' only if A_VDD > 3.4V. In OCL mode, MIC_BIAS_VOLTAGE = '00' (EXT_BIAS = 2.0V) should not be used to generate the EXT_BIAS supply for a cellular headset external microphone. Please refer to Table 4-18 for more detail. MIC_BIAS_VOLTAGE EXT_BIAS INT_BIAS 002 2.0V 2.0V 012 2.5V 2.5V 102 2.8V 2.8V 112 3.3V 3.3V 3 BUTTON_TYPE If set the LM4935 assumes that the button (if used) in the headset is in series (series push button) with the microphone, opening the circuit when pressed. The default is for the button to be in parallel (parallel push button), shorting out the microphone when pressed. 5:4 BUTTON_ Sets the time used for debouncing the pushing of the button on a headset with a parallel push button. DEBOUNCE_ BUTTON_DEBOUNCE_TIME Time (ms) TIME 002 0 012 8 102 16 112 32 Copyright © 2005–2006, Texas Instruments Incorporated Application Information 31 Submit Documentation Feedback Product Folder Links: LM4935 LM4935RLEVAL |
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