PBM3911

The PBM3911 is a CMOS intergrated circuit,designed for voice switched speaker-phone systems. The circuit PBM3911 incorporates complementary digitally controlled attenuators for the necessary half duplex behavior,microphone and receive amplifiers PBM3911,transmit and receive level detectors and an advanced background noise reduction system. A 4-bit analogue-to-digital converter implements a voltage controlled volume-setting. The background noise reduction system uses a DC converted noise signal ofPBM3911 to increase the microphone threshold,ensuring proper operation of the voice switch even in a noisy environment. The same signal is used to attenuate the microphone channel,thereby suppressing the background noise.

PBM3911 has many unique features: the first one is input amplifiers in both channels. the second one is incorporates all necessary level detection circuitry. The third one is A/D-converter providing a linear volume control.The forth oneis 50 dB attenuation range in each channel,etc. There are also some maximum ratings about it.SUpply voltage(VDD) is -0.3 V min and 6.0 V max. Storage temperature(Tstg) is -55 to +125.Operating ambient temperature(Tamb) is -15 to +70.Voltage on any pin(Vin) is Vss-0.3 V min and VDD+0.3 V max. DC-current MO and LSO(IDC) is 10 mA max.

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