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U4050B-AFL Datasheet(PDF) 3 Page - TEMIC Semiconductors |
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U4050B-AFL Datasheet(HTML) 3 Page - TEMIC Semiconductors |
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3 / 18 page  U4050B Rev. A2, 05-Mar-98 3 (18) Pin Description 1 2 3 4 5 6 7 8 10 9 27 22 21 20 18 19 17 12 11 28 25 26 23 24 CK MICO DTMF GS MIC1 MIC2 ST CLIM LEVSQ RECO1 GR RECO2 VL GND SAO VD RDC SWAMP PD VC CLISA GSA AGA IREF 16 15 14 13 14052 CSQ VM MUTE TIN Figure 3. Pinning S028 Pin Symbol Function 1 3 RECO2, RECO1 Symmetrical outputs of receiving amplifier 2 GR A resistor connected from this pin to VM (AC coupled) sets the receiving amplification at the circuit 4 ST Input of sidetone amplifier 5 CLIM Time constant of anticlipping in trans- mit patch 6 CK Input of receiving path 7 MICO Output of microphone preamplifier 8 DTMF Input for DTMF signals (ac coupled). In Mute condition a small portion of the signal at this pin is monitored to the receiver output. 9 GS A resistor from this pin to VM sets the amplification of microphone and DTMF signals. 10 MIC1 Inverting input of microphone ampli- fier Pin Symbol Function 11 MIC2 Non-inverting input of microphone amplifier 12 LEVSQ Input for setting the switching level of the squelch circuit 13 CSQ Time constant of the squelch function 14 VM Reference node for microphone, ear- phone and loudspeaker amplifier. Supply for electret microphone set to VD/2. 15 TIN Input of intermediate transmit stage 16 MUTE Active high input to switch the circuit into DTMF condition. 17 CLISA Time constant of anticlipping of speaker amplifier. 18 SWAMP A resistor connected from this pin to ground converts the excess line cur- rent into heat in order to prevent the IC from thermal destruction at high line currents 19 RDC A small resistor connected from this pin to VL sets the slope of the charac- teristic and also affects the line length equalization characteristics and the line current at which the loudspeaker amplifier is switched on. 20 VD Unregulated supply voltage for pe- ripheral circuits (dialers, microproces- sors, etc.). Output current capability and output voltage increase with line current. 21 SAO Output of loudspeaker amplifier. 22 GND Reference point for DC and AC out- put signals 23 VL Line voltage 24 VC The internal equivalent inductance of the circuit is proportional to the value of the capacitor at this pin. A resistor connected to ground may be used to reduce the line voltage. 25 PD Active high input for reducing the current consumption of the circuit. Simultaneously VL is shorted by an internal switch. 26 GSA Current input for setting the gain of the speaker amplifier 27 AGA Automatic gain adjustment with line current. A resistor connected from this pin to VL sets the starting point. Maximum gain change is 6 dB. 28 IREF Internal reference current generation |
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