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U4091BM-AFNG3 Datasheet(PDF) 3 Page - TEMIC Semiconductors |
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U4091BM-AFNG3 Datasheet(HTML) 3 Page - TEMIC Semiconductors |
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3 / 29 page  U4091BM Target Specification 3 (29) Rev. A1, 02-Jun-98 Pin Description Pin Symbol Function 1 RECIN Receive amplifier input 2 TXACL Time-constant adjustment for transmit anti-clipping 3 MIC3 Microphone input for hands-free operation 4 MIC2 Input of symmetrical microphone amplifier with high common-mode rejection ratio 5 MIC1 Input of symmetrical microphone amplifier with high common-mode rejection ratio 6 RECO2 Output of the receive amplifier 7 RECO1 Output of the receive amplifier, also used for sidetone network 8 IND 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 adjust the DC mask. 9 VL Positive supply-voltage input to the device in speech mode 10 SENSE Input for sensing the available line current 11 GND Ground, reference point for DC- and AC signals 12 VB Unstabilized supply voltage for speech network 13 SAO2 Negative output of speaker amplifier (push-pull only) 14 SAO1 Positive output of speaker amplifier (single ended and push-pull operation) 15 VMPS Unregulated supply voltage for the microcontroller (via series regulator to VMP) 16 VMP Regulated output voltage for supplying the microcontroller (typ. 3.3 V/ 6 mA in speech mode) 17 VMIC Reference node for microphone amplifier, supply for electret microphones 18 TSACL Time constant for speaker amplifier anti-clipping Pin Symbol Function 19 VRING Input for ringer supply 20 IMPA Input for adjusting the ringer input impedance 21 COSC 70-kHz oscillator for ringing power converter 22 SWOUT Output for driving the external switch resistor 23 INT Interrupt line for serial bus 24 SCL Clock input for serial bus 25 SDA Data line for serial bus 26 OSCIN Input for 3.58-MHz oscillator 27 OSCOUT Clock output for the microcontroller 28 RESET Reset output for the microcontroller 29 ES Input for external supply indication 30 ADIN Input of A/D converter 31 BNMR Output of background-noise monitor receive 32 BNMT Output of background-noise monitor transmit 33 CT Time constant for mode switching of voice switch 34 TLDR Time constant of receive-level detector 35 INLDR Input of receive-level detector 36 INLDT Input of transmit-level detector 37 TLDT Time constant of transmit-level detector 38 IMPSW Switch for aditional line impedance 39 MICO Microphone preamplifier output 40 AMPB Input for playback signal of answering machine 41 AMREC Output for recording signal of answering machine 42 STO Output for connecting the sidetone network 43 STC Input for sidetone network 44 STRC Input for sidetone network Remark: The protection device at Pin RECIN is disconnected. |
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