Datenblatt-Suchmaschine für elektronische Bauteile |
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TS34118CS28C8 Datenblatt(PDF) 5 Page - Taiwan Semiconductor Company, Ltd |
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TS34118CS28C8 Datenblatt(HTML) 5 Page - Taiwan Semiconductor Company, Ltd |
5 / 21 page TS34118 Voice Switched Speakerphone Circuit 5/21 Version: A13 Pin Function Description Pin Name Description 1 FO Filter output. Output impedance is less than 50 ohms. 2 FI Filter input. Input impedance is greater than 1.0Mohm. 3 CD Chip Disable. A logic low(<0.8V) sets normal operation. A logic high (>2.0V) disables the IC to conserve power. Input impedance is norminally 90KΩ. 4 Vcc A supply voltage of +2.8 to +6.5 volts is required, at ≈5.0mA. As Vcc falls from 3.5 to 2.8volts, an AGC circuit reduces the receive attenuator gain by ≈25dB (when in the receive mode). 5 HTO+ Output of the second hybrid amplifier. The gain is internally set at –1.0 to provide a differential output, in conjunction with HTO-, to the hybrid transformer. 6 HTO- Output of the first hybrid amplifier. The gain of the amp is set by external resistors. 7 HTI Input and summing node for the first hybrid amplifier . DC level is≈VB. 8 TXO Output of the transmit attenuator. DC level is approximately VB. 9 TXI Input to the transmit attenuator. Max. Signal level is 350m Vrms . Input impedance is 10KΩ. 10 MCO Output of the microphone amplifier. The gain of the amplifier is set by external resistors. 11 MCI Input and summing node of the microphone amplifier. DC level is≈ VB. 12 MUT Mute input. A logic low(<0.8V) sets normal operation. A logic high (>2.0V) mutes the microphone amplifier without affecting the rest of the circuit. Input impedance is norminally 90KΩ. 13 VLC Volume control input. When VLC=VB , the receive attenuator is at maximum gain when in the receive mode. When VLC=0.3VB, the receive gain is down 35dB. Does not affect the transmit mode. 14 CT An RC at this pin sets the response time for the circuit to switch modes. 15 VB An output voltage≈Vcc/2. This voltage is a system ac ground, and biases the volume control. A filter cap is required 16 CPT An RC at this pin sets the time constant for the transmit background monitor. 17 TLI2 Input to the transmit level detector on the mike/speaker side. 18 TLO2 Output of the transmit level detector on the mike/speaker side, and input to the transmit background monitor. 19 RLO2 Output of the receive level detector on the mike/speaker side. 20 RLI2 Input to the receive level detector on the mike/speaker side. 21 RXI Input to the receive attenuator and dial tone detector. Max input level is 350mV RMS. Input impedance is ≈10KΩ. 22 RXO Output of the receive attenuator. DC level is approximately VB. 23 TLI1 Input to the transmit level detector on the line side. 24 TLO1 Output of the transmit level detector on the line side. 25 RLO1 Output of the receive level detector on the line side, and input to the receive background monitor. 26 RLI1 Input to the receive level detector on the line side. 27 CPR An RC at this pin sets the time constant for the receive background monitor. 28 GND Ground pin for the entire IC. |
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Ähnliche Beschreibung - TS34118CS28C8 |
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