MC34118 データシートの表示（PDF） - Contek Microelectronics

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MC34118

VOICE SWITCHED SPEAKER PHONE CIRCUIT

Contek Microelectronics 

MC34118

LINEAR INTEGRATED CIRCUIT

PIN CONFIGURATIONS

PIN NAME

DESCRIPTION

1 FO Filter Output. Output impedance is less than 50 ohms.

2 FI Filter Input. Input impedance is greater than 1 M ohms.

3 CD Chip Disable. A logic low (<0.8V) sets normal operation. A logic high (>2V) disable the IC to converse

power. Input impedance is nominally 90 K ohms.

4 Vcc A supply voltage of +2.8V to +6.5V is required at 5mA. As Vcc falls from 3.5V to 2.8V, 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 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 amplifier is set by external resistors.

7 HTI Input and summing node for the first hybrid amplifier. DC lever is about equal to VB.

8 TXO Output of the transmit attenuator. DC level is about VB.

9 TXI Input of the transmit attenuator. Maximum signal level is 350 mVrms. Input impedance is 10KW.

10 MCO Output of the microphone amplifier. The gain of the amplifier is set by external resistors.

11 MCI Input of the summing node of the microphone. DC lever is VB.

12 MUT Mute input. A logic low (<0.8V) sets normal operation. A logic high (>2V) mutes the microphone

amplifier without affecting the rest of the circuit. Input impedance is 90 K ohms.

13 VLC Volume control input. When VLC=VB, the receive attenuator is at maximum gain when in the receive

mode. When VLC=0.3dB, the receive gain is down 35dB. Does not effect the transmit modes.

14 CT The RC at this pin sets the response time for the circuit to switch modes.

15 VB N output voltage=Vcc/2. This voltage is a system AC ground and biases the volume control. A filter

capacitor is required.

16 CPT The RC at this pin sets the time constant for the transmit background side.

17 TLI2 Input to the transmit level detector on the microphone/ speaker side.

18 TLO2 Output to the transmit level detector on the microphone/ speaker side, and input to the transmit

background monitor.

19 RLO2 Output of the receive level detector on the microphone/ speaker side

20 RLI2 Input to the receive level detector on the microphone/ speaker side

21 RXI Input to the receive attenuator and dial tone detector. Maximum input level is 350mVrms. Input

impedance is 10KW.

22 RXO Output of the receive attenuator. DC level is VB.

23 TLI1 Input to the transmit level detector on the line side.

24 TLO1 Output to the transmit level detector on the line side, and input to the transmit background monitor.

25 RLO1 Output of the receive level detector on the line side.

26 RLI1 Input to the receive level detector on the line side.

27 CPR The 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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http://www.contek-ic.com E-mail:sales@contek-ic.com

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