UTCMC34018 查看數據表（PDF） - Unisonic Technologies

零件编号

产品描述 (功能)

比赛名单

UTCMC34018

VOICE SWITCHED SPEAKER-PHONE CIRCUIT

Unisonic Technologies 

UTCMC34018 LINEAR INTEGRATED CIRCUIT

BLOCK DIAGRAM

MIC

MIC AMP

TRANSMIT

CHANNEL

TRANSMIT

ATTENUATOR

TRANSMIT LEVEL

DETECTOR

SIGNAL/NOISE

DETECTOR

ATTENUATOR

CONTROL

TRANSMIT/

RECEIVE

COMPARATOR

PEAK LIMITER

RECEIVE

CHANNEL

SPEAKER

AMP

RECEIVE

ATTENUATOR

RECEIVE LEVEL

DETECTOR

VCC

REGULATOR

RECEIVE VOLUME CONTROL

ENABLE INPUT

TRANSMIT

OUTPUT

SIDE

TONE

SIDE TONE

NETWORK

RECEIVE INPUT

DC INPUT

TELEPHONE

LINE

PIN CONFIGURATIONS

PIN NAME

DESCRIPTION

1 RR A resistor to ground provides a reference current for the transmit and receive attenuators

2 RTX A resistor to ground determines the nominal gain of the transmit attenuator ,the transmit channel gain

is inversely proportional to RTX resistance.

3 TXI Input to the transmit attenuator. Input resistance is nominally 5.0k ohms.

4 TXO Output of the transmit attenuator. The TXO output signal drivers the input of transmit level detcetor,

as well as the external circuit which drivers the telephone line.

5 TLI Input of the transmit level detector. An external resistor ac coupled to The TLI pin sets the detection

level. Decreasing this resistor increases the sensitivity to transmit channel signals.

6 TLO Output of the transmit level detector. The external resistor and capacitor set the time the comparator

will hold the system in the transmit mode after speech ceases.

7 RLI Input of the receive level detector. An external resistor ac coupled to The RLI pin sets the detection

level. Decreasing this resistor increases the sensitivity to receive channel signals.

8 RLO Output of the receive level detector. The external resistor and capacitor set the time the comparator

will hold the system in the receive mode after speech ceases.

9 MCI Microphone amplifier input. Input impedance is nominally 10k ohms and the dc bias voltage is

approximately equal to VB

10 MCO Microphone amplifier output. The MIC amp gain is internally set at 34dB(50V/V).

11 CP1 A parallel resistor and capacitor connected between this pin and VCC holds a voltage corresponding

to the background noise level. The transmit detector compares the CP1 voltage with the speech

signal from CP2.

12 CP2 A capacitor at this pin peak detects the speech signals for comparison with the background noise

level held at CP1.

13 XDI Input to the transmit detector system. The microphone amplifier output is ac coupled to the XDI pin

through an external resistor.

UTC

UNISONIC TECHNOLOGIES CO., LTD. 2

QW-R108-006,A

Share Link: