UTCMC34018 查看數據表（PDF） - Unisonic Technologies

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UTCMC34018

VOICE SWITCHED SPEAKER-PHONE CIRCUIT

Unisonic Technologies 

UTCMC34018 LINEAR INTEGRATED CIRCUIT

as by varying the external components.

APPLICATIONS INFORMATION

The UTC MC34018 speakerphone IC is designed to provide the function additionally required when a

speakerphone is added to a standard telephone. The IC provides the necessary relative level detection and

comparison of the speech signals provided by the talkers at the speakerphone(near end speaker) and at the distant

telephone(far end speaker).

The UTC MC34018 is designed for use with an electorate type microphone a 25 ohms speaker, and has an

output power capability of 100mW.All external components surrounding this device are passive, however, this IC

does require additional circuitry to interface the TIp and Ring telephone lines. Two suggested circuits are shown in

the data sheet.

Fig 16 depicts a configuration which does not include a handset, dialer, or ringer. The only controls are S1(to

make the connection to the line),S2(a "privacy" switch),and the volume control. It is meant to be used in parallel with

a normal telephone which has dialing and ringing functions.

Fig 17 depicts a means of providing logic level signal that indicate which mode of operation the UTC MC34018

is in. Comparator A indicates whether the circuit is in receive or transmit mode and comparator B indicates(when in

transmit/idle mode) whether the circuit is in the transmit or idle mode. The UTC LM393 dual comparator is chosen

because of its low current requirement (<1.0mA), low voltage requirement (as low as 2.0volts), and low cost.

TRANSMIT

OUTPUT

MIC

0.05 µF

VB

12kΩ

9

2kΩ

0.1 µF

MCI

3.3kΩ

0.068 µF

5 TLI

VB

6 TLO

4.7kΩ

0.068 µF

7 RTI

VB

0.068 µF

4.7kΩ

4.7 µF

47 µF

DC line input

1000 µF

Receive input

59kΩ

10 13

MCO XDI

12

CP2

MIC AMP

VB

500Ω

VB

33kΩ

56kΩ

11

CP1

transmit

detector comp

23

XDC

Vcc

18

CS

26kΩ

VCC

regulator

Vth

(36mV)

TRANSMIT

LOG AMP

Attenuator

control

peak

limiter

RECEIVE/TRANSMIT

COMP

Vcc

500Ω

VB

regulator

transmit

attenuator

receive

attenuator

Vcc

Speaker

amp

RECEIVE

AMP

1.0 µF

RLO

VB VLC ACF TXI RTX RR TXO RXI RRX RXO SKI

8

21 24 25 3 2 1 4 27 28 26 19

VB

47 µF

4.7 µF

30kΩ

18kΩ 4.3kΩ

2.2MΩ

Vcc

0.1 µF

0.1 µF

0.05 µF

0.01 µF

SKG

14

16

V+

Vcc

47 µF

5.4V 20

22

GND

AGC

17

VB

1.0 µF

SKO

15

47 µF

25Ω

Fig 1 Test circuit

UTC

UNISONIC TECHNOLOGIES CO., LTD. 10

QW-R108-006,A

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