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MC34118 VOICE SWITCHED SPEAKERPHONE CIRCUIT

technical

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INJECTION - General

MC34118

VOICE SWITCHED SPEAKERPHONE CIRCUIT

The MC34118 Voice Switched Speakerphone Circuit incorporates the




nessesary amplifier, attenuators, level detectors, and control algorithm to

form the heart for a high quality hands-free speacerphone system . Included

are a microphone amplifier with adjustable gain and MUTE control. Transmit

and Receive attenuators which operate in a complementary manner, level

detectors at both input and output of both attenuators, and background

noise monitors for both the transmit and receive channals. A Dial Tone

Detector prevents the dial tone fom being attenuated by the Receive

baskgrounds noise monitor circuit. Also included are two line drive

ampifiers which can be used to form a hybrid network in conjunction with an

external coupling transforsmer. A high-pass filter can be used to filter

out 60Hz noise in the receive channel, or for other filtering functions. A

Chip Disable pin permits powering down the entire circuit to conserve power

on long loops where loop current is at a minimum.

The MC34118 may be operated from a power supply, or it can be powered

from the telephone line, requiring typically 5mA. The MC34118 can be

interfaced directly to Tip and Ring (thought a coupling transformer) for

stand-alone operation, or it can be used in cojunction with a handset

speech network and/or other features of a featurephone.

FEATURES

- Improved Attenuator Gain Range: 52dB Between Transmit and Receive

- Low Voltage Operation for Line-Powered Applications (36,5V)

- 4-Point Signal Sencing for Improved Sencitivity

- Background Noise Monitors for Both Transmit and Receive Parts

- Microphone Amplifier Gain Set by External Resistors - Mute Function

Included



- Chip Disable for Active/Standby Operation

- On Board Filter Pinned-Out for User Defined Function

- Dial Tone Detector to Inhibit Receive Idle Mode during Dial Tone

Presence

- Standart 28-Pin Plastic DIP Package and SOIC Package Avaible

- Compatible with MC34119 Speaker Amplifier

ABSOLUTE MAXIMUM RATING

Supply Voltage (Pin4) -1,+7V

Voltage at CD (Pin3), MUT (Pin12) -1,Vcc+1V

Volage at VLC (Pin13) -1,Vcc+0,5V

Voltage at TXI (Pin9), RXI (Pin21), FI (Pin2) -0,5;Vcc+0,5V

RECOMMENDED OPERATING LIMITS Min Typ Max

Supply Limits (Pin4) 3,5Vdc - 6,5Vdc

CD Input (Pin3), MUT (Pin12) 0 - Vcc

Ivb Current (Pin15) - - 500mkA

VLC (Pin13) 0,3xVb - Vb,Vdc

Attenuator Input Signal Voltage (Pin9,21) 0 - 350mVrms

Microphone Amplifier, Hibrid Amplifier Gain 0 - 40dB

Load Current @ RXO, TXO (Pin8,22) 0 - -+2mA

@ MCO(Pin10) 0 - -+1mA

@ HTO-, HTO+ (Pin6,5) 0 - -+5mA

Ambient Temperature Range -20C - +60C



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