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SL34118D

Voice Switched Speakerphone Circuit

System Logic Semiconductor 

SL34118

Voice Switched Speakerphone Circuit

The SL34118 Voice Switched Speakerphone Circuit incorporates

the necessary amplifiers, attenuators, level detectors, and control

algorithm to form the heart of a high quality hands-free speakerphone

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 channels. A Dial Tone Detector prevents the dial tone

from being attenuated by the Receive background noise monitor

circuit. Also included are two line driver amplifiers which can be used

to form a hybrid network in conjunction with an external coupling

transformer. A high pass filter can be used to filter out 60 Hz noise in

the reseive 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 SL34118 may be operated from a power supply, or it can be

powered from the telephone line, requiring typically 5.0 mA. The

SL34118 can be interfaced directly to Tip and Ring (through a coupling

transformer) for stand-alone operation, or it can be used in

conjunction with a handset speech network and or other features of a

featurephone.

• Improved Attenuator Gain Range: 52 dB Between Transmit and

Receive

• Low Voltage Operation for Line-Powered Applications (3.0-6.5 V)

• 4 Point Signal Sensing for Improved Sensitivity

• Background Noise Monitors for Both Transmit and Receive Paths

• Microphone Amplifier Gain Set by External Resistors - Mute

Function Included

• Chip Disable for Active Standby Operation

• On Board Filter Pinned-Out for User Deined Function

• Dial Tone Detector to Inhibit Receive Idle Mode During Dial Tone

Presence

ORDERING INFORMATION

SL34118N Plastic

SL34118D SOIC

TA = -25° to 70° C for all packages

PIN ASSIGNMENT

SLS

System Logic

Semiconductor

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