SL34118D System Logic Semiconductor, SL34118D Datasheet

SL34118D

Manufacturer Part Number

SL34118D

Description

Voice Switched Speakerphone Circuit

Manufacturer

System Logic Semiconductor

Datasheet

1.SL34118D.pdf (12 pages)

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Voice Switched Speakerphone Circuit

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.

SLS

The SL34118 Voice Switched Speakerphone Circuit incorporates

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

System Logic

Semiconductor

ORDERING INFORMATION

= -25 to 70 C for all packages

PIN ASSIGNMENT

SL34118N Plastic

SL34118D SOIC

SL34118

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