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IL34118DWT

Voice Switched Speakerphone Circuit

IK Semicon Co., Ltd 

TECHNICAL DATA

Voice Switched Speakerphone Circuit

IL34118

The IL34118 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 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 IL34118 may be operated from a power supply, or it can be powered from

the telephone line, requiring typically 5.0 mA. The IL34118 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 feature phone.

ORDERING INFORMATION

Operating

Device

Temperature

Range

IL34118N

IL34118DW

IL34118DWT

TA = -20 to 70 C

Package

DIP28

SOP28

SOP28

Packing

Tube

Tube

Tape & Reel

Futures

 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 Defined Function

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

Presence

IL34118N Plastic

IL34118DW/DWT SOIC

PIN ASSIGNMENT

2013, January, Ver. 02

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