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SL34118D Datenblatt(PDF) 1 Page - System Logic Semiconductor

Teilenummer SL34118D
Bauteilbeschribung  Voice Switched Speakerphone Circuit
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Hersteller  SLS [System Logic Semiconductor]
Direct Link  http://www.slsemicon.co.kr/e_index.htm
Logo SLS - System Logic Semiconductor

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SL34118
System Logic
Semiconductor
SLS
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


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