IL34118 Datasheet, PDF (1/14 Pages) Integral Corp. – Voice Switched Speakerphone Circuit

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