MC34118G-S28-R Voice Switched Speaker-Phone ICFeatures | Pricing | Description | Datasheet
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- Improved attenuator gain range: 52dB between Transmit and Receive
- Low voltage operation for line-powered applications(3~6.5V)
- 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
- Equivalent to Atmel U4082B
The UTC MC34118 voice switched speaker-phone integrated circuit incorporates the necessary amplifiers, attenuators, level detectors and control algorithm to form the heart of a high quality hands-free speaker-phone system.
It includes 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 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 60Hz noise in the receive channel, or for other filtering functions.
A chip disable pin permits powers down the entire circuit to conserve power on long loops where loop current is at a minimum.
The UTC MC34118 may be operated from a power supply, or it can be powered from the telephone line, requiring typically 5mA.
The UTC MC34118 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.