MC34118-D28-T UTC [Unisonic Technologies], MC34118-D28-T Datasheet
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MC34118-D28-T
Related parts for MC34118-D28-T
MC34118-D28-T Summary of contents
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... External resistors set microphone amplifier gain * Mute function included * Chip disable: active or standby operation * During dial tone presence: dial tone detector to inhibit receive idle mode ORDERING INFORMATION Ordering Number Normal Lead Free Plating MC34118-D28-T MC34118L-D28-T MC34118-E28-T MC34118L-E28-T MC34118-S28-T MC34118L-S28-T MC34118-S28-R MC34118L-S28-R www.unisonic.com.tw Copyright © ...
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... MC34118 PIN DESCRIPTION PIN NO PIN NAME 1 FO Output of filter. The output impedance is less than 50Ω Input of filter. The input impedance is less than 1MΩ. Chip Disable input .A logic low (voltage lower than 0.8V) sets normal operation. A logic 3 CD high (voltage higher than 2V) disable the IC. This pin’s input impedance is 90 KΩ ...
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... MC34118 BLOCK DIAGRAM MUT MCO 12 10 MCI 11 Background CPT 16 Noise Monitor TLO2 18 Level Delector RLO2 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TLI2 CT TXI TXO TLI1 Attenuator AGC Altenuator Conrol R X Attenuator RLI2 VLC RXO LINEAR INTEGRATED CIRCUIT ...
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... MC34118 ABSOLUTE MAXIMUM RATING ( PARAMETER Supply Voltage Voltage at Pin 3 Voltage at Pin 12 ( mute) Voltage at Pin 13 ( VLC) Voltage at Pin 9, Pin 21, and Pin 2 Storage Temperature Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. ...
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... MC34118 ELECTRICAL CHARACTERISTICS(Cont.) PARAMETER Transmit Attenuator Gain (f=1kHz) T Mode, T =150mVrms X XI Idle Mode, T =150mVrms Mode Range Voltage X ΔT DC Voltage XO T High Voltage XO T Low Voltage XO T Input Resistance XI Gain Tracking Attenuator Control R Mode X CT Voltage ( CT-V ) Idle Mode ...
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... MC34118 ELECTRICAL CHARACTERISTICS(Cont.) PARAMETER Level Detectors And Background Noise Monitors Transmit-Receive Switching Threshold( Ratio of Current at RLI1+RLI2 to 20μA at TLI1+TLI2 to Switch from Tx to Rx) Source Current at RLO1, RLO2, TLO1, TLO2 Sink Current at RLO1, RLO2, TLO1, TLO2 CPR, CPT Output Resistance CPR, CPT Leakage Current ...
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... The UTC MC34118 includes the necessary level detectors, attenuators, and switching control for a properly operating speakerphone. The detection sensitivity and timing can be externally controlled. The UTC MC34118 also provides background noise monitors to make the circuit insensitive to room and line noise, hybrid amplifier to interface to Tip and Ring, the microphone amplifier, and other associated functions. ...
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... MC34118 FUNCTIONAL DESCRIPTION(Cont.) BACKGROUND NOISE MONITORS To distinguish speech (consists of bursts) from background noise (a relatively constant signal level) is the main purpose of the background noise monitors. There is one background noise monitor for the receive path and another one for the transmit path. The receive background noise monitor is operated on by the RLI1-RLO1 level detector, as same as the transmit background noise monitor is operated on by the TLI2-TLO2 level detector ...
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... MC34118 FUNCTIONAL DESCRIPTION(Cont.) AGC The AGC circuit only affects the circuit under such situation: when the circuit is in the receive mode, and when V is less than 3.5v. As while the transmit and receive gains remains constant. ATTENUATOR CONTROL BLOCK This block has the seven: * C1: The output of the comparator operated by RLO2 and TLO2 (here means in microphone/ speaker side) ...
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... MC34118 FUNCTIONAL DESCRIPTION(Cont.) Definition of the above is as follows: Trems Transmit The transmit attenuator is fully on: +6dB. And the receive attenuator is at max. attenuation :-46dB Both attenuators are controlled by the volume control. At max. Volume the receive attenuator is fully Receive on: +6dB, and the transmit attenuator is at max.attenuation:-46dB. ...
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... MC34118 FUNCTIONAL DESCRIPTION(Cont.) * Switch to idle quickly, The current sources are turned off, The internal 2kΩ resistor is switched in Discharging the capacitor to VB with a time = 2kΩ x CT. * Switching to idle slowly The current sources are turned off The switch at the 2kΩ resistor is open Discharging the capacitor to VB through the external resistor RT with a time=RT x CT. ...
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... MC34118 TYPICAL APPLICATION CIRCUIT UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury ...