MC34118DWR2 Freescale Semiconductor, MC34118DWR2 Datasheet
MC34118DWR2
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MC34118DWR2 Summary of contents
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MOTOROLA SEMICONDUCTOR TECHNICAL DATA ARCHIVED - 6/2010 Voice Switched Speakerphone Circuit Silicon Monolithic Integrated Circuit The MC34118 Voice Switched Speakerphone Circuit incorporates the necessary amplifiers, attenuators, level detectors, and control algorithm to form the heart of a high quality hands--free ...
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ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage (Pin 4) Voltage at CD (Pin 3), MUT (Pin 12) Voltage at VLC (Pin 13) Voltage at TXI (Pin 9), RXI (Pin 21), FI (Pin 2) Storage Temperature Range Devices should not be operated ...
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ELECTRICAL CHARACTERISTICS (T Parameter ATTENUATORS (continued 25°C) A Transmit Attenuator Gain (f = 1.0 kHz) Tx Mode, TXI = 150 mVrms Idle Mode, TXI = 150 mVrms Range ( Mode) TXO DC Voltage (Tx Mode) ...
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Parameter LEVEL DETECTORS AND BACKGROUND NOISE MONITORS Transmit--Receive Switching Threshold (Ratio of Current at RLI1 + RLI2 to 20 µA at TLI1 + TLI2 to switch from Tx to Rx) Source Current at RLO1, RLO2, TLO1, TLO2 Sink Current at ...
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Pin Name Description 1 FO Filter output. Output impedance is less than 50 ohms Filter input. Input impedance is greater than 1.0 Mohm Chip Disable. A logic low (< 0.8 V) sets normal operation. A logic ...
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MC34118 6 Figure 2. MC34118 Block Diagram MOTOROLA ...
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INTRODUCTION The fundamental difference between the operation of a speakerphone and a handset is that of half--duplex versus full--duplex. The handset is full duplex since conversation can occur in both directions (transmit and receive) simulta- neously. A speakerphone has higher ...
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RLI1 (TLI2 5.1 k SIGNAL INPUT 0.1 µF 0.1 µF SIGNAL INPUT 5 TLI1 + V B (RLI2) speaker amplifier. On the transmit side, one level detector (TLI2 the output of the ...
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By disabling the receive idle mode, the dial tone remains at the normally expected full level. ...
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To switch to idle quickly (fast idle), the current sources are turned off, and the internal 2.0 kΩ resistor is switched in, discharging the capacitor 2 — To switch to ...
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With an appropriate choice of an input coupling capacitor to the low pass filter, a band pass filter is formed. 4.0 k 220 3 0.001 ...
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0.1 µ 0.1 µF 120 1.0 kHz (RLO1, RLO2 TLO1, TLO2 INPUT ...
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CD ≤ 1.0 2.0 3.0 4.0 V (VOLTS) CC Figure 18. Supply Current versus Supply Voltage 220 µ 300 1.0K FREQUENCY (Hz) Figure 20. ...
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DESIGN GUIDELINES SWITCHING TIME The switching time of the MC34118 circuit is dominated by the components at C (Pin 14, refer to Figure 6), and sec- T ondarily by the capacitors at the level detector outputs (RLO1, RLO2, TLO1, TLO2). ...
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MOTOROLA + + Figure 23. MC34118 Application Circuit (Basic Line Powered Speakerphone MC34118 15 ...
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MIKE V M AMP TLI2 -- + ACOUSTIC ( COUPLING + -- RLI2 SPEAKER AMP. Figure 24. Basic Block Diagram for Design Purposes amplified as soon as possible ...
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V/V gain terms. The speaker amplifier gain is divided by two since G ferential gain of the amplifier, and V 3 side of that output. The current I , coming from the ...
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dB. Experience has shown, however, that AC--MAX an acoustic coupling loss of > desirable. — The M line helps define the maximum sidetone cou- TX pling (G ) allowed in the system, which ...
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The circuit is powered entirely by the telephone line’s loop current, and its charac- teristics are shown in Figures 8.0 4 LOOP CURRENT (mA) ...
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Ring, through the microphone wiring to the microphone am- plifier, or through any of the PC board traces. The most sen- sitive pins on the MC34118 are the inputs to the level detectors (RLI1, RLI2, TLI1, TLI2) since, when there ...
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PIN 1 IDENT e B 0.025 MOTOROLA PACKAGE DIMENSIONS P SUFFIX PLASTIC PACKAGE CASE 710- -02 ISSUE B 28 PDIP ...
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Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of ...