MC34118 Unisonic Technologies, MC34118 Datasheet
MC34118
Available stocks
Related parts for MC34118
MC34118 Summary of contents
Page 1
... The UTC MC34118 may be operated from a power supply can be powered from the telephone line, requiring typically 5mA. The UTC MC34118 can be interfaced directly to TIP and ...
Page 2
... UTC MC34118 LINEAR INTEGRATED CIRCUIT RECOMMENDED OPERATION CONDITIONS Supply Voltage Voltage at Pin 3 Voltage at Pin 12( MUTE) Voltage at Pin 13( VLC) IVB Current( Pin 15) Attenuator Input Signal Voltage at Pin 9, Pin 21 Load Current @RXO, TXO(Pin8, Pin 22) @MCO(Pin 10) @HTO-, HTO+(Pin 6, Pin5) Ambient Operating Temperature ...
Page 3
... UTC MC34118 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATIONS PIN NAME 1 FO Filter Output. Output impedance is less than 50 ohms Filter Input. Input impedance is greater than 1 M ohms Chip Disable. A logic low (<0.8V) sets normal operation. A logic high (>2V) disable the IC to converse power ...
Page 4
... UTC MC34118 LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS PARAMETER SUPPLY VOLTAGES V+ Supply Current Vcc=6.5V, CD=0.8V Vcc=6.5V, CD=2V CD Input Resistance CD Input Voltage(High) CD Input Voltage V Output Voltage B V Output Resistance B V Power Supply Rejection Ratio B ATTENUATORS Receive Attenuator Gain(f=1kHz Mode, RXI=150mVrms Rx Mode, RXI=150mVrms ...
Page 5
... UTC MC34118 LINEAR INTEGRATED CIRCUIT PARAMETER Gain Tracking ATTENUATOR CONTROL CT Voltage( CT-V Rx Mode Idle Mode Tx Mode CT Source Current CT Sink Current CT Slow Idle Current CT Fast Idle Internal Resistance VLC Input Current Dial Tone Detector Threshold MICROPHONE AMPLIFIER( V Output Offset Open Loop Gain ...
Page 6
... UTC MC34118 LINEAR INTEGRATED CIRCUIT PARAMETER 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 Filter Voltage Offset at FO ...
Page 7
... The UTC MC34118 provides the necessary level detectors, attenuators, and switching control for a properly operating speakerphone. The detection sensitivity and timing are externally controllable ...
Page 8
... UTC MC34118 LINEAR INTEGRATED CIRCUIT LEVEL DETECTORS There are four level detectors-two on the receive side and two on the transmit side. Refer to Figure 3-the terms in parentheses form one system, and the other terms form the second system. Each level detector is a high amplifier with back-to-back diodes in the feedback path, resulting in non-linear gain, which permits operation over a wide dynamic range of speech levels ...
Page 9
... UTC MC34118 LINEAR INTEGRATED CIRCUIT attenuator is increased, such that their sum remains constant. Changing the voltage at VLC changes at CT( see the attenuator Control Block section), which in turn controls the attenuators. The volume control setting does not affect the maximum attenuator input signal at which noticeable distortion occurs. The bias current at VLC is typically 60 nA out of the pin, and does not vary significantly with the VLC voltage or with VCC ...
Page 10
... UTC MC34118 LINEAR INTEGRATED CIRCUIT A definition of the above terms: 1. “Transmit” means the transmit attenuator is fully on( +6dB). And the receive attenuator is at max. attenuation ( -46dB). 2. “Receive” means both attenuators are controlled by the volume control. At max. volume the receive attenuator is fully on( +6dB), and the transmit attenuator is at max.attenuation( -46dB). 3. “ ...
Page 11
... Diagram. The block labeled ZBal is the balancing network necessary to match the line impedance. FILTER The operation of the filter circuit is determined by the external components. The circuit within the UTC MC34118, from pins butter with a high input impedance(>1MΩ), and a low output impedance(<50Ω). The configuration of the external components determines whether the circuit is a high-pass filter( as shown in Block Diagram), a low-pass filter band-pass filter ...
Page 12
... UTC MC34118 LINEAR INTEGRATED CIRCUIT POWER SUPPLY, VB, and CHIP DISABLE The power supply voltage at Vcc( Pin between 3.5 and 6.5 volts. for normal operation, with reduced operation possible down to 2.8 volts. The output voltage at VB( Pin 15) is ~(Vcc-0.7)/2, and provides the AC ground for the system. The output impedance ~400Ω ...
Page 13
... UTC MC34118 LINEAR INTEGRATED CIRCUIT APPLICATION CIRCUIT UTC DataSheet4U.com 4 DataSheet U .com DataSheet4U.com UNISONIC TECHNOLOGIES CO., LTD. 13 QW-R108-007,B ...
Page 14
... UTC MC34118 LINEAR INTEGRATED 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 ...