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Power Circuit Board Chips U209B Monolithic Integrated Control Circuitboard

Anterwell Technology Ltd.
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    Buy cheap Power Circuit Board Chips U209B Monolithic Integrated Control Circuitboard from wholesalers
     
    Buy cheap Power Circuit Board Chips U209B Monolithic Integrated Control Circuitboard from wholesalers
    • Buy cheap Power Circuit Board Chips U209B Monolithic Integrated Control Circuitboard from wholesalers
    • Buy cheap Power Circuit Board Chips U209B Monolithic Integrated Control Circuitboard from wholesalers

    Power Circuit Board Chips U209B Monolithic Integrated Control Circuitboard

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    Brand Name : ATMEL
    Model Number : U209B
    Certification : Original Factory Pack
    Price : Negotiate
    Payment Terms : T/T, Western Union,Paypal
    Supply Ability : 20000
    Delivery Time : 1
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    Power Circuit Board Chips U209B Monolithic Integrated Control Circuitboard

    Power Circuit Board Chips U209B Monolithic Integrated Control Circuitboard


    Monolithic Integrated Feature Phone Circuit

    Description

    The µc controlled telephone circuit U4090B is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, tone ringer interface with dc/dc converter, sidetone equivalent and ear protection rectifiers. The circuit is line powered and contains all components necessary for amplification of signals and adaptation to the line. An integrated voice switch with loudspeaker amplifier allows loudhearing or handsfree operation. With an anti-feedback function, acoustical feedback during loudhearing can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits.


    Features

    DC characteristic adjustable

    Transmit and receive gain adjustable

    Symmetrical input of microphone amplifier

    Anti-clipping in transmit direction

    Automatic line loss compensation

    Symmetrical output of earpiece amplifier

    Built-in ear protection

    DTMF and MUTE input

    Adjustable sidetone suppression independent of sending and receiving amplification

    Speech circuit with two sidetone networks

    Built-in line detection circuit Integrated amplifier for loudhearing operation

    Anti-clipping for loudspeaker amplifier Improved acoustical feedback suppression

    Power down


    Benefits

    Savings of one piezo electric transducer

    Complete system integration of analog signal processing on one chip

    Very few external components


    Applications

    DC line interface and supply voltage generation

    The DC line interface consists of an electronic inductance and a dual port output stage, which charges the capacitors at VMPS and VB. The value of the equivalent inductance is given by L = RSENSE CIND (RDC R30) / (RDC + R30)In order to improve the supply during worst case operating conditions two PNP current sources - IBOPT and IMPSOPT - hand an extra amount of current to the supply voltages, when the NPNs in parallel are unable to conduct current.


    A flowchart for the control of the current sources (figure 5) shows, how a priority for supply VMPS is achieved.


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