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DRV632: DRV632 line driver

Part Number: DRV632
Other Parts Discussed in Thread: DRV603

Hi,

DRV632 is a line driver according to datasheet, what is line driver? because it has a charge pump inside? And what is the difference between OPA and line driver?

Thanks.

Best regards

Mason

  • Hi Mason,

    Line Drivers are devices that are purposed to drive a transmission line, like AUX outputs.

    Load impedance is usually around 600 ohm to 10-kohm, and its output is rated in Vrms instead of Watts like other amplifiers. If you need higher Vrms you can consider DRV603.
    You could consider Line Driver as a kind of OPA, but with a specific purpose.

    Charge pump on this device is used to remove the output coupling capacitor. In single-ended output / single supply the output would have a DC offset, so coupling capacitor would be required at the output. DRV632 features a charge pump to generate a negative rail so that the output is centered close to 0V.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • Hi Ivan,

    Thank you for answering me, i still have 2 question: 

    1. Why we need Vrms as a rate in line driver, rather than Watts?

    2. I know single-ended output / single supply the output would have a DC offset, but how does a coupling capacitor correct it to 0V?

    Thanks.

    Best regards

    Mason Liu

  • Mason,

    1. This is used as standard of signal integrity across considerably long distance line transmissions
    2. A series capacitor charges with the DC offset and only the AC components pass across the capacitor, that is known as DC coupling

    Further information about these things is available in the internet.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators