DRV602 Datasheet, PDF (9/12 Pages) Texas Instruments – DIRECTPATH™, 2Vrms Line Driver with Adjustable gain

DRV602
www.ti.com ........................................................................................................................................................................................... SLOS572 – DECEMBER 2008
Pop-Free Power Up
Pop-free power up is ensured by keeping the SD (shutdown pin) low during power supply ramp up and down.
The EN pin should be kept low until the input ac-coupling capacitors are fully charged before asserting the EN
pin high, this way proper precharge of the ac-coupling is performed, and pop-less power-up is achieved.
Figure 10 illustrates the preferred sequence.
Supply
Supply ramp
SD
Time for ac-coupling
capacitors to charge
Figure 10. Power-Up Sequence
Capacitive Load
The DRV602 has the ability to drive a high capacitive load up to 220pF directly, higher capacitive loads can be
accepted by adding a series resistor of 10Ω or larger. The figure below shows a 10kHz signal into a 470pF
capacitor using the 10R series resistor.
Layout Recommendations
A proposed layout for the DRV602 can be seen in the DRV602EVM user's guide (SLOU248) and the Gerber files
can be downloaded on www.ti.com, open the DRV602 product folder and look in the Tools and Software folder.
The gain setting resistors, R_IN and R_fb , must be placed close to the input pins to minimize the capacitive loading
on these input pins and to ensure maximum stability of the DRV602. For the recommenced PCB layout, see the
DRV602EVM user's guide.
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): DRV602