SN65C3223E: ripple on V+ and V-

Hans

Genius 12865 points

Part Number: SN65C3223E

Hello Team,

I observe a ripple voltage of 200mV at ~11kHz on pins V+ and V- at 3.3V Vcc and 4 x 100n caps; no load!

Shouldn't that be almost flat at no load or is that within the specification, please?

Thanks and Best Regards,

Hans

over 8 years ago

0 Hao L over 8 years ago

TI__Mastermind 25705 points

Hans,

To generate V+ and V- voltages from the supply, there is a charge pump circuitry internally. Even without load, the charge pump works to keep the output voltage level. You can refer to this post for some technical details and test waveforms.

http://e2e.ti.com/support/interface/rs232/f/392/t/463809

Please let me know if you have more questions.

Regards,

Interface

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SN65C3223E: ripple on V+ and V-