AMC1400: Isolated current output <= 20mA

Carolyn Christiansen

Part Number: AMC1400
Other Parts Discussed in Thread: AMC3302, AMC3301, AMC3311, AMC3330

Tool/software:

Hello,

For my application (transcutaneous electrical stimulation) I need an analog sine wave output of 0-20mA. This must be an isolated, amplified version of an analog sine wave input signal that I can choose to be voltage or current. Ideally, the isolated output power would be integrated or not needed (as in the case of a transformer).

One way to accomplish this may be to have a current input into a current transformer with a 1:1 ratio. However, most current transformers seem designed to sense high currents and they step down the current quite a bit.

Another possibility would be some sort of analog isolation amplifier with integrated power, but I can only find digital isolation amplifiers with integrated power.

Does TI make any possible solutions for this?

Thank you for your time.

2 months ago

0 Saleh Ahmad 2 months ago

TI__Expert 6430 points

Hi Carolyn,

Please take a look at our AMC33xx devices. Those are isolated amplifiers with integrated power. (AMC3330, AMC3301, AMC3302, AMC3311)

Thanks.

0 Carolyn Christiansen 2 months ago in reply to Saleh Ahmad

Prodigy 10 points

Hi Saleh,

Thank you for your response. Those are some great options with a voltage output.

Are you aware of anything similar that has integrated power but an isolated current output?

0 Saleh Ahmad 2 months ago in reply to Carolyn Christiansen

TI__Expert 6430 points

Hi Carolyn,

Our devices have mainly 3 types of outputs.

The amplifier devices have an analog output, and typically you would read the output with your MCU's ADC.

The modulator devices have a bitstream output, which would need to be decoded. This is usually done with an MCU with a SDFM module in it.

We also have devices with a SPI interface for the output.

Can you share why an isolated current output is needed?

Thanks.

0 Carolyn Christiansen 1 month ago in reply to Saleh Ahmad

Prodigy 10 points

Hi Saleh,

Thank you for that information - it is very useful in understanding the devices. My application is nerve stimulation, and I have learned that I need to explore transformers for my isolated output. Thank you for your time and information.

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AMC1400: Isolated current output <= 20mA