OPA2810: Usage as a unity gain buffer and line driver

Uri Garbi

Part Number: OPA2810

Hello,

I have a circuit with an AC large signal input +13V to minus 13V, 50Hz. My circuit has to operate from a single +5V supply.

I divide and shift the input signal with a 3 resistor (and a reference) circuit so that +13V translates to 5V and -13V translates to 0V.

From this point I need to perform the following:

1. Introduce the signal to 3 different window comparators

2. buffer this signal to an off-circuit data acquisition instrument (flexible input voltage, high impedance)

3. buffer this signal to be introduced into the ADC of a delfino.

I would highly appreciate advice on the following:

1. the following arrangement:

2. The choice of buffer for this task.

many thanks

Uri

over 5 years ago

0 kai klaas69 over 5 years ago

Guru 140200 points

Hi Uri,

have you seen this?

slideplayer.com/.../

Kai

0 Michael Steffes over 5 years ago in reply to kai klaas69

Guru 48395 points

Hello Uri, some points,

1. nothing is really RRout so you should retarget your resistors to produce 0.2V to 4.8V.
2. Those resistors are going a add a lot of noise - maybe cut by a factor of 10 and add a cap at the V+input to bandlimit noise at about say 200Hz.
3. If your signal is really only 50Hz just look for a lower speed part that can drive 100ohm load to 4.8V, >50mA output
4. Not sure why you can't just drive all loads from one output - you might need to isolate the comparators with series R for capacitive input.

0 Uri Garbi over 5 years ago in reply to kai klaas69

Intellectual 285 points

Thanks Kai. This is helpful.

Regards

Uri

0 Uri Garbi over 5 years ago in reply to Michael Steffes

Intellectual 285 points

Thanks Folks.
This is helpful.
Regards
Uri

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OPA2810: Usage as a unity gain buffer and line driver