AMC1200 - the receiving circuit of the output of AMC1200

Dice-K

Mastermind 7642 points

Other Parts Discussed in Thread: AMC1200, TINA-TI

Hello,
I have a question about AMC1200.

I want to amplify the receiving circuit of the output of AMC1200 differentially.

DC Gain : 43/15
Power : Single 5V
Full swing

Are there recommended conditions about the receiving circuit?

For example,
Don't receive with very high impedance.
Concerning the band of the output noise, the frequency that should be performed a cut-off.

Regards,
Dice-K

over 8 years ago

0 Tom Hendrick over 8 years ago

TI__Guru**** 181901 points

Hi Again Dice-K,

Can you explain a little more or perhaps sketch out the gain configuration you are trying to achieve with the AMC1200?

0 Dice-K over 8 years ago in reply to Tom Hendrick

Mastermind 7642 points

Hello Tom,
Thank you for your reply.

The output circuit is as follows.

If there are problems, please teach me.

Best regards,
Dice-K

0 Tom Hendrick over 8 years ago in reply to Dice-K

TI__Guru**** 181901 points

Hi Dice-K,

The output of the AMC1200 is +/-2V or 4V differential, so you need to keep that in mind for the desired DIFF to SE output stage. The first circuit has too much gain for a 5V single supply amplifier and there is no biasing. The second circuit takes care of the 2.5V bias to level shift the output, but you still have potentially a little too much gain for a single 5V supply. If your BD7542 is truely rail-to-rail input and output, circuit 2 should work out fine.

0 Dice-K over 8 years ago in reply to Tom Hendrick

Mastermind 7642 points

Hello Tom,
Thank you for your reply.

BD7542 is rail-to-rail.
Does the first circuit work correctly?

If the first circuit does not work correctly, please teach me a cause and a countermeasure.

Best regards,
Dice-K

0 Tom Hendrick over 8 years ago in reply to Dice-K

TI__Guru**** 181901 points

Hi Dice-K,

The best way to teach you is to have you use the AMC1200 TINA-TI Reference Design which you can find in the 'Tools & software' folder (www.ti.com/.../toolssoftware). If you do not have TINA-TI installed on your PC, it is a free tool available here:
www.ti.com/.../tina-ti

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AMC1200 - the receiving circuit of the output of AMC1200