OPA2387: Internal circuit Diagram of the component

ASHWIN SHARMA

Part Number: OPA2387
Other Parts Discussed in Thread: OPA387, ADS1299, OPA397, OPA2392, OPA2376, OPA2391, TLV2376

Tool/software:

Hello,

we are designing a EEG Device ,where the device is suitable for EEG device as pre amplifier in AFE. And also please provide the OPA2387 Internal circuit Diagram of the dual supply component and gain of the component

2 months ago

0 Marek Lis 2 months ago

TI__Guru 63050 points

Ashwin,

The equivalent input circuit of OPA387 is shown below.

If you want to know more details regarding the core of the op amp, please review the application brief under following link:

https://www.ti.com/lit/ab/sboa182c/sboa182c.pdf?ts=1721919730116&ref_url=https%253A%252F%252Fwww.google.com%252F#:~:text=Zero%2Ddrift%20amplifiers%20provide%20ultra,general%20purpose%20and%20precision%20applications.

0 ASHWIN SHARMA 2 months ago in reply to Marek Lis

Prodigy 40 points

Hello,

Thank you Sir

what about the Gain, how to adjust the gain in OPA2387

0 ASHWIN SHARMA 2 months ago in reply to Marek Lis

Prodigy 40 points

Hello Sir,

Is there any specific figure or point directly labeled "Gain" in the OPA2387

0 ASHWIN SHARMA 2 months ago in reply to Marek Lis

Prodigy 40 points

Hello Sir,

Is it suitable for EEG device as pre amplifier for ADS1299?

0 Marek Lis 2 months ago in reply to ASHWIN SHARMA

TI__Guru 63050 points

The close-loop gain of any op amp is set by the choice of external resistors. OPA2387 is a chopper amplifier with internal auto-calibration circuitry, which is not recommended for very high source impedance of active electrodes used in EEG/ECG applications due to commutation of IB spikes into voltage noise. Thus, I would recommended package-level trimmed parts (eTrim) like OPA2392, OPA397, OPA2391, OPA2376 or TLV2376.

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OPA2387: Internal circuit Diagram of the component