Need amplifier like OP497 but smaller size

KoleD on Feb 23, 2015

We have had success in building an amplification circuit with the OP497 G class amplifier. Our application is amplifying a very low current DC input signal from a photodiode which will be charge integrated after the output in a CAEN V792N QDC card.

We are looking for something a little smaller in size to fit on our amp boards. We still need low input bias current and a quad op-amp package with 14 pins. Do you have an amplifier like the OP497, or a smaller version of the OP497? The approximate dimensions are 4mm x 8mm (package only, without pins). For reference, we need something the same size as the LT1817S amplifier:

http://cds.linear.com/docs/en/datasheet/181567fb.pdf

(See page 19 for dimensions on "S-package").

Thanks!

0 krisf

on Feb 23, 2015 10:18 PM over 6 years ago
Hi Kole,

Do you already have a board fabricated? Can your board accommodate something slightly wider? I believe the AD8624 will perform very closely to the OP497. The size of the IC is 4.4mmx5mm, please see Figure 62 on the datasheet. If you require a package with the exact dimensions of 4mmx8mm though, I can recommend something else.

Thanks,

Kris
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0 KoleD on Feb 25, 2015 2:44 AM over 6 years ago

Kris,

Thanks for the reply! The specs on the AD8624 look like they will work great. However, we do have a board fabricated so unfortunately we need an IC a little closer to the exact dimensions.

The dimensions given on the link I shared above are (8.560-8.738)mm length, (3.810-3.998)mm width and (5.791-6.197)mm width with pins. Additionally, the spacing is 1.270mm between each pin. Something closer to this would be great.

-Kole
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0 krisf

on Feb 26, 2015 12:16 AM over 6 years ago
Hi Kole,

What supply will you be using? Also, I assume that since you're taking DC measurements, you don't need too high a bandwidth?

Thanks,

Kris
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0 KoleD on Feb 28, 2015 12:57 AM over 6 years ago

We will be using +/- 5V DC power supply. That is correct about the bandwidth.
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0 krisf

on Mar 1, 2015 7:38 PM over 6 years ago
Hi Kole,

You could take a look at the AD8669 or the AD8659. The AD8669 is more similar to the OP497, so i would check that out first. The package you are looking for is the 14-lead SOIC-N.

Please let me know if these amplifiers will cater to the needs of your applications.

Thanks!

Kris
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