HA2520 OP AMPS

Thread Starter

marims

Joined Jan 27, 2008
15
Hi

I am trying to use IC HA2520 as Gain of Ten Amplifier for my Waveform Generator circuit. Expected output after amplification is 5V peak-peak.
when I connected this IC to my circuit the output doesn't show up at the output pin.

I have connected my circuit as follows

Pin2 - Input
pin3 - Analog Gnd
pin4 - (-18V)
pin7 - (+18V)

Output pin 6.

I am using 1K for input at pin2.

Pin2 and pin 6 are connected to 10K Pot.

100PF disc is connected to pin 6 and Gnd.

This circuit works well for IC LF351

It is not working for HA2520.

can somebody tel me what I should do.

What is the purpose of other pins 1,5 and 8

Please post a circuit diagram

I am desperate to make this circuit work

I have attached the Datasheet.

Please help me.
 

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SgtWookie

Joined Jul 17, 2007
22,201
Why don't you post a schematic of what you have? A picture is worth a thousand words...
 

beenthere

Joined Apr 20, 2004
15,808
The op amp is not internally compensated, and is intended for high frequency operation - up to 20 MHz. It will not substitute in for an LF351. What is the range of frequencies you need to cover?
 

Thread Starter

marims

Joined Jan 27, 2008
15
Thanks for your reply.

Range will be up to 10MHZ

Regards
Marims
 

Thread Starter

marims

Joined Jan 27, 2008
15
Hi beenthere

I understand that I need to add resistors and capacitors for external
compensation.I will be grateful to you if you could post me a schematic /
suggest me a site.

regards
Mariappan
 

beenthere

Joined Apr 20, 2004
15,808
Have you got a data sheet for the op amp? It usually gives common configurations.
 

italo

Joined Nov 20, 2005
205
Usualy a 500 Ω to gnd from pin 3 is a good idea for ballacing the input . remove any caps fron the output. add a 180 and .00560 pfd to gnd as compensation. I still believe that a better amplifier can be found. try maxim in that kind of pachage 500 mhz is possible.
 
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