HA2520 OP AMPS

Discussion in 'General Electronics Chat' started by marims, Jan 3, 2009.

  1. marims

    Thread Starter Member

    Jan 27, 2008
    15
    0
    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.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Why don't you post a schematic of what you have? A picture is worth a thousand words...
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    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?
     
  4. marims

    Thread Starter Member

    Jan 27, 2008
    15
    0
    Thanks for your reply.

    Range will be up to 10MHZ

    Regards
    Marims
     
  5. marims

    Thread Starter Member

    Jan 27, 2008
    15
    0
    my schematic is as in the attachment.

    Thank U
     
  6. marims

    Thread Starter Member

    Jan 27, 2008
    15
    0
    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
     
  7. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Have you got a data sheet for the op amp? It usually gives common configurations.
     
  8. italo

    New Member

    Nov 20, 2005
    205
    1
    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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