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LM 3900

Quad Amplifier

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Description: It is important to stress that the LM3900 is not a regular quad opamp: instead of Vout = A*(Vin+ - Vin-) (which is what a regular opamp does; the output voltage equals A times the voltage difference between the +/- input terminals) the LM3900 basically delivers Vout = A*(Iin+ - Iin-), i.e. the output voltage equals A times the input current difference between the +/- inputs. As a consequence the LM3900 as low-impedance inputs, in contrast to regular opamps which should have high-impedance inputs.

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Files
LM2900.pdf
   Datasheet for LM2900, LM3900, and LM3301
AN-72.pdf
   Application notes on the LM2900
AB-24.pdf
   Bench testing LM3900 and LM359 Input Parameters
Manufacturers
National Semiconductor
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