ISL24020 Datasheet, PDF (9/10 Pages) Intersil Corporation – Low Cost, 60MHz Rail-to-Rail Input-Output Op-Amp

ISL24020
Where:
• i = 1 to 2 for dual and 1 to 4 for quad
• V_S = Total supply voltage
• I_SMAX = Maximum supply current per amplifier
• V_OUTi = Maximum output voltage of the application
• I_LOADi = Load current
If we set the two P_DMAX equations equal to each other, we
can solve for R_LOADi to avoid device overheat.
Unused Amplifiers
It is recommended that any unused amplifiers in a dual and
a quad package be configured as a unity gain follower. The
inverting input should be directly connected to the output
and the non-inverting input tied to the ground plane.
Power Supply Bypassing and Printed Circuit
Board Layout
The ISL24020 can provide gain at high frequency. As with
any high-frequency device, good printed circuit board layout
is necessary for optimum performance. Ground plane
construction is highly recommended, lead lengths should be
as short as possible and the power supply pins must be well
bypassed to reduce the risk of oscillation. For normal single
supply operation, where the V_S- pin is connected to ground,
a 0.1µF ceramic capacitor should be placed from V_S+ to pin
to V_S- pin. A 4.7µF tantalum capacitor should then be
connected in parallel, placed in the region of the amplifier.
One 4.7µF capacitor may be used for multiple devices. This
same capacitor combination should be placed at each
supply pin to ground if split supplies are to be used.
9
FN6735.0
October 2, 2008