ISL59112IEZ-T7 View Datasheet(PDF) - Renesas Electronics
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Description
Manufacturer
ISL59112IEZ-T7 Datasheet PDF : 8 Pages
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ISL59112
Power Supply Bypassing Printed Circuit Board
Layout
As with any modern operational amplifier, a good printed circuit
board layout is necessary for optimum performance. Lead
lengths should be as short as possible. The power supply pin
must be well bypassed to reduce the risk of oscillation. For
normal single supply operation, where the VS- pin is connected
to the ground plane, a single 4.7µF tantalum capacitor in
parallel with a 0.1µF ceramic capacitor from VS+ to GND will
suffice. This same capacitor combination should be placed at
each supply pin to ground if split supplies are to be used. In
this case, the VS- pin becomes the negative supply rail.
Printed Circuit Board Layout
For good AC performance, parasitic capacitance should be
kept to minimum. Use of wire wound resistors should be
avoided because of their additional series inductance. Use of
sockets should also be avoided if possible. Sockets add
parasitic inductance and capacitance that can result in
compromised performance. Minimizing parasitic capacitance
at the amplifier's inverting input pin is very important. The
feedback resistor should be placed very close to the inverting
input pin. Strip line design techniques are recommended for
the signal traces.
FN6142 Rev 4.00
March 15, 2007
Page 7 of 8
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