APPLICATION NOTES

HEAT SINKING

Since the case of the MSK 0032 only runs approximately

40°C hotter than the ambient temperature, a heat sink is gen-

erally not necessary. However, in applications where it is criti-

cal to minimize input bias current, a heat sink may be used.The

case of the MSK 0032 is isolated from the internal circuitry so

the heat sink may be attached directly to the case. The heat

sink may however create enough parasitic capacitance at the

pins to necessitate adjusting the amount of compensation used.

COMPENSATION

When replacing an LH0032 or TP0032 with an MSK 0032,

no changes in compensation need be made. The MSK 0032

will demonstrate greater loop stability than the LH0032 and

loop stability very similar to the TP0032. As with any opera-

tional amplifier, a feedback capacitor in the range of 2-10pF is

recommended to compensate for the effect of the R-C time

constant created by the input capacitance of the op-amp and

the feedback and input resistors in an inverting configuration.

See Figure 3 and Figure 4 for recommended compensation

schemes for non-inverting configurations.

POWER SUPPLY BYPASSING

Both the negative and the positive power supplies must be

effectively decoupled with a high and low frequency bypass

circuit to avoid power supply induced oscillation. An effective

decoupling scheme consists of a 0.1 microfarad ceramic ca-

pacitor in parallel with a 4.7 microfarad tantalum capacitor from

each power supply pin to ground.

The input offset voltage of the MSK 0032 is typically less

than ±0.5mV. If it is necessary to null the offset to zero or

some value other than zero, the above circuit is recommended.

Typical offset adjust range is 25mV.

INPUT OFFSET VOLTAGE NULL

Figure 1

Figure 4

Figure 2

Output Short Circuit Protection

Rev. C 9/06

3

Figure 3