LM61

SNIS121I – JUNE 1999 – REVISED FEBRUARY 2013

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Capacitive Loads

The LM61 handles capacitive loading well. Without any special precautions, the LM61 can drive any capacitive

load as shown in Figure 15. Over the specified temperature range the LM61 has a maximum output impedance

of 5 k

Ω. In an extremely noisy environment it may be necessary to add some filtering to minimize noise pickup. It

is recommended that 0.1

Figure 16. In a noisy environment it may be necessary to add a capacitor from the output to ground. A 1

μF

output capacitor with the 5 k

Ω maximum output impedance will form a 32 Hz lowpass filter. Since the thermal

time constant of the LM61 is much slower than the 5 ms time constant formed by the RC, the overall response

time of the LM61 will not be significantly affected. For much larger capacitors this additional time lag will increase

the overall response time of the LM61.

Figure 15. LM61 No Decoupling Required for Capacitive Load

Figure 16. LM61 with Filter for Noisy Environment

Figure 17. Simplified Schematic

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