ADR391A AD [Analog Devices], ADR391A Datasheet - Page 17

• Manufacturer Part Number: ADR391A
• Description: Micropower, Low Noise Precision Voltage References with Shutdown
• Manufacturer: AD [Analog Devices]

CAPACITORS
Input Capacitor
Input capacitors are not required on the ADR39x. There is no
limit for the value of the capacitor used on the input, but a 1 μF
to 10 μF capacitor on the input improves transient response in
applications where the supply suddenly changes. An additional
0.1 μF in parallel also helps reduce noise from the supply.
Output Capacitor
The ADR39x does not require output capacitors for stability under
any load condition. An output capacitor, typically 0.1 μF, filters
out any low level noise voltage and does not affect the operation
of the part. On the other hand, the load transient response can
improve with the addition of a 1 μF to 10 μF output capacitor in
parallel. A capacitor here acts as a source of stored energy for a
sudden increase in load current. The only parameter that degrades
by adding an output capacitor is the turn-on time, and it depends
on the size of the capacitor chosen.
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Figure 40. ADR391 Typical Long-Term Drift over 1000 Hours
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ADR391/ADR392/ADR395
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TIME (Hours)
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