AD795
Rev. C | Page 11 of 20
MINIMIZING INPUT CURRENT
The AD795 is guaranteed to 1 pA maximum input current
with ±15 V supply voltage at room temperature. Careful atten-
tion to how the amplifier is used is necessary to maintain this
performance.
The amplifier’s operating temperature should be kept as low as
possible. Like other JFET input amplifiers, the AD795’s input
current doubles for every 10°C rise in junction temperature
(illustrated in Figure 9). On-chip power dissipation raises the
device operating temperature, causing an increase in input
current. Reducing supply voltage to cut power dissipation
reduces the AD795’s input current (see Figure 7). Heavy output
loads can also increase junction temperature; maintaining a
minimum load resistance of 10 kΩ is recommended.
