
266
Current source applications for the LM134
tions, is naturally affected at very low currents. National states that at an I
set
level of 1
mA, the slew rate is 1 V/µS, but at 10 µA this drops to around 10 mV/µS.
10.2 Current source
applications for the LM134
Figures 10.4 to 10.11 and also 10.18
show several diverse current source applications
for the LM134. In Figure 10.4, the LM134/334 is used to set the bias current for a
micropower, programmable op amp, such as National’s LM4250. Programmable op
amps such as this are useful in many low-power applications. With the LM4250, a sin-
gle bias-setting resistor programs the quiescent power consumption. ...