R2
+VS
100µA
NOTE: (1) Burr Brown® OPA602 or OPA128
0.01µF
EXAMPLES
(1)
R1
R1
R2
IOUT
IOUT = N • 100µA
100Ω
10kΩ
10kΩ
10MΩ
1MΩ
1kΩ
1nA
1µA
1mA
Use OPA128
(N • R2 )
R1
(N • R2)
IOUT = N • 100µA
(1)
R2
0.01µF
100µA
–VS
(a)
(b)
FEATURES:
(1) Zero volts shunt compliance.
(2) Adjustable only to values above
reference value.
NOTE:
IO = (N +1) 100µA
Current source/sink swing to the
“Load Return” rail is limited only
by the op amp's input common
mode range and output swing
capability. Voltage drop across “R”
can be tailored for any amplifier to
allow swing to zero volts from rail.
+VS
100µA
NR
R
0.01µF
OPA602
EXAMPLES
R
NR
IOUT
1kΩ
1kΩ
4kΩ
9kΩ
500µA
1mA
OPA602
100kΩ 9.9kΩ
10mA
NR
R
0.01µF
100µA
Reference
IO = (N +1) 100µA
–VS
(c)
(d)
IO = (N +1) 100µA
100µA
OPA602
10pF
IO = 100µA (N + 1). Compliance ≈ 3.5V
with 0.1V across R. Max IO limited by FET.
For IO = 1A, R = 0.1Ω, NR = 1kΩ.
NR
R
0.01µF
(e)
FIGURE10. AdjustableCurrentSources.
®
9
REF200
BB [ BURR-BROWN CORPORATION ]
