Datasheet

®
REF200
9
R
100µA
Reference
–V
100µA
S
R
2
0.01µF
R
(N • R )
2
1
I = N • 100µA
OUT
(1)
R
(N • R )
2
1
I = N • 100µA
OUT
(1)
100µA
0.01µF
R
2
+V
S
+V
100µA
S
OPA602
0.01µF
NR
I = (N +1) 100µA
O
R
0.01µF
NR
I = (N +1) 100µA
O
R
100µA
OPA602
0.01µF
NR
I = (N +1) 100µA
O
10pF
(a) (b)
(d)(c)
(e)
–V
S
OPA602
RNRI
OUT
1kΩ 4kΩ 500µA
1kΩ 9kΩ 1mA
100kΩ 9.9kΩ 10mA
EXAMPLES
FEATURES:
(1) Zero volts shunt compliance.
(2) Adjustable only to values above
reference value.
NOTE:
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.
NOTE: (1) Burr Brown
®
OPA602 or OPA128
EXAMPLES
R
1
R
2
I
OUT
100Ω 10MΩ 1nA
10kΩ 1MΩ 1µA
10kΩ 1kΩ 1mA
Use OPA128
I
O
= 100µA (N + 1). Compliance ≈ 3.5V
with 0.1V across R. Max I
O
limited by FET.
For I
O
= 1A, R = 0.1Ω, NR = 1kΩ.
FIGURE 10. Adjustable Current Sources.