REF200 Datasheet, PDF (14/34 Pages) Burr-Brown (TI) – DUAL CURRENT SOURCE/CURRENT SINK

REF200
SBVS020B – SEPTEMBER 2000 – REVISED JULY 2015
System Examples (continued)
+V_S
100µA
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0.01µF
+V_S
33kΩ
100µA
L
o
a
d
–V_S
(a) Compliance approximate
to Gnd. HV compliance
limited by FET breakdown.
High
100µA
40kΩ
0.01µF
+V_S
5.1V
1N4689
100µA
L
27kΩ
o
a
d
–V_S
(c)
100µA
L
o
a
d
–V_S
(b) Compliance to +V_S – 5V.
1N4148
1N4148
100µA
40kΩ
0.01µF
±
±
0.01µF
40kΩ
100µA
0.01µF
40kΩ
100µA
Low
(d) Floating 200µA cascoded
current source.
1N4148
1N4148
(e) Bidirectional 200µA
cascoded current source.
NOTES: (1) FET cascoded current sources offer improved output impedance and high frequency operation. Circuit in (b)
also provides improved PSRR. (2) For current sinks (Circuits (a) and (b) only), invert circuits and use “N” channel JFETS.
Figure 23. FET Cascode Circuits
14
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