LMC7101
Typical Circuits
Some single-supply, rail-to-rail applications for which the
LMC7101 is well suited are shown in the circuit diagrams of
Figures 3 through 7.
V+
V
IN
3
2
Micrel, Inc.
V
S
0.5V to Q1 V
CEO(sus)
LMC7101
1
0V to
V+
A
V
4
5
V
OUT
0V to V+
V
IN
0V to 2V
3
2
LMC7101
1
Load
V+
V
OUT
0V to V+
I
OUT
Q1
V
CEO
= 40V
2N3904
I
C(max)
= 200mA
4
5
{
R2
900k
R1
100k
Change Q1 and R
S
for higher current
and/or different gain.
R
S
10Ω
1
⁄
2
W
Figure 3a. Noninverting Amplifier
V
I
OUT
=
IN
=
100mA/V as shown
R
S
Figure 5. Voltage-Controlled Current Sink
100
V+
R4
C1
0.001µF
A
V
= 1 +
R2
≈
10
R1
4
V
OUT
(V)
100k
V+
2
LMC7101
1
V
OUT
V+
0V
3
0
0
V
IN
(V)
100
5
Figure 3b. Noninverting Amplifier Behavior
V+
3
2
V+
R2
100k
R4
100k
R3
100k
V
IN
0V to V+
LMC7101
1
4
5
V
OUT
0V to V+
V
OUT
= V
IN
Figure 6. Square Wave Oscillator
C
IN
R1
33k
R2
330k
V+
4
2
Figure 4. Voltage Follower
LMC7101
1
C
OUT
R
L
V
OUT
0V
3
5
V+
R3
330k
C1
1µF
R4
330k
A
V
=
−
R2 330k
=
=
−
10
R1 33k
Figure 7. AC-Coupled Inverting Amplifier
LMC7101
10
February 2005
MICREL [ MICREL SEMICONDUCTOR ]
