November 1999

9

MIC7300

MIC7300

Micrel

the phase lag caused by feedback resistor R

capacitance C

estimating C

R

C

R

C

IN

IN

FB

FB

×≤

×

Figure 2. Cancelling Feedback Phase Lag

Since a significant percentage of C

layout, it is important to note that the correct value of C

change when changing from a breadboard to the final circuit

layout.

Typical Circuits

Some single-supply, rail-to-rail applications for which the

MIC7300 is well suited are shown in the circuit diagrams of

Figures 3 through 7.

R2

910k

R1

100k

0V to V+

V+

2.2V to 10V

5

2

1

3

4

MIC7300

0V to

V+

Figure 3a. Noninverting Amplifier

0

100

0

100

V

V+

A1

R2

R1

≈ 10

Figure 3b. Noninverting Amplifier Behavior

0V to V+

V+

2.2V to 10V

0V to V+

5

2

1

3

4

MIC7300

Figure 4. Voltage Follower/Buffer

0V to V+

V+

2.2V to 10V

0V to 2V

5

2

1

3

4

MIC7300

10

Ω

Q1

2N3904

{

for higher current

and/or different gain.

I

V

R

100mA/V as shown

OUT

IN

S

==

Figure 5. Voltage-Controlled Current Sink

V+

0V

R4

100k

R4

100k

R3

100k

V+

5

2

1

4

3

MIC7300

C1

0.001µF

R2

100k

V+

Figure 6. Square Wave Oscillator

R3

330k

R1

33k

0V

R2

330k

R4

330k

C1

1µF

V+

5

2

1

4

3

MIC7300

V+

A

R2

R1

330k

33k

10

=

= −

Figure 7. AC-Coupled Inverting Amplifier