MIC7122 datasheet(7/8 Pages) MICREL

7 / 8 page

March 1999

MIC7122

Micrel

capacitance C

IN. The value of CFB is determined by first

estimating C

IN and then applying the following formula:

IN × CIN ≤ RFB × CFB

VIN

CFB

RFB

VOUT

CIN

RIN

Figure 2. Cancelling Feedback Phase Lag

Since a significant percentage of C

IN may be caused by board

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

FB may

change when changing from a breadboard to the final circuit

layout.

Typical Circuits

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

MIC7122 is well suited are shown in the circuit diagrams of

Figures 3 through 7.

910k

100k

VOUT

0V to V+

V+

VIN

1⁄2 MIC7122

0V to

V+

Figure 3a. Noninverting Amplifier

100

IN (V)

V+

V =+

≈ 10

Figure 3b. Noninverting Amplifier Behavior

VOUT

0V to V+

V+

VIN

0V to V+

1⁄2 MIC7122

VOUT = VIN

Figure 4. Voltage Follower/Buffer

VOUT

0V to V+

V+

VIN

0V to 2V

1⁄2 MIC7122

Ω

1⁄2W

0.5V to Q1 VCEO(sus)

IOUT

2N3904

VCEO = 40V

IC(max) = 200mA

{

Change Q1 and RS

for higher current

and/or different gain.

100mA/V as shown

OUT

Figure 5. Voltage-Controlled Current Sink

V+

100k

VOUT

V+

1⁄2 MIC7122

0.001µF

100k

V+

Figure 6. Square Wave Oscillator

330k

33k

330k

1µF

VOUT

V+

1⁄2 MIC7122

CIN

V+

COUT

330k

33k

V =−

= −

Figure 7. AC-Coupled Inverting Amplifier

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