MIC6211 datasheet(11/20 Pages) MICROCHIP

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DS20006346A-page 11

MIC6211

4.0

APPLICATION INFORMATION

4.1

Common-Mode Range and Output

Voltage

The input common-mode range of the MIC6211 is from

the negative supply voltage to 1.2V below the positive

supply voltage. The output voltage swings within 1V of

the positive and negative supply voltage.

4.2

Voltage Buffer

Figure 4-1 shows a standard voltage follower/buffer.

The output voltage equals the input voltage. This circuit

is used to buffer a high impedance signal source. This

circuit works equally well with single or split supplies.

VOUT= VIN

OUT

FIGURE 4-1:

Voltage Buffer.

4.3

Inverting Amplifier

Figure 4-2 shows an inverting ampliﬁer with its gain set

by the ratio of two resistors. This circuit works best with

split supplies, but will perform with single supply

systems if the non-inverting input (+ input) is biased up

above ground.

OUT

VOUT = –VIN

⎛

⎜⎝

⎛

⎜ ⎝

FIGURE 4-2:

Inverting Amplifier.

4.4

Voltage Controlled Current Sink

Figure 4-3 is a voltage controlled current sink. A buffer

transistor forces current through a programming

resistor until the feedback loop is satisﬁed. Current ﬂow

is VIN/R. This circuit works with single or split supplies.

FIGURE 4-3:

Voltage Controlled Current

Sink.

4.5

High-Pass Filter

Figure 4-4 is an active ﬁlter with 20 dB (10×) gain and

low

frequency

cutoff

10 Hz. The

high

gain-bandwidth of the MIC6211 allows operation

beyond 100 kHz. This ﬁlter conﬁguration is designed

for split supplies.

1μF

332k

0.1μF

7.5k

VIN

VOUT

FIGURE 4-4:

High–Pass Filter.

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