MCP6H01 datasheet(20/40 Pages) MICROCHIP

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MCP6H01/2/4

DS22243C-page 20

4.7.2

TWO OP AMP INSTRUMENTATION

AMPLIFIER

The MCP6H01/2/4 op amps are well suited for

conditioning

sensor

signals

battery-powered

applications.

Figure 4-9

shows

two

amp

instrumentation amplifier using the MCP6H02, which

works well for applications requiring rejection of

common mode noise at higher gains.

To ensure proper operation, the op amp common mode

input voltage must be kept within the allowed range.

The reference voltage (VREF) is supplied by a low-

impedance source. In single-supply applications, VREF

is typically VDD/2.

FIGURE 4-9:

Two Op Amp

Instrumentation Amplifier.

To obtain the best CMRR possible, and not limit the

performance by the resistor tolerances, set a high gain

with the RG resistor.

4.7.3

PHOTODETECTOR AMPLIFIER

The MCP6H01/2/4 op amps can be used to easily

convert the signal from a sensor that produces an

output current (such as a photo diode) into voltage (a

trans-impedance amplifier). This is implemented with a

single resistor (R2) in the feedback loop of the

amplifiers shown in Figure 4-10. The optional capacitor

(C2) sometimes provides stability for these circuits.

A photodiode configured in Photovoltaic mode has a

zero voltage potential placed across it. In this mode,

the light sensitivity and linearity is maximized, making it

best suited for precision applications. The key amplifier

specifications for this application are: low input bias

current, common mode input voltage range (including

ground), and rail-to-rail output.

FIGURE 4-10:

Photodetector Amplifier.

OUT

–

() 1

------

---------

⎝⎠

⎛⎞

REF

VREF R1

VOUT

MCP6H02

Light

VOUT

VDD

ID1

VOUT = ID1*R2

–

MCP6H01

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