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MCP6H02 датащи(PDF) 20 Page - Microchip Technology |
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MCP6H02 датащи(HTML) 20 Page - Microchip Technology |
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20 / 40 page ![]() MCP6H01/2/4 DS22243C-page 20 © 2011 Microchip Technology Inc. 4.7.2 TWO OP AMP INSTRUMENTATION AMPLIFIER The MCP6H01/2/4 op amps are well suited for conditioning sensor signals in battery-powered applications. Figure 4-9 shows a two op 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. V OUT V 1 V 2 – () 1 R 1 R 2 ------ 2R 1 R G --------- ++ ⎝⎠ ⎛⎞ V REF + = VREF R1 R2 R2 R1 VOUT RG V2 V1 ½ MCP6H02 ½ MCP6H02 D1 Light VOUT VDD R2 C2 ID1 VOUT = ID1*R2 – + MCP6H01 |
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