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MCP6N11-010 Datasheet(PDF) 9 Page - Microchip Technology |
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MCP6N11-010 Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 50 page  © 2011 Microchip Technology Inc. DS25073A-page 9 MCP6N11 1.4 DC Test Circuits 1.4.1 INPUT OFFSET TEST CIRCUIT Figure 1-6 is used for testing the INA’s input offset errors and input voltage range (VE, VIVL and VIVH; see Section 1.5.1 “Input Offset Related Errors” and Section 1.5.2 “Input Offset Common Mode Non- linearity”). U2 is part of a control loop that forces VOUT to equal VCNT; U1 can be set to any bias point. FIGURE 1-6: Test Circuit for Common Mode (Input Offset). When MCP6N11 is in its normal range of operation, the DC output voltages are (where VE is the sum of input offset errors and gE is the gain error): EQUATION 1-1: Table 1-5 gives the recommended RF and RG values for different GMIN options. 1.4.2 DIFFERENTIAL GAIN TEST CIRCUIT Figure 1-7 is used for testing the INA’s differential gain error, non-linearity and input voltage range (gE, INLDM, VDML and VDMH; see Section 1.5.3 “Differential Gain Error and Non-linearity”). RF and RG are 0.01% for accurate gain error measurements. FIGURE 1-7: Test Circuit for Differential Mode. The output voltages are (where VE is the sum of input offset errors and gE is the gain error): EQUATION 1-2: To keep VREF, VFG and VOUT within their ranges, set: EQUATION 1-3: Table 1-6 shows the recommended RF and RG. They produce a 10 k Ω load; VL can usually be left open. TABLE 1-5: SELECTING RF AND RG GMIN (V/V) Nom. RF ( Ω) Nom. RG ( Ω) Nom. GDM (V/V) Nom. GDMVOS (±V) Max. BW (kHz) Nom. 1 100k 499 201.4 0.60 2.5 2 0.40 5.0 5 100k 100 1001 0.85 2.5 10 0.50 5.0 100 0.35 35 RL VCM 100 nF VDD 2.2 µF VREF VL 12.7 k Ω VM 100 nF CCNT U1 MCP6N11 U2 MCP6H01 VCNT 63.4 k Ω RG RF RCNT 63.4 k Ω VOUT 10 nF 1k Ω 1k Ω G DM 1R F RG ⁄ + = V OUT V CNT = V M V REF G DM 1gE + ()V E + = TABLE 1-6: SELECTING RF AND RG GMIN (V/V) Nom. RF ( Ω) Nom. RG ( Ω) Nom. GDM (V/V) Nom. 10 Open 1.000 2 4.99k 4.99k 2.000 5 8.06k 2.00k 5.030 10 9.09k 1.00k 10.09 100 10.0k 100 101.0 RL 6.34 k Ω 1k Ω 1k Ω VCM +VDM/2 + 100 nF VOUT RF RG VM – 100 nF VDD 2.2 µF 6.34 k Ω VREF VFG VL VCM –VDM/2 0.01% 0.01% U1 MCP6N11 G DM 1R F RG ⁄ + = V M V OUT V REF – = V OUT V REF G DM 1gE + () V DM V E + () + = G DM 1gE + () V DM V E + () = V REF V DD G DMVDM – () 2 ⁄ = |
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