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LT1112 Datasheet(PDF) 11 Page - Linear Technology |
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LT1112 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  11 LT1112/LT1114 111214fb The concepts of common mode and power supply rejec- tion ratio match ( ∆CMRR and ∆PSRR) are best demon- strated with a numerical example: Assume CMRRA = + 1µV/V or 120dB, and CMRRB = + 0.75µV/V or 122.5dB, then ∆CMRR = 0.25µV/V or 132dB; if CMRRB = – 0.75µV/V which is still 122.5dB, then ∆CMRR = 1.75µV/V or 115dB. Clearly the LT1112/LT1114, by specifying and guarantee- ing all of these matching parameters, can significantly improve the performance of matching-dependent circuits. Three Op Amp Instrumentation Amplifier APPLICATIO S I FOR ATIO – + 1/2 LT1112 OR 1/4 LT1114 A 1/2 LT1112 OR 1/4 LT1114 D IN– IN+ R1 10k 1% R3 2.1k 1% R8 200 Ω R2 10k 1% R4 100 Ω 0.5% R5 100 Ω 0.5% C1 33pF R10 1M R6 10k 0.5% R7 9.88k 0.5% R9 200 Ω OUTPUT LT1097 OR 1/4LT1114 B OR C GAIN = 1000 TRIM R8 FOR GAIN TRIM R9 FOR DC COMMON MODE REJECTION TRIM R10 FOR AC COMMON MODE REJECTION LT1112/14 • AI02 Typical performance of the instrumentation amplifier: Input offset voltage = 35 µV Offset voltage drift = 0.3 µV/°C Input bias current = 80pA Input offset current = 100pA Input resistance = 800G Ω Input noise = 0.42 µVP-P When the instrumentation amplifier is used with high impedance sources, the LT1114 is recommended because its CMRR vs frequency performance is better than the LT1112’s. For example, with two matched 1M Ω source resistors, CMRR at 100Hz is 100dB with the LT1114, 76dB with the LT1112. This difference is explained by the fact that capacitance between adjacent pins on an IC package is about 0.25pF (including package, socket and PC board trace capaci- tances). On the dual op amp package, positive input A is next to the V – pin (AC ground), while positive input B has no AC ground pin adjacent to it, resulting in a 0.25pF input capacitance mismatch. At 100Hz, 0.25pF represents a 6.4 • 109 input impedance mismatch, which is only 76dB higher than the 1M Ω source resistors. On the quad package, all four inputs are adjacent to a power supply terminal—therefore, there is no mismatch. |
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