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LT1002AM Datasheet(PDF) 10 Page - Linear Technology |
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LT1002AM Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  10 LT1002 APPLICATIONS INFORMATION Advantages of Matched Dual Op Amps In many applica- tions the performance of a system depends on the match- ing between two operational amplifiers rather than the individual characteristics of the two op amps. Two or three op amp instrumentation amplifiers, tracking voltage refer- ences and low drift active filters are some of the circuits requiring matching between two op amps. The well-known triple op amp configuration illustrates these concepts. Output offset is a function of the differ- ence between the offsets of the two halves of the LT1002. This error cancellation principle holds for a considerable number of input referred parameters in addition to offset voltage and its drift with temperature. Input bias current will be the average of the two non-inverting input currents (IB+). The difference between these two currents (IOS+) is the offset current of the instrumentation amplifier. The difference between the inverting input currents (IOS–) will cause errors flowing through R1, R2, and R3. Common- mode and power supply rejections will be dependent only on the match between the two amplifiers (assuming perfect resistor matching). 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 = +1.0µV/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 LT1002, by specifying and guaranteeing all of these matching parameters, can significantly improve the performance of matching dependent circuits. 1002 TA07 R1 10k 1% R4 100 Ω 1% R6 10k 1% R5 100 Ω 1% INPUT OUTPUT – + Gain = 1000 – + A 1/2 LT1002 – + B 1 /2 LT1002 LT1037 – INPUT + R2 10k 1% R7 R9 9.76k 1% R3 R8 2.1k 1% C1 100pF R10 100k 200 Ω 200 Ω Three Op Amp Instrumentation Amplifier Trim R8 for gain Trim R9 for DC common mode rejection Trim R10 for AC common mode rejection Typical performance of the instrumentation amplifier: Input offset voltage = 25 µV Input bias current = 0.7nA Input resistance = 200 G Ω Input offset current = 0.6nA Input noise = 0.5 µV p-p Power bandwidth (V0 = ±10V) = 80kHz |
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