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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADA4945-1ACPZ-R7 датащи(PDF) 48 Page - Analog Devices |
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ADA4945-1ACPZ-R7 датащи(HTML) 48 Page - Analog Devices |
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48 / 57 page  Data Sheet ADA4945-1 analog.com Rev. A 48 of 57 Figure 103. ADA4945-1 Configured for Balanced (Differential) Inputs For an unbalanced single-ended input signal, as shown in Figure 104, the input impedance is RIN,SE = RGI β1 + β2 β1(β2 + 1) where: β1 = RG1 RG1 + RF1 β2 = RG2 RG2 + RF2 Figure 104. ADA4945-1 with Unbalanced (Single-Ended) Input For a balanced system where RG1 = RG2 = RG and RF1 = RF2 = RF, the equations simplify to β1 = β2 = RG RG+RF and R IN,SE = ( RG 1− RF 2(RG+RF) ) The input impedance of the circuit is effectively higher than it would be for a conventional op amp connected as an inverter because a fraction of the differential output voltage appears at the inputs as a common-mode signal, partially bootstrapping the voltage across the RG1 input resistor. Terminating a Single-Ended Input This section describes how to properly terminate a single-ended input to the ADA4945-1. Assume a system gain of 1 where RF1 = RF2 = RG1 = RG2 = 499 Ω, an input source with an open-circuit output voltage of 2 Vp-p, and a source resistance of 50 Ω. Figure 105 shows the circuit. 1. Calculate the input impedance. β1 = β2 = 499/998 = 0.5 and RIN = 665.33 Ω +VS ADA4945-1 +IN –IN RF RF +DIN –DIN VOCM RG RG VOUT, dm ADA4945-1 RL VOUT, dm +VS –VS RG1 RG2 RF2 RF1 VOCM RIN, SE |
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