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AD8390AACPZ-R2 Datasheet(PDF) 10 Page - Analog Devices |
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AD8390AACPZ-R2 Datasheet(HTML) 10 Page - Analog Devices |
10 / 13 page Data Sheet AD8390A Rev. C | Page 9 of 12 THEORY OF OPERATION 56kΩ 56kΩ VCC VCC VCOM OUTP AD8390A OUTN INP INN VEE VEE C A B 56kΩ 56kΩ Figure 15. Functional Block Diagram The AD8390A is a true differential amplifier with common- mode feedback. The AD8390A is functionally equivalent to three amplifiers, as shown in Figure 15. Amplifier A and Amplifier B form a standard dual amplifier in an inverting configuration. Amplifier C maintains the common-mode voltage VCOM at the output. With VCOM left unconnected, the outputs are internally biased to midsupply. VCOM can be driven externally to set the dc output common-mode voltage. RF OUTN OUTP INP INN RG VCOM RG RL, DM VOUT, DM + – VIN, DM – + RF Figure 16. Basic Application Circuit The high open-loop gain of the AD8390A and the negative feedback minimize the differential and common-mode error voltages. With the differential and common-mode error voltages assumed to be 0, the differential-mode gain and input impedance of the basic application circuit shown in Figure 16 are as follows: G F DM IN DM OUT R R V V , , G DM IN R R 2 , |
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