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AD8479 Folha de dados(PDF) 11 Page - Analog Devices |
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AD8479 Folha de dados(HTML) 11 Page - Analog Devices |
11 / 16 page Data Sheet AD8479 Rev. 0 | Page 11 of 16 THEORY OF OPERATION The AD8479 is a unity-gain, differential-to-single-ended amplifier that can reject extremely high common-mode signals in excess of 600 V with 15 V supplies. The AD8479 consists of an operational amplifier (op amp) and a resistor network (see Figure 33). 2 3 4 1 7 6 8 REF(–) –IN 1MΩ AD8479 1MΩ +IN –VS NC +VS OUTPUT 5 REF(+) NOTES 1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN. Figure 33. Functional Block Diagram To achieve the high common-mode voltage range, an internal resistor divider—connected to Pin 3 and Pin 5—attenuates the noninverting signal by a factor of 60. The internal resistors at Pin 1 and Pin 2, as well as the feedback resistor, restore the gain to provide a differential gain of unity. The complete transfer function is VOUT = V (+IN) − V (−IN) Laser wafer-trimming provides resistor matching so that common-mode signals are rejected and differential input signals are amplified. To reduce output voltage drift, the op amp uses super beta tran- sistors in its input stage. The input offset current and its associated temperature coefficient contribute no appreciable output voltage offset or drift, which has the added benefit of reducing voltage noise because the corner where 1/f noise becomes dominant is below 5 Hz. To reduce the dependence of gain accuracy on the op amp, the open-loop voltage gain of the op amp exceeds 20 million V/V, and the PSRR exceeds 90 dB. |
Nº de peça semelhante - AD8479 |
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Descrição semelhante - AD8479 |
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