Datenblatt-Suchmaschine für elektronische Bauteile |
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AD204JN Datenblatt(PDF) 6 Page - Analog Devices |
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AD204JN Datenblatt(HTML) 6 Page - Analog Devices |
6 / 12 page REV. B –6– AD202/AD204 work for any gain. Keep the resistance in series with input LO below a few hundred ohms to avoid CMR degradation. Figure 8a. Adjustments for Noninverting Connection of Op Amp Also shown in Figure 8a is the preferred means of adjusting the gain-setting network. The circuit shown gives a nominal RF of 50 k Ω, and will work properly for gains of ten or greater. The adjustment becomes less effective at lower gains (its effect is halved at G = 2) so that the pot will have to be a larger fraction of the total RF at low gain. At G = 1 (follower) the gain cannot be adjusted downward without compromising input resistance; it is better to adjust gain at the signal source or after the output. Figure 8b shows adjustments for use with inverting input cir- cuits. The zero adjustment nulls the voltage at the summing node. This method is preferable to current injection because it is less affected by subsequent gain adjustment. Gain adjustment is again done in the feedback; but in this case it will work all the way down to unity gain (and below) without alteration. Figure 8b. Adjustments for Summing or Current Input Figure 9 shows how zero adjustment is done at the output by taking advantage of the semi-floating output port. The range of this adjustment will have to be increased at higher gains; if that is done, be sure to use a suitably stable supply voltage for the pot circuit. There is no easy way to adjust gain at the output side of the iso- lator itself. If gain adjustment must be done on the output side, it will have to be in a following circuit such as an output buffer or filter. Figure 9. Output-Side Zero Adjustment Common-Mode Performance. Figures 10a and 10b show how the common-mode rejection of the AD202 and AD204 var- ies with frequency, gain, and source resistance. For these isola- tors, the significant resistance will normally be that the path from the source of the common-mode signal to IN COM. The AD202 and AD204 also perform well in applications requiring rejection of fast common-mode steps, as described in the Appli- cations section. Figure 10a. AD204 (Circuit figures shown on this page are for SIP style pack- ages. Refer to page 3 for proper DIP package pinout.) |
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