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DG611DJ Datasheet(PDF) 8 Page - Vishay Siliconix |
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DG611DJ Datasheet(HTML) 8 Page - Vishay Siliconix |
8 / 15 page www.vishay.com 8 Document Number: 70057 S11-0154-Rev. I, 31-Jan-11 Vishay Siliconix DG611, DG612, DG613 TEST CIRCUITS APPLICATIONS High-Speed Sample-and-Hold In a fast sample-and-hold application, the analog switch characteristics are critical. A fast switch reduces aperture uncertainty. A low charge injection eliminates offset (step) errors. A low leakage reduces droop errors. The CLC111, a fast input buffer, helps to shorten acquisition and settling times. A low leakage, low dielectric absorption hold capacitor must be used. Polycarbonate, polystyrene and polypropylene are good choices. The JFET output buffer reduces droop due to its low input bias current. (see figure 5.) Pixel-Rate Switch Windows, picture-in-picture, title overlays are economically generated using a high-speed analog switch such as the DG613. For this application the two video sources must be sync locked. The glitch-less analog switch eliminates halos. (see figure 6.) GaAs FET Drivers Figure 7 illustrates a high-speed GaAs FET driver. To turn the GaAs FET on 0 V are applied to its gate via S1, whereas to turn it off, - 8 V are applied via S2. This high-speed, low-power driver is especially suited for applications that require a large number of RF switches, such as phased array radars. Figure 3. Charge Injection CL 1 nF D Rg VO V+ S V- 5 V IN VL Vg - 3 V GND + 15 V + 5 V Figure 4. Crosstalk S1 D2 S2 VS 1 V, 4 V VO IN2 Rg = 50 1 V, 4 V XTALK Isolation = 20 log VS VL VO V+ IN1 50 C = RF bypass RL D1 - 3 V GND V- NC C + 15 V C + 5 V C Figure 5. High-Speed Sample-and-Hold CLC111 75 + - LF356 1/4 DG611 5 V Control Analog Input Input Buffer S IN D Output Buffer ± 5 V Output to A/D + 5 V + 12 V - 5 V CHOLD 650 pF Polystyrene |
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