전자부품 데이터시트 검색엔진 |
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AD204JY 데이터시트(PDF) 8 Page - Analog Devices |
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AD204JY 데이터시트(HTML) 8 Page - Analog Devices |
8 / 12 page REV. B –8– AD202/AD204 should be made large to minimize inductance and resistance; ideally, output LO should be directly connected to a ground plane which serves as measurement common. Current spikes can be greatly reduced by connecting a small in- ductance (68 µH–100 µH) in series with the clock pin of each AD204. Molded chokes such as the Dale IM-2 series, with dc resistance of about 5 Ω, are suitable. Figure 13. Output Filter Circuit Showing Proper Grounding Using Isolated Power. Both the AD202 and the AD204 pro- vide ±7.5 V power outputs referenced to input common. These may be used to power various accessory circuits which must operate at the input common-mode level; the input zero adjust- ment pots described above are an example, and several other possible uses are shown in the section titled Application Examples. The isolated power output of the AD202 (400 µA total from ei- ther or both outputs) is much more limited in current capacity than that of the AD204, but it is sufficient for operating mi- cropower op amps, low power references (such as the AD589), adjustment circuits, and the like. The AD204 gets its power from an external clock driver, and can handle loads on its isolated supply outputs of 2 mA for each supply terminal ( +7.5 V and –7.5 V) or 3 mA for a single loaded output. Whenever the external load on either supply is more than about 200 µA, a 1 µF tantalum capacitor should be used to bypass each loaded supply pin to input common. (Circuit figures shown on this page are for SIP style pack- ages. Refer to page 3 for proper DIP package pinout.) Up to 32 AD204s can be driven from a single AD246 (or equivalent) clock driver when the isolated power outputs of the AD204s are loaded with less than 200 µA each, at a worst-case supply voltage of 14.25 V at the clock driver. The number of AD204s that can be driven by one clock driver is reduced by one AD204 per 3.5 mA of isolated power load current at 7.5 V, distributed in any way over the AD204s being supplied by that clock driver. Thus a load of 1.75 mA from +VISO to –VISO would also count as one isolator because it spans 15 V. It is possible to increase clock fanout by increasing supply volt- age above the 14.25 V minimum required for 32 loads. One ad- ditional isolator (or 3.5 mA unit load) can be driven for each 40 mV of increase in supply voltage up to 15 V. Therefore if the minimum supply voltage can be held to 15 V – 1%, it is possible to operate 32 AD204s and 52 mA of 7.5 V loads. Figure 14 shows the allowable combinations of load current and channel count for various supply voltages. Figure 14. AD246 Fanout Rules |
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