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AD204KN Datasheet(PDF) 8 Page - Analog Devices |
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AD204KN Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page REV. D AD202/AD204 –8– Using Isolated Power. Both the AD202 and the AD204 provide ±7.5 V power outputs referenced to input common. These may be used to power various accessory circuits that must operate at the input common-mode level; the input zero adjustment 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 mA total from either or both outputs) is much more limited in current capacity than that of the AD204, but it is sufficient for operating micro- power 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 mA, a 1 mF tantalum capacitor should be used to bypass each loaded supply pin to input common. Up to 32 AD204s can be driven from a single AD246 (or equi- valent) clock driver when the isolated power outputs of the AD204s are loaded with less than 200 mA 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 additional 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. MINIMUM SUPPLY VOLTAGE 14.25 50 0 14.50 14.75 40 30 20 10 15.0 IISO = 0mA TOT AL IISO = 35mA TOT AL IISO = 70mA TOT AL IISO = 80mA OPERATION IN THIS REGION EXCEEDS 4mA LOAD LIMIT PER AD204 TOT AL Figure 14. AD246 Fanout Rules Operation at Reduced Signal Swing. Although the nominal output signal swing for the AD202 and AD204 is ±5 V, there may be cases where a smaller signal range is desirable. When that is done, the fixed errors (principally offset terms and output noise) become a larger fraction of the signal, but nonlinearity is reduced. This is shown in Figure 15. OUTPUT SIGNAL SWING – V 0 0.025 0 2 3 0.020 0.015 0.010 0.005 5 14 Figure 15. Nonlinearity vs. Signal Swing PCB Layout for Multichannel Applications. The pinout of the AD204Y has been designed to make very dense packing possible in multichannel applications. Figure 16a shows the recommended printed circuit board (PCB) layout for the simple voltage-follower connection. When gain-setting resistors are present, 0.25" channel centers can still be achieved, as shown in Figure 16b. CHANNEL INPUTS 01 2 0.1” GRID CLK COM CLK OUT COM CHANNEL OUTPUTS TO MUX Figure 16a. (NOTE: Circuit figures shown on this page are for SIP-style packages. Refer to Page 3 for proper DIP package pinout.) |
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