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AD204 bảng dữ liệu(PDF) 4 Page - Analog Devices |
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AD204 bảng dữ liệu(HTML) 4 Page - Analog Devices |
4 / 12 page REV. D AD202/AD204 –4– DIFFERENCES BETWEEN THE AD202 AND AD204 The primary distinction between the AD202 and AD204 is in the method by which they are powered: the AD202 operates directly from 15 V dc while the AD204 is powered by a non- isolated externally-supplied clock (AD246) that can drive up to 32 AD204s. The main advantages of using the externally- clocked AD204 over the AD202 are reduced cost in multichannel applications, lower power consumption, and higher bandwidth. In addition, the AD204 can supply substantially more isolated power than the AD202. Of course, in a great many situations, especially where only one or a few isolators are used, the convenience of standalone opera- tion provided by the AD202 will be more significant than any of the AD204’s advantages. There may also be cases where it is desirable to accommodate either device interchangeably, so the pinouts of the two products have been designed to make that easy to do. RECT AND FILTER OSCILLATOR DEMOD MOD SIGNAL POWER 5V FS +7.5V –7.5V 25kHz 25kHz AD202 FB IN– IN+ IN COM VSIG +VISO OUT –VISO OUT 5V FS HI LO 15V DC POWER RETURN VOUT Figure 1a. AD202 Functional Block Diagram RECT AND FILTER POWER CONV. DEMOD MOD SIGNAL POWER 5V FS +7.5V –7.5V 25kHz 25kHz AD204 FB IN– IN+ IN COM VSIG +VISO OUT –VISO OUT 5V FS HI LO CLOCK 15V p-p 25kHz POWER RETURN VOUT Figure 1b. AD204 Functional Block Diagram (Pin Designations Apply to the DIP-Style Package) INSIDE THE AD202 AND AD204 The AD202 and AD204 use an amplitude modulation technique to permit transformer coupling of signals down to dc (Figure 1a and 1b). Both models also contain an uncommitted input op amp and a power transformer that provides isolated power to the op amp, the modulator, and any external load. The power transformer primary is driven by a 25 kHz, 15 V p-p square wave generated internally in the case of the AD202, or supplied externally for the AD204. Within the signal swing limits of approximately ±5 V, the out- put voltage of the isolator is equal to the output voltage of the op amp; that is, the isolation barrier has unity gain. The output signal is not internally buffered, so the user is free to interchange the output leads to get signal inversion. Additionally, in multi- channel applications, the unbuffered outputs can be multiplexed with one buffer following the mux. This technique minimizes offset errors while reducing power consumption and cost. The output resistance of the isolator is typically 3 k Ω for the AD204 (7 k Ω for AD202) and varies with signal level and temperature, so it should not be loaded (see Figure 2 for the effects of load upon nonlinearity and gain drift). In many cases, a high imped- ance load will be present or a following circuit such as an output filter can serve as a buffer so that a separate buffer function will not often be needed. OUTPUT LOAD – M 0.25 0.20 0 0 1.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.15 0.10 0.05 –10 –8 –6 –4 –2 0 –500 –400 –300 –200 –100 0 GAIN CHANGE (%) GAIN TC CHANGE (ppm/ C) NON- LINEARITY (%) AD202 GAIN AND GAIN TC AD202 NONLINEARITY AD204 NONLINEARITY AD204 GAIN AND GAIN TC Figure 2. Effects of Output Loading USING THE AD202 AND AD204 Powering the AD202. The AD202 requires only a single 15 V power supply connected as shown in Figure 3a. A bypass capaci- tor is provided in the module. 15V 5% 15V RETURN AD202 Figure 3a. Powering the AD204. The AD204 gets its power from an externally supplied clock signal (a 15 V p-p square wave with a nominal frequency of 25 kHz) as shown in Figure 3b. 15V 15V RETURN AD204 AD204 AD204 AD246 + Figure 3b. (NOTE: Circuit figures shown on this page are for SIP-style packages. Refer to Page 3 for proper DIP package pinout.) |
Số phần tương tự - AD204_15 |
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Mô tả tương tự - AD204_15 |
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