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AD202 bảng dữ liệu(PDF) 9 Page - Analog Devices |
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AD202 bảng dữ liệu(HTML) 9 Page - Analog Devices |
9 / 12 page REV. D AD202/AD204 –9– CHANNEL 0 CHANNEL 1 HI LO HI LO RF RG RF RG 100pF 100pF 0.1” GRID 1 3 5 2 4 6 1 3 5 2 4 6 Figure 16b. Synchronization. Since AD204s operate from a common clock, synchronization is inherent. AD202s will normally not interact to produce beat frequencies even when mounted on 0.25-inch centers. Interaction may occur in rare situations where a large number of long, unshielded input cables are bundled together and channel gains are high. In such cases, shielded cable may be required or AD204s can be used. APPLICATIONS EXAMPLES Low Level Sensor Inputs. In applications where the output of low level sensors such as thermocouples must be isolated, a low drift input amplifier can be used with an AD204, as shown in Figure 17. A three-pole active filter is included in the design to get normal-mode rejection of frequencies above a few Hz and to provide enhanced common-mode rejection at 60 Hz. If offset adjustment is needed, it is best done at the trim pins of the OP07 itself; gain adjustment can be done at the feedback resistor. Note that the isolated supply current is large enough to mandate the use of 1 mF supply bypass capacitors. This circuit can be used with an AD202 if a low power op amp is used instead of the OP07. Process Current Input with Offset. Figure 18 shows an isolator receiver that translates a 4-20 mA process current signal into a 0 V to 10 V output. A 1 V to 5 V signal appears at the isolator’s output, and a –1 V reference applied to output LO provides the necessary level shift (in multichannel applications, the reference can be shared by all channels). This technique is often useful for getting offset with a follower-type output buffer. AD202 OR AD204 + +15V –15V 250 4–20mA 1V TO 5V – 15k + 0V TO 10V 10k – 237 1k AD589 6.8k –15V –1V TO ADDITIONAL CHANNELS Figure 18. Process Current Input Isolator with Offset The circuit as shown requires a source compliance of at least 5 V, but if necessary that can be reduced by using a lower value of current-sampling resistor and configuring the input amplifier for a small gain. (NOTE: Circuit figures shown on this page are for SIP-style packages. Refer to Page 3 for proper DIP package pinout.) AD204 +7.5V –7.5V CLK RET CLK – + VO = VI 1 + 50k RG 0.15 F 470k 470k 0.038 F 49.9k RG AD OP-07 1 F + 1 F + 1 F + 39k 220M HI LO OPTIONAL OPEN INPUT DETECTION ( ) Figure 17. Input Amplifier and Filter for Sensor Signals |
Số phần tương tự - AD202_15 |
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Mô tả tương tự - AD202_15 |
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