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ISO254 Datasheet(PDF) 6 Page - Burr-Brown (TI) |
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ISO254 Datasheet(HTML) 6 Page - Burr-Brown (TI) |
6 / 9 page 6 ® ISO254 INPUT COMMON-MODE RANGE The linear common-mode range of the input circuitry of the ISO254 is approximately ±12.7V (or 2.3V from the power supplies). As the output voltage increases, however, the linear input range will be limited by the output voltage swing of the internal amplifiers. Thus, the linear common-mode range is related to the output voltage of the complete input amplifier—see performance curves “Input Common-Mode Range vs Output Voltage.” A combination of common-mode and differential input voltage can cause the output voltage of the internal amplifi- ers to saturate. For applications where input common-mode range must be maximized, limit the output voltage swing by selecting a lower gain of the programmable-gain input. Input-overload can produce an output voltage that appears normal. For example, an input voltage of +20V on one input and +40V on the other input will exceed the linear common- mode range of both input amplifiers. Since both input amplifiers are saturated to nearly the same output voltage limit, the difference voltage measured by the output ampli- fier will be near zero. The output of the programmable-gain amplifier will be near 0V even though both inputs are overloaded. BASIC OPERATION ISO254 is a precision, powered, three-port isolated program- mable-gain amplifier. The input and output sections are galvanically isolated by matched and EMI shielded capaci- tors built into the plastic package. The DC/DC converter input is also galvanically isolated from both the input and output supplies. SIGNAL AND POWER CONNECTIONS Figure 1 shows proper power and signal connections. The power supply input pin +VS3 should be bypassed with a 2.2 µF tantalum capacitor and the outputs V S1 and VS2 with 220nF ceramic capacitors located as close to the amplifier as possible. All ground connections should be run indepen- dently to a common point. Signal Common on the output section provides a low-impedance point for sensing signal ground in noisy applications. Com1 and Com2 must have a path to ground for signal current return and should be maintained within ±1V of GND1 and GND2 respectively. FIGURE 1. Basic Connections. 220nF 220nF 1 10 100 1000 0 0 1 1 0 1 0 1 GAIN A1 A0 2.2µF +V S1 Com1 –V IN +V IN –V S1 GND1 28 26 3 4 27 25 +V S2 Com2 –V S2 GND2 12 V OUT 13 11 10 V OUT 14 +15V OUT –15V OUT 220nF 220nF +15V OUT –15V OUT ISO254 PGA A0 A1 1 SYNC GND3 +V S3 16 17 15 2 SYNC +15V V IN V CM |
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