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PGA207PA Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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PGA207PA Datasheet(HTML) 9 Page - Burr-Brown (TI) |
9 / 10 page 9 ® PGA206/207 FIGURE 4. Multiplexed-Input Signal Acquisition System. INPUT COMMON-MODE RANGE The linear input voltage range of the PGA206 and PGA207 is from approximately 2.3V below the positive supply volt- age to 1.5V above the negative supply. As a differential input voltage causes output voltage to increase, however, the linear input range is limited by the output voltage swing of amplifiers A1 and A2. So the linear common-mode input range is related to the output voltage of the complete amplifier. This behavior also depends on supply voltage— see performance curves “Input Common-Mode Range vs Output Voltage”. Input overload can produce an output voltage that appears normal. For example, if an input overload condition drives both input amplifiers to their positive output swing limit, the difference voltage measured by the output amplifier will be near zero. The output of the PGA206 or PGA207 will be near 0V even though both inputs are overloaded. This condition can be detected by sensing the voltage on the V01 and V02 pins to determine whether they are within their linear operating range. INPUT PROTECTION The inputs of the PGA206 and PGA207 are individually protected for voltages up to ±40V. For example, a condition of -40V on one input and +40V on the other input will not cause damage. Internal circuitry on each input provides low series impedance under normal signal conditions. If the input is overloaded, the protection circuitry limits the input current to a safe value. The typical performance curve “Input Over- load V/I Characteristic” shows this behavior. The inputs are protected even if no power supply voltage is applied. MULTIPLEXED INPUTS The PGA206 and PGA207 are ideally suited for multiple channel data acquisition. Figure 4 shows a typical applica- tion with an analog multiplexer used to connect one of four differential input signals to a single PGA207. Careful circuit layout will help preserve accuracy of multi- plexed signals. Run the inverting and non-inverting connec- tions of each channel parallel to each other over a ground plane, or directly adjacent on top and bottom of the circuit board. Grounded guard traces between channels help reduce stray signal pick-up. Multiplexed signals from high impedance sources require special care. As inputs are switched by the multiplexer, charge can be injected into the source, disturbing the input signal. Since many such sources involve slow signals, a simple R/C filter at the input can be used to dramatically reduce this effect. The arrangement shown filters both the differential signal and common-mode noise. PGA207 10 11 12 13 7 6 5 4 8 9 74HC574 3 15 116 To Address Logic Data Bus –15V +15V 14 2 A/D Converter ADS7807 CK 1k Ω Input Filter See Text 1k Ω Channel 1 1nF Channel 4 Software-Zero 10nF 1nF V IN V IN – + HI-509 |
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