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LM9040 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM9040 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 10 page Open Input Pins Defaults (Continued) In the cases where both the inverting and non-inverting pins are open the non-inverting condition (ie voltage divider across the output) will be the dominant condition Any common mode signal seen by inverting input pin should not be allowed to exceed the Common Mode voltage range Exceeding the positive Common Mode voltage limit could cause the inverting input pin voltage comparator to act as if the inverting input pin is open Since the comparator circuit is not part of the switched capacitor network there is no frequency limitation on the signal to the comparator Any transient on the inverting input pin which goes above the comparator threshold will immediately cause the output to switch to the open sensor mode The output will return to normal operation when the voltage on the inverting input falls below the comparator threshold Supply Bypassing For best performance the LM9040 requires a VCC supply which is stable and noise free The same 5V VREF supply used for the AD converter is the recommended VCC sup- ply During operation the device will generate current spikes coincident with the clock edges Inadequate bypassing will cause excessive clock noise on the outputs as well as noise on the VCC line The LM9040 VCC pin should be by- passed with a minimum 01 mF capacitor to the Signal Ground pin and should be located as close to the device as possible Some applications may require an additional 47 mF tantalum capacitor especially if there are several other switched capacitor devices running off the same 5V supply line The Signal and Digital Ground pins should be tied together as close to the device as possible TLH12372 – 21 FIGURE 11 Typical Application 8 |
Similar Part No. - LM9040 |
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Similar Description - LM9040 |
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