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TS1005IG5T Datasheet(PDF) 10 Page - Silicon Laboratories |
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TS1005IG5T Datasheet(HTML) 10 Page - Silicon Laboratories |
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10 / 13 page  TS1005 Page 10 TS1005 Rev. 1.0 Configuring the TS1005 as Microwatt Analog Comparator Although optimized for use as an operational amplifier, the TS1005 can also be used as a rail-to- rail I/O comparator as illustrated in Figure 7. External hysteresis can be employed to minimize the risk of output oscillation. The positive feedback circuit causes the input threshold to change when the output voltage changes state. The diagram in Figure 8 illustrates the TS1005’s analog comparator hysteresis band and output transfer characteristic. The design of an analog comparator using the TS1005 is straightforward. In this application, a 3.0V power supply (VDD) was used and the resistor divider network formed by RD1 and RD2 generated a convenient reference voltage (VREF) for the circuit at ½ the supply voltage, or 1.5V, while keeping the current drawn by this resistor divider low. Capacitor C1 is used to filter any extraneous noise that could couple into the TS1005’s inverting input. In this application, the desired hysteresis band was set to 100mV (VHYB) with a desired high trip-point (VHI) set at 2.1V and a desired low trip-point (VLO) set at 2.0V. Since the TS1005 is a low supply current amplifier (1.3µA, typical), it is desired that the design of an analog comparator using the TS1005 should also use as little current as practical. The first step in the design, therefore, was to set the feedback resistor R3: R3 = 10M Ω Calculating a value for R1 is given by the following expression: R1 = R3 x (VHYB/VDD) Substituting VHYB=100mV, VDD=3.0V, and R3=10M Ω into the equation above yields: R1 = 333k Ω The following expression was then used to calculate a value for R2: R2 = 1/[VHI/(VREF x R1) – (1/R1) – (1/R3)] Substituting VHI = 2.1V, VREF = 1.5V, R1 = 333k Ω, and R3 = 10M Ω into the above expression yields: R2 = 909k Ω Printed Circuit Board Layout Considerations Even though the TS1005 operates from a single 0.8V to 5.5V power supply and consumes very little supply current, it is always good engineering practice to bypass the power supplies with a 0.1 μF ceramic capacitor placed in close proximity to the VDD and VSS (or GND) pins. Good pcb layout techniques and analog ground plane management improve the performance of any analog circuit by decreasing the amount of stray capacitance that could be introduced at the op amp's inputs and outputs. Excess stray capacitance can easily couple noise into the input leads of the op amp and excess stray capacitance at the output will add to any external capacitive load. Therefore, PC board trace lengths and external component leads should be kept a short as practical to any of the TS1005’s package pins. Second, it is also good engineering practice to route/remove any analog ground plane from the inputs and the output pins of the TS1005. Figure 8: Analog Comparator Hysteresis Band and Output Switching Points. Figure 7: A MicroWatt Analog Comparator with User- Programmable Hysteresis. |
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