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TS1004 Datasheet(PDF) 8 Page - Silicon Laboratories |
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TS1004 Datasheet(HTML) 8 Page - Silicon Laboratories |
8 / 14 page TS1002/TS1004 Page 8 TS1002/4 Rev. 1.0 is 20.9% and air samples containing less than 18% oxygen are considered dangerous. In industrial applications, oxygen sensors are used to detect the absence of oxygen; for example, vacuum-packaging of food products is one example. The circuit in Figure 1 illustrates a typical implementation used to amplify the output of an oxygen detector. Either amplifier makes an excellent choice for this application as it only draws 0.6µA of supply current per amplifier and operates on supply voltages down to 0.65V. With the components shown in the figure, the circuit consumes less than 0.7 μA of supply current ensuring that small form-factor single- or button-cell batteries (exhibiting low mAh charge ratings) could last beyond the operating life of the oxygen sensor. The precision specifications of these amplifiers, such as their low offset voltage, low TCVOS, low input bias current, high CMRR, and high PSRR are other factors which make these amplifiers excellent choices for this application. Since oxygen sensors typically exhibit an operating life of one to two years, an oxygen sensor amplifier built around one of these amplifiers can operate from a conventionally- available single 1.5-V alkaline AA battery for over 290 years! At such low power consumption from a single cell, the oxygen sensor could be replaced over 150 times before the battery requires replacing! NanoWatt, Buffered Single-pole Low-Pass Filters When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often required. As shown in Figure 2, the simplest way to achieve this objective is to use an RC filter at the noninverting terminal of the amplifier. If additional attenuation is needed, a two-pole Sallen-Key filter can be used to provide the additional attenuation as shown in Figure 3. For best results, the filter’s cutoff frequency should be 8 to 10 times lower than the amplfier’s crossover frequency. Additional operational amplifier phase margin shift can be avoided if the amplifier bandwidth-to-signal bandwidth ratio is greater than 8. The design equations for the 2-pole Sallen-Key low- pass filter are given below with component values selected to set a 400Hz low-pass filter cutoff frequency: R1 = R2 = R = 1M Ω C1 = C2 = C = 400pF Q = Filter Peaking Factor = 1 f–3dB = 1/(2 x π x RC) = 400 Hz R3 = R4/(2-1/Q); with Q = 1, R3 = R4. A Single +1.5 V Supply, Two Op Amp Instrumentation Amplifier The amplifiers’ ultra-low supply current and ultra-low voltage operation make them ideal for battery- powered applications such as the instrumentation amplifier shown in Figure 4 using a TS1002. Figure 2: A Simple, Single-pole Active Low-Pass Filter. Figure 3: A Nanopower 2-Pole Sallen-Key Low-Pass Filter. Figure 1: A Nanopower, Precision Oxygen Gas Sensor Amplifier. |
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