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TS1005IJ5TP Datasheet(PDF) 8 Page - Touchstone Semiconductor Inc |
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TS1005IJ5TP Datasheet(HTML) 8 Page - Touchstone Semiconductor Inc |
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8 / 11 page  TS1005 Page 8 TS1005DS r1p0 RTFDS 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. The TS1005 makes an excellent choice for this application as it only draws 1.3µA of supply current and operates on supply voltages down to 0.8V. With the components shown in the figure, the circuit consumes less than 1.4μA 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 the TS1005, such as its low offset voltage, low TCVOS, low input bias current, high CMRR, and high PSRR are other factors which make the TS1005 an excellent choice for this application. Since oxygen sensors typically exhibit an operating life of one to two years, an oxygen sensor amplifier built around a TS1005 can operate from a conventionally-available single 1.5-V alkaline AA battery for over 145 years! At such low power consumption from a single cell, the oxygen sensor could be replaced over 75 times before the battery requires replacing! MicroWatt, 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 TS1005. 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 TS1005’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 2kHz low-pass filter cutoff frequency: R1 = R2 = R = 1MΩ C1 = C2 = C = 80pF Q = Filter Peaking Factor = 1 f–3dB = 1/(2 x π x RC) = 2kHz R3 = R4/(2-1/Q); with Q = 1, R3 = R4. A Single +1.5 V Supply, Two Op Amp Instrumentation Amplifier The TS1005’s ultra-low supply current and ultra-low voltage operation make it ideal for battery-powered applications such as the instrumentation amplifier shown in Figure 4. The circuit utilizes the classic two op amp instrumentation amplifier topology with four resistors to set the gain. The equation is simply that of a noninverting amplifier as shown in the figure. Figure 2: A Simple, Single-pole Active Low-Pass Filter. Figure 3: A Micropower 2-Pole Sallen-Key Low-Pass Filter. Figure 4: A Two Op Amp Instrumentation Amplifier. Figure 1: A Micropower, Precision Oxygen Gas Sensor Amplifier. |
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