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TS1002IM8 Datenblatt(PDF) 7 Page - Silicon Laboratories |
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TS1002IM8 Datenblatt(HTML) 7 Page - Silicon Laboratories |
7 / 14 page TS1002/TS1004 TS1002/4 Rev. 1.0 Page 7 PIN FUNCTIONS Pin Label Function TS1002 MSOP TS1004 TSSOP 1, 7 1, 7, 8, 14 OUT Amplifier Outputs: A, B – TS1002; A, B, C, D – TS1004 4 7 VSS Negative Supply or Analog GND. If applying a negative voltage to this pin, connect a 0.1µF capacitor from this pin to analog GND. 3, 5 3, 5, 10, 12 +IN Amplifier Non-inverting Inputs: A, B – TS1002; A, B, C, D – TS1004 2, 6 2, 6, 9, 13 -IN Amplifier Inverting Inputs: A, B – TS1002; A, B, C, D – TS1004 8 14 VDD Positive Supply Connection. Connect a 0.1µF bypass capacitor from this pin to analog GND. THEORY OF OPERATION The TS1002 and the TS1004 are fully functional for input signals from the negative supply (VSS or GND) to the positive supply (VDD). Their input stages consist of two differential amplifiers, a p-channel CMOS stage and an n-channel CMOS stage that are active over different ranges of the input common mode voltage. The p-channel input pair is active for input common mode voltages, VINCM, between the negative supply to approximately 0.4V below the positive supply. As the common-mode input voltage moves closer towards VDD, an internal current mirror activates the n-channel input pair differential pair. The p-channel input pair becomes inactive for the balance of the input common mode voltage range up to the positive supply. Because both input stages have their own offset voltage (VOS) characteristic, the offset voltage of these amplifiers is a function of the applied input common-mode voltage, VINCM. The VOS has a crossover point at ~0.4V from VDD (Refer to the VOS vs. VCM curve in the Typical Operating Characteristics section). Caution should be taken in applications where the input signal amplitude is comparable to the amplifiers’ VOS value and/or the design requires high accuracy. In these situations, it is necessary for the input signal to avoid the crossover point. In addition, amplifier parameters such as PSRR and CMRR which involve the input offset voltage will also be affected by changes in the input common-mode voltage across the differential pair transition region. The amplifiers’ second stage is a folded-cascode transistor arrangement that converts the input stage differential signals into a single-ended output. A complementary drive generator supplies current to the output transistors that swing rail to rail. The amplifiers’ output stage voltage swings within 1.2mV from the rails at 0.8V supply when driving an output load of 100k Ω - which provides the maximum possible dynamic range at the output. This is particularly important when operating on low supply voltages. When driving a stiffer 10k Ω load, the amplifiers’ output swings within 10mV of VDD and within 5mV of VSS (or GND). APPLICATIONS INFORMATION Portable Gas Detection Sensor Amplifier Gas sensors are used in many different industrial and medical applications. Gas sensors generate a current that is proportional to the percentage of a particular gas concentration sensed in an air sample. This output current flows through a load resistor and the resultant voltage drop is amplified. Depending on the sensed gas and sensitivity of the sensor, the output current can be in the range of tens of microamperes to a few milliamperes. Gas sensor datasheets often specify a recommended load resistor value or a range of load resistors from which to choose. There are two main applications for oxygen sensors – applications which sense oxygen when it is abundantly present (that is, in air or near an oxygen tank) and those which detect traces of oxygen in parts-per-million concentration. In medical applications, oxygen sensors are used when air quality or oxygen delivered to a patient needs to be monitored. In fresh air, the concentration of oxygen |
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