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MAX4237BESA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4237BESA Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 14 page SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps ______________________________________________________________________________________ 11 Detailed Description The MAX4236/MAX4237 are high-precision op amps with a CMOS input stage and an excellent set of DC and AC features. The combination of tight maximum voltage offset, low offset tempco and very low input current make them ideal for use in high-precision DC circuits. They feature low-voltage operation, low-power consumption, high-current drive with rail-to-rail output swing and high-gain bandwidth product. High Accuracy The MAX4236/MAX4237 maximum input offset voltage is 20µV (5µV, typ) for grade A version and 50µV for grade B version at +25°C. The maximum temperature coefficient of the offset voltage for grade A and B are guaranteed to be 2µV/°C and 4.5µV/°C respectively. The parts have an input bias current of 1pA. Noise characteristics are 14nV/ √Hz, and a low frequency noise (0.1Hz to 10Hz) of 0.2µVp-p. The CMRR is 102dB, and the PSRR is 120dB. The combination is what is necessary for the design of circuits to process signals while keeping high signal-to-noise ratios, as in stages preceding high-resolution converters, or when they are produced by sensors or transducers generat- ing very small outputs. Rail-to-Rail Outputs, Ground-Sensing Input The input common-mode range extends from (VEE - 0.15V) to (VCC - 1.2V) with excellent common-mode rejection. Beyond this range, the amplifier output is a nonlinear function of the input, but does not undergo phase reversal or latch-up (see Typical Operating Characteristics). The output swings to within 150mV of the power-supply rails with a 1k Ω load. The input ground sensing and the rail-to-rail output substantially increase the dynamic range. Power-Up and Shutdown Mode The MAX4236/MAX4237 have a shutdown option. When the shutdown pin (SHDN) is pulled low, the sup- ply current drops to 0.1µA, and the amplifiers are dis- abled with the output in a high-impedance state. Pulling SHDN high enables the amplifiers. The turn-on time for the amplifiers to come out of shutdown is 4µs. Applications Information As described above, the characteristics of the MAX4236/MAX4237 are excellent for high-precision/ accuracy circuitry, and the high impedance, low-cur- rent, low-offset, and noise specifications are very attractive for piezoelectric transducers applications. In these applications, the sensors generate an amount of electric charge proportional to the changes in the mechanical stress applied to them. These charges are transformed into a voltage proportional to the applied force by injecting them into a capacitance and then amplifying the resulting voltage. The voltage is an inverse function of the capacitance into which the charges generated by the transducer/ sensor are injected. This capacitance and the resistance that dis- charges it, define the low-frequency response of the circuit. It is desirable, once the preferred low-frequency response is known, to maintain the capacitance as low as possible, because the amount of necessary upstream amplification (and the signal-to-noise ratio deterioration) is directly proportional to the capacitance value. The MAX4236/MAX4237 high-impedance, low- Pin Description PIN SOT23 SO/µMAX NAME FUNCTION 1 6 OUT Amplifier Output 24 VEE Negative Power Supply. Bypass with a 0.1 µF capacitor to ground. Connect to GND for single-supply operation. 3 3 IN+ Noninverting Amplifier Input 4 2 IN- Inverting Amplifier Input 58 SHDN Shutdown Input. Do not leave floating. Connect to VCC for normal operation or GND to enter the shutdown mode. 67 VCC Positive Supply Input. Bypass with a 0.1 µF capacitor to ground. — 1, 5 N.C. No Connection. Not internally connected. |
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