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OP113ES Fiches technique(PDF) 5 Page - Analog Devices |
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OP113ES Fiches technique(HTML) 5 Page - Analog Devices |
5 / 16 page OP113/OP213/OP413 REV. C –5– 2 mV trim range may be somewhat excessive. Reducing the trimming potentiometer to a 2 k Ω value will give a more reason- able range of ±400 µV. 16 2 13 6 7 11 12 4 14 15 9 1 3 AD588BD 8 10 3 2 8 1 R5 1k A2 2N2219A +10.000V +15V –15V 10 F 1/2 OP213 +10.000V 6 5 4 7 1/2 OP213 A1 R3 17.2k 0.1% R4 500 CMRR TRIM 10-TURN T.C. LESS THAN 50ppm/ C OUTPUT 0 10V F.S. –15V 350 LOAD CELL 100mV F.S. R1 17.2k 0.1% R2 301 0.1% Figure 1. Precision Load Cell Scale Amplifier APPLICATION CIRCUITS A High Precision Industrial Load-Cell Scale Amplifier The OP113 family makes an excellent amplifier for conditioning a load-cell bridge. Its low noise greatly improves the signal reso- lution, allowing the load cell to operate with a smaller output range, thus reducing its nonlinearity. Figure 1 shows one half of the OP113 family used to generate a very stable 10.000 V bridge excitation voltage while the second amplifier provides a differen- tial gain. R4 should be trimmed for maximum common-mode rejection. A Low Voltage Single Supply, Strain-Gage Amplifier The true zero swing capability of the OP113 family allows the amplifier in Figure 2 to amplify the strain-gage bridge accurately even with no signal input while being powered by a single +5 volt supply. A stable 4.000 V bridge voltage is made possible by the rail-to-rail OP295 amplifier, whose output can swing to within a millivolt of either rail. This high voltage swing greatly increases the bridge output signal without a corresponding in- crease in bridge input. 3 2 8 1 2N2222A 2.500V 1/2 OP295 4 2 4 6 IN OUT GND REF43 R8 12.0k R7 20.0k 4.000V 350 35mV F.S. +5V 1/2 OP213 1 3 2 8 6 5 4 7 R4 100k R3 20k R6 27.4 R5 2.10k R2 20k R1 100k 1/2 OP295 RG = 2,127.4 +5V OUTPUT 0V 3.5V Figure 2. Single Supply Strain-Gage Amplifier APPLICATIONS The OP113, OP213 and OP413 form a new family of high performance amplifiers that feature precision performance in standard dual supply configurations and, more importantly, maintain precision performance when a single power supply is used. In addition to accurate dc specifications, it is the lowest noise single supply amplifier available with only 4.7 nV/ √Hz typical noise density. Single supply applications have special requirements due to the generally reduced dynamic range of the output signal. Single supply applications are often operated at voltages of +5 volts or +12 volts, compared to dual supply applications with supplies of ±12 volts or ±15 volts. This results in reduced output swings. Where a dual supply application may often have 20 volts of signal output swing, single supply applications are limited to, at most, the supply range and, more commonly, several volts be- low the supply. In order to attain the greatest swing the single supply output stage must swing closer to the supply rails than in dual supply applications. The OP113 family has a new patented output stage that allows the output to swing closer to ground, or the negative supply, than previous bipolar output stages. Previous op amps had outputs that could swing to within about ten millivolts of the negative supply in single supply applications. However, the OP113 family combines both a bipolar and a CMOS device in the output stage, enabling it to swing to within a few hundred microvolts of ground. When operating with reduced supply voltages, the input range is also reduced. This reduction in signal range results in reduced signal-to-noise ratio, for any given amplifier. There are only two ways to improve this: increase the signal range or reduce the noise. The OP113 family addresses both of these parameters. Input signal range is from the negative supply to within one volt of the positive supply over the full supply range. Com- petitive parts have input ranges that are a half a volt to five volts less than this. Noise has also been optimized in the OP113 family. At 4.7 nV/ √Hz, it is less than one fourth that of competi- tive devices. Phase Reversal The OP113 family is protected against phase reversal as long as both of the inputs are within the supply ranges. However, if there is a possibility of either input going below the negative supply (or ground in the single supply case), the inputs should be pro- tected with a series resistor to limit input current to 2 mA. OP113 Offset Adjust The OP113 has the facility for external offset adjustment, using the industry standard arrangement. Pins 1 and 5 are used in conjunction with a potentiometer of 10 k Ω total resistance, connected with the wiper to V– (or ground in single supply applications). The total adjustment range is about ±2 mV using this configuration. Adjusting the offset to zero has minimal effect on offset drift (assuming the potentiometer has a tempco of less than 1000 ppm/ °C). Adjustment away from zero, however, (like all bipolar amplifiers) will result in a TCVOS of approximately 3.3 µV/°C for every millivolt of induced offset. It is therefore not generally recommended that this trim be used to compensate for system errors originating outside of the OP113. The initial offset of the OP113 is low enough that external trimming is almost never required but, if necessary, the |
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