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LTC2431CMS 数据表(PDF) 32 Page - Linear Technology |
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LTC2431CMS 数据表(HTML) 32 Page - Linear Technology |
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32 / 40 page  LTC2430/LTC2431 32 24301f APPLICATIO S I FOR ATIO INPUT FREQUENCY (Hz) 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 2431 F36 0 –20 –40 –60 –80 –100 –120 VCC = 5V VREF = 5V VINCM = 2.5V FO = GND TA = 25°C VIN(P-P) = 5V VIN(P-P) = 7.5V (150% OF FULL SCALE) INPUT FREQUENCY (Hz) 0 2431 F37 0 –20 –40 –60 –80 –100 –120 VCC = 5V VREF = 5V VINCM = 2.5V FO = 5V TA = 25°C VIN(P-P) = 5V VIN(P-P) = 7.5V (150% OF FULL SCALE) 25 50 75 100 125 150 175 200 Figure 36. Measured Input Normal Mode Rejection vs Input Frequency Figure 37. Measured Input Normal Mode Rejection vs Input Frequency BRIDGE APPLICATIONS Typical strain gauge based bridges deliver only 2mV/Volt of excitation. As the maximum reference voltage of the LTC2430/LTC2431 is 5V, remote sensing of applied exci- tation without additional circuitry requires that excitation be limited to 5V. This gives only 10mV full scale, which can be resolved to 1 part in 3500 without averaging. For many solid state sensors, this is comparable to the sensor. Av- eraging 128 samples however reduces the noise level by a factor of eight, bringing the resolving power to 1 part in 40000, comparable to better weighing systems. Hysteresis and creep effects in the load cells are typically much greater than this. Most applications that require strain measure- ments to this level of accuracy are measuring slowly chang- ing phenomena, hence the time required to average a large number of readings is usually not an issue. For those sys- tems that require accurate measurement of a small incre- mental change on a significant tare weight, the lack of history effects in the LTC2400 family is of great benefit. For those applications that cannot be fulfilled by the LTC2430/LTC2431 alone, compensating for error in exter- nal amplification can be done effectively due to the “no latency” feature of the LTC2430/LTC2431. No latency operation allows samples of the amplifier offset and gain to be interleaved with weighing measurements. The use of correlated double sampling allows suppression of 1/f noise, offset and thermocouple effects within the bridge. Correlated double sampling involves alternating the polarity of excitation and dealing with the reversal of input polarity mathematically. Alternatively, bridge excita- tion can be increased to as much as ±10V, if one of several precision attenuation techniques is used to produce a precision divide operation on the reference signal. An- other option is the use of a reference within the 5V input range of the LTC2430/LTC2431 and developing excitation via fixed gain, or LTC1043 based voltage multiplication, along with remote feedback in the excitation amplifiers, as shown in Figures 43 and 45. Figure 38 shows an example of a simple bridge connec- tion. Note that it is suitable for any bridge application REF+ REF– SDO SCK IN+ IN– CS GND VCC FO R1 0.1 µF10µF 0.1 µF 350 Ω BRIDGE 2431 F38 + R2 R1 AND R2 CAN BE USED TO INCREASE TOLERABLE AC COMPONENT ON REF SIGNALS LT1019 LTC2430/ LTC2431 Figure 38. Simple Bridge Connection |
类似零件编号 - LTC2431CMS |
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类似说明 - LTC2431CMS |
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