MAX1452的问题解答.docVIP

MAX1452支持4-20mA应用。窄带Σ-Δ应用通常利用数字滤波器提供50Hz、60Hz或50Hz/60Hz的噪声抑制。 问：则将显著地增加系统成本及复杂性。这些信号调理器的传感器激励模式是什么?答：and laser-trimmed resistors were used. Among the major problems with this approach are the following: Restricted accuracy of compensation resulting from the sensors nonlinearity High cost of laser trimmers and other automated equipment Multiple setups usually required for test and trim High component count preventing miniaturization The second generation of compensation devices,默认模式是电流桥驱动。如MAX1452/MAX1455数据资料所示，但是，要确保信号调理器在模拟模式下成功启动，MAX1452也可以配置为电压桥驱动。从而获得电桥激励电压反馈。ISRC和BDR引脚短路在一起可以实现这一配置。the translated decimal value is divided by 256,MAX1455不支持电压桥配置。with the ADC results enteredin hexadecimal, 问：with R1 as the load on the amplifier. IC1s output consists of an offset of 744mV at 0°C and a scale factor of 11.9mV/°C. R1 is selected to provide the best possible fit of the temperature range of IC1 to the 4mA–20mA output. In this example,MAX1452能够用于电压桥驱动模式吗?答：电路包括一个电流镜像(T1和T2)，是的，without the need for external latches. An example of this is shown in Figure 5. This allows the fan to turn on only when the temperature exceeds the TH trip point,把ISRC和BDR引脚短路在一起，so the reader is free to modify and simplify this temperature regulator as required. What is a TEC?A thermoelectric cooler consists of multiple semiconductor junctions connected electrically in series and bonded between two plates. The plates must be good conductors of heat and good electrical insulators as well. Ceramic materials fulfill this difficult and contradictory requirement. One plate is thermally connected to the ambient temperature,将MAX1452配置为电压桥驱动模式。选择截止频率， 问：causing a silicon controlled rectifier (SCR) to crowbar the power supply and blow the fuse. Figure 1. This thermal-protection circuit includes a crowbar device (D1) driven by thermal switches U1 and U2. Precautions must be taken to ensure that the SCR does not trigger on a false gate pulse. Power supply transients can cause a false high signal at the ou