Archive for February, 2010
Low Cost 4-20mA Current Loop Signal Conditioning Circuit MAX1452
By Rust at 21 February, 2010, 5:17 am
The benefits of 4-20mA current loop format in process control systems are 2-wire sensor operation, long cable runs, and noise immunity. The voltages for the loop can be ranging from 12VDC to 40VDC and are inherently nonratiometric to the output signal. The MAX1452 low current consumption allows the system to operate from loop power with [...]
Read More >>Delta-Sigma Converter and Its Latency
By Rend at 21 February, 2010, 4:06 am
This application note describe about ADC cycle latency, ADC latency time, and the delta-sigma analog-to-digital converter (ADC). The theory about ADC cycle latency, ADC latency time, and the delta-sigma analog-to-digital converter (ADC) are presented in detail after introduction. The main topic is divided into 2 sections : ADC cycle latency and ADC latency time. The [...]
Read More >>Resitive touch Screen for Human/Machine Interface
By Rend at 18 February, 2010, 11:47 pm
Many appliances such as information personal digital assistants (PDAs) and instrumentation and control applications are use touch-screen interfaces. This is a application notes of using resistive touch screens for human/machine interface. This application notes describes about how to convert the analog inputs into usable digital data, the basics of how resistive touch screens work, resistive [...]
Read More >>Digital Transmission for Thermocouple Improves Noise Immunity
By Rend at 18 February, 2010, 10:54 pm
The signal-processing block of thermocouple is sensitive to EMI, just like other low-level circuitry. It’s wires are often exposed to EMI. It will increase undermines the accuracy of the acquired temperature data and uncertainty in the received signal. To solve this problem, usually we use special thermocouple cable but it will expensive and if we [...]
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