Many system designers use Σ-Δ ADCs and RTDs (Resistive Temperature Detectors) for temperature measurements, but have difficulty implementing the high performance specified in the ADC data sheet. For example, some designers may only get 12 to 13 noise-free bits from a 16-bit to 18-bit ADC. The front-end technology described in this article enables designers to get more than 16 noise-free bits in their system design.
The use of RTD in ratiometric measurements has certain advantages because it eliminates sources of error such as accuracy and drift of the excitation current source. Below is a typical circuit for 4-wire RTD ratiometric measurements. The advantage of the 4-wire configuration is that it eliminates the error caused by the pin resistance.
Figure 1. 4-wire RTD ratiometric measurement circuit.
We can derive the following two formulas from the above circuit:
When the ADC is operating in bipolar differential mode, the general expression for calculating the RTD resistance (RRTD) is as follows:
The advantage of entertainment tablet lies in having a powerful chip and excellent hardware. If you want to play various online videos on the tablet and run various software smoothly, the performance of the hardware is an absolute prerequisite. In addition, a high-speed and stable WIFI module is also required, which must be compatible with multiple 802.11 B/G/N protocols at the same time, so that the webpage can be loaded instantly when the webpage is opened, and the online video can be played smoothly. So hardware is the premise and foundation, without good performance everything else is empty talk.
In addition to having a good CPU as a prerequisite, it is equally important to carry a professional video player. A professional video player must perform equally well both online and offline.
Entertainment Tablet,High capacity battery Tablet,WIFI Tablet
Jingjiang Gisen Technology Co.,Ltd , https://www.jsgisentec.com