Ваш город: Москва
+7 (495) 221-78-04
+7 (812) 327-327-1
Терраэлектроника
Применения > > Oversampled SAR ADC with PGA Achieving Greater Than 125 dB Dynamic Range

Oversampled SAR ADC with PGA Achieving Greater Than 125 dB Dynamic Range (CN0260)

This circuit, shown in Figure 1, is a flexible sensor signal conditioning block, with low noise, relatively high gain, and the ability to dynamically change the gain in response to input level changes without affecting performance, while still maintaining a wide dynamic range. Existing sigma-delta technology can provide the dynamic range needed for many applications, but only at the expense of low update rates. This circuit presents an alternative approach that uses the AD7985 16-bit, 2.5 MSPS PulSAR® successive-approximation ADC, combined with an autoranging AD8253 iCMOS® programmable gain instrumentation amplifier (PGA) front end. With gain that changes automatically based on analog input value, it uses oversampling and digital processing to increase the dynamic range of the system to more than 125 dB.


Figure 1. Wide Dynamic Range Signal Conditioning Circuit with Autoranging PGA and Oversampling SAR ADC (Note: All Connections and Decoupling Not Shown)


Figure 2. Increasing Oversampling Ratio (OSR) Reduces Noise

Возможности

  • Oversampled 16-Bit PulSAR ADC with PGA
  • Greater than 125 dB Dynamic Range
  • No Pipeline Delay

Файлы

Используемые компоненты


Заметили ошибку в работе сайта?
Скажите нам об этом