16-Bit, 600 kSPS, Low Power Data Acquisition System for High Temperature Environments (CN0365)

A growing number of applications require data acquisition systems that must operate reliably at very high ambient temperature environments, such as downhole oil and gas drilling, avionics, and automotive. The circuit shown in Figure 1 is a 16-bit, 600 kSPS successive approximation analog-to-digital converter (ADC) system using devices rated, characterized, and guaranteed at 175°C. Because many of these harsh environment applications are battery-powered, the signal chain has been designed for low power consumption while still maintaining high performance.


Figure 1. High Temperature Data Acquisition System (Simplified Schematic: All Connections and Decoupling Not Shown)

This circuit uses the AD7981, a low power (4.65 mW at 600 kSPS), high temperature PulSAR® ADC, driven directly from the AD8634 high temperature, low power op amp. The AD7981 ADC requires an external voltage reference between 2.4 V and 5.1 V, and in this application, the voltage reference chosen is the micropower ADR225 precision 2.5 V reference, which is also qualified for high temperature operation and has a very low quiescent current of 60 μA maximum at 210°C.

All of the ICs in this design have packaging specially designed for high temperature environments, including monometallic wire bonds. In addition, this reference design describes the selection of the passive components, printed circuit board PCB) materials, and construction techniques to enable operation at these extreme temperatures. A complete design support package including bill of materials, schematic, assembly, and layout files is also available.

Возможности

  • 16-Bit, 600kSPS Data Acquisition System
  • System guaranteed at +175°C
  • Low Power

Файлы

Схемы и диаграммы

Быстро получите общее представление о схемотехнике решения

16-Bit, 600 kSPS, Low Power Data Acquisition System for High Temperature Environments  CN0365

Используемые компоненты

Производитель: Analog Devices Inc.
Наименование
Производитель
Описание Корпус/
Изображение
Цена, руб. Наличие
ADR225HFZ
ADR225HFZ
Analog Devices Inc.
Арт.: 1922099 PDF RD
Доступно: 30 шт.
Выбрать
условия
поставки
VOLTAGE REF, SERIES, 2.5V, FLATPACK-8
ADR225HFZ
30 шт.
(под заказ)
Выбрать
условия
поставки
AD8634HRZN
AD8634HRZN
Analog Devices Inc.
Арт.: 2084966 PDF RD
Доступно: 724 шт. от: 4830 руб.
OP AMP, 9.7MHZ, 5V/US, 250UV, SOIC-8
AD8634HRZN 4830,00
5 шт.
(на складе)
719 шт.
(под заказ)
AD7981HFZ
Analog Devices Inc.
Арт.: 2388906 PDF RD
Доступно: 29 шт.
Выбрать
условия
поставки
Analog to Digital Converters - ADC 16-bit 600ksps 210C SAR ADC
AD7981HFZ
29 шт.
(под заказ)
Выбрать
условия
поставки