A Low Power, Precision SAR Analog to Digital Converter for High Temperature Applications

A growing number of industries are calling for low power electronics that operate reliably at temperatures of 175°C and higher. Many of these applications require a precision data acquisition signal chain in order to digitize analog data so that it can be collected and processed. Designing circuits that meet these needs can be very challenging, requiring a data converter that can deliver high performance and reliability in these harsh environments. There are currently a very limited number of integrated circuits commercially available that are specified for operation at these temperatures, and no low power precision data converters with sample rates greater than 100kSPS. This paper presents a new 210°C rated precision analog to digital converter capable of sample rates up to 600 kSPS with 16 bit resolution while maintaining low power consumption and packaged in a small form factor. We will explore the converter architecture of this ADC, present initial test results, and show how high reliability is achieved through qualification and advanced packaging techniques.

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A Survey on Analog-to-Digital Converter Integrated Circuits for Miniaturized High Resolution Ultrasonic Imaging System

Micromachines ◽

10.3390/mi13010114 ◽

2022 ◽

Vol 13 (1) ◽

pp. 114

Author(s):

Dongdong Chen ◽

Xinhui Cui ◽

Qidong Zhang ◽

Di Li ◽

Wenyang Cheng ◽

...

Keyword(s):

High Resolution ◽

Integrated Circuits ◽

High Performance ◽

Imaging System ◽

Ultrasonic Imaging ◽

Pipelined Adc ◽

Analog To Digital Converter ◽

Digital Converter ◽

Analog To Digital ◽

Different Types

As traditional ultrasonic imaging systems (UIS) are expensive, bulky, and power-consuming, miniaturized and portable UIS have been developed and widely utilized in the biomedical field. The performance of integrated circuits (ICs) in portable UIS obviously affects the effectiveness and quality of ultrasonic imaging. In the ICs for UIS, the analog-to-digital converter (ADC) is used to complete the conversion of the analog echo signal received by the analog front end into digital for further processing by a digital signal processing (DSP) or microcontroller unit (MCU). The accuracy and speed of the ADC determine the precision and efficiency of UIS. Therefore, it is necessary to systematically review and summarize the characteristics of different types of ADCs for UIS, which can provide valuable guidance to design and fabricate high-performance ADC for miniaturized high resolution UIS. In this paper, the architecture and performance of ADC for UIS, including successive approximation register (SAR) ADC, sigma-delta (Σ-∆) ADC, pipelined ADC, and hybrid ADC, have been systematically introduced. In addition, comparisons and discussions of different types of ADCs are presented. Finally, this paper is summarized, and presents the challenges and prospects of ADC ICs for miniaturized high resolution UIS.

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High Precision Analog Multiplexers Enable Multi-Channel Data Acquisition in High Temperature Environments

Additional Conferences (Device Packaging HiTEC HiTEN & CICMT) ◽

10.4071/2016-hitec-35 ◽

2016 ◽

Vol 2016 (HiTEC) ◽

pp. 000035-000039

Author(s):

Jeff Watson ◽

Stephen Kavanagh ◽

Stephen Nugent

Keyword(s):

Integrated Circuits ◽

Low Power ◽

Data Acquisition ◽

High Performance ◽

Single Channel ◽

Low Voltage ◽

Precision Data ◽

Analog To Digital ◽

Low Leakage ◽

Analog To Digital Conversion

Abstract A growing number of industries are calling for low power electronics that operate reliably at temperatures of 175C and higher. Many of these applications require a precision data acquisition signal chain in order to digitize analog data so that it can be collected and processed. We previously presented a characterized signal chain for a single channel of analog to digital conversion designed around a 600ks ps SAR ADC. However, many systems have a multitude of sensor signals that must be acquired at varying sample rates. In this work we discuss two new analog multiplexers rated for 175°C/210°C that allow multiple analog signals to be connected to the ADC input, enabling the design of a precision multi-channel data acquisition system. One multiplexer is designed on a robust dielectrically isolated process for high performance and low leakage over temperature, and one multiplexer is optimized for low power, low voltage applications. We will examine the architecture of these two integrated circuits, review the characterization over temperature and discuss example application signal chains.

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