LINEAR Data Acquisition Circuit Collection Application Note 62
Summary
This detailed technical application note serves as a comprehensive guide for designing high-precision data acquisition and measurement systems. It features various circuit configurations, including 8-, 10-, and 12-bit analog processing for highly specialized applications. The coverage includes advanced battery monitoring circuits, accurate temperature sensing using RTDs and thermistors across extreme ranges, isolated communication interfaces, and diverse signal conditioning methods. This resource is essential for electrical engineers and designers developing demanding remote monitoring equipment or scientific measurement devices requiring robust data logging capabilities.
Page 1 Text Content
Application Note 62 October 1994
Data Acquisition Circuit Collection Kevin R. Hoskins
INTRODUCTION
This application note features 8-, 10-, and 12-bit data Additional circuit information is located in the information acquisition components in various circuit configurations. references listed in the Circuit Index. Each information The circuits include battery monitoring, temperature sens- reference refers to either an application note (example: ing, isolated serial interfaces, and microprocessor and AN42 = Application Note 42), a data sheet (example: microcontroller serial and parallel interfaces. Also in- LTC®1292 DS = LTC1292 Data Sheet), or a design note cluded are voltage reference circuits (Application Note 42 (example: DN66 = Design Note 66).
contains more voltage reference circuits).
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
CIRCUIT INDEX
INFORMATION
FIGURE TITLE FIGURE NO. PAGE REFERENCE/SOURCE General Analog-to-Digital Application Circuits Two-Quadrant 150k Hz Bandwidth Analog Multiplier Figure 1 AN62-3 LTC1099 DS Infinite Hold-Time Sample-and-Hold (t ACQ = 240ns) Figure 2 AN62-3 LTC1099 DS Four-Quadrant 250k Hz Bandwidth Analog Multiplier Figure 3 AN62-4 Demodulating a Signal Using Undersampling Figure 4 AN62-4 LTC1257 DS Complete 100ps Resolution ∆Time Circuit with “Bow” Correction Figure 5 AN62-5 LTC1282 DS Single 5V 12-Bit Temperature Control System with Shutdown........................................ Figure 6 AN62-6 LTC1257 DS Weight Scale Figure 7 AN62-6 LTC1091/2/3/4 DS Auto-Ranging 8-Channel 12-Bit Data Acquisition System with Shutdown Figure 8 AN62-7 LTC1257 DS Analog-to-Digital Battery Monitoring Application Circuits Micropower Battery Voltage Monitor Figure 9 AN62-8 LTC1096/8 DS 0A to 2A Battery Current Monitor Draws Only 70µA Figure 10 AN62-8 LTC1096/8 DS LTC1297 Data Acquisition System Micropower Battery Current Monitor Figure 11 AN62-9 Temperature Sensing and Conversion Current Output Silicon Sensor Thermometer Driving 10-Bit Analog-to-Digital Converter Covers –55°C to 125°C with 0.2°C Resolution Figure 12 AN62-9 LTC1091/2/3/4 DS Thermistor-Based Temperature Measurement System Covers 20°C to 40°C and 0°C to 100°C with 0.25°C Accuracy Figure 13 AN62-10 LTC1091/2/3/4 DS Digitally Linearized Platinum RTD Signal Conditioner Figure 14 AN62-10 LTC1091/2/3/4 DS Furnace Exhaust Gas Temperature Monitor Covers 0°C to 500°C and Has Low Supply Detection Figure 15 AN62-11 LTC1091/2/3/4/DS Isolated Interfaces Floating Analog-to-Digital Conversion System Powered by Capacitor Charge Pump Figure 16 AN62-11 LTC1096/8 DS Micropower Serial 10-Bit Data Acquisition System with 500V Opto-Isolated Communication Figure 17 AN62-12 LTC1091/2/3/4 DS Opto-Isolated Temperature Monitor Figure 18 AN62-13 LTC1292 DS Battery-Powered Digital Thermometer Transmits Over RF-Link Figure 19 AN62-13 LTC1092 10-Bit Analog-to-Digital Converter Receives Power and Transmits Data Over Two Transformer-Isolated Lines Figure 20 AN62-14 DN19
AN62-1
Page Summary Contents For LINEAR Data Acquisition Circuit Collection Application Note 62
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 340.53 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What type of circuits are covered by Application Note 62?
The note features various data acquisition circuits using 8-, 10-, and 12-bit resolution components for applications like battery monitoring, temperature sensing, and measurement multipliers.
Can the LTC1390 multiplexers be cascaded?
Yes, two LTC1390s can be cascadable serially programmed to provide single channel selection from a larger array, such as connecting an LTC1096 with 16 analog inputs.
What is the temperature range covered by the AN62-9 system?
Figure 12 covers -55°C to 125°C with 0.2°C resolution, while Figure 13 offers measurement systems covering specific ranges like 20°C to 40°C or 0°C to 100°C.
What is the supply voltage range for the LTC1257C,I?
The LTC1257C,I supports a wide supply range from 5V to 15.5V.
Are there dedicated circuits for battery monitoring and current sensing?
Yes, the manual details several sections (AN62-8 and AN62-9) covering micropower battery voltage and current monitors, using parts like LTC1096/8.