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Application Notes

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  Delta Sigma ADC Bridge Measurement Techniques &mdash AN96
  PDF, 232 Kb, File published: Jan 17, 2005
  AN96 features several applications that demonstrate how to take full advantage of Linear Technology's delta sigma ADCs when interfacing to sensors. In many cases, signal conditioning can be greatly simplified or eliminated completely. This note explains where it is appropriate to use amplifiers and how to optimize amplifier gain. Also included are discussions on measuring effective number of bits (ENOB) and the relationship to instrument performance, frequency response of delta sigma ADCs, and test techniques. C source code for all of the applications is included to aid firmware development.
  Extract from the document

  Application Note 96
  January 2005
  Delta Sigma ADC Bridge Measurement Techniques
  Mark Thoren
  Introduction In a typical 12-bit measurement system, the signal conditioning amplifier requires a very high gain in order to make
  use of the full ADC input range. A sensor with a 10mV fullscale output requires a gain of 500 to use the full input
  range of a typical 5V input ADC. A filter may be required to
  reduce noise at the expense of settling time. Additional
  difficulties arise when dealing with the large common
  mode voltage typical of a bridge sensor. Most instrumentation amplifiers have a large discrepancy between the
  typical CMRR and guaranteed minimum, which may require an additional trim. Sensors for pressure, load, temperature, acceleration and
  many other physical quantities often take the form of a
  Wheatstone bridge. These sensors can be extremely linear
  and stable over time and temperature. However, most
  things in nature are only linear if you don’t bend them too
  much. In the case of a load cell, Hooke’s law states that the
  strain in a material is proportional to the applied stress—
  as long as the stress is nowhere near the material’s yield
  point (the “point of no return” where the material is
  permanently deformed). The consequence is that a load
  cell based on a resistance strain gauge will have a very
  small electrical output—often only a few millivolts. In
  spite of this, instruments with 100,000 counts of resolution and more are possible. This Application Note presents …

Articles

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  24-Bit ADC Challenges О”ОЈ Conventions &mdash LT Journal
  PDF, 242 Kb, File published: Mar 1, 2003
  Extract from the document

  LINEAR TECHNOLOGY MARCH 2003 Issue Highlights .2
  LTCВ® in the News .2
  DESIGN FEATURES
  Micropower SOT-23 Buck Regulator
  Accepts Inputs to 34V .6
  Jeff Witt High Performance 3-Phase Power
  Supplies Yields High Efficiency over
  the Entire CPU Load Range.9
  Wei Chen and Steve Hobrecht Triple and Quad RGB Amplifiers
  Deliver Full Performance on 3.3V
  .13
  Jon Munson and Raj Ramchandani Versatile Over-The-TopВ® Precision
  Comparator is Ideal for Status
  Monitoring.16
  Jon Munson Dual Smart Card Interface Simplifies
  Multicard Reader Designs.19
  Steven Martin Very Low Dropout (VLDOв„ў) Linear
  Regulator Outperforms Switching
  Regulators in Low VOUT Applications
  .22
  Anthony Bonte Next Generation No Compromise
  Battery Chargers .24
  Mark Gurries –48V Hot Swapв„ў Controller Offers …

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Manufacturer's Classification

• Data Conversion > Analog-to-Digital Converters (ADC) > Precision ADCs (Fs < 10Msps) > Single Channel ADCs