Datasheet

24
Signal Chain Design Guide
Related Support Material
AN1297: Microchip’s Op Amp SPICE Macro Models
This application note covers the function and use of
Microchip’s op amp SPICE macro models. It does not
explain how to use the circuit simulator but will give the
user a better understanding how the model behaves and
tips on convergence issues.
AN1353: Rectifiers, Op Amp Peak Detectors
and Clamps
This application note covers a wide range of application,
such as half-wave rectifiers, full-wave rectifiers, peak
detectors and clamps.
Temperature Sensing
AN929: Temperature Measurement Circuits for
Embedded Applications
This application note shows how to select a temperature
sensor and conditioning circuit to maximize the
measurement accuracy and simplify the interface to
the microcontroller.
AN1001: IC Temperature Sensor Accuracy
Compensation with a PIC Microcontroller
This application note derives an equation that describes
the sensor’s typical non-linear characteristics, which can
be used to compensate for the sensor’s accuracy error
over the specified operating temperature range.
AN1154: Precision RTD Instrumentation for
Temperature Sensing
Precision RTD (Resistive Temperature Detector)
instrumentation is key for high performance thermal
management applications. This application note shows
how to use a high resolution Delta-Sigma Analog-to-
Digital converter, and two resistors to measure RTD
resistance ratiometrically. A ±0.1°C accuracy and ±0.01°C
measurement resolution can be achieved across the RTD
temperature range of −200°C to +800°C with a single
point calibration.
Product Related Documentation
Sensor Conditioning Circuits Overview
AN895: Oscillator Circuits for RTD
Temperature Sensors
This application note shows how to design a temperature
sensor oscillator circuit using Microchip’s low-cost
MCP6001 operational amplifier (op amp) and the MCP6541
comparator. Oscillator circuits can be used to provide
an accurate temperature measurement with a Resistive
Temperature Detector (RTD) sensor. Oscillators provide a
frequency output that is proportional to temperature and
are easily integrated into a microcontroller system.
Delta-Sigma ADCs
AN1007: Designing with the MCP3551
Delta-Sigma ADC
The MCP3551 delta-sigma ADC is a high-resolution
converter. This application note discusses various design
techniques to follow when using this device. Typical
application circuits are discussed first, followed by a
section on noise analysis.
AN1030: Weigh Scale Applications for the MCP3551
This application note focusses specifically on load cells,
a type of strain gauge that is typically used for measuring
weight. Even more specifically, the focus is on fully active,
temperature compensated load cells whose change in
differential output voltage with a rated load is 2 mV to
4 mV per volt of excitation (the excitation voltage being the
difference between the +Input and the −Input terminals of
the load cell).
SAR ADCs
AN845: Communicating With The MCP3221 Using
PIC Microcontrollers
This application note will cover communications
between the MCP3221 12-bit A/D Converter and a PIC
microcontroller. The code supplied with this application
note is written as relocatable assembly code.