Signal Chain Design Guide Microchip Technology-PDF Free Download

Signal Chain Design Guide Microchip Technology
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Signal Chain Overview, Typical sensor applications involve the monitoring of The MCU controls the actuators and maintains the. sensor parameters and controlling of actuators The operation of the sensor signal conditioning circuits based. sensor signal chain as shown below consists of analog on the condition of the signal detection In the digital. and digital domains Typical sensors output very low to analog feedback path the digital to analog converter. amplitude analog signals These weak analog signals DAC digital potentiometer and Pulse Width Modulator. are amplified and filtered and converted to digital values PWM devices are most commonly used The MOSFET. using op amps analog to digital or voltage to frequency driver is commonly used for the interface between the. converters and are processed at the MCU The analog feedback circuit and actuators such as motors and valves. sensor output typically needs proper signal conditioning Microchip offers a large portfolio of devices for signal. before it gets converted to a digital signal chain applications. Typical Sensor Signal Chain Control Loop, Analog Domain Digital Domain. Filter V to Freq, Potentiometer, Motors Valves, Relays Switches MOSFET DAC PWM. Speakers Horns Op Amp, 2 Signal Chain Design Guide. Sensor Overview, Many system applications require the measurement of a There are sensors that respond to these phenomena by.
physical or electrical condition or the presence or absence producing the following electrical properties. of a known physical electrical or chemical quantity Analog Voltage. sensors are typically used to indicate the magnitude or Current. change in the environmental condition by reacting to the Resistance. condition and generating a change in an electrical property. Capacitance, as a result, Typical phenomena that are measured are. This electrical property is then conditioned by an analog. Electrical signal and properties, circuit before being driven to a digital circuit In this way. Magnetic signal and properties the environmental condition can be measured and the. Temperature system can make decisions based on the result. The table below provides an overview of typical, Force weight torque and pressure phenomena the type of sensor commonly used to measure. Motion and vibration the phenomena and electrical output of the sensor. For additional information please refer to, Fluid level and volume Application Note AN990. Light and infrared, Chemistry gas, Summary Of Common Physical Conditions and Related Sensor Types.
Phenomena Sensor Electrical Output, Hall Effect Voltage. Magneto Resistive Resistance, Thermocouple Voltage. RTD Resistance, Temperature Thermistor Resistance, IC Voltage. Infrared Current, Capacitive Capacitance, Infrared Current. Strain Gauge Resistance Voltage, Load Cell Resistance.
Force Weight Torque Pressure, Piezoelectric Voltage or Charge. Mechanical Transducer Resistance Voltage Capacitance. LVDT AC Voltage, Piezoelectric Voltage or Charge, Motion and Vibration Microphone Voltage. Ultrosonic Voltage Resistive Current, Accelerometer Voltage. Magnetic Flowmeter Voltage, Mass Flowmeter Resistance Voltage. Flow Ultrasound Doppler Frequency, Hot wire Anemometer Resistance.
Mechanical Transducer turbine Voltage, Ultrasound Time Delay. Mechanical Transducer Resistance Voltage, Fluid Level and Volume Capacitor Capacitance. Switch On Off, Thermal Voltage, Capacitance Voltage. Touch Inductance Current, Resistance Frequency, Capacitance Voltage Frequency. Proximity Inductance Current Frequency, Resistance Voltage Current.
Light Photodiode Current, pH Electrode Voltage, Solution Conductivity Resistance Current. Chemical CO Sensor Voltage or Charge, Photodiode turbidity colorimeter Current. Ion Sensor Current, Signal Chain Design Guide 3, Product Overviews. Operational Amplifiers Op Amps Programmable Gain Amplifier PGA. Microchip Technology offers a broad portfolio of op amp The MCP6S21 2 6 8 and MCP6S91 2 3 PGA families. families built on advanced CMOS technology These give the designer digital control over an amplifier using. families are offered in single dual and quad configurations a serial interface SPI bus An input analog multiplexer. which are available in space saving packages with 1 2 6 or 8 inputs can be set to the desired input. signal The gain can be set to one of eight non inverting. These op amp families include devices with Quiescent. gains 1 2 4 5 8 10 16 and 32 V V In addition a, Current Iq per amplifier between 0 45 A and 6 mA. software shutdown mode offers significant power savings. with a Gain Bandwidth Product GBWP between 9 kHz, for portable embedded designs This is all achieved in.
and 60 MHz respectively The op amp with lowest supply. one simple integrated part that allows for considerably. voltage Vdd operates between 1 4V and 6 0V while the op. greater bandwidth while maintaining a low supply current. amp with highest Vdd operates between 6 5V and 16 0V. Systems with multiple sensors are significantly simplified. These op amp families fall into the following categories. The MCP6G01 family are analog Selectable Gain Amplifiers. General Purpose Precision including EPROM Trimmed and. SGA The Gain Select input pin s set a gain of 1 V V. mCal Technology and Zero Drift, 10 V V and 50 V V The Chip Select pin on the. MCP6G03 puts it into shutdown to conserve power, Instrumentation Amplifiers INA. Microchip has expanded its portfolio of amplifiers with the Analog to Digital Converters ADC. industry s first instrumentation amplifier featuring mCal. Microchip offers a broad portfolio of high precision. technology The MCP6N11 features rail to rail input and. Delta Sigma SAR and Dual Slope A D Converters The, output 1 8V operation and low offset offset drift. MCP3550 1 3 Delta Sigma ADCs offer up to 22 bit, resolution with only 120 A typical current consumption. Comparators in a small 8 pin MSOP package The MCP3421 is a single. Microchip offers a broad portfolio of low power and channel 18 bit Delta Sigma ADC and is available in a small. high speed comparators The MCP6541 and MCP6561 6 pin SOT 23 package It includes a voltage reference. family of comparators provide ultra low power 600 nA and PGA The user can select the conversion resolution. typical and higher speed with 40 ns propagation delay up to 18 bits The MCP3422 3 and the MCP3424 are. respectively Both families of comparators are available two channel and four channel versions respectively of. with single dual and quad as well as with push pull and the MCP3421 device The MCP300X 10 bit MCP320X. open drain output options for MCP6546 and MCP6566 12 bit and MCP330X 13 bit SAR ADCs combine high. The MCP65R41 and MCP65R46 family of push pull and performance and low power consumption in a small. open drain output comparators are offered with integrated package making them ideal for embedded control. reference voltages of 1 21V and 2 4V receptively This applications The MCP3911 analog front end offer two. family provides 1 typical tolerance while consuming simultaneously sampled 24 bit Delta Sigma ADCs making. 2 5 A and high speed with 4 s propagation delay These it ideal for voltage and current measurement and other. comparators operate with a single supply voltage as low data acquisition applications. as 1 8V to 5 5V which makes them ideal for low cost. and or battery powered applications The Analog to Digital Converter Design Guide Microchip. Document No 21841 shows various application, examples of the ADC devices.
Microchip also offers many high accuracy energy metering. devices which are based on the Delta Sigma ADC cores. The Complete Utility Metering Solution Guide Microchip. Document No 24930 offers detailed solutions for, metering applications. 4 Signal Chain Design Guide, Product Overviews, Voltage References Digital to Analog Converters DAC. Microchip offers the MCP15XX family of low power and low Microchip s family of Digital to Analog Converters DACs. dropout precision Voltage References The family includes offer a wide range of options These devices support the. the MCP1525 with an output voltage of 2 5V and the 6 bit through 12 bit applications Offering both volatile. MCP1541 with an output voltage of 4 096V Microchip s and non volatile options and standard SPI and I2C digital. voltage references are offered in SOT23 3 and TO 92 interfaces These devices are offered in small packages. packages such as 6 lead SC70 SOT 23 and DFN 2 2 for the. single output devices and 10 pin MSOP for quad output. Temperature Sensors devices Some versions support selecting either the. Microchip offers a broad portfolio of thermal management device Vdd the external voltage reference or an internally. products including Logic Output Voltage Output and generated voltage reference source from the DAC circuitry. Serial Output temperature sensors These products allow Devices with nonvolatile memory EEPROM allow the. the system designer to implement the device that best device to retain the programmed output code and DAC. meets the application requirements Key features include state through power down events. high accuracy such as MCP9808 with 0 5 C maximum These DAC devices provide high accuracy and low noise. accuracy from 20 C to 100 C low power extended and are ideal for industrial applications where calibration. temperature range and small packages In addition other or compensation of signals such as temperature. Microchip products can be used to support Thermocouple pressure or humidity is required. RTD and Thermistor applications, Digital Potentiometers. Microchip s family of digital potentiometers offer a wide. range of options These devices support the 6 bit through. 8 bit applications Offering both volatile and non volatile. options with digital interfaces from the simple Up Down. interface to the standard SPI and I2C interfaces These. devices are offered in small packages such as 6 lead. SC70 and 8 lead DFN for the single potentiometer devices. 14 lead TSSOP and 16 lead QFN packages for the dual. potentiometer devices and 20 lead TSSOP and QFN, packages for the quad potentiometer devices Non volatile. devices offer a Wiperlock Technology feature while. volatile devices will operate down to 1 8V Resistances. are offered from 2 1 k to 100 k Over 50 device, configurations are currently available.
The Digital Potentiometer Design Guide Microchip, Document No 22017 shows various application. examples of the digital potentiometer devices, Signal Chain Design Guide 5. Local Sensors, Local Sensing Sensors and Applications. Local sensors are located relatively close to their signal Single Sensors. conditioning circuits and the noise environment is not. T hermistors for battery chargers and power supply. severe most of these sensors are single ended not, differential Non inverting amplifiers are a good choice for temperature protection. amplifying most of these sensors output because they Humidity Sensors for process control. have high input impedance and require a minimal amount Pyroelectric infrared intrusion alarms motion detection. of discrete components and garage door openers, Smoke and fire sensors for home and office.
Key Amplifier Features Charge amplifier for Piezoelectric Transducer detection. Low cost Thermistor for battery chargers and home thermostats. General purpose op amps LVDT position and rotation sensors for industrial control. High precision Hall effect sensors for engine speed sensing and. Low offset op amps door openers, Zero drift op amps Photoelectric infrared detector. Low noise op amps Photoelectric motion detectors flame detectors. Rail to rail input output intrusion alarms, Most op amp families Sensing resistor for current detection. High input impedance, Op amps with CMOS inputs, Multiple Local Sensors. Low power and portable applications Temperature measurement at multiple points on a Printed. Circuit Board PCB, Low power op amps, Sensors that require temperature correction. High voltage, Weather measurements temperature pressure.
High voltage op amps, humidity light, High bandwidth and slew rate. High speed op amps Capacitive Humidity Sensor Circuit. Load drive PIC16F690DM PCTLHS, High output drive op amps. Classic Gain Amplifier C1, PIC16F690 VINT, MCP6XX CSEN. pH Monitor MCP6XXX VSEN, Timer1 P2 VCM, High Side Current Sensing Amplifier C2. R1 R2 Latch, Comparator U2, VOUT MCP6291, RSEN ISEN MCP6HXX.
RSEN R1 R2, VOUT V1 V2 REF, 6 Signal Chain Design Guide. Remote Sensors, Remote Sensing Differential Amplifier. All sensors in a high noise environment should be, considered as remote sensors Also sensors not located. on the same PCB as the signal conditioning circuitry are VREF. remote Remote sensing applications typically use a EMI. differential amplifier or an instrumentation amplifier. Key Amplifier Features MCP6VXX, Differential input MCP616. Thermocouple Circuit Using an INA, High Precision THJ.
Low Offset Op Amps Hot Junction ADC, Auto zeroed Op Amps TCJ 2. Cold Junction VREF, Low Noise Op Amps, Temp Sensor. Sensors and Applications 2, High temperature sensors. Thermocouples for stoves engines and process, RTDs for ovens and process control. Wheatstone Bridges, Pressure sensors for automotive and industrial.
feedback circuit and actuators such as motors and valves Microchip offers a large portfolio of devices for signal chain applications Signal Chain Design Guide 3 Many system applications require the measurement of a physical or electrical condition or the presence or absence of a known physical electrical or chemical quantity Analog sensors are typically used to indicate the magnitude or

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