Microchip Technology Inc

Amplifiers & Linear

This board supports the capacitive humidity sensor application note AN1016. It measures the capacitance of a relative humidity sensor plugged into the board. The on-board microcontroller sends the measured and calculated relative humidity (RH) to a PC for display.

The board can also measure small capacitors in different ranges of values using a dual slope integration method. The board can be modified, if desired, to achieve better measurement resolution.

The MCP6031 Photodiode PICtail™ Plus Demo Board demonstrates how to use a transimpedance amplifier, which consists of MCP6031 high precision op amp and external resistors, to convert photo-current to voltage.
The MCP6421 EMIRR Evaluation Board is intended to support the electromagnetic interference rejection ratio (EMIRR) measurement and to show the electromagnetic interference (EMI) rejection capability of the MCP6421 operational amplifier.

Devices Supported: MCP6421
The MCP651 Input Offset Evaluation Board is intended to provide a simple means to measure the MCP651 Input Offset Evaluation Board op amp’s input offset voltage under a variety of operating conditions. The measured input offset voltage (VOST) includes the input offset voltage specified in the data sheet (VOS) plus changes due to: power supply voltage (PSRR), common mode voltage (CMRR), output voltage (AOL), input offset voltage drift over temperature (ΔVOS/ΔTA) and 1/f noise.

The MCP651 Input Offset Evaluation Board works most effectively at room temperature (near +25°C). Measurements at other temperatures should be done in an oven where the air velocity is minimal.

This demo board uses the MCP661 in a very basic application for high-speed op amps; a 50Ω line (coax) driver. It gives:
  • A 30 MHz solution
  • High speed PCB layout techniques
  • A means to test AC response, step response and distortion
Both the input and the output are connected to lab equipment with 50Ω BNC cables. There are 50Ω terminating resistors and transmission lines on the board. The op amp is set to a gain of 2V/V to overcome the loss at its output caused by the 50Ω resistor at that point. Connecting lab supplies to the board is simple; there are three surface mount test points provided for this purpose.

The MCP6H04 Evaluation Board is intended to support an instrumentation amplifier and show the capability of the MCP6H04 operational amplifier. It uses a quad op amp in a difference amplifier configuration with input buffers and voltage reference. The test points for the power supply, ground, input signals, output signals, and voltage reference allow lab equipment to be connected to the board.

Devices Supported: MCP6H04
This board demonstrates the performance of Microchip’s MCP6N11 instrumentation amplifier (INA) and a traditional three op amp INA using Microchip’s MCP6V26 and MCP6V27 auto-zeroed op amps. The input signal comes from an RTD temperature sensor in a Wheatstone bridge. Real world interference is added to the bridge’s output, to provide realistic performance comparisons. Data is gathered and displayed on a PC, for ease of use. The USB PICmicro® microcontroller and included Graphical User Interface (GUI) provides the means to configure the board and collect sample data.
Use the MCP6S22 PGA PICtail™ Demo Board to evaluate and demonstrate Microchip Technology’s MCP6S21/2/6/8 Programmable and MCP6S91/2/3 Gain Amplifier (PGA) families.

Interface this board with Microchip’s PICkit™ 1 Flash Starter Kit to demonstrate firmware integration between the PIC MCU and PGA devices, while allowing you to modify and develop firmware for your specific requirements

The MCP6S22 PGA PICtail™ Demo Board can also be used in stand-alone mode, wherein the board uses a:

  • USB interface to communicate directly to a Personal Computer (PC)
  • Graphical User Interface (GUI) to display the PGA output voltage

The MCP6S2X PGA Evaluation Board (Rev. 4) features the MCP6S21/91 and MCP6S26 devices. The PGA devices interface to a PIC16F676 providing versatile selection of input channels and gains to evaluate device performance. The board supports multiple input signal sources and two devices are cascaded to produce a gain between 1 V/V and 1024 V/V.

The MCP6SX2 PGA Photodiode PICtail™ Demo Board features a PNZ334 photodiode, MCP6001U op amp, and MCP6S22 and MCP6S92 Programmable Gain Amplifiers (PGA).

The op amp converts the photodiode’s output current to voltage (transimpedance amplifier). Its output goes to one of the PGA’s inputs. The other PGA input is available for any other desired source. This opens the possibilities of processing other sensor signals, and of increasing the number of PIC® microcontroller I/O pin available for other purposes.

This board works with the PICkit™ 1 Flash Starter Kit (see DS40051) and the Signal Analysis PICtail™ Daughter Board (see DS51476). With these additional tools, a complete solution is achieved: PC software interface, PICmicro® microcontroller, firmware programmability, 10-bit ADC (on the microcontroller), and firmware (with re-locatable assembler code) for the microcontroller.

The MCP6SX2 PGA Thermistor PICtail Demo Board features the MCP6S22 and MCP6S92 Programmable Gain Amplifiers (PGA). These devices help:

  • Overcome the non-linear response of the on-board NTC thermistor
  • Provide multiplexing between two inputs; the other input can be any desired source. This opens the possibilities of temperature correcting another sensor, and of increasing the number of PIC® microcontroller I/O pins available for other purposes.

Two on-board variable resistors allow users to experiment with different designs on the bench. DIP switches on the board select certain resistors (in a binary weighted sequence) to add together, thereby emulating the series resistor in the voltage divider and the thermistor’s change in resistance over temperature.


A complete solution is achieved by interfacing this board to the PICkit™ 1 Flash Starter Kit (see DS40051) and the Signal Analysis PICtail™ Daughter Board (see DS51476). The solution provides:

  • PC software interface
  • PICmicro microcontroller
  • Firmware programmability
  • 10-bit ADC (on the microcontroller)
  • Firmware (with re-locatable assembler code) for the microcontroller.
The MCP6V01 Input Offset Demo Board is intended to provide a simple means to measure the MCP6V01/2/3 op amps input offset voltage (VOS) under a variety of bias conditions. This VOS includes the specified input offset voltage value found in the data sheet plus changes due to power supply voltage (PSRR), common mode voltage (CMRR), output voltage (AOL) and temperature (IVOS/ITA).
The MCP6V01 Thermocouple Auto-Zeroed Reference Design demonstrates how to use a difference amplifier system to measure electromotive force (EMF) voltage at the cold junction of thermocouple in order to accurately measure temperature at the hot junction. This can be done by using the MCP6V01 auto-zeroed op amp because of its ultra low offset voltage (VOS) and high common mode rejection ratio (CMRR)

Devices Supported: MCP6V01 Auto-Zeroed Op Amp
The MCP6XXX Amplifier Evaluation Board 2 supports inverting summing amplifiers and non-inverting summing amplifiers

At this time, the Mindi™ Amplifier Designer does not support the non-inverting summing amplifier.
The MCP6XXX Amplifier Evaluation Board 3 is designed to support the difference amplifier circuits which are generated by the Mindi™ Amplifier Designer.

The MCP7941X RTCC PICtail™ Plus Daughter Board demonstrates the features and abilities of the MCP7941X and MCP7940X I²C™ Real-Time Clock/Calendar family in standard development platforms. By designing this daughter board with the PICtail Plus, PICtail and PICkit™ serial connectors, it will operate with the Explorer 16 Development Board, the PICDEM PIC18 Explorer Board, the XLP 16-bit Development Board and the PICkit Serial Analyzer tool. A 3V, 2032-size coin cell battery (not included) can be installed in the coin cell holder for backup power. Package contents includes the RTCC PICtail Plus Daughter Board and an Info Sheet.
The MCP795XX PICtail™ Plus Daughter Board demonstrates the features and abilities of the MCP795XX SPI Real-Time Clock/Calendar (RTCC) family in standard development platforms. This daughter board will support the full featured 14-pin MCP795W2X and MCP795W1X devices. By designing this daughter board with both PICtail and PICtail Plus connectors, it will operate with the Explorer 16 Development Board and the PICDEM PIC18 Explorer Board. Also included is a 3V coin cell battery for backup power to the RTCC.
The MIC23158/9 Evaluation Board has been developed to evaluate the capabilities of the MIC23158/9 family of devices. The board is populated with the MIC23159 device and it’s set for the following voltages:
•Regulator 1: 1.8V.
•Regulator 2: 1.5V.
The evaluation board can be easily modified by interchanging the MIC23159 device with MIC23158.​
The MIC23158/9 Evaluation Board features independent Enable connectors with individual pull-up resistors.
To check the status of each regulator, power-good connectors are available for each regulator. The board can be powered from two independent voltage sources or a 0Ω resistor can be placed on R3 so that both converters be powered form the same voltage source.
The MIC5280 is a high performance low dropout regulator, offering a very low noise output with a very wide input voltage operating range, from 4.5V to 120V DC input voltage. Ideal for high input voltage applications such as industrial and telecom, the MIC5280 offers 2% initial accuracy, extremely high power supply rejection ratio (PSRR > 80dB) and low ground current (typically 30µA). The MIC5280 can also be put into a zero-off-mode current state, drawing minuscule amount of current when disabled. The MIC5280 has a very wide input voltage range, with DC rated from –24V to +120V. This wide input range of the MIC5280 makes it ideal for harsh environment applications.

Precautions
The evaluation board does not have reverse polarity protection. Applying a negative voltage lower than –24V to the VIN (J1) terminal may damage the device.  The MIC5280 evaluation board is tailored for a 4.5V to 120V input voltage range. The input voltage range should not exceed 120VDC on the input.
The PAC1921 is a dedicated power monitoring device with a configurable analog output. This device is unique in that all power related information is available on the 2-wire/I2C© compatible interface and power, current, or voltage is available on the analog output..  The PAC1921 High-Side Current/Power Sensor Evaluation Board package provides users with the means to exercise device functionality while connected either to target systems (Sys Mode) or while utilizing onboard sources (Demo Mode).