App note: Ferrite bead demystified

App note from Analog Devices hinting for proper selection of ferrite bead for you applications. Link here (PDF) An effective method for filtering high frequency power supply noise and cleanly sharing similar supply rails is the use of ferrite beads. A ferrite bead is a passive device that filters high frequency noise energy over a […]

App note: AMR angle sensors

Position measurement sensor using magnetoresistive technology discussed in this app note from Analog Devices. Link here (PDF) Anisotropic magnetoresistive (AMR), thin film materials are becoming increasingly important in today’s position sensing technologies. Magnetoresistive (MR) position measurement has many advantages over traditional technologies. Reliability, accuracy, and overall robustness are the primary factors contributing to the development […]

App note: Replacing mechanical potentiometers with digital potentiometers

Another application note from Analog Devices this time about the superiority of digital over mechanical potentionmenters. Link here (PDF) Potentiometers have been widely used since the early days of electronic circuits, providing a simple way to calibrate a system, adjusting offset voltage or gain in an amplifier, tuning filters, controlling screen brightness, among other uses. […]

App note: Precision signal conditioning for high resolution industrial applications

App note from Analog Devices on robust precision signal conditioning. Link here (PDF) Industrial measurement and control systems often need to interface to sensors while operating in noisy environments. Because sensors typically generate very small electrical signals, extracting their output from the noise can be challenging. Applying signal conditioning techniques, such as amplification and filtering, […]

Controlling an HMC624LP4E RF attenuator using Arduino

Kerry Wong writes: For simplicity, I used a single rotary encoder for controlling the attenuation. In order to prevent accidentally changing the set attenuation value, I used the built-in switch of the rotary encoder as the lock/adjust control. The idea is that the attenuation value can only be adjusted when the switch is in the […]

App note: Capacitor selection guidelines on LDOs

They are different kind of capacitors, selection for one capacitor varies depending on application. A good read app note from Analog Devices. Link here (PDF) Capacitors are underrated. They do not have transistor counts in the billions nor do they use the latest submicron fabrication technology. In the minds of many engineers, a capacitor is […]

App note: DAC ICs: How many bits is enough?

A very old application notes from Analog Devices that tells about Nyquist Theorem, sampling rate and quantization used on DACs. Link here (PDF) At the heart of every digital audio playback system lies the single-most critical component for high-fidelity audio: the digital-to-analog converter (DAC). These converters handle the delicate task of translating the 16-bit binary […]

App note: iCoupler® Isolation in CAN bus applications

Application note from Analog Devices on CAN bus system isolation. Link here (PDF) The intention of this application note is to give the user a brief overview of the CAN bus protocol, focusing on the system physical layer, as well as an understanding of why isolation is so important to the system. This application note […]

App note: Fast Rail-to-Rail operational amplifiers ease design constraints in low voltage high speed systems

Migration to lower rail voltages considerations on operational amplifier designs an Application note from Analog Devices. Link here (PDF) Movement towards lower power supply voltages is driven by the demand that systems consume less and less power coupled with the desire to reduce the number of power supply voltages in the system. Lowering power supply […]

App note: Resolution enhancements of digital potentiometers with multiple devices

An old application note from Analog Devices about configuring multiple digital potentiometers to improve resolution, accuracy and programming complexity might add-up to the mix though. Link here (PDF) Digital potentiometers usually come with standard resistance values of 10k, 100k, and 1MW at a given number of adjustable steps. If an application requires a resistance range […]

App note: Implementing an I2C reset

Interesting app note from Analog Devices when an I2C communication is broken under some circumstances. Link here (PDF) The I2C bus is a high integrity, robust serial bus used for control purposes in many systems. The primary components that make up a system are at least one master and one slave. Under normal conditions, everything […]

App note: Environmental compensation on the AD7142: The effects of temperature and humidity on capacitance sensors

An old but useful application from Analog Devices about things that can affect touch/capacitance sensors. Link here (PDF) Capacitance sensing has the potential to replace current user input mechanisms in consumer devices. Products as diverse as cell phones, digital cameras, MP3 players, and other portable media players are all suitable for implementing capacitance sensing. Capacitance […]

App note: Measuring a loudspeaker impedance profile using the AD5933

An application note from Analog Devices about AD5933, this provides a low cost substitute to expensive test equipment like signal generators, oscilloscope and voltmeters in getting the speaker’s impedance profile. Link here (PDF) This application note describes a circuit architecture using the AD5933 that allows the system designer to measure the impedance profile of the […]

App note: Microcontroller-based serial port interface (SPI®) boot circuit

Simple circuit for sending command upon boot to the target device sortof boostraping hardware tachnique, an app note from Analog Devices. Link here (PDF) This application note describes the operation of a general purpose, microcontroller-based Serial Port Interface (SPI) boot circuit. This is a low cost solution for users who need to modify some of […]

App note: Peak-to-peak resolution versus effective resolution

Effective resolution is superior compared to peak-to-peak resolution when comparing ADCs from different companies. An application note from Analog Devices. Link here (PDF) The low bandwidth, high resolution ADCs have a resolution of 16 bits or 24 bits. However, the effective number of bits of a device is limited by noise. This varies depending on […]

App note: How to successfully apply low dropout regulators

Application note regarding proper usage of LDO from Analog Devices. Link here (PDF) A low dropout (LDO) regulator is capable of maintaining its specified output voltage over a wide range of load currents and input voltages, down to a very small difference between input and output voltages. This difference, known as the dropout voltage or […]

App note: Isolating USB with SPI

Old but still good technical note from Analog Devices on USB isolation. Link here (PDF) Currently, iCoupler® digital isolation technology is capable of transferring data at rates ranging from DC to about 150Mbps, which is adequate for transferring serial data to support low (1.5Mbps) and full (12Mbps) speed modes of USB. There are three places […]

App note: Common-Mode transients in current sense applications

Transient considerations in current sensing especially in motor and solenoids, app note(PDF) from Analog Devices. Current sense amplifiers are used in a variety of applications, such as motor or solenoid control, load current monitoring, and fault detection. In such applications, it is typical for the input common-mode voltage to swing from ground to a certain […]

App note: Complex power supply sequencing made easy

Power sequencing from Analog Devices using their ADP5134 sequencer IC. App note here (PDF) Power supply sequencing is required for microcontrollers, field programmable gate arrays (FPGAs), digital signal processors(DSPs), analog-to-digital converters (ADCs), and other devices that operate from multiple voltage rails. These applications typically require that the core and analog blocks be powered up before […]

App note: Magnetoresistive angle measurement

An angle measurement solution from Analog Devices app note (PDF!). An AMR (anisotropicmagneto resistive) angle measurement solution with 1°angular accuracy over a 180° range. The circuit is ideal for applications where high speed, accurate, non-contact angle measurements are critical. The circuit provides all necessary signal conditioning including instrumentation amplifiers, buffers, and a dual channel ADC […]