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 […]

app note: Isolating I2C interfaces

an I2C isolation solution from Analog Devices, app note can be found here. The Inter-Integrated Circuit (I2C®) bus is a two-wire bidirectional bus used for low speed, short-distance communication between integrated circuits. Developed by Philips 1980 in the early 1980s for use amongst ICs on a single board, I2C today is increasingly being used in […]

app note: Digital Potentiometers: Frequently Asked Questions

FAQ on Analog Device’s digital Potentiometers. App note here. A digiPOT is a digitally controlled resistor that changes the impedance between the terminals and wiper depending on the code loaded in the RDAC register. Digital potentiometers avoid the problems that mechanical potentiometers face, such as physical size and wear and tear, as well as sensitivity […]

app note: How to Oversample 5 MSPS, 18-Bit/16-Bit Precision SAR Converters to Increase Dynamic Range

Here’s how you can maximize your ADC’s Dynamic Range by oversampling, an app note from Analog Devices. One of the ways to achieve a higher dynamic range is to oversample the converter to accurately monitor and measure both small and large input signals from the sensors. There are a number of other ways to increase […]

App note: Biasing and decoupling op amps in single supply applications

Op amps needs dual supply in order to get a full output swing from its input fed signal, here’s a good app note from Analog Devices on powering op amps using only a single supply. Battery-powered op amp applications such as those found in automotive and marine equipment have only a single available power source. […]

App note: Build precise S/H Amps for fast 12 Bit ADCs

An app note from Analog Devices: Build precise S/H Amps for fast 12 Bit ADCs (PDF!) S/h amplifier circuits will use one of several standard architectures: closed-loop or open-loop, and inverting or noninverting configurations. No matter what circuit type designers employ, they need to incorporate a high-speed amplifier to buffer the input signal and a […]

Analog Devices releases free version of RF design tool

Analog Devices, Inc. (ADI) released a new version of its popular ADIsimRF design tool: The free design tool is the software accompaniment to ADI’s complete portfolio of RF-to-digital functional blocks, allowing engineers to model RF signal chains using devices from across ADI’s RF IC and data converter portfolio. ADIsimRF Version 1.7 adds a number of […]

App note: Filtering 101 whiteboard series

Here’s a series of video tutorials on filtering from Analog Devices. First in the series (embedded above) covers simple single pole filters made out of resistors and capacitors. The series moves onto active filtering with op-amps, and finishes with multi-pole Sallen-Key filters. Geek alert: theory and math zone!

App Note: Practical guide to high-speed PCB layout

Here’s an article from Analog Devices going into the details of high-speed PCB layout design. While the article mainly focuses on analog electronics, lots of good tips can be picked up for digital designers as well. Intelligent circuit-board layout is important to successful op-amp circuit design, especially for high-speed circuits. A good schematic is the […]

App note: Detecting human falls with 3-axis accelerometers

Here is an article from Analog Devices discussing the theory and application of detecting human falls with 3-axis accelerometers. While the article focuses on the ADXL345 3-axis accelerometers, the theory and principle behind it can be applied to other devices as well. This article, based on research into the principles of fall detection for an […]