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 […]

App note: Difference amplifier vs. current-sense amplifier for high side current measurement

Here’s an article from Analog Devices detailing the differences between current-sense amplifiers and difference amplifiers in high side current measurement. Current sense amplifiers offer measurement of the instantaneous current, while difference amplifiers offer average current measurements.  While current-sense amplifiers offer better current consumptions and lower noise, the difference amplifiers are more robust. Both types of […]

App note: Eliminating audio system noise from HDTV

How HDTV systems impact audio noise, and how to limit it: Ensuring a pop and click free audio signal chain requires careful design on behalf of both the hardware engineer and software engineer. This article discusses how hardware system and software functionality issues cause pops and clicks and how engineers can prevent them

App note: Pitfalls of trusting the datasheet

Analog Devices explains when the maximum supply current given by the datasheet could lead you astray: For most integrated circuits, a maximum supply current is listed on the data sheet. Often overlooked are the measurement conditions. For some rail-to-rail output op amps, certain operation can result in supply currents two to ten times higher than […]

App note: Layered isolation with high power digital isolators

Sequentially connecting optocouplers for better isolation slows things way down, digital isolators don’t suffer as much. The advantages of digital isolators over opto-couplers [PDF!] in layered isolation: Creating double insulation barriers with sequential optocouplers is problematic because the data integrity is poor, and there is no compact inexpensive way to provide power to the interface […]

App note: Theory behind ground loops

Analog Devices discusses ground loops and how to manage them: Transmitting data over long distances is fraught with potential problems. A ground loop can be a source of interference that can induce a noise voltage between the grounds on either end of the transmission. If this voltage is large enough, it can cause data errors […]

App note: Understanding microphone sensitivity

Analog Devices discusses the sensitivity of analog and digital microphones. Sensitivity, the ratio of the analog output voltage or digital output value to the input pressure, is a key specification of any microphone. Mapping units in the acoustic domain to units in the electrical domain determines the magnitude of the microphone output signal, given a […]