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 […]

App note: Common audio inter-IC protocols

Here is a design article from EETimes about the common inter-IC audio protocols. The article covers the traditional audio signal chain, fully digital audio signal chains, I2S protocol, and PDM. As audio integrated-circuit (IC) designs move to finer geometries, it becomes more difficult to design, and less cost-effective to integrate, high-performance analog circuits on the […]

App note: Digital to analog interface fundamentals

Analog Devices describes the fundamentals of working with digital-to-analog converters: This tutorial outlines some important issues regarding DAC interface circuitry including the voltage reference, analog output, data input, and clock driver. Because ADCs require references and clocks also, most of the concepts presented in this tutorial regarding these subjects apply equally to ADCs.

App note: A reference design for high-performance, low-lost weigh scales

Bearmos tipped us about this reference design¬† from Analog Devices for high-performance, low cost weigh scales. The design uses load-cell, and a load-cell ADC AD7799. The trend in weigh scales towards higher accuracy and lower cost has produced an increased demand for high-performance analog signal processing at low cost. The scope of this requirement is […]

Analog Devices op amp selection guide

Ian Griffiths writes to inform us of this Op Amp Selection Guide available from Analog Devices. This 58-page PDF offers a complete overview of their product offerings. As Ian G. points out, “it has 3 pages devoted to different terms used for describing op-amp characteristics and different op-amp types to help those trying to select […]

App note: Noise sources in low dropout (LDO) regulators

Looking for a clean power supply for a sensitive analog circuit? Analog Devices describes the sources of noise in LDO voltage regulators, and provides some examples to limit and combat the noise. In general, LDO noise comprises two components: intrinsic, or internally generated noise, and extrinsic, or externally generated noise. Thermal and 1/f noise are […]

App note: Thermocouples, and design guidelines for AD59X TC amplifiers

Analog Devices has an app note on thermocouple basics, and some guidelines on how to design projects with their AD595 and AD594 thermocouple amplifiers. Temperature is the most frequently measured physical parameter. However, the techniques of temperature measurement are grossly misunderstood, often resulting in serious inaccuracies or meaningless data. Thermocouples are basically two wires made […]

ADUCRF101: precision analog microcontroller with ISM band transceiver

Analog Devices, Inc. announces the release of the ADuCRF101, a fully integrated System On Chip (SOC) solution designed for low power wireless applications. The ADuCRF101 integrates a low power Cortex-M3 core from ARM. It is a 32-bit RISC machine, offering up to 1.25 DMIPS peak performance. The Cortex-M3 MCU also has a flexible 14-channel DMA […]