Sample circuit of high precision programmable current source from Analog Devices. Link here (PDF) Digitally controlled current sources are critical functions in a variety of applications, such as power management, solenoid control, motor control, impedance measurement, sensor excitation, and pulse oximetry. Here we describe three current sources with serial interface digital control using DACs, op […]
Tag Archives: Analog Devices
App note: Low cost, level shifted low side current monitor for negative high voltage rails
Low side current monitoring sample circuit from Analog Devices. Link here (PDF) The circuit monitors current in individual channels of −48 V to better than 1% accuracy. The load current passes through a shunt resistor, which is external to the circuit. The shunt resistor value is chosen so that the shunt voltage is approximately 50 […]
App note: LT6703 AC line overcurrent indicator
App note from Analog Devices about a low power overcurrent indicator circuit using their micropower comparator LT6703. Link here This circuit design is to monitor the average current in an AC line-connected load and to illuminate an LED if it exceeds a specified level.
App note: Extending op amp operating range via bootstrapping
App note from Analog Devices discussing bootstrapping its rail voltage to compensate operating range of an op amp. Link here (PDF) When an off the shelf operational amplifier (op amp) cannot provide the signal swing range needed for a particular application, the engineer is faced with using a high voltage op amp or designing a […]
App note: The effect of long-term drift on voltage references
App note from Analog Devices on ways to eliminate drifts on voltage refs. Link here (PDF) Long-Term Drift (LTD) in voltage references is a parameter that can be confusing and misleading. It is given as a typical parameter in data sheets, but can cause significant accuracy limitations in system. Unlike tempco and initial accuracy, where […]
App note: Integrated power supply solution for vehicle tracking system
This evaluation board from Analog Devices features reliable and uninterruptible power supply for vehicle tracking system. Link here (PDF) A vehicle tracking system (VTS) is typically installed in cars and trucks. A VTS provides real-time information about the speed, location, and direction of the vehicle using technology, such as a global positioning system (GPS). For […]
App note: Using an accelerometer for inclination sensing
Application note from Analog Devices to calculate for inclination angle from a single, dual or triple-axis accelerometers. Link here (PDF) One common method for determining the tilt or inclination of a system is to integrate the output of a gyroscope. Although this method is straightforward, error associated with null bias stability can quickly compound as […]
App note: Some thoughts on DC/DC converters
Basis App note of modern DC/DC converters from Analog Devices. Link here (PDF) Many systems require that the primary source of DC power be converted to other voltages. Battery driven circuitry is an obvious candidate. The 6V or 12V cell in a laptop computer must be converted to different potentials needed for memory, disc drives, […]
App note: The Alexander Current-Feedback audio power amplifier
An old App note for audio enthusiast from Analog Devices about Current-Feedback approach in audio power amps its designs and history by Mark Alexander. Link here (PDF) The subject of power amplifier design is one of those controversial areas of audio engineering that continues to receive intense debate, despite the fact that there are literally […]
App note: Paralleling linear regulators made easy
Various configuration of linear regulator for parallel operation discussed in this technical article from Analog Devices. Link here Linear regulators provide a simple, low noise solution for dc-dc regulation. However, at higher VIN-VOUT differentials the low efficiency and high power dissipation of linear regulators limits the amount of output current that can realistically be delivered. […]
App Note: Optimizing CAN node bit timing to accommodate digital isolator propagation delays
Adding robustness by digital isolation and compensating for propagation delays to CAN network presented in this technical article from Analog Devices. Link here (PDF) Controller area network (CAN), standardized under ISO 11898, is widely used in industrial and automotive applications. CAN protocols such as DeviceNet or CANOpen rely on the built-in error checking and differential […]
App note: RS-485 communication link vs. the electric fence, A demonstration of RS-485 EMC robustness
Analog Devices’ RS-485 robustness demonstration by direct application of HV transient to the communication line. Link here Industrial and instrumentation applications (I&I) require transmission of data between multiple systems, often over very long distances. The RS-485 bus standard is one of the most widely used physical layer bus designs in I&I applications. Applications for RS-485 […]
App note: Using ESD diodes as voltage clamps
App note from Analog Devices on improving robustness of an amplifier by determining and mitigating internal ESD diode clamp electrical overestress. Link here When external overvoltage conditions are applied to an amplifier, ESD diodes are the last line of defense between your amplifier and electrical over stress. With proper understanding of how an ESD cell […]
App note: A sensible 30A energy meter
Technical paper from Analog Devices about wide range energy meter LTC2947 that eliminates the need for unique and expensive sense resistor values. Link here (PDF) Monitoring energy has similar benefits in many applications, not just solar. Handheld, rack-mounted and in-line energy meters are widely available and can be used by people such as facility managers […]
App note: Digital loops are not the same as analog loops
Read this technical note from Analog Devices between the difference between digital and analog loops. Link here
App note: Monitoring additional supplies with the ADM1062–ADM1069 super sequencers
App note from Analog Devices about ways to extend capabilities of their ADM106x supply supervisor and sequencer chip. Link here (PDF) The ADM1062–ADM1069 Super Sequencers accurately monitor a number of input rails. The ADM1062–ADM1067 have 10 input pins dedicated to monitoring (VH, VP1 to VP4, VX1 to VX5) and the ADM1068 and ADM1069 have eight […]
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, […]