Tag Archives: OPAMP

Universal OpAmp Evaluation Board Using LMV321

The Universal Op-Amp Development board is a general purpose blank circuit board that simplify prototyping circuits for a variety of Op-Amp circuits. The evaluation module board design allows many different circuits to be constructed easily and quickly. This board supports single SOT23-5 package. Universal single Operational Amplifier (Op-Amp) board is designed to aid in the evaluation and testing of the low voltage/low power and some precision operational amplifiers.

Universal OpAmp Evaluation Board Using LMV321 – [Link]

Micropower, Rail-to-Rail, 300kHz Op Amp with Shutdown in tiny package

Op Amp Consumes Only 4.5µA and Offers 300kHz BW in 0.73mm x 1.07mm WLP and SOT-23 package.

The MAX40006 op amp features a maximized ratio of gain bandwidth (GBW) to supply current and is ideal for battery-powered applications such as handsets, tablets, notebooks, and portable medical equipment. This CMOS op amp features an ultra-low input-bias current of 1pA, rail-to-rail input and output, low supply current of 4.5µA, and operates from a single 1.7V to 5.5V supply.

Micropower, Rail-to-Rail, 300kHz Op Amp with Shutdown in tiny package – [Link]

LTC2063 – 2μA Supply Current, Zero-Drift Operational Amplifier

The LTC2063 is a single low power, zero-drift, 20kHz amplifier. The LTC2063 enables high resolution measurement at extremely low power levels. Typical supply current is 1.4μA with a maximum of 2μA. The available shutdown mode has been optimized to minimize power consumption in duty-cycled applications and features low charge loss during power-up, reducing total system power.

The LTC2063’s self-calibrating circuitry results in very low input offset (5μV max) and offset drift (0.02μV/°C). The maximum input bias current is only 20pA and does not exceed 100pA over the full specified temperature range. With its ultralow quiescent current and outstanding precision, the LTC2063 can serve as a signal chain building block in portable, energy harvesting and wireless sensor applications.

LTC2063 – 2μA Supply Current, Zero-Drift Operational Amplifier – [Link]

TI claims first for zero-drift, zero-crossover op amp: precision & linearity

by Graham Prophet @ edn-europe.com:

With precision and high input linearity in a single high-performance device, Texas Instruments says it has the first operational amplifier (op amp) to offer both zero-drift and zero-crossover technology. The OPA388 op amp maintains high precision across the entire input range for a variety of industrial applications, including test and measurement, medical and safety equipment, and high-resolution data-acquisition systems.

TI claims first for zero-drift, zero-crossover op amp: precision & linearity – [Link]

Constant Current Laser Diode Driver Circuit Using OPA2350 OpAmp

The voltage-controlled current source circuit can be used to drive a constant current into a signal or pump laser diode. This simple linear driver provides a cleaner drive current into a laser diode than switching PWM drivers. The basic circuit is that of a Howland current pump with a current booster (Q1) on the output of a R-R CMOS OPA2350 op amp (U1). Laser diode current is sensed by differentially measuring the voltage drop across a shunt resistor (RSHUNT) in series with the laser diode. The output current is controlled by the input voltage (VIN) that comes from Trim pot PR1.

Features

  • Supply 3,3V DC
  • Load Up to 300mA
  • PR1 Trimpot Current Adjust

Constant Current Laser Diode Driver Circuit Using OPA2350 OpAmp – [Link]

RELATED POSTS

DIY ECG with 1 op-amp

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A DIY ECG made from single op-amp (LM741) and 5 resistors by Scott Harden:

I made surprisingly good ECG from a single op-amp and 5 resistors! An ECG (electrocardiograph, sometimes called EKG) is a graph of the electrical potential your heart produces as it beats. Seven years ago I posted DIY ECG Machine on the Cheap which showed a discernible ECG I obtained using an op-amp, two resistors, and a capacitor outputting to a PC sound card’s microphone input.

DIY ECG with 1 op-amp – [Link]

Sensing current on the high side

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Michael Dunn@ edn.com discuss about current sense on the high side of power source.

At their heart, the majority of DC current sense circuits start with a resistance in a supply line (though magnetic field sensing is a good alternative, especially in higher-current scenarios). One simply measures the voltage drop across the resistor and scales it as desired to read current (E = I × R (if I didn’t include this, someone would complain)). If the sense resistor is in the ground leg, then the solution is a simple op-amp circuit. Everything stays referenced to ground, and you only have to be careful about small voltage drops in the ground layout.

Sensing current on the high side – [Link]

Lux Meter Module

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LUX Meter project has been design to measure the illumination. Illumination is luminous flux falling on surface area of photo diode. This illumination converted to corresponding voltage using Op-Amp circuit.

Specifications

  • Supply 9 VDC PP3 Battery @ 20 mA
  • Onboard Photo Diode
  • Onboard preset for calibration
  • Range selection via jumper 10mV/LUX, 1mV/LUX, 0.1mV/LUX
  • Interfacing is via berg connector
  • Power-On LED indicator
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 53 mm x 38 mm

Lux Meter Module – [Link]

Increasing cable length in precision video applications

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Maurizio tipped us about his latest article. In this article he talks about the different ways of transmitting video signal over large distances. He writes:

Traditionally, the physical environment for transmitting video signals over long distances has been the shielded coax cable. Its quality and advantages are well known, and many times designers looking for off-the-shelf solutions do not know that long distance video transmission can be achieved with the same quality but for a much lower price.

Increasing cable length in precision video applications – [Link]