Solutions Search - Low Power Amplifiers (Is < 1mA)
LTC6261 Second Order Bessel Filter
Jan 17th 2017
The LTC®6261/LTC6262/LTC6263 are single/dual/quad operational amplifiers with low noise, low power, low supply voltage, and rail-to-rail inputs and outputs. They are unity gain stable with capacitive loads up to 1nF. They feature 30MHz gain-bandwidth product, 7V/μs slew rate while consuming only 240μA of supply current ...
LTC6261 Third Order Butterworth Filter
Jan 17th 2017
The LTC®6261/LTC6262/LTC6263 are single/dual/quad operational amplifiers with low noise, low power, low supply voltage, and rail-to-rail inputs and outputs. They are unity gain stable with capacitive loads up to 1nF. They feature 30MHz gain-bandwidth product, 7V/μs slew rate while consuming only 240μA of supply current ...
Hybrid Wide Dimming Ratio Linear LED Current Controller Using LT8614 & LT3083/LT6015
Oct 17th 2016
Many applications for LED illumination require wide dimming ratios. This can be accomplished simply via an adjustable current source as show below. The current source can be varied by a number of different means, and a large LED current range can be achieved. The primary problem with this technique is that the power dissipation ...
Op Amp Precision Positive & Negative Clipper using LT6015/LT6016/LT6017
Oct 3rd 2016
It can be a challenge to match the voltage range of an analog signal to the input range of an analog to digital converter (ADC). Exceeding the ADC’s input range will give an incorrect reading, and if the input goes far enough beyond the power supply rails substrate currents can flow into the ADC which can cause latch up ...
High Accuracy, μPower, Over-Voltage Detector with Glitch Suppressor Using LTC1541 and LTC6994
May 4th 2016
An overvoltage detector which suppresses glitches is constructed from the LTC®1541 micropower op amp + comparator + voltage reference and LTC6994-1 TimerBlox® delay block/debouncer. In this circuit, the LTC1541 comparator detects power rail overvoltage conditions (including glitches). The built-in op amp inverts this ...
Positive to Negative Converter with Variable Output Using LTC3630 and LT6015/LT6016
Sep 1st 2015
There was a window of time in the 1950s and early ’60s when negative voltage rails were commonplace, when germanium PNP transistors were prevalent—like those used in an old “transistor radio”, now worth a fortune on Ebay. Nowadays, NPN transistors are more prevalent, since they basically work ...
LTC6363 LTC6363 Used as Lowpass Filter/Driver with 10VP-P Singled-Ended Input, Driving a SAR ADC
Aug 31st 2015
The LTC®6363 is a low power, low noise, fully differential op amp with rail-to-rail outputs optimized to drive low power SAR ADCs. The LTC6363 draws only 1.9mA supply current in active operation and features a shutdown mode which reduces the current consumption to 20μA (VS = 3V). ...
LTC6363 Differential AV = 1/9 Configuration Using an LT®5400 Quad-Matched Resistor Network
Aug 31st 2015
The LTC®6363 is a low power, low noise, fully differential op amp with rail-to-rail outputs optimized to drive low power SAR ADCs. The LTC6363 draws only 1.9mA supply current in active operation and features a shutdown mode which reduces the current consumption to 20μA (VS = 3V). ...
LTC6363 Single-Ended-to-Differential Conversion of a 20VP-P Ground-Referenced Input with Gain of AV = 0.5 to Drive an ADC
Aug 31st 2015
The LTC®6363 is a low power, low noise, fully differential op amp with rail-to-rail outputs optimized to drive low power SAR ADCs. The LTC6363 draws only 1.9mA supply current in active operation and features a shutdown mode which reduces the current consumption to 20μA (VS = 3V). ...
LT6023 Gain of 11 Instrumentation Amplifier
Jun 17th 2015
The LT®6023 is a low power, enhanced slew rate, precision operational amplifier. The proprietary circuit topology of this amplifier gives excellent slew rate at low quiescent power dissipation without compromising precision or settling time. In addition, proprietary input stage circuitry allows the input impedance to remain ...
LTC2644 An Opto-Isolated, PWM Regulated 4mA to 20mA Process Controller
Aug 4th 2014
The LTC®2644 is a family of dual 12-, 10-, and 8-bit PWMto- voltage output DACs with an integrated high accuracy, low drift, 10ppm/°C reference in a 12-lead MSOP package. It has rail-to-rail output buffers and is guaranteed monotonic. ...
LT6015 Gain of 100 High Voltage Difference Amplifier with –5V/75V Common Mode Range
Jun 20th 2013
The LT®6015/LT6016/LT6017 are single/dual/quad rail-torail input operational amplifiers with input offset voltage trimmed to less than 50μV. These amplifiers operate on single and split supplies with a total voltage of 3V to 50V and draw only 315μA per amplifier. They are reverse battery protected, drawing very little ...
LT6016 Extended Supply Current Boosted Gain of Three Amplifier Drives 100Ω Load to ±30V, with 600mA Current Limit
Nov 5th 2012
The LT®6015/LT6016/LT6017 are single/dual/quad rail-torail input operational amplifiers with input offset voltage trimmed to less than 50μV. These amplifiers operate on single and split supplies with a total voltage of 3V to 50V and draw only 315μA per amplifier. They are reverse battery protected, drawing very little ...
LT6016: Precision High Voltage High Side Load Current Monitor
Nov 5th 2012
The LT6016/LT6017 are dual and quad rail-to-rail input operational amplifiers with input offset voltage trimmed to less than 50μV. These amplifiers operate on single and split supplies with a total voltage of 3V to 50V and draw only 315μA per amplifier. The Over-The-Top input stage of the LT6016/LT6017 is designed to ...
LT6016 Wide Input Range Current Sense Amp Goes Hi-Z When VSUPPLY Removed
Nov 5th 2012
The LT®6015/LT6016/LT6017 are single/dual/quad rail-torail input operational amplifiers with input offset voltage trimmed to less than 50μV. These amplifiers operate on single and split supplies with a total voltage of 3V to 50V and draw only 315μA per amplifier. They are reverse battery protected, drawing very little ...
1.8V, 140uA, 100kHz, Lowpass Filter (Single-Ended Input and Differential Output)
Jun 10th 2010
The LTC6256 circuit shown here is a 2nd order, 100kHz, Butterworth lowpass filter. The filter’s differential
output maximizes the dynamic range in very low voltage
operation.
The LTC6255/LTC6256/LTC6257 are single/dual/quad operational amplifiers with low noise, low power, low supply voltage, rail-to-rail input/output. ...
LT2940 1-Cell Monitor with Bottom-Side Sense
Nov 30th 2009
The LT2940 measures a high side current and a differential voltage, multiplies them and outputs a current proportional to instantaneous power. Bidirectional high side currents and bipolar voltage differences are correctly handled by the four-quadrant multiplier and push-pull output stage, which allows the LT2940 to indicate ...
LT2940 Adjustable 0W to 10W Load Box with UVLO and Thermal Shutdown
Nov 30th 2009
The LT2940 measures a high side current and a differential voltage, multiplies them and outputs a current proportional to instantaneous power. Bidirectional high side currents and bipolar voltage differences are correctly handled by the four-quadrant multiplier and push-pull output stage, which allows the LT2940 to indicate ...
Single 2.7V Supply 4MHz 4th Order Lowpass Butterworth Filter
Oct 2nd 2009
Benefiting from low voltage operation and rail-to-rail output, a low power filter that is suitable for antialiasing can be built as shown in this circuit. On a 2.7V supply the filter has a passband of approximately 4MHz with 2VP-P input signal and a stopband attenuation that is greater than –75dB at 43MHz. The resistor and ...
Micro Power Oxygen Sensor
Sep 21st 2006
Micro Power Oxygen Sensor takes advantage of low and clean startup current characteristics and wide supply voltage range, 1.8V to 16V range. ...
High Accuracy Oxygen Sensor
Nov 17th 2005
High Accuracy Oxygen Sensor. Accuracy is achieved using a transimpedance approach. Reduction in noise gain gives a reduction in output offset error from 50mv to 500µa. ...
LTC6078 60Hz Notch Filter
Aug 16th 2005
High input impedance amplifiers are ideal for buffering high impedance networks. Here a twin-T notch filter is shown to reject 60Hz signal content by more the 60dB. Small size, low valued capacitors can be used at such a low frequency with high valued resistors when using a CMOS op amp. ...
2.7V to 5.5V Precision High Side Current Sense
Aug 16th 2005
This high side current sense amplifier works down to 2.7V. Even with such a low supply voltage, accuracy of the voltage sensed across resistor Rs is preserved due to the very low voltage offset error of the LTC6078 amplifier (7uV typical).
...
LTC6078 pH Probe Amplifier
Aug 16th 2005
pH Probe amplifiers require buffer amplifiers with an input impedance greater than 10^13 ohms. Without loading the probe, an output of approximately 60mV/pH unit is produce. The thermistor is added to provide first order compensation for the inherent temperature coefficient of the pH probe output. ...
Thermocouple Thermometer with Cold Junction Compensation
Aug 16th 2005
The LTC2997 is a high-accuracy analog output temperature sensor. It converts the temperature of an external sensor or its own temperature to an analog voltage output. A built-in algorithm eliminates errors due to series resistance between the LTC2997 and the sensor diode. ...
Reduced Power Infra-Red Diode Driver
Aug 16th 2005
Infra-Red LEDs can be used as continuously operating beams of light. Sensing a break in the path of light between the source and a photodiode receiver is often used in safety and alarm systems. To extend the run-time of the light source, the diode conducts the minimum current necessary, in this case 10mA. Controlling the duty ...
Accelerometer Signal Conditioner
Aug 16th 2005
A piezoelectric accelerometer responds to any physical movement by generating a charge proportional to the acceleration of the movement. This sensor has a capacitance of 750pF which produces a charge of 60pC per g of gravitational force. This charge is transferred to the 1000pF feedback capacitor for an output of 60mV/g.
...
Micropower Photodiode Amplifier
Aug 16th 2005
This is a basic photodiode amplifier which converts the tiny current output by the diode in response to light intensity to a buffered low impedance voltage source. CMOS amplifier's allow for the use of large feedback resistors and add very little input bias error current. For this Infra-Red diode the output changes 600mV for ...
Precision Sample and Hold Amplifier
Sep 3rd 2004
CMOS amplifiers are very good for use in Sample-and-Hold circuits because the pA's of bias current does not drain off charge held on the hold capacitor. A dual amplifier can be used to buffer the input signal and also the hold capacitor. The slew rate of the circuit is limited by the output current limit of the input amplifier ...
Hall Sensor Amplifier Optimizes Sensitivity vs Supply Current
Mar 1st 2004
Voltage across HALL-ELEMENT bridge is reduced to minimize bridge current from 2.5mA or 230µA then a dual LT6011 DC precision low current low drift and Vos OP AMP is used in an instrumentation AMP configuration at a gain of 101 to give a sensitivity of 40mV/mT. ...
Simple Bidirectional DC Motor Speed Controller Without a Tachometer
Feb 13th 2001
For motor speed control without using a tachometer, the
circuit in Figure 12 shows an approach. Using the enable feature of the LT1970A, the drive to the motor can be
removed periodically. With no drive applied, the spinning
motor presents a back EMF voltage proportional to its
rotational speed. The LT1782 is a tiny rail-to-rail ...
Micropower Integrating Current Sense
Jan 31st 2001
This circuit takes advantage of the microampere supply current and Rail-to-Rail input of the LT1494. Supply current is only 3uA during integration and 5uA at the end of integration. ...
Self-Powered High Side Current Sense
Jan 31st 2001
This circuit takes advantage of the microampere supply current and Rail-to-Rail input of the LT1494. The circuit is simple because the supply draw is essentially equal to the load current developed through RA. This supply current is simply passed through RB to form an output voltage that is appropriately amplified. ...
13uA, 0kHz to 10kHz Voltage to Frequency Converter
Jan 22nd 1997
This circuit converts a 0V to 2.5V input signal to a 0kHz to 10kHz output frequency. The supply current of the circuit is only 6.2uA quiescent and 13.3uA at f=10kHz. The linearity of the circuit is +/-0.03%. PSRR is 10ppm/V and temperature drift is 250ppm/C. ...
Battery Powered (Li-Ion) Platinum RTD Signal Conditioner with Curvature Correction
Nov 26th 1996
The LT2078 is a micropower dual op amp in 8-pin small outline, standard surface mount package, and LT2079 is a micropower quad op amp offered in the standard 14-pin surface mount package. Both devices are optimized for single supply operation at 5V. ±15V specifications are also provided.
...
DAC Reference Inverter and I-to-V Converter
Aug 23rd 1995
LT6011 dual op amp performs two functions - inverting a positive ref voltage to a negative ref voltage to allow bipolar output polarities and performing the current to voltage conversion on the DAC's current outputs as well buffering the outputs. ...
LT1963A Paralleling of Regulators for Higher Output Current
Oct 6th 1994
The LT®1963A series are low dropout regulators optimized for fast transient response. The devices are capable of supplying 1.5A of output current with a dropout voltage of 340mV. Operating quiescent current is 1mA, dropping to <1μA in shutdown. Quiescent current is well controlled; it does not rise in dropout as ...
LT1963A Adjustable Current Source
Oct 6th 1994
The LT®1963A series are low dropout regulators optimized for fast transient response. The devices are capable of supplying 1.5A of output current with a dropout voltage of 340mV. Operating quiescent current is 1mA, dropping to <1μA in shutdown. Quiescent current is well controlled; it does not rise in dropout as ...
DC Accurate Composite Amplifier
Apr 1st 1992
Most individual op amp devices are optimized for either DC precision or for high speed operation. A composite amplifier configuration uses a precision low offset and drift amplifier to control the dc biasing of a high speed amplifier. This circuit has a gain bandwidth product of 1.25MHz yet an input offset voltage of only 25uV ...
LT6020 ±13.6V Input Range MUX Buffer
Sep 1st 1991
The LT6020 is a low power, enhanced slew rate, precision operational amplifier. The proprietary circuit topology of this amplifier gives excellent slew rate at low quiescent power dissipation without compromising precision or settling time. In addition, unique input stage circuitry allows the input impedance to remain high ...
Programmable Gain Amplifier (Single Supply)
Jan 1st 1987
The CMOS switch selects which feedback node is used, thus setting the loop gain to different levels as desired. The advantage of this circuit is that the capacitance and leakage effects are isolated from the feedback resistors so accuracy is maintained. The deselected opamp sections saturate, but remain well behaved with the ...
Micropower Multiplier/Divide
Jan 1st 1987
The X, Y, and Z input amplifiers servo to control the emitter current of transistors according to the applied signals. The transistors Vbe varies logarithmically to the current and so the emitter of Q2 includes the sum of the X and Y logs. The Z signal log is provided at the Q4 base so the resultant Vbe at Q4 is Vbe1+Vbe2-Vbe3. ...
Megaohm Input Impedance Gain of 10 Difference Amplifier
Jan 1st 1987
THE USEFULNESS OF DIFFERENCE AMPLIFIERS IS LIMITED BY THE FACT THAT THE INPUT RESISTANCE IS EQUAL TO THE SOURCE RESISTANCE. THE PICO-AMPERE OFFSET CURRENT AND LOW CURRENT NOISE OF THE LT1077 ALLOWS THE USE OF 1M SOURCE RESISTORS WITHOUT DEGRADATION IN PERFORMANCE. IN ADDITION, WITH MEGAOHM RESISTORS MICROPOWER OPERATION CAN ...
Lead-Acid Low-Battery Detector with System Shutdown
Jan 1st 1987
Resistor dividers are used to provide a signal comparison against a reference voltage. The opamps operate as precision comparators to provide indications of battery charge state. ...
Two Terminal Current Source
Jan 1st 1987
The opamp buffers the upper potential of a shunt regulator to set a voltage drop on R1 equal to the reference. The net current to RL is the programmed R1 current plus the quiescent supply current of the opamp passing through the reference. ...
LT1078 Absolute Value Circuit (Full-Wave Rectifier)
Jan 1st 1987
For negative inputs, the first section operates as a closed-loop inverter (A=-1) and the second stage is simply a buffer for the positive output. When the input signal is positive, the first opamp output remains saturated near ground and the diode becomes high-impedance, allowing the signal to pass directly to the buffer stage ...
Single Supply, Micropower, Second Order Lowpass Filter with 60Hz Notch
Jan 1st 1987
The first section is a standard low-pass filter with Fc=40Hz. The second section is a notch filter tuned to eliminate 60Hz mains pickup from the signal. ...
Micropower Dead Zone Generator
Jan 1st 1987
Opamp in lower left functions as a polarity detect comparator, controlling the FET switches in the circuit. The upper left stage in conjunction with the FET, functions as an absolute value circuit so that only positive signal representation passes to the dead-zone function. Q2 is held in cutoff by the control voltage on Q3, ...
±250V Common Mode Range Difference Amplifier (AV = 1)
Jan 1st 1987
This is a modified difference amplifier- it has effectively added resistances from each input to ground to attenuate the common mode signal. This allows the wide input range without exceeding the Vcm of the opamp. ...
Platinum RTD Signal Conditioner with Curvature Correction
Jan 1st 1987
The left stage forms a stable precision current source by establishing the reference voltage across a precision resistor, and about half of this current passes through the sensor. The right opamp provides an amplification of the resistance difference between the sensor and a fixed precision resistor to generate a temperature ...
Half-Wave Rectifier
Jan 1st 1987
This is a conventional inverting amplifier, but with a single supply the output can only provide the positive side of the result. The specific characteristics of the opamp provide well controlled clipping behavior. ...
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