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Solutions Search - Sensor and Transducer Solutions

LTC2063 Micropower Precision Oxygen Sensor

Jul 27th 2017
This low power precision gas sensor circuit operates in an oxygen level range of 0% to 30%, with a nominal output of 1V in normal atmospheric oxygen concentrations (20.9%) when the gas sensor has been fully initialized. Total active power consumption is less than 2.1μA on a single rail supply. Since ...

Circuit LTspice 

 

LTC2063 RTD Sensor with ±1°C Precision

Jul 27th 2017
This low power platinum resistance temperature detector (RTD) sensor circuit draws only 35μA total supply current on a minimum 2.6V rail, and is accurate to within ±1°C at room temperature, including all error intrinsic to the Vishay PTS Class F0.3 Variant RTD. It covers the temperature ...

Circuit LTspice 

 

LTC6261 Audio Headphones Bridge Driver

May 22nd 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 ...

Circuit LTspice 

 

LTC2984 Thermocouple Measurement with Automatic Cold Junction Compensation

Jun 17th 2015
The LTC®2984 measures a wide variety of temperature sensors and digitally outputs the result, in °C or °F, with 0.1°C accuracy and 0.001°C resolution. The LTC2984 can measure the temperature of virtually all standard (type B, E, J, K, N, S, R, T) or custom thermocouples, automatically compensate for cold ...

Circuit 

 

LTC6269-10 20kΩ Gain 210MHz Transimpedance Amplifier

Apr 7th 2015
The LTC®6268-10/LTC6269-10 is a single/dual 4GHz FET-input operational amplifier with extremely low input bias current and low input capacitance. It also features low input-referred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, and high-impedance sensor amplifiers. It ...

Circuit 

 

LTC6268 20kΩ Gain 65MHz Trans-Impedance Amplifier

Apr 7th 2015
The LTC®6268/LTC6269 is a single/dual 500MHz FET-input operational amplifier with extremely low input bias current and low input capacitance. It also features low inputreferred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, CCD output buffers, and high-impedance sensor ...

Circuit 

 

LTC6752 Optical Receiver Circuit

Dec 16th 2014
The LTC6752, along with a high speed high performance FET input operational amplifier like the LTC6268, can be used to implement an optical receiver as shown above. The figure shows the output of the LTC6268 driving the –IN pin of the LTC6752-2, the +IN pin of the LTC6752-2, and the LTC6752 output. The photodiode is being ...

Circuit 

 

LTC2983 Thermocouple Measurement with Automatic Cold Junction Compensation

Nov 10th 2014
The LTC®2983 measures a wide variety of temperature sensors and digitally outputs the result, in °C or °F, with 0.1°C accuracy and 0.001°C resolution. The LTC2983 can measure the temperature of virtually all standard (type B, E, J, K, N, S, R, T) or custom thermocouples, automatically compensate for cold ...

Circuit 

 

LT6237 Low Power Avalanche Photodiode Transimpedance Amplifier IS = 3.3mA

Sep 25th 2014
The LT®6236/LT6237/LT6238 are single/dual/quad low noise, rail-to-rail output op amps that feature 1.1nV/√Hz input referred noise voltage density and draw only 3.5mA of supply current per amplifier. These amplifiers combine very low noise and supply current with a 215MHz gain bandwidth product and a 70V/μs slew ...

Circuit 

 

Product How-to: Precise Wireless Temperature Sensor Powers Itself

Jun 13th 2014
In case you missed it, LTC’s Kris Lokere recently wrote an article for EDN describing a circuit combining Dust, Energy Harvesting, and precision temperature sensing. Specifically, it describes a reference circuit showcasing: Dust Networks wireless - LTP5901-IPM SmartMesh IP Mote Energy Harvesting - LTC3330 Nanopower ...

Blog Post 

 

LTC2933 Low Cost Multipoint Temperature Control System

Apr 2nd 2014
The LTC®2933 is an EEPROM configurable voltage supervisor which can simultaneously monitor up to six power supply voltage inputs. Each voltage detector offers programmable over/undervoltage thresholds in various ranges and increments. ...

Circuit 

 

DC1956A - LT3905 Demo Board | Boost with APD Current Monitor, 2.7V ≤ VIN ≤ 12V, Vout = 50V @ 2mA

Feb 3rd 2014
Demonstration circuit 1956A features the LT®3905, a boost DC/DC Converter with APD current monitor that comes in a 3mm × 3mm QFN package. This demo board is designed to convert a 2.7V to 12V input to a 50V output at 2mA. The LT3905 is equipped with indicators for monitoring APD current, overload, and loss-of-signal ...

Demo Board LTspice 

 

LT3667 Pulsed Power Supply for 4mA to 20mA Current Loops

Feb 3rd 2014
The LT®3667 is a monolithic triple power supply composed of a 400mA buck switching regulator and two 200mA low dropout linear regulators (LDOs). ...

Circuit 

 

LT3905 Wide Output Range Constant Current APD Driver

Nov 7th 2013
The LT3905 is a fixed frequency current-mode step-up converter designed to bias avalanche photodiodes (APD) in optical receivers. The LT3905 features high side APD current monitoring over five decades of dynamic range with better than 2% relative accuracy over the 3μA to 3mA range. ...

Circuit 

 

LT3905 Adjustable APD Bias Supply

Nov 7th 2013
The LT3905 is a fixed frequency current-mode step-up converter designed to bias avalanche photodiodes (APD) in optical receivers. The LT3905 features high side APD current monitoring over five decades of dynamic range with better than 2% relative accuracy over the 3μA to 3mA range. ...

Circuit LTspice 

 

LTC3255 3.3V@7.4mA DC Supply from 4mA to 20mA Current Loop

Sep 16th 2013
The LTC3255 is a switched-capacitor step-down DC/DC converter that produces a regulated output (2.4V to 12.5V adjustable) from a 4V to 48V input. In applications where the input voltage exceeds twice the output voltage, 2:1 capacitive charge pumping extends output current capability beyond input supply current limits. At no ...

Circuit 

 

LTC3255 5V@7mA Supply from 4mA to 20mA Current Loop

Sep 16th 2013
The LTC3255 is a switched-capacitor step-down DC/DC converter that produces a regulated output (2.4V to 12.5V adjustable) from a 4V to 48V input. In applications where the input voltage exceeds twice the output voltage, 2:1 capacitive charge pumping extends output current capability beyond input supply current limits. At no ...

Circuit 

 

Low Noise Single Supply Photodiode Amplifier

Glen Brisebois - Applications Engineer - Signal Conditioning Feb 4th 2013
Low Noise Single Supply Photodiode Amplifier Figure 1 shows the LTC6252 applied as a high performance transimpedance amplifier for a photodiode. A low noise JFET acts as a current buffer, with R2 and R3 imposing a low frequency gain of approximately 1. Transimpedance gain is set by feedback resistor R1 to 1MΩ. R4 and ...

Blog Post 

 

Extended Dynamic Range 1MΩ Transimpedance Photodiode Amplifier

Oct 30th 2012
The LTC6090 is a high voltage precision operational amplifier. The low noise, low bias current input stage is ideal for high gain configurations. The LTC6090 has low input offset voltage, a rail-to-rail output stage, and can be run from a single 140V or split ±70V supplies. ...

Circuit 

 

System Monitor with Instrumentation-Grade Accuracy Used to Measure Relative Humidity

Aug 18th 2011
A psychrometer is a type of hygrometer, a device that measures relative humidity. It uses two thermometers, one dry (dry bulb) and one covered in a fabric saturated with distilled water (wet bulb). Air is passed over both thermometers, either by a fan or by swinging the instrument, as in a “sling psychrometer.” A psychrometric ...

Circuit 

 

Motor Protection/Regulation

Aug 18th 2011
The LTC2991 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the eight monitors can individually measure supply voltages and can be paired for differential measurements of current sense resistors or temperature sensing transistors. Additional measurements include internal temperature ...

Circuit 

 

Computer Voltage and Temperature Monitoring

Aug 18th 2011
The LTC2991 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the eight monitors can individually measure supply voltages and can be paired for differential measurements of current sense resistors or temperature sensing transistors. Additional measurements include internal temperature ...

Circuit 

 

DC1767A - LTC2997 | Internal/Remote Temperature Sensor

Aug 5th 2011
DC1767A - Demo Board for:LTC2997 - Remote/Internal Temperature Sensor ...

Demo Board LTspice 

 

Internal Temperature Sensor

Jul 7th 2011
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. ...

Circuit 

 

LTC2997 Temperature to Bits

Jul 7th 2011
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. ...

Circuit 

 

Remote CPU/ASIC/FPGA Temperature Sensor

Jul 7th 2011
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. ...

Circuit 

 

LTC3105 Industrial Sensor 4mA to 20mA Current Loop Power Tap

Oct 15th 2010
The LTC3105 is a high efficiency step-up DC/DC converter that can operate from input voltages as low as 225mV. A 250mV start-up capability and integrated maximum power point controller (MPPC) enable operation directly from low voltage, high impedance alternative power sources such as photovoltaic cells, TEGs (thermoelectric ...

Circuit 

 

Liquid-Level Indicator

Sep 3rd 2010
The LTC2990 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC. The internal 10ppm/°C reference minimizes the number of supporting ...

Circuit 

 

Motor Protection/Regulation

Sep 3rd 2010
The LTC2990 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC. The internal 10ppm/°C reference minimizes the number of supporting ...

Circuit 

 

Oscillator/Reference Oven Temperature Regulation

Sep 3rd 2010
The LTC2990 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC. The internal 10ppm/°C reference minimizes the number of supporting ...

Circuit 

 

Wet Bulb Psychrometer

Sep 3rd 2010
The LTC2990 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC. The internal 10ppm/°C reference minimizes the number of supporting ...

Circuit 

 

Wind Direction and Airflow Measurement

Sep 3rd 2010
The LTC2990 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC. The internal 10ppm/°C reference minimizes the number of supporting ...

Circuit 

 

LTC6990 Full Range Temperature to Frequency Converter. 16kHz to 1kHz from –20°C to 80°C

May 12th 2010
The LTC®6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz. It can be used as a fixed-frequency or voltage-controlled oscillator (VCO). The LTC6990 is part of the TimerBlox® family of versatile silicon timing devices. A single resistor, RSET, programs the LTC6990’s internal ...

Circuit 

 

Light to Frequency Converter

May 12th 2010
Fout = –1.4kHz per microampere of photo diode current, IPD. The LTC6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz. It can be used as a fixed-frequency or voltage-controlled oscillator (VCO). The LTC6990 is part of the TimerBlox family of versatile silicon timing devices. A single ...

Circuit 

 

Temperature to Frequency Converter

May 12th 2010
3% Linearity from –20°C (Fout = 20kHz) to 75°C (Fout = 25kHz) The LTC6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz. It can be used as a fixed-frequency or voltage-controlled oscillator (VCO). The LTC6990 is part of the TimerBlox family of versatile silicon timing devices. ...

Circuit 

 

Ratiometric Sensor to Pulse Width, Non-Inverting Response

May 12th 2010
The LTC6992 is a silicon oscillator with an easy-to-use analog voltage-controlled pulse width modulation (PWM) capability. The LTC6992 is part of the TimerBlox family of versatile silicon timing devices. A single resistor, RSET, programs the LTC6992’s internal master oscillator frequency. The output frequency is determined ...

Circuit 

 

700kHz, 1MΩ Single Supply Photodiode Amplifier

Oct 2nd 2009
The measured output noise for this circuit was 153uVrms measured on a 1MHz bandwidth. Supply current was a low 2.2mA. ...

Circuit 

 

2-Terminal Temperature-to-Current Thermometer Suitable for Use at the End of Long Wire Runs

Apr 22nd 2009
By adding the LT3092 to the thermistor kit along with three 0.1% accuracy resistors and one fi nal trim, a very accurate 2-terminal temperature-to-current converter can be built. This circuit measures 700μA operating current at 0°C, dropping by 2μA every degree until 100°C, at which point the current measures 500μA. The ...

Circuit 

 

2-Terminal Temperature-to-Current Thermometer Suitable for Use at the End of Long Wire Runs

Apr 22nd 2009
By adding the LT3092 to a thermistor kit along with three 0.1% accuracy resistors and one final trim, a very accurate 2-terminal temperature-to-current converter can be built. This circuit measures 700μA operating current at 0°C, dropping by 2μA every degree until 100°C, at which point the current measures 500μA. The obvious ...

Circuit 

 

5V to 69V Low Noise APD Bias Supply with Soft-Start

Jan 22nd 2009
The LT3571 is a current mode step-up DC/DC converter designed to bias avalanche photodiodes (APDs) in optical receivers with an output voltage up to 75V. The LT3571 features a high side fi xed voltage drop APD current monitor with better than 10% relative accuracy over the entire temperature range. The integrated power switch, ...

Circuit 

 

3.3V to 50V Low Noise APD Bias Power Supply

Jan 22nd 2009
The LT3571 is a current mode step-up DC/DC converter designed to bias avalanche photodiodes (APDs) in optical receivers with an output voltage up to 75V. The LT3571 features a high side fi xed voltage drop APD current monitor with better than 10% relative accuracy over the entire temperature range. The integrated power switch, ...

Circuit 

 

3.3V to 50V Low Noise APD Bias Supply With Ultrafast Current Monitor Transient Speed

Jan 22nd 2009
The LT3571 is a current mode step-up DC/DC converter designed to bias avalanche photodiodes (APDs) in optical receivers with an output voltage up to 75V. The LT3571 features a high side fixed voltage drop APD current monitor with better than 10% relative accuracy over the entire temperature range. The integrated power switch, ...

Circuit 

 

5V to 45V Low Noise APD Bias Power Supply

Jan 22nd 2009
The LT3571 is a current mode step-up DC/DC converter designed to bias avalanche photodiodes (APDs) in optical receivers with an output voltage up to 75V. The LT3571 features a high side fi xed voltage drop APD current monitor with better than 10% relative accuracy over the entire temperature range. The integrated power switch, ...

Circuit 

 

5V to 50V Low Noise APD Bias Power Supply with Temperature Compensation

Jan 22nd 2009
The LT3571 is a current mode step-up DC/DC converter designed to bias avalanche photodiodes (APDs) in optical receivers with an output voltage up to 75V. The LT3571 features a high side fixed voltage drop APD current monitor with better than 10% relative accuracy over the entire temperature range. The integrated power switch, ...

Circuit 

 

How To Build a Low Noise Power Supply for High Voltage (i.e. 100V up to 1000V) Transducers

Jim Williams - Applications Guru Sep 15th 2008
A Kilovolt with 100 Microvolts of Noise Photomultipliers (PMT), avalanche photodiodes (APD), ultrasonic transducers, capacitance microphones, radiation detectors and similar devices require high voltage, low current bias. Additionally, the high voltage must be pristinely free of noise; well under a millivolt is a common requirement ...

Video 

 

How To Make A Thermocouple Meter With The LTC2492

Mark Thoren - Staff Scientist Sep 15th 2008
This video explains how to use the 24-bit LTC2492 2-channel delta-sigma analog-to-digital converter with Easy Drive Input Current Cancellation to make thermocouple measurements. The ADCs features and benefits are discussed, as is cold junction compensation; this is followed by a lab demonstration of the LTC2492 thermocouple ...

Video 

 

Li-Ion Powered Supply for CCD Imager and Five White Backlight LEDs

Aug 18th 2008
The LT3587 provides a complete biasing solution for CCD (15V@50mA, -8V@100mA) and LED backlighting from a single Li-Ion cell ...

Circuit 

 

Complete Power Solution For Portable Cameras

Aug 18th 2008
The LT3587 and LT3586 can combine to provide all required supplies for a digital camera: 3.3V@1A for system I/O, 1.8V@400mA for memory, 1.6V@400mA for core supply, 5V@800mA for audio/motor drive, positive (15V@50mA) and negative (-8V@100mA) CCD imager bias and white LED backlighting ...

Circuit 

 

2 AA Cells Provide CCD Positive and Negative Supply and Three White LED Backlight LED Driver

Aug 18th 2008
The LT3587 provides a complete biasing solution for CCD (12V@10mA, -8V@20mA) and LED backlighting from 2 AA cells ...

Circuit 

 

Driver For CCD Imager and an OLED Display Panel With Soft Start

Aug 18th 2008
The three outputs of the LT3587 can be configured to provide positive (+15V@50mA) and negative (-8V@100mA) bias for a CCD imager as well as 16V@20mA to bias an OLED display ...

Circuit 

 

Temperature Monitoring with an NTC Thermistor While Measuring Load Current and LTC4151 Supply Current

Jan 25th 2008
The LTC4151 is a high side power monitor that operates over a wide voltage range of 7V to 80V. In default operation mode, the onboard 12-bit ADC continuously measures high side current, input voltage and an external voltage. Data is reported through the I2C interface when polled by a host. The LTC4151 can also perform on-demand ...

Circuit 

 

Single Supply Shock/Vibration Sensor Amplifier

Sep 5th 2007
The LTC6087/LTC6088 are dual/quad, low noise, low offset, rail-to-rail input/output, unity-gain stable CMOS operational amplifiers that feature 1pA of input bias current. A 14MHz gain bandwidth and 7.2V/μs slew rate, combined with low noise (10nV/√Hz) and a low 0.75mV offset, make the LTC6087/LTC6088 useful in a variety of ...

Circuit 

 

LTC6081 Single Supply Strain Gauge Amplifier

Aug 6th 2007
A dual CMOS amplifier with low supply voltage operation and rail to rail input and output performance makes single supply operation easy. This circuit provides a gain of 1001 to the small differential input signal from a low voltage strain gauge bridge transducer. High input impedance allows for high valued input resistors to ...

Circuit LTspice 

 

LTC6081 Shock Sensor Amplifier (Accelerometer)

Aug 6th 2007
A shock sensor is a capacitive piezoelectric element which generates a charge under physical acceleration. This charge can be converted to a voltage and filtered using high valued resistors and a high input impedance CMOS amplifier such as the LTC6081. This circuit has a gain of 100 and output 109mV per g of acceleration. ...

Circuit LTspice 

 

Single Ended To Differential Transimpedance Amplifier

Aug 3rd 2007
This circuit shows the LTC6406 connected as a single-ended transimpedance amplifier with 20kΩ of transimpedance gain. The BF862 JFET buffers the LTC6406 input, drastically reducing the effects of its bipolar input transistor current noise. The VGS of the JFET is now included as an offset, but this is typically 0.6V so ...

Circuit 

 

High Voltage/Current and Temperature Monitoring

Jun 15th 2007
The LTC2990 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC. The internal 10ppm/°C reference minimizes the number of supporting ...

Circuit 

 

5V to 85V Low Noise APD Bias Power Supply

Mar 12th 2007
The LT3482 is a fixed frequency current mode step-up DC/DC converter with voltage doubler designed to bias avalanche photodiodes (APDs) in optical receivers. It can provide up to 90V output. The LT3482 features high side APD current monitoring with better than 10% relative accuracy over the entire temperature range. The integrated ...

Circuit 

 

3.3V to 40V Low Noise APD Bias Power Supply

Mar 12th 2007
The LT3482 is a fixed frequency current mode step-up DC/DC converter with voltage doubler designed to bias avalanche photodiodes (APDs) in optical receivers. It can provide up to 90V output. The LT3482 features high side APD current monitoring with better than 10% relative accuracy over the entire temperature range. The integrated ...

Circuit 

 

5V to 45V Low Noise ADP Bias Topology with Fast Current Monitor Transient Response

Mar 12th 2007
The LT3482 is a fixed frequency current mode step-up DC/DC converter with voltage doubler designed to bias avalanche photodiodes (APDs) in optical receivers. It can provide up to 90V output. The LT3482 features high side APD current monitoring with better than 10% relative accuracy over the entire temperature range. The integrated ...

Circuit 

 

3.3V to 70V Low Noise APD Bias Power Supply with Fast Current Monitor Response

Mar 12th 2007
The LT3482 is a fixed frequency current mode step-up DC/DC converter with voltage doubler designed to bias avalanche photodiodes (APDs) in optical receivers. It can provide up to 90V output. The LT3482 features high side APD current monitoring with better than 10% relative accuracy over the entire temperature range. The integrated ...

Circuit 

 

LTC6240 Low Noise 1M Trans-Impedance Amplifier

Jan 10th 2007
By using a 10Megaohm resistor, with a noise of 400nV/rtHz, for transimpedance gain and then attenuating the signal by 10 results in an equivalent gain of 1Megaohm with only 40nV/rtHz of noise. This is less than 1/3 the noise of a single stage TIA with a 1Megaohm resistor. ...

Circuit 

 

LTC6240 Piezoelectric Shock Sensor Amplifier

Jan 10th 2007
A piezoelectric shock sensor generates a charge when physically accelerated. This charge is transferred to the smaller feedback capacitor. In this circuit a gain of 100 is given to the sensor’s open circuit voltage. ...

Circuit 

 

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. ...

Circuit 

 

Low Noise Low Power DC Accurate Single Supply Photodiode Amplifier

Sep 21st 2006
A low noise JFET Q1 acts as a current buffer, with R2 and R3 imposing a low frequency gain of approximately 1. ...

Circuit 

 

Small Area Photodiode in Normal TIA Configuration

Aug 22nd 2006
Small area photodiodes have low capacitance. To maintain low noise operation it is important to keep the input capacitance low so that the miniscule input noise current of the CMOS amplifier, and not the voltage noise, dominates the overall circuit noise. The total input capacitance from the amplifier in this circuit is the ...

Circuit 

 

Large Area Photodiode Bootstrapping

Aug 22nd 2006
Large area photodiodes come with a large capacitance, typically on the order of 3000pF or larger. This capacitance to ground at the input of a transimpedance amplifier has a significant effect on the output noise of the circuit as the noise gain increases dramatically at higher frequencies. The addition of a low noise JFET ...

Circuit 

 

LTC6244 Low Noise AC Difference Amplifier

Aug 22nd 2006
Piezoelectric and LVDT (Linear Variable Differential Transformer) sensors provide differential ac output signals. In addition to a standard difference amplifier a secend amplifier can be used as a dc servo amplifier to force an output dc bias potential in single supply applications. This difference amplifier is dc coupled but ...

Circuit LTspice 

 

Wide Bandwidth Photodiode Amplifier

Aug 22nd 2006
Wide bandwidth performance from a small photodiode requires minimizing the total input capacitance. In this circuit the amplifier's differential input capacitance is bootstrapped by the feedback with R1 and R2. Choosing the amplifier input that is at the corner of the package for the dual LTC6244 also minimizes pin-to-pin capacitance. ...

Circuit 

 

Very Low Noise Large Area Photodiode Amplifier

Aug 22nd 2006
Large area photodiodes come with a large capacitance, typically on the order of 3000pF or larger. This capacitance to ground at the input of a transimpedance amplifier has a significant effect on the output noise of the circuit as the noise gain increases dramatically at higher frequencies. AC coupling a bootstrap JFET across ...

Circuit 

 

+15V and -8V Low Vin (2.7V to 5V Vin) CCD Bias

May 3rd 2006
Postive (15V@40mA) and negative (-8V@80mA) bias voltages for a CCD imager can be generated from a 2.7V to 5V input supply by the LT3487 ...

Circuit 

 

+15V and -8V Boost and Inverting CCD Bias

May 3rd 2006
The dual boost/inverting LT3487 can provide both the positive (15V@45mA) and negative (-8V@90mA) bias voltages for a CCD imager ...

Circuit LTspice 

 

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. ...

Circuit 

 

LTC2485 Complete Type K Thermocouple Measurement System (I2C) with Cold Junction Compensation

Sep 6th 2005
The LTC2485 is ideal for direct digitization of thermocouples and other low voltage output sensors. The input has a typical offset error of 500nV (2.5μV max) offset drift of 10nV/°C and a noise level of 600nVRMS. The only signal conditioning is a simple surge protection network. In any thermocouple meter, the cold junction ...

Circuit 

 

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 ...

Circuit 

 

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. ...

Circuit 

 

Type K Thermocouple Signal Conditioner with ±190V Protection from Accidental Contact and Cold Junction Compensation

Aug 16th 2005
Thermocouple wires are intended to be electrically floating in order to detect temperature by producing the Seebeck voltage created by two dissimilar metals. This small voltage is amplified to an easily measurable level by an amplifier. To protect the input terminals of the amplifier in the event that the thermocouple is shorted ...

Circuit 

 

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. ...

Circuit 

 

0°C to 100°C Linear RTD Amplifier with 90°C Overtemperature Alarm

Aug 16th 2005
The LTC6078 is a dual, low offset, low noise operational amplifiers with low power consumption and rail-to-rail input/output swing. Input offset voltage is trimmed to less than 25μV and the CMOS inputs draw less than 50pA of bias current. The low offset drift, excellent CMRR, and high voltage gain make it a good choice for ...

Circuit 

 

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. ...

Circuit LTspice 

 

Low Noise Non-Inverting Shock Sensor Amplifier

Jun 27th 2005
The shock sensor charge is converted to a voltage and amplified with a precision resistor ratio for gain accuracy. Paralleling amplifiers reduces noise. ...

Circuit 

 

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