SIGNAL CONDITIONING PRODUCTS
SENSOR SIGNAL CONDITIONER WITH 0V-TO-5V RATIOMETRIC OUTPUT
The Texas Instruments PGA302 is a low-drift, low-noise, programmable signal-conditioner device designed for a variety of resistive bridge-sensing applications like pressure-, temperature-, and level-sensing applications. The PGA302 can also support flow metering applications, weight scale and force-sensing applications that use strain gauge load cells, and other general resistive bridge signal- conditioning applications. The PGA302 provides a bridge excitation
voltage of 2.5V and a current output source with programmable current output up to 1mA. At the input, the device contains two identical analogue front-end (AFE) channels followed by a 16-bit Sigma-Delta ADC. Each AFE channel has a dedicated
programmable gain amplifier with gain up to 200 V/V. Also, one of the channels integrates a sensor offset compensation function while the other channel integrates an internal temperature sensor. At the output of the device, a 1.25V, 14-bit
DAC is followed by a ratiometric-voltage supply output buffer with gain of 4V/V allowing a 0- 5V ratiometric voltage system output. The PGA302 device implements a third-order temperature coefficient (TC) and non-linearity (NL) digital compensation algorithm to calibrate the analogue output signal. All required parameters for the linearisation
algorithm as well as other user data is stored in the integrated EEPROM memory. For system connectivity the PGA302 device
integrates an I2C Interface as well as a one-wire interface (OWI) that supports communication and configuration through the power-supply line during final system calibration process. Diagnostics are implemented at the excitation output sources, the input to the AFE and the power supplies in the device. System Diagnostics like sensor open/short are also supported. PGA302 accommodates various sensing element
types, such as piezoresistive, ceramic film, strain gauge, and steel membrane. The device can also be used in accelerometer, humidity sensor signal- conditioning applications, as well as in some current-sensing, shunt-based applications.
Texas Instruments
www.ti.com VARIABLE GAIN CURRENT AMPLIFIER
FEMTO offers the ultra low noise variable gain current amplifier DDPCA-300 for sensitive current and charge measurements. The DDPCA-300 has a switchable gain from 104 to 1,013V/A. It has a low noise input of 0.4fA/√Hz minimum allowing measurement of currents in the femto to pico Ampere range. It also has a dynamic range of 240dB. Features include adjustable voltage directly on amplifier input for DUT biasing, DC optimised design with high stability and very low drift and manual control and remote interface. It comes in aluminum housing which is designed to optimise EMI shielding. The small size lets you get the amplifier close to the detector, minimising noise from long detector leads. Typical applications include spectroscopy,
photodiode amplification, sensitive ionisation and charge detector amplification, conductive atomic force microscopy (cAFM), characterisation of MOS and JFET structures, quantum and biotech experiments, and pre- amplification for oscilloscopes, A/D converters and digital voltmeters. The FEMTO line of amplifiers are sold by Electro Optical Components.
Electro Optical Components
www.eoc-inc.com
Rugged Established Controllers and Electrodes
Liquid Point Level Control
81 Series Noflote Range - Conductivity Based
Newly Designed Controllers
81NC Controllers 2A/5A Relays
Full Stainless Steel Construction
Single
BM906 and BD906 DIN Rail Mounting AC or DC powered
Multiple
Options include: Fixed / Variable Time Delay Latching Relay
Lee-Dickens Ltd, Rushton Road, Desborough, Kettering, Northants, NN14 2QW, UK Tel: 01536-760156 • Fax: 01536-762552 •
sales@lee-dickens.co.uk •
www.lee-dickens.co.uk
Certificate Number FM29298 / INSTRUMENTATION INSTRUMENTATION | DECEMBER/JANUARY 2018 27
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