Instrumentation Amplifier has digital gain control.
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Press Release Summary:
Housed in SSOP-16 or DFN12 package, LTC6915 features 14 levels of digitally controllable gain that can be set up to 4096 V/V via parallel or serial SPI(TM) interface. Gain drift of 1 ppm/°C is made possible via use of thin film resistor technology, making product insensitive to temperature changes. Based on zero-drift topology, product offers on-the-fly programmability, common mode rejection ratio of 125 dB, and rail-to-rail input/output swing.
Original Press Release:
The Most Precise Rail-to-Rail Input/Output Instrumentation Amp Has Digital Gain Control from 1 to 4096V/V
MILPITAS, CA - May 19, 2004 - Linear Technology Corporation introduces the LTC6915, the industry's most precise instrumentation amplifier that features digitally controllable gain. The user programmable gain can be set to 0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, or 4096V/V via a parallel or serial SPI(TM) interface. The wide gain range is associated with unparalleled accuracy over time and temperature. The immeasurable gain drift of 1ppm/°C is made possible with the use of state of the art thin film resistor technology. This results in a product that is insensitive to temperature changes and performs precision sensor amplification.
"The LTC6915's on-the-fly programmability gives designers the ability to accurately convert low level differential or single-ended sensor outputs to a well-defined voltage with extreme ease," said design manager, Nello Sevastopoulos. "Unlike complex gain setting procedures associated with alternative products, the LTC6915's gain selection is as easy as sending a 4-bit digital code through the user's choice of a parallel or serial interface. Offering utmost design flexibility, this highly accurate instrumentation amplifier gives designers a turnkey solution for conditioning a wide variety of sensors, ensuring stable output reading over a broad temperature range."
Based on the zero-drift topology, the LTC6915 features unrivaled DC accuracy. The 10uV maximum offset voltage, the miniscule 50nV/°C offset drift and the very high common mode rejection ratio of 125dB, which is gain independent, results in high DC precision. This high level of performance is achieved on an exceptionally low supply current of 1.65mA max. The LTC6915's differential inputs operate from rail-to-rail and the output swings from rail-to-rail maximizing dynamic range and minimizing supply voltages. The wide supply range of 2.7V to 11V allows use in single and dual supply applications.
The LTC6915 is ideal for use as a transducer interface in a variety of bridge circuits. Applications range from simple temperature or pressure sensing to sophisticated signal conditioning modules and data acquisition boards for use in industrial and process control, medical instruments, automotive, and communications.
The LTC6915 is available in two packages: a compact 16-pin SSOP and a tiny 3mm x 4mm leadless DFN package that reduces board space requirements. Specified for operation over the commercial, industrial and automotive temperature ranges, pricing starts at $3.95 each in 1,000-piece quantities.
Summary of Features: LTC6915
14 Levels of Programmable Gain
125dB CMRR Independent of Gain
Gain Accuracy:
0.075% Max, G=1
0.6 % Max, G= 64 to 1024
Input Offset Voltage: 10uV Max
Offset Voltage Drift: 0.05uV/°C Max
Rail-to-Rail Input/Output Swing
Parallel or Serial (SPI) Interface for Gain Setting
Operates with Single or Split Supplies: 2.7V to ±5.5V
Low Noise: 2.5uVP-P (0.01Hz to 10Hz)
SSOP-16 or DFN12 Package
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.
Note: LT, LTC and are registered trademarks of Linear Technology Corp.
