An Industry First
2014 R&D 100 Winner
Texas Instrument’s LDC1000 is the industry’s first inductance-to-digital converter (LDC), providing electronics system designers with a new platform for developing breakthrough solutions to difficult system problems. The LDC1000 design team combined unique circuit and architecture topologies to create the product. Optimized by mixing current and voltage mode signaling to maximize the performance of the circuit, the LDC provides both high bandwidth and low power.
The key innovation of the LDC1000 was to combine high-performance eddy current losses and system inductance measurement capabilities in a small integrated circuit at low power using a patent-pending approach. The device includes a unique common-mode regulation loop to regulate the common-mode signal across the tank. As a result, the LDC1000 doesn’t need to incorporate complex common-mode filtering, which would consume significant power.
In order to combine the benefit of modern high-density CMOS technology with inductive sensing, the LDC team also implemented special tricks to overcome the limited impedance and signal swing of CMOS. Thanks to these advancements, the LDC1000 provides 16-bit eddy current losses and 24-bit inductance values, enabling sub-micrometer resolution in precision position sensing applications while consuming less than 8.5 mW of power during standard operation and less than 1.25 mW in standby mode.
|Texas Instruments' LDC1000 development team L-r): Scott Kulchycki, George Reitsma, Jonathan Baldwin, Karthikeyan Venkatachalam, Michael Stout, John Dell, Dan D'Aquino, Sumant Bapat, Eugene Quan, Freddy Mendoza, Frederick Paclibon and Dave Przbyla.|
The LDC1000 Development Team from Texas Instruments
Preeti Rajendran, Principal Developer
Servando Aguilar Jr.
Sampath Kumar Raman