Digital driver provides higher resolution

24th February 2017
Source: PI
Posted By : Lanna Deamer
Digital driver provides higher resolution

 

The reference-class digital controller/driver offering higher bandwidth and resolution has been improved by PI, along with three times the driver power of its predecessor.

From the nanopositioning systems industry leader, the E-754 is designed for closed-loop piezo mechanisms with capacitive position feedback sensors.

22-bit resolution and 50kHz servo-bandwidth, digital linearisation
Several decades of knowledge and experience are built into the E-754 controller. It provides a fast servo with 50kHz update rate and 22-bit resolution. In addition to PID control, two programmable notch filters are integrated for higher bandwidth by suppression of mechanical system resonances. Digital linearisation is based on 4th order polynomials to suppress linearity deviation to less than 0.01%. The Dynamic Digital Linearisation (DDL) firmware option eliminates phase lag and dynamic non-linearities at high operating frequencies, such as used in scanning applications. The driver provides 500mA peak current and -30 to 135V output voltage swing.

Multiple interfaces, digital and analogue
In addition to Ethernet (TCP/IP), SPI, USB, RS-232 communication interfaces, 4 I/O trigger lines and a high-resolution, 20 bit DAC analogue command interface is also installed. A built-in high-speed data recorder allows capture of transients and optimisation of servo parameters.

Auto-Calibration ID chip for quick start-up and interchangeability of controller and mechanics, comprehensive software package
ID chip compatibility allows for quick start-up and interchangeability of controller and piezo mechanisms without recalibration, a critical feature for OEMs. The controller also comes with extensive software support for LabVIEW and shared libraries for Windows and Linux.

Applications of the E-754
Applications for the dynamic controller include nanopositioning, nano-automation, semiconductor technology, photonics, bio-nano technology, metrology, microscopy, micro-manipulation, including cleanroom applications.

Features and advantages

  • 50kHz servo loop
  • 22-bit DAC resolution
  • 20-bit analogue command interface
  • 45W peak power, 500mA peak current
  • USB, Ethernet (TCP/IP), SPI, RS-232 interfaces

Standard and custom
PI has over four decades of experience providing in-house engineered precision motion control solutions, and can quickly modify existing product designs or provide a fully customised OEM part to fit the exact requirements of the customer’s application.

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