DC746A Analog Devices

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 746 2 CHANNEL, 24-BIT DIFFERENTIAL INPUT DELTA SIGMA ADC LTC2412 DESCRIPTION Demonstration circuit 746 features the LTC2412, a 2 analog signals while using the DC590 USB Serial channel, 24-bit high performance DS analog-to- Controller board and supplied software to measure digital converter (ADC). The LTC2412 features 2ppm performance. The exposed ground planes allow linearity, 2.5ppm full-scale accuracy, 0.1ppm offset, proper grounding to prototype circuitry. After evaluat- and 0.16ppm noise. The inputs and reference are fully ing with Linear Technologys software, the digital sig- differential, with input common mode rejection of 140 nals can be connected to the end applications proc- dB. The LTC2412 is available in a 16 pin GN package essor / controller for development of the serial inter- and has an easy to use SPI interface. face. DC746 is a member of Linear Technologys QuickEval family of demonstration boards. It is de- Design files for this circuit board are available. Call signed to allow easy evaluation of the LTC2412 and the LTC factory. may be connected directly to the target applications 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 746 2 CHANNEL, 24-BIT DIFFERENTIAL INPUT DELTA SIGMA ADC the COLLECT button to start reading the input volt- age. Details on software features are documented in QUICK START PROCEDURE the control panels help menu. Connect DC746 to a DC590 USB Serial Controller Tools are available for logging data, changing refer- using the supplied 14 conductor ribbon cable. Con- ence voltage, changing the number of points in the nect DC590 to a host PC with a standard USB A/B strip chart and histogram, and changing the num- cable. Run the evaluation software supplied with ber of points averaged for the DVM display. DC590 or downloaded from www.linear.com. The correct program will be loaded automatically. Click 2