DC570A Analog Devices

DEMO MANUAL DC570A LTC2440 24-Bit High Speed Delta Sigma ADC Description The LTC 2440 is a high speed 24-bit ADC with 5ppm INL DC570A is a member of Linear Technologys QuikEval and 5V offset. It uses a proprietary delta-sigma architec- family of demonstration boards. It is designed to allow easy ture enabling variable speed and resolution with no latency. evaluation of the LTC2440 and may be connected directly Ten speed/resolution combinations (6.9Hz/200nV to to the target applications analog signals while using the RMS 3.5kHz/25V ) are programmed through a simple se- DC590 USB Serial Controller board and supplied software RMS rial interface. Alternatively, by pulling the serial input pin to measure performance. The exposed ground planes allow HIGH or LOW, a fast (880Hz/2V ) or ultra low noise proper grounding to prototype circuitry. After evaluating RMS (6.9Hz, 200nV , 50Hz/60Hz rejection) speed/resolu- with LTCs software, the digital signals can be connected RMS tion combination can be easily selected. The accuracy to the applications processor/controller for development (offset, full-scale, linearity, drift) and power dissipation of the serial interface. are independent of the speed selected. Since there is no Design files for this circuit board are available at latency, a speed/resolution change may be made between DEMO MANUAL DC570A Quick s tart p D Connect DC570A to a DC590 USB Serial Controller using of the strip chart display to change the oversample ratio the supplied 14-conductor ribbon cable. Connect DC590 (OSR) which will in turn change the data output rate. to host PC with a standard USB A/B cable. Run the evalu- Tools are available for logging data, changing reference ation software supplied with DC590 or downloaded from voltage, changing the number of points in the strip chart www.linear.com/software. The correct program will be and histogram, and changing the number of points aver- loaded automatically. Click the COLLECT button to start aged for the DVM display. reading the input voltage. Click the slider at the bottom dc570fa 2 ure roce