DEMO MANUAL DC1011A LTC2498, LTC2496, LTC2494 24-bit/16-bit, 8-/16-Channel, Easy Drive S ADC with SPI Interface Description Demonstration Circuit 1011A-A features the LTC 2498 easy evaluation of the LTC2498, LTC2496 or LTC2494 8-/16-channel, 24-bit Delta Sigma ADC with Easy Drive and may be connected directly to the target applications inputs. Key DC specifications include 2ppm INL, 1ppm analog signals while using the DC590 USB Serial Control- offset, 25ppm full-scale error and 10nV/C offset drift. In ler board and QuikEval software to measure performance. the 6.9Hz/280nV mode, input normal mode rejection The exposed ground planes allow proper grounding to RMS of 50Hz and 60Hz noise is better than 87dB. prototype circuitry. After evaluating with LTCs software, the digital signals can be connected to the applications DC1011A-B features the LTC2496 16-bit ADC that is processor/controller for development of the serial interface. pinout and software compatible with the LTC2498. Design files for this circuit board are available at DC1011A-C features the LTC2494 16-bit ADC with DEMO MANUAL DC1011A Quick s p D Connect the DC1011A to a DC590 USB Serial Controller of the strip-chart display to change the oversample ratio using the supplied 14-conductor ribbon cable. Connect (OSR) which will in turn change the data output rate. DC590 to host PC with a standard USB A/B cable. Run the Tools are available for logging data, changing reference evaluation software supplied with DC590 or downloaded voltage, changing the number of points in the strip chart from www.linear.com/software. The correct program will and histogram, and changing the number of points aver- be loaded automatically. Click the COLLECT button to start aged for the DVM display. reading the input voltage. Click the slider at the bottom Har D s JuMPEr S Conn ECtion to DC590 S Erial Controll Er JP1, JP3: Select the source for REF+ and REF, respec- J2 is the power and digital interface connector. Connect to tively. REF+ can be 5V from the on-board LT1236 reference a DC590 serial controller with the supplied 14-conductor (default) or supplied externally. REF can be Ground (0V, ribbon cable. Digital signals are also connected to through- default) or supplied externally. hole test points on the circuit board. JP2: Select source for analog COM input, either tied to ground or supplied externally to the COM turret post. dc1011af 2 etup ware ure roce tart