+ DEMO MANUAL DC845A LTC2448: 24-Bit, High Speed, 8-/16-Channel ADC with Selectable Speed/Resolution Description The LTC 2448 is an 8-/16-channel, high speed, 24-bit easy evaluation of the LTC2448 and may be connected ADC with ten selectable speed/resolution modes from directly to the target applications analog signals while 6.9Hz/280nV to 3.5kHz/25V . Key DC specifica- using the DC590 USB serial controller board and supplied RMS RMS tions include 5ppm INL, 5V offset, 10ppm full-scale error software to measure performance. The exposed ground and 20nV/C offset drift. In the 6.9Hz/280nV mode, planes allow proper grounding to prototype circuitry. After RMS an input normal mode rejection of 50Hz and 60Hz noise evaluating with LTCs software, the digital signals can be is better than a 87dB. The accuracy (offset, full-scale, connected to the applications processor/controller for linearity, drift) and power dissipation are independent of development of the serial interface. the speed selected. Design files for this circuit board are available at DC845A is a member of Linear Technologys QuikEval DEMO MANUAL DC845A Quick s Dp n n Connect the DC845A to a DC590 USB serial controller Click the slider at the bottom of the strip chart display using the supplied 14-conductor ribbon cable. to change the oversample ratio (OSR) which will, in turn, change the data output rate. n Connect the DC590 to a host PC with a standard USB A/B cable. Tools are available for logging data, changing reference voltage, changing the number of points in the strip chart n Run the evaluation software supplied with the DC590, and histogram, and changing the number of points aver- or download it from www.linear.com/software. The aged for the DVM display. correct program will be loaded automatically. n Click the COLLECT button to start reading the input voltage. Figure 1. DC847A Evaluation Software dc845af 2 ure roce tart