DEMO MANUAL DC1996A LTC2323/LTC2321 Dual 16-Bit/14-Bit/12-Bit, 5Msps/2Msps, Serial, High Speed SAR ADCs DESCRIPTION Demonstration circuit 1996A features the LTC 2323 family. DC1996A demonstrates the DC and AC performance of With up to 5Msps, these differential, dual channel, 16-bit, the LTC2323 in conjunction with the DC890 PScope serial, high speed successive approximation register data collection board. Alternatively, by connecting the (SAR) ADCs are available in a 28-lead QFN package. The DC1996A into a customer application, the performance LTC2323 family has an internal 20ppm/C reference and of the LTC2323 can be evaluated directly in that circuit. an SPI-compatible serial interface that supports CMOS Design files for this circuit board are available at and LVDS logic. Note the demo board is configured for DEMO MANUAL DC1996A ASSEMBLY OPTIONS Table 1. DC1996A Assembly Options VERSION U1 PART NUMBER MAX CONVERSION RATE OF BITS MAX CLOCK FREQUENCY DC1996A-A LTC2323CUFD-16 PBF 5Msps 16 110MHz DC1996A-B LTC2321CUFD-16 PBF 2Msps 16 64MHz DC1996A-C LTC2323CUFD-14 PBF 5Msps 14 110MHz DC1996A-D LTC2321CUFD-14 PBF 2Msps 14 62MHz DC1996A-E LTC2323CUFD-12 PBF 5Msps 12 95MHz DC1996A-F LTC2321CUFD-12 PBF 2Msps 12 58MHz QUICK START PROCEDURE Demonstration circuit 1996A is easy to set up and evaluate The PScope software should recognize the DC1996A and configure itself automatically. for performance. Refer to Figure 1 and follow the proce- dure below. n Click the Collect button (Figure 2) to begin acquiring n data. The Collect button then changes to Pause, which Connect the DC1996A to a DC890 USB high speed data can be used to stop data acquisition. collection board using edge connector P1. n Connect the DC890 to a host PC with a standard USB A/B cable. n Apply a low jitter signal source to J2 to test channel 2, or to J4 to test channel 1. Note that the DC1996A is capable of accepting a differential input signal as well as a single-ended signal. See the Hardware Setup section for the jumper positions that correspond to these configurations. n As a clock source, apply a low jitter 10dBm sine wave or square wave to connector J1. See Table 1 for maximum clock frequencies. Note that J1 has a 50 termination resistor to ground. n Run the PScope software (Pscope.exe version K73, or later) supplied with the DC890 or download it from www.linear.com/software. Complete software doc- umentation is available from the Help menu. Updates can be downloaded from the Tools menu. Check for updates periodically, as new features may be added. Figure 2. DC1996A PScope Screenshot dc1996afb 2