DEMO MANUAL DC1186A LTC2308 500ksps, 8-Channel, 12-Bit ADC Description Demonstration circuit 1186A features the LTC 2308 DC linearity. Use DC890 controller with PScope software 500ksps, 8-channel, 12-bit ADC. The LTC2308 has an if precise sampling rates are required or to demonstrate SPI-compatible serial interface that can be used to select AC performance such as SNR, THD, SINAD and SFDR. channel, unipolar/bipolar and power-down settings. Alternatively, by connecting DC1186A into a customer DC1186A demonstrates the DC and AC performance of application, the performance of the LTC2308 can be evalu- the LTC2308. ated directly in that circuit. Use DC590 controller with QuikEval software to dem- Design files for this circuit board are available at onstrate DC performance such as peak-to-peak noise and DEMO MANUAL DC1186A D890c Quick s Dp n Connect the DC1186A to a DC890 USB high speed data a 50 termination resistor to ground, which will prevent collection board via connector J4. most logic from driving this pin directly. n n Connect the DC890 to a host PC with a standard USB Run the PScope software (Pscope.exe version K49 or A/B cable. later) supplied with the DC890, or download it from www.linear.com/software. Complete software docu- n Apply 6V to 9V to the 6-9VDC and GND terminals. DC DC mentation is available from the Help menu. Updates n Apply a low jitter signal source to CH0 through CH7 on can be downloaded from the Tools menu. Check for connectors J1 or J2, as determined by jumper block JP5. updates periodically as new features may be added. n As a clock source, apply a low jitter 40MHz 14dBm sine wave or square wave to connector J5. Note that J5 has p s c n The PScope software will recognize the DC1186A and Select Configure Manually, 12-Bits, Alignment 12, configure itself automatically. The default configuration S2308, 1-Channel and do not check Positive Edge Clk. is for CH0 with respect to COM in unipolar mode. Check Bipolar if the JP5 UNI jumper is set to GND. An example of the user configure menu is shown in n Make sure that the jumpers are set as shown in Figure2. Figure 3. If bipolar mode is desired, it will be necessary to change n the PScope user configure setting. Click the Collect button (see Figure 4) to begin acquiring data. Depending on which board was previously used by n Select ADC Configuration from the Configure menu. PScope, it may be necessary to press Collect a second time. The Collect button then changes to Pause, which can be used to pause data acquisition. Figure 2. DC1186A Jumpers dc1186af 2 onfiguration oftware scope ure roce tart