DEMO MANUAL DC1370A LTC2262-14/-12, LTC2261-14/-12, LTC2260-14/-12, LTC2259-14/-12, LTC2258-14/-12, LTC2257-14/-12, LTC2256-14/-12, 14-/12-Bit, 25Msps to 150Msps ADCs De S P Demonstration circuit 1370A supports a family of 14-/12-Bit Several versions of the 1370A demo board supporting the 25Msps to 150Msps ADCs. Each assembly features one LTC2262 14-/12-Bit series of A/D converters are listed in of the following devices: LTC2262-14, LTC2262-12 Table 1. Depending on the required resolution and sample LTC2261-14, LTC2261-12, LTC2260-14, LTC2260-12, rate, the DC1370A is supplied with the appropriate ADC. LTC2259-14, LTC2259-12, LTC2258-14, LTC2258-12, The circuitry on the analog inputs is optimized for analog LTC2257-14, LTC2257-12, LTC2256-14, LTC2256-12, high input frequencies from 5MHz to 170MHz. Refer to the speed, high dynamic range ADCs. data sheet for proper input networks for different input frequencies. Demonstration circuit 1370A supports the LTC2262 family full rate CMOS, and DDR CMOS output mode. This family Design files for this circuit board are available at of ADCs is also supported by demonstration circuit 1369, DEMO MANUAL DC1370A Quick Start Proce D Table 1. DC1370A Variants DC1370A VARIANTS ADC PART NUMBER RESOLUTION MAXIMUM SAMPLE RATE INPUT FREQUENCY 1370A-A LTC2261-14 14-Bit 125Msps 5MHz to 170MHz 1370A-B LTC2260-14 14-Bit 105Msps 5MHz to 170MHz 1370A-C LTC2259-14 14-Bit 80Msps 5MHz to 170MHz 1370A-D LTC2258-14 14-Bit 65Msps 5MHz to 170MHz 1370A-E LTC2257-14 14-Bit 40Msps 5MHz to 170MHz 1370A-F LTC2256-14 14-Bit 25Msps 5MHz to 170MHz 1370A-G LTC2261-12 12-Bit 125Msps 5MHz to 170MHz 1370A-H LTC2260-12 12-Bit 105Msps 5MHz to 170MHz 1370A-I LTC2259-12 12-Bit 80Msps 5MHz to 170MHz 1370A-J LTC2258-12 12-Bit 65Msps 5MHz to 170MHz 1370A-K LTC2257-12 12-Bit 40Msps 5MHz to 170MHz 1370A-L LTC2256-12 12-Bit 25Msps 5MHz to 170MHz 1370A-M LTC2262-14 14-Bit 150Msps 5MHz to 170MHz 1370A-N LTC2262-12 12-Bit 150Msps 5MHz to 170MHz Demonstration circuit 1370A is easy to set up to evaluate Applying Power and Signals to the DC1370A the performance of the LTC2262 A/D converters. Refer to Demonstration Circuit Figure 1 for proper measurement equipment setup and If a DC890 is used to acquire data from the DC1370A, follow the procedure: the DC890 must FIRST be connected to a powered USB port or provided an external 6V to 9V BEFORE applying Setup + 3.6V to 6.0V across the pins marked V and GND on the If a DC890 QuikEvalII Data Acquisition and Collection DC1370A. DC1370A requires 3.6V for proper operation. System was supplied with the DC1370A demonstration Regulators on the board produce the voltages required for circuit, follow the DC890 Quick Start Guide to install the the ADC. The DC1370A demonstration circuit requires up required software and for connecting the DC890 to the to 150mA depending on the sampling rate and the A/D DC1370A and to a PC. converter supplied. The DC890 data collection board is powered by the USB DC1370A Demonstration Circuit Board Jumpers cable and does not require an external power supply unless The DC1370A demonstration circuit board should have it must be connected to the PC through an un-powered the following jumper settings as default positions: (as hub, in which case it must be supplied an external 6V to per Figure 1) 9V on turrets G7(+) and G1() or the adjacent 2.1mm power jack. JP2: PAR/SER: Selects Parallel or Serial programming mode. (Default - Serial) Analog Input Network JP3: Duty Cycle Stabilizer: Enables/Disable Duty Cycle For optimal distortion and noise performance the RC Stabilizer. (Default - Enable) network on the analog inputs may need to be optimized JP4: SHDN: Enables and disables the LTC2262. for different analog input frequencies. For input frequen- (Default - Enable) cies above 170MHz, refer to the LTC2262 data sheet for a proper input network. Other input networks may be more appropriate for input frequencies less that 5MHz. dc1730afa 2 ure