DEMO MANUAL DC1369A 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 Description Demonstration circuit 1369A supports a family of Several versions of the 1369A demo board supporting the 14/12-bit 25Msps to 150Msps ADCs. Each assembly LTC2261 14/12-bit series of A/D converters are listed in features one of the following devices: LTC2262-14 or Table 1. Depending on the required resolution and sample LTC2262-12, LTC2261-14, LTC2261-12, LTC2260-14, rate, the DC1369A is supplied with the appropriate ADC. LTC2260-12, LTC2259-14, LTC2259-12, LTC2258-14, The circuitry on the analog inputs is optimized for analog LTC2258-12, LTC2257-14, LTC2257-12, LTC2256-14, input frequencies from 5MHz to 170MHz. Refer to the LTC2256-12, high speed, high dynamic range ADCs. data sheet for proper input networks for different input frequencies. Demonstration circuit 1369A supports the LTC2261 family DDR LVDS output mode. This family of ADCs is also sup- Design files for this circuit board are available at ported by demonstration circuit 1370A, which is compatible DEMO MANUAL DC1369A Quick s tart p D Table 2. DC1369A Variants DC1369A VARIANTS ADC PART NUMBER RESOLUTION MAXIMUM SAMPLE RATE INPUT FREQUENCY 1369A-A LTC2261-14 14-Bit 125Msps 5MHz to 170MHz 1369A-B LTC2260-14 14-Bit 105Msps 5MHz to 170MHz 1369A-C LTC2259-14 14-Bit 80Msps 5MHz to 170MHz 1369A-D LTC2258-14 14-Bit 65Msps 5MHz to 170MHz 1369A-E LTC2257-14 14-Bit 40Msps 5MHz to 170MHz 1369A-F LTC2256-14 14-Bit 25Msps 5MHz to 170MHz 1369A-G LTC2261-12 12-Bit 125Msps 5MHz to 170MHz 1369A-H LTC2260-12 12-Bit 105Msps 5MHz to 170MHz 1369A-I LTC2259-12 12-Bit 80Msps 5MHz to 170MHz 1369A-J LTC2258-12 12-Bit 65Msps 5MHz to 170MHz 1369A-K LTC2257-12 12-Bit 40Msps 5MHz to 170MHz 1369A-L LTC2256-12 12-Bit 25Msps 5MHz to 170MHz 1369A-M LTC2262-14 14-Bit 150Msps 5MHz to 170MHz 1369A-N LTC2262-12 12-Bit 150Msps 5MHz to 170MHz Demonstration circuit 1369A is easy to set up to evaluate Applying Power and Signals to the DC1369A the performance of the LTC2262 family of A/D converters. Demonstration Circuit Refer to Figure 1 for proper measurement equipment setup If a DC890 is used to acquire data from the DC1369A, and follow the procedure below: 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 QuikEval II Data Acquisition and Collection DC1369A. DC1369A requires 3.6V for proper operation. System was supplied with the DC1369A demonstration Regulators on the board produce the voltages required for circuit, follow the DC890 Quick Start Guide to install the the ADC. The DC1369A demonstration circuit requires up required software and for connecting the DC890 to the to 250mA depending on the sampling rate and the A/D DC1369A and to a PC. converter supplied. The DC890 data collection board is powered by the USB DC1369A Demonstration Circuit Board Jumpers cable and does not require an external power supply unless The DC1369A demonstration circuit board should have it must be connected to the PC through an unpowered hub, the following jumper settings as default positions (as per in which case it must be supplied an external 6V to 9V on Figure 1): turrets G7(+) and G1() or the adjacent 2.1mm power jack. JP2: PAR/SER: Selects Parallel or Serial programming Analog Input Network mode. (Default Serial) For optimal distortion and noise performance the RC JP3: Duty Cycle Stabilizer: Enables/Disable Duty Cycle network on the analog inputs may need to be optimized Stabilizer. (Default Enable) for different analog input frequencies. For input frequen- JP4: SHDN: Enables and disables the LTC2262 cies above 170MHz, refer to the LTC2262 data sheet for a (Default Enable) proper input network. Other input networks may be more appropriate for input frequencies less that 5MHz. dc1369af 2 ure roce