QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 782 10/12/14 BIT 10 TO 125 MSPS ADC LTC2236, LTC2237, LTC2238, LTC2239, LTC2225, LTC2226, LTC2227, LTC2228, LTC2229, LTC2245, LTC2246, LTC2247, LTC2248, LTC2249 LTC2250, LTC2251, LTC2252, LTC2253, LTC2254, or LTC2255 DESCRIPTION Demonstration circuit 782 supports a family of Depending on the required resolution, sample rate 10/12/14 BIT 10 TO 125 MSPS ADCs. Each as- and input frequency, the DC782 is supplied with the sembly features one of the following devices: appropriate A/D and with an optimized input circuit LTC2236, LTC2237, LTC2238, LTC2239, LTC2225, The circuitry on the analog inputs is optimized for LTC2226, LTC2227, LTC2228, LTC2229, LTC2245, analog input frequencies below 70 MHz or between LTC2246, LTC2247, LTC2248, LTC2249, LTC2250, 70 MHz to 170 MHz (Please read ANALOG INPUT LTC2251 LTC2253, LTC2254, or LTC2255 high NETWORK SECTION). For Higher operating fre- speed, high dynamic range ADCs. quencies, contact the factory for support. Several versions of the 782A demo board support- Design files for this circuit board are available. Call the LTC factory. ing the 10 BIT, 12 BIT and 14 BIT series of A/D con- LTC is a trademark of Linear Technology Corporation verters across the 10 to 125 MSPS speed/power range are listed in Table 1. 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 782 10/12/14 BIT 10 TO 125 MSPS ADC Table 1. DC782A Variants DC782 VARIANTS ADC PART NUMBER RESOLUTION* MAXIMUM SAMPLE INPUT FREQUENCY RATE 782A-A LTC2249 14-Bit 80Msps 1MHz < A < 70MHz IN 782A-B LTC2248 14-Bit 65Msps 1MHz < A < 70MHz IN 782A-C LTC2247 14-Bit 40Msps 1MHz < A < 70MHz IN 782A-D LTC2246 14-Bit 25Msps 1MHz < A < 70MHz IN 782A-E LTC2245 14-Bit 10Msps 1MHz < A < 70MHz IN 782A-F LTC2229 12-Bit 80Msps 1MHz < A < 70MHz IN 782A-G LTC2228 12-Bit 65Msps 1MHz < A < 70MHz IN 782A-H LTC2227 12-Bit 40Msps 1MHz < A < 70MHz IN 782A-J LTC2226 12-Bit 25Msps 1MHz < A < 70MHz IN 782A-K LTC2225 12-Bit 10Msps 1MHz < A < 70MHz IN 782A-L LTC2239 10-Bit 80Msps 1MHz < A < 70MHz IN 782A-M LTC2238 10-Bit 65Msps 1MHz < A < 70MHz IN 782A-N LTC2237 10-Bit 40Msps 1MHz < A < 70MHz IN 782A-P LTC2236 10-Bit 25Msps 1MHz < A < 70MHz IN 782A-Q LTC2249 14-Bit 80Msps 70MHz <A < 170MHz IN 782A-R LTC2248 14-Bit 65Msps 70MHz <A < 170MHz IN 782A-S LTC2255 14-Bit 125 Msps 10MHz <A < 170MHz IN 782A-T LTC2254 14-Bit 105 Msps 10MHz <A < 170MHz IN 782A-U LTC2253 12-Bit 125 Msps 10MHz <A < 170MHz IN 782A-V LTC2252 12-Bit 105 Msps 10MHz <A < 170MHz IN 782A-W LTC2251 10-Bit 125 Msps 10MHz <A < 170MHz IN 782A-X LTC2250 10-Bit 105 Msps 10MHz <A < 170MHz IN 2