DC1098A-B Analog Devices

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1098 10/12/14-BIT 125 MSPS ADC LTC2281, LTC2283, LTC2285 DESCRIPTION Demonstration circuit 1098 supports a family of put circuit. The circuitry on the analog inputs is 10/12/14-BIT 125 MSPS ADCs. Each assembly fea- optimized for analog input frequencies below tures one member of this family of high speed, high 70 MHz or from 70 MHz to 140MHz. For higher dynamic range ADCs. input frequencies, contact the factory for support. The versions of 1098 demo board are listed in Table Design files for this circuit board are available. 1. Depending on the required resolution, sample Call the LTC factory. rate and input frequency, the DC1098 is supplied LTC is a trademark of Linear Technology Corporation with the appropriate A/D and with an optimized in- 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1098 10/12/14-BIT 125 MSPS ADC Table 1. DC1098A Variants DC1098 VARIANTS ADC PART NUMBER RESOLUTION* MAXIMUM SAMPLE RATE INPUT FREQUENCY 1098A-A LTC2281 10-Bit 125 MSPS 1MHz - 70MHz 1098A-B LTC2283 12-Bit 125 MSPS 1MHz - 70MHz 1098A-C LTC2295 14-Bit 125 MSPS 1MHz -70MHz 1098A-D LTC2291 10-Bit 125 MSPS 70MHz -140MHz 1098A-E LTC2293 12-bit 125 MSPS 70MHz -140MHz 1098A-F LTC2295 14-Bit 125 MSPS 70MHz -140MHz Table 2. Performance Summary (T = 25C) A PARAMETER CONDITION VALUE Optimized for 3.0V Depending on sampling rate and the A/D converter provided, Supply Voltage this supply must provide up to 200mA. 2.7V 3.6V min/max Analog Input Range Depending on Sense Pin Voltage 1V to 2V PP PP Minimum Logic High 2.4V Logic Input Voltages Maximum Logic Low 0.8V Logic Output Voltage Minimum Logic High -1.6mA 2.3V (33W Series terminations) (74VCX245 output buffer, V = 2.5V) Maximum Logic Low 1.6mA 0.7V (33W Series terminations) cc Sampling Frequency (Convert Clock Frequency) See Table 1 Convert Clock Level 50 W Source Impedance, AC coupled or ground referenced 2V 2.5V Sine Wave P-P P-P (Convert Clock input is capacitor coupled on board and ter- or Square wave (See Note 1) minated with 50W.) Resolution See Table 1 Input Frequency Range See Table 1 SFDR See Applicable Data Sheet SNR See Applicable Data Sheet Note 1: For sample rates below 20MSPS a square wave must be used to achieve full performance. 2