QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1151 16-BIT HIGH SPEED SERIAL OUTPUT ADC LTC2274, LTC2273, LTC2272 DESCRIPTION Demonstration circuit 1151 supports a family of 16- circuitry on the analog inputs is optimized for ana- bit 105, 80, and 65MSPS analog to digital convert- log input frequencies from 1MHz to 70MHz or from ers. Each assembly features the following devices: 70MHz to 140MHz. For higher input frequencies, LTC2274, LTC2273, or LTC2272 high speed, serial contact the factory for support. output ADCs. The versions of the DC1151 demo board are listed Design files for this circuit board are available. in Table 1. Depending on the sample rate, input Call the LTC factory. frequency and CML data rate, the DC1151 is sup- LTC is a trademark of Linear Technology Corporation plied with the appropriate ADC and with an opti- mized input circuit, and de-serializing circuit. The Table 1: DC1151 Variants DC1151 ADC PART RESOLUTION MAXIMUM MINIMUM SAMPLE RATE INPUT FREQUENCY VARIANTS NUMBER SAMPLE RATE (LIMITED BY DESERIALIZER) 1151A-C LTC2274 16-Bit 105Msps 75Msps 1MHz - 70MHz 1151A-D LTC2274 16-Bit 105Msps 75Msps 70MHz - 140MHz 1151A-E LTC2273 16-Bit 80Msps 75Msps 1MHz - 70MHz 1151A-F LTC2273 16-Bit 80Msps 75Msps 70MHz - 140MHz 1151A-G LTC2272 16-Bit 65Msps 3Msps 1MHz - 70MHz 1151A-H LTC2272 16-Bit 65Msps 3Msps 70MHz - 140MHz 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1151 16-BIT HIGH SPEED SERIAL OUTPUT ADC 1. Performance Summary (T = 25C) A PARAMETER CONDITION VALUE Optimized for 3.3V Supply Voltage Supply must provide up to 500mA. 3.135 3.465V min/max Analog Input Range Depending on Sense Pin Voltage(and converter inputs) 1.5V to 2.25V PP PP Minimum Logic High 2V Logic Input Voltages Maximum Logic Low 0.8V Logic Output Voltage Minimum Logic High OVdd-0.2V Maximum Logic Low OVdd-0.4V 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 minated with 50W.) Resolution See Table 1 Input Frequency Range See Table 1 SFDR See Applicable Data Sheet SNR See Applicable Data Sheet QUICK START PROCEDURE Demonstration circuit 1151 is easy to set up to evalu- measurement equipment setup and follow the proce- ate the performance of any member of the LTC2274 dure below: family of A/D converters. Refer to Figure 1 for proper SETUP If a DC890 FastDAACS Data Analysis and Collection the required software and for connecting the DC890 to System was supplied with the DC1151 demonstration the DC1151 and to a PC running Windows 98, 2000 or circuit, follow the DC890 Quick Start Guide to install XP. 2