DC1057A Analog Devices

DEMO CIRCUIT 1057 LT6411 AND LTC2249 ADC QUICK START GUIDE LT6411 High-Speed ADC Driver Combo Board DESCRIPTION Demonstration circuit 1057 is a reference design DC1057 also allows the flexibility of selecting the featuring Linear Technology Corporations LT6411 CMOS output supply voltage. DC1057 includes an High Speed Amplifier/ADC Driver with an on-board on-board 40-pin edge connector for use with the LTC2249 14-bit, 80MSPS ADC. DC1057 demon- DC718 Data Acquisition demo board and Linear strates good circuit layout techniques and recom- Technologys QuickEval-II data processing soft- mended component selection for optimal system ware, available on our website at performance. The ADC driver input and output LT6411 AND LTC2249 ADC pass filtering to avoid degrading the perform- ing software. See Figure 2 for the general board ance of the ADC driver and ADC. evaluation setup diagram. NOTE. See the DC718 Quick Start Guide for instructions on using 4. Observe the ADC output with demo circuit the DC718 QuickDAACS data acquisition demo board. DC718, a USB cable, a Windows computer, and Linear Technologys QuickEval-II data process- NOTE. Even a high-quality signal synthesizer will still have noise Amplifier Power Supply ADC Power Supply and harmonics that could be attenuated with a low-pass or band-pass filter. For good-quality high order filters, see TTE, Lark Engineering, or equivalent. BPF Signal To DC718 Generator HP 8644B or equiv Signal Generator BPF Power Supply HP 8644B or equiv CMOS Output Figure 1. Proper Evaluation Equipment Setup DC718 Windows PC Input Signal Generator USB QuickDAACS w/ QuickEval-II with LPF, BPF Data Acquisition Processing Board Software Figure 2. Evaluation Setup with DC718, Computer, and QuickEval-II Software 2