ANALOG DEVICES DC2248A-A

DC2248A-A demonstration circuit features the LTC®6951, an ultralow jitter multi-output clock synthesizer with integrated VCO. Direct access to the LTC6951 5V, 3.3V and the reference supplies is possible by removing jumpers. For evaluation of the LTC6951 with other references, the DC2248A can be modified to accommodate different onboard or external components. All differential inputs and outputs have 0.5" spaced SMA connectors. The DC2248A has four AC coupled CML outputs with 50Ω transmission lines making them suitable to drive 50 ohm impedance instruments. The LVDS output is DC coupled. The LTC6951’s synchronization functions are made available via the LTC6951 SPI interface, an SMA connector and a turret. The DC2248A can be modified to use an onboard switch and debounce circuit to control the sync pin. A DC2026 (or DC590B) USB serial controller board is used for SPI communication with the LTC6951, controlled by the supplied LTC6951Wizard™ software.