DC2248A-A Analog Devices

DEMO MANUAL DC2248A LTC6951 Ultralow Jitter Multi-Output Clock Synthesizer with Integrated VCO Description Demonstration circuit 2248A features the LTC 6951, to drive 50 impedance instruments. The LVDS output an Ultralow Jitter Multi-Output Clock Synthesizer with is DC coupled. Integrated VCO. The LTC6951s synchronization functions are made avail- For ease of use, the DC2248A is powered from a single able via the LTC6951 SPI interface, an SMA connector and 6V supply and comes installed with a 100MHz reference. a turret. The DC2248A can be modified to use an onboard Direct access to the LTC6951 5V, 3.3V and the reference switch and debounce circuit to control the sync pin. supplies is possible by removing jumpers. For evalua- A DC2026 (or DC590B) USB serial controller board is used tion of the LTC6951 with other references, the DC2248A for SPI communication with the LTC6951, controlled by can be modified to accommodate different onboard or the supplied LTC6951Wizard software. external components. Design files for this circuit board are available at All differential inputs and outputs have 0.5 spaced SMA DEMO MANUAL DC2248A Quick s tart p D The DC2248A is easy to set up to evaluate the performance LTC6951Wizard Installation of the LTC6951. Follow the procedure below. The LTC6951Wizard software is used to communicate with The LTC6951Wizard and the DC2026 (or DC590B) are the LTC6951. It uses the DC2026 (or DC590B) to translate required to control the DC2248A through a personal between USB and SPI-compatible serial communications computer (PC). formats. It also includes advanced PLL design and simu- lation capabilities. The following are the LTC6951Wizard DC2026 and DC590B Configuration system requirements: DC2026: Refer to Figure 2. Set the JP3 jumper to the 3.3V Windows Operating System: Windows XP, Windows (preferred) or 5V position. 2003 Server, Windows Vista, Windows 7 DC590B: Refer to Figure 2. Set the JP6 jumper to the 3.3V Microsoft .NET 3.5 SP1 or later (preferred) or 5V position. JP4 should select EN, JP5 Windows Installer 3.1 or later ISO and SW should both select ON. Linear Technologys DC590B or DC2026 (with the Connect either the DC2026 (or DC590B) to one of your DC590B emulator sketch loaded) computers USB ports with the included USB cable. The DC2026 arrives from the factory with the DC590B The DC2026 has the ability to run Linduino code. Refer to emulator sketch loaded. If this is not the case refer to the