Features and Benefits
Demonstration circuit 2609A features the LTC6952, an Ultralow Jitter, 4.5GHz PLL with 11 Outputs and JESD204B Support.
By default, the DC2609A is powered from two supplies. The 9V-12V supply input powers the onboard reference and VCO circuitry, along with the LTC6952 5V supply pin. The 4V-6V supply input powers the LTC6952 3.3V supply pins. A reduced power option is provided that allows the LTC6952’s output supply pins to connect to an LTC Silent Switcher® and the LTC6952 input supply pins to connect to a low noise LDO.
All differential inputs and six of the differential outputs are populated with 0.5” spaced SMA connectors. These outputs are AC-coupled with 50Ω transmission lines making them suitable to drive 50Ω impedance instruments. The remaining five differential outputs are terminated with 100Ω.
The LTC6952’s EZSync™ and SYSREF request functions are made available via the LTC6952 SPI interface or the EZS_SRQ SMA/turret connectors. The DC2609A, DC2610A, and DC2611A SMA placement was designed for ease of connection for all multi-part synchronization and SYSREF request modes.
The VTUNE and VCO SMAs can mate directly with the DC2664A VCO rider board. This options allows for a quick method to evaluate multiple VCOs.
A DC2026 USB serial controller board is used for SPI communication with the LTC6952, controlled by the supplied LTC6952Wizard™ software.