1
Rev 0
DEMO MANUAL DC2609A
DESCRIPTION
LTC6952
Ultralow Jitter, 4.5GHz PLL with 11 Outputs
and JESD204B Support
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 remain-
ing five differential outputs are terminated with 100Ω.
All registered trademarks and trademarks are the property of their respective owners.
The LTC6952’s EZSync™ and SYSREF request func-
tions 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 V
TUNE
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 sup-
plied LTC6952Wizard™ software.
DC2609 Design files are available.
Figure 1. DC2609A Connections
RIBBON CABLE CONNECTION
TO DC590 OR DC2026
OUT1, CML
AC-COUPLED
OUTPUTS, SMA
OUT0, CML
AC-COUPLED
OUTPUTS, SMA
9-12V SUPPLY,
BANANA JACK J30
OUT9, CML
AC-COUPLED
OUTPUTS, SMA
OUT8, CML
AC-COUPLED
OUTPUTS, SMA
ONBOARD VCO &
SUPPORT CIRCUITRY
OUT5, CML
AC-COUPLED
OUTPUTS, SMA
OUT4, CML
AC-COUPLED
OUTPUTS, SMA
STAT LED, D1
4-6V SUPPLY,
BANANA JACK J32
ONBOARD REFERENCE
(BOTTOM SIDE)
POWER SUPPLY
SUPPORT CIRCUITRY
(TOP & BOTTOM SIDE)
LTC6952
DEMO CIRCUIT 2609A
