Table of Contents
Advertisement
www.ti.com
2
General Description
The CDCUN1208LP is a 2:8 fan-out buffer featuring a wide operating supply range, two universal
differential/ single ended inputs, and universal outputs (HCSL, LVDS, or LVCMOS) with clock edge rate
control. One of the device inputs includes a divider that provides divide values of /1, /2, /4, and /8. The
device is offered in a 32 pin QFN package. The CDCUN1208LP is flexible and easy to use. The
application configures the device by setting the state of certain pins at device power-up. Alternately, the
application can configure the device via SPI/I
performance, and low power consumption. The output section includes four dedicated output supply pins
enabling the operation of output ports from different power supply domains. This provides the ability to
clock devices switching at different LVCMOS levels without the need for external logic level translation
circuitry.
The evaluation module (EVM) demonstrates the electrical performance of the device. This fully-
assembled, factory-tested evaluation board allows complete validation of all device functions. For optimum
performance, the board is equipped with 50Ω SMA connectors and well-controlled 50Ω impedance micro
strip transmission lines.
3
Signal Path and Control
The CDCUN1208LP provides two selectable inputs – IN1 and IN2. The IN1 and IN2 can accept either
differential (HCSL, LVDS) signals up to 400 MHz or single ended LVCMOS signals up to 250 MHz. The
CDCUN1208LP provides up to eight differential signals or sixteen single ended signals.
In pin mode the device option is selected by six control pins. In programming, mode options are selected
by programming the on-chip registers. The CDCUN1208LP datasheet provides the detailed information
needed to configure and use this device.
All outputs are connected to SMA with ac coupling. All outputs provide the options of 50 ohm to ground
(for HCSL outputs).
4
Software Selectable Option
The provided EVM Control Software communicates with the CDCUN1208LP through a USB interface and
the SPI port. The USB controller is normally powered over the USB cable. When the USB/SPI
programming interface is available for use, the on-board LED D26 is illuminated.
The CDCUN1208LP GUI also allows device configurations to be saved into a configuration file (.INI),
which can be loaded at a later time to restore the saved settings.
5
Installing the EVM Control Software and USB Driver
To start the installation of the EVM software, double-click on the file named
"CDCUN1208LP_Installer.exe". This can be downloaded from www.ti.com/product/CDCUN1208LP/. If
Microsoft .NET Framework is not already installed on the computer, it will automatically download and
install on the computer. The installer will also attempt to install the EVM hardware driver.
SCAU050 – May 2012
Submit Documentation Feedback
2
C. The CDCUN1208LP delivers excellent additive jitter
Copyright © 2012, Texas Instruments Incorporated
General Description
CDCUN1208LP Evaluation Board
3
Advertisement
Table of Contents
