ONET8501P-EV
11.3 GBPS RATE-SELECTABLE LIMITING AMPLIFIER – EVALUATION BOARD
Version 0.4 · October 2007
7
TI CONFIDENTIAL
www.ti.com
MEASUREMENT SETUP
Follow this procedure to quickly setup for
measurements. The board is pre-set for open loop
operation.
1. Install the ONET8501_gui_install_v0.7.msi or
higher revision file and follow the
instructions. Use the default directory for the
installation.
2. Attach the interface cable from the USB port
of the computer to the USB port of the
evaluation board. The interface circuitry is
powered through the USB cable.
3. The driver for the USB port will need to be
installed. Follow the instructions for installing
a new driver. The driver is located at
C:\Program Files\Texas Instruments\TI
(ONET8501V-ONET8501P) Eval Board\
Driver. Once a particular USB port has been
configured, this same port must always be
used to control the interface board.
4. All control and monitoring functions are done
through the GUI so no jumpers have been
installed except J14 which is set to select an
external power supply.
5. Connect a differential data input signal
source to the SMA connectors DIN+/DIN–.
Set the data rate up to 11.3Gbps. Set the
amplitude between 5mV
p-p
differential and
2000mV
p-p
differential. For small input
signals, attenuators may be required.
6. Connect the output SMA connectors
DOUT+/DOUT– through 50
Ω
matched impe-
dance cables to a 50
Ω
oscilloscope with a
bandwidth of at least 12GHz. Ensure that the
maximum input voltage of the oscilloscope is
not exceeded. Use appropriate attenuators if
needed.
7. Apply a +3.3V supply to the +3.3V banana
jack and the supply ground to the GND
banana jack. The typical current
consumption in default mode will be about
36mA.
8. Run the GUI by clicking the ONET8501 GUI
shortcut icon on the desktop. Choose the
ONET8501P tab. The interface will be as
shown in Figure 4. The USB communication
error indicator and I2C communication
indicator should both be green as shown in
Figure 5. If the I2C indicator is red, then
press the reset button on the interface board.
9. The device will power up in a default state
with an output amplitude of 300mVpp. The
features of the device are controlled through
the corresponding sliders or selection
buttons. To use the input threshold control to
its full range, the DC offset cancellation
should be disabled. Please refer to the data
sheet for the register functionality.
10. Typical eye diagrams at 10.3125Gbps are
shown in Figures 6 and 7.
11. The ONET8501P can also be controlled
through the I2C Diag page by typing in the
HEX values for the appropriate registers and
clicking on the Write Bytes box. The register
values can be read by clicking on the Read
Bytes box.