Texas Instruments ONET8501P-EV User manual

ONET8501P-EV
11.3 GBPS RATE SELECTABLE LIMITING AMPLIFIER – EVALUATION BOARD
Version 0.4 · October 2007
1
TI CONFIDENTIAL
www.ti.com
11.3 Gbps Rate-Selectable Limiting Amplifier Evaluation Board
FEATURES ________________________________________________________________________
•Easy to use Evaluation Board for 11.3Gbps
Limiting Amplifier ONET8501P
•Easy Device Programming with USB to I2C
Interface
•GUI to Control Functionality
•Includes Calibration Path
•Fully Assembled and Tested
GENERAL DESCRIPTION ____________________________________________________________
The ONET8501P-EV evaluation board is designed
for easy quick-test as well as comprehensive
evaluation of the ONET8501P 11.3Gbps rate-
selectable limiting amplifier.
This fully assembled and factory tested evaluation
board allows complete validation of all device
functions.
For optimum performance, the board is equipped
with 50ΩSMA connectors and well-controlled 50Ω
impedance microstrip transmission lines.
In order to account for measurement inaccuracies
caused by inevitable line loss, calibration lines are
provided, consisting of the same type of SMA
connectors and microstrip transmission line layout.
Using the GUI, the bandwidth, output amplitude,
output pre-emphasis, input threshold voltage (slice
level) and the loss of signal assert level can be
adjusted.
Figure 1: ONET8501P-EV Evaluation Board.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appear at the end of this data sheet.

ONET8501P-EV
11.3 GBPS RATE-SELECTABLE LIMITING AMPLIFIER – EVALUATION BOARD
Version 0.4 · October 2007
2
TI CONFIDENTIAL
www.ti.com
EV BOARD SCHEMATIC DIAGRAM ____________________________________________________
The EV board schematic diagram is given in Figure 2
Signal Path and Control Circuitry
Supply Filtering and Calibration Lines

ONET8501P-EV
11.3 GBPS RATE SELECTABLE LIMITING AMPLIFIER EVALUATION BOARD
Version 0.4 · Revised October 2007
3
TI CONFIDENTIAL
Copyright ©2003, Texas Instruments Incorporated
PRODUCT
PREVIEW
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products in the formative or design phase of
development. Characteristic data and other
specifications are design goals. Texas
Instruments reserves the right to change or
discontinue these products without notice.
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USB Interface
Figure 2: ONET8501P-EV Evaluation Board Schematic
.

ONET8501P-EV
11.3 GBPS RATE-SELECTABLE LIMITING AMPLIFIER EVALUATION BOARD
Version 0.4 · Revised October 2007
4
TI CONFIDENTIAL
www.ti.com
CALIBRATION LINE _________________________________________________________________
For optimum performance, the EV board is equipped
with 50ΩSMA connectors and well-controlled 50Ω
impedance microstrip transmission lines in the high-
speed data-signal path. However, inevitable line loss
occurs at high frequencies.
In order to account for the resulting measurement
inaccuracies, calibration lines are provided consisting
of the same type of SMA connectors and microstrip
transmission line layout as used in the high-speed
data-signal path.
The microstrip lines are designed as 50Ωmicrostrip
lines close to the SMA connectors. Close to the chip,
the gap between the two lines of the differential pair
narrows resulting in reduced common mode
matching. The differential line impedance however is
kept constant at 100Ωon the entire board.
The calibration line is intended to be used for S21
and S12 calibration purposes. Furthermore, in the
time domain it helps to determine the impact of the
EV board on signal edge speed as well as
deterministic jitter.
SIGNAL PATH AND CONTROL CIRCUITRY _____________________________________________
The signal path consists of the input port SMA
connectors DIN+ and DIN-, the coupling capacitors
C14 and C19, the 50Ωsingle ended / 100Ω
differential input transmission lines, the ONET8501P,
the 50Ωsingle ended / 100Ωdifferential output
transmission lines, the coupling capacitors C15 and
C20, and the output port SMA connectors DOUT+
and DOUT-.
The ONET8501P uses a two-wire serial interface for
digital control of the bandwidth, output amplitude,
output pre-emphasis, input threshold voltage (slice
level) and the loss of signal assert level.
Predetermined settings for bandwidth and LOS
assert levels can also be selected with the external
rate selection pins (RATE1 and RATE0). For more
information on the use of the two-wire interface,
please refer to the ONET8501P data sheet.
The ONET8501P-EV is set-up for full control and
monitoring through the two-wire interface. Manual
control of such features as external rate selection
and output disable can be done by cutting traces at
the appropriate points and using jumpers.

ONET8501P-EV
11.3 GBPS RATE-SELECTABLE LIMITING AMPLIFIER – EVALUATION BOARD
Version 0.4 · October 2007
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TI CONFIDENTIAL
www.ti.com
JUMPER AND CONNECTOR LOCATION AND DESCRIPTION
The location of all connectors and jumpers are shown
in Figure 3 below.
A description of the jumpers and connectors is given
in Table 1.
Follow the guidelines in the measurement setup
section to quickly get started.
Figure 3: ONET8501-EV Evaluation Board Jumper and Connector Locations
JP1 (Vcc Connection) JP2 (GND Connection)
DIN+
DIN-
DOUT+
DOUT-
CALOUT+
CALOUT-
CALIN-
CALIN+
D8 (LOS indicator)
USB Connector
Reset Button
D7 (Disable indicator)
J14 (Power Selection)

ONET8501P-EV
11.3 GBPS RATE-SELECTABLE LIMITING AMPLIFIER – EVALUATION BOARD
Version 0.4 · October 2007
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TI CONFIDENTIAL
www.ti.com
Symbol Connector / Jumper Function
DIN+ Non-inverted data input signal SMA connector for non-inverted input data signal. On board AC coupled and
on-chip differentially 100Ωterminated to DIN-.
DIN– Inverted data input signal SMA connector for inverted input data signal. On board AC coupled and on-
chip differentially 100Ωterminated to DIN+.
DOUT+ Non-inverted data output signal SMA connector for non-inverted output data signal. On board AC coupled and
on-chip 50Ωback-terminated to VCC.
DOUT – Inverted data output signal SMA connector for inverted output data signal. On board AC coupled and on-
chip 50Ω back-terminated to VCC.
CALIN+ Non-inverted calibration line input SMA connector for non-inverted calibration line input.
CALIN– Inverted calibration line input SMA connector for inverted calibration line input.
CALOUT+ Non-inverted calibration line output SMA connector for non-inverted calibration line output.
CALOUT– Inverted calibration line output SMA connector for inverted calibration line output.
J14 Power supply selection Place a jumper on pins 1 and 2 to select an external power supply through JP1
and JP2. Place a jumper on pins 2 and 3 to use supply through the USB cable.
D7 DIS LED is turned on if the output is disabled.
D8 LOS indicator LED is turned on if the applied input signal level is below the programmed
threshold level.
Table 1: Jumper and Connector Description

ONET8501P-EV
11.3 GBPS RATE-SELECTABLE LIMITING AMPLIFIER – EVALUATION BOARD
Version 0.4 · October 2007
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TI CONFIDENTIAL
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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 5mVp-p differential and
2000mVp-p differential. For small input
signals, attenuators may be required.
6. Connect the output SMA connectors
DOUT+/DOUT– through 50Ωmatched impe-
dance cables to a 50Ωoscilloscope 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.

ONET8501P-EV
11.3 GBPS RATE-SELECTABLE LIMITING AMPLIFIER – EVALUATION BOARD
Version 0.4 · October 2007
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TI CONFIDENTIAL
www.ti.com
Figure 4: ONET8501P GUI
Figure 5: ONET8501P I2C Diag Page

ONET8501P-EV
11.3 GBPS RATE-SELECTABLE LIMITING AMPLIFIER – EVALUATION BOARD
Version 0.4 · October 2007
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TI CONFIDENTIAL
www.ti.com
Figure 6: Output Eye-Diagram at 10.3125Gbps, Highest Bandwidth Setting
and 600mVpp Output Setting with 10mVpp, 231-1 PRBS Input
Figure 7: Output Eye-Diagram at 10.3125Gbps, Highest Bandwidth Setting
and 600mVpp Output Setting with 1000mVpp, 231-1 PRBS Input

ONET8501P-EV
11.3 GBPS RATE-SELECTABLE LIMITING AMPLIFIER – EVALUATION BOARD
Version 0.4 · October 2007
10
TI CONFIDENTIAL
www.ti.com
REVISION HISTORY
Rev # Date Description Author
0.1 02/22/2007 Initial Draft. Alex Davidson
0.2 02/26/2007 Added GUI interface Fig. 4 and changed Fig. 5 A. Davidson
0.3 02/28/2007 Updated Figures 4 and 5 A. Davidson
0.4 10/17/07 Updated Figures 6 and 7 a. Davidson

ONET8501P-EV
11.3 GBPS RATE-SELECTABLE LIMITING AMPLIFIER – EVALUATION BOARD
Version 0.4 · October 2007
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www.ti.com
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