Microchip SY88353BL Manual

Microchip Ikke kategoriseret SY88353BL

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Side 1/7
SY88353BL Evaluation Board
3.3V, 3.2Gbps Limiting Post Amplifier with
Programmable Decision Threshold
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2007
M9999-052207-B
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY88353BL evaluation board enables fast and
thorough evaluation of the SY88353BL post amplifier.
It provides a unique pin (VTHP) at which a variable
DC signal can be applied to adjust the output signal
crossing from 20 to 80%. This feature eliminates input
DC offsets in DC-coupled applications, minimizes
jitter caused by duty cycle distortion, and ultimately
optimizes bit error rate (BER) performance. The
board is an easy-to-use, single-supply design,
designed to be driven by a high-speed, pattern
generator.
The SY88353BL evaluation board is intended to
terminate to a 50 scope and provides for simple
user adjustability of the LOS threshold through the
adjustment of an on-board potentiometer as well as
simple evaluation of the output signal crossings.
All data sheets and support documentation can be
found on Micrel’s web site at: www.micrel.com.
Features
• SY88353BL CML Low-Power Limiting Post Amplifier
with TTL LOS
• Single +3.3V power supply
• AC-coupled configuration for direct interface with
50 test equipment and easy evaluation of device.
• On-board LOS sensitivity adjustment
• On-board LOS-feedback variable resistor for higher
hysteresis adjustment.
• On-board output crossing adjustment
Related Documentation
SY88353BL: 3.3V, 3.2Gbps Limiting Post Amplifier with
Programmable Decision Threshold
____________________________________________________________________________________
Evaluation Board
Micrel, Inc.
SY88353BL Evaluation Board
May 2007
M9999-052207-B
hbwhelp@micrel.com or (408) 955-1690
2
Evaluation Board Description
The SY88353BL evaluation board is designed to
operate with a single 3.3V ±10% power supply and is
configured with AC-coupled inputs and outputs. The
high-speed input and output channels are brought out
to SMA connectors through matched-length AC-coupled
differential strip-line traces.
AC-Coupled Input
The AC-Coupled inputs bias the input levels to a DC-
operating point that is either set to a fixed voltage,
which is a diode-drop below Vcc, to get 50% output
crossing or is varied by applying a DC voltage between
0V-2.5V at VTHP pin to adjust output crossings. Inputs
can be driven by a differential signal with amplitude
typically between 10mV
PP
-1800mVpp.
AC-Coupled Output
The SY88353BL is configured with AC-coupled outputs
allowing the board to interface directly with 50Ω
equipment. If only one output is being used, the unused
complimentary output should be terminated into 50Ω-to-
ground.
The following sections explain how to connect and
setup the SY88353BL evaluation board per Figure 1.
Ensure proper ESD precautionary measures are taken
before handling sensitive electronic equipment,
including the SY88353BL evaluation board.
Measurements
Evaluating DOUT & /DOUT
1. Set a DC power supply to +3.3V and turn it off.
Connect the positive lead to V
CC
post and the
negative lead to GND post.
2. Set the desired frequency on a pattern generator
with an amplitude between 10mV
PP
and 1800mV
PP
.
Typical data patterns are 2
7
-1 or 2
23
-1 PRBS
patterns depending upon the application. Since the
inputs to the board are AC-Coupled, the voltage
offset of the pattern generator is not significant so it
can be set between GND and V
CC
.
3. Connect the pattern generator with differential
outputs as a data source to the DIN and /DIN inputs
on the SY88353BL evaluation board. Use matched-
length differential cables.
4. For normal output (output crossing adjustment not
need), connect VTHN and VTHP to ground.
5. For crossing adjustment, place a jumper across
VTHN and VREF and apply a DC signal between 0-
2.5V at VTHP. Crossings can be varied from 20%
to 80%, reaching 50% when VTHP centers at
around 1.25V.
6. Place jumper across EN/ and GND to enable the
outputs.
7. Turn the power supply on.
8. Observe the DOUT and /DOUT outputs with a 50Ω
scope. The output rise and fall times should be less
than 100ps, with an amplitude around 400mV
(800mV
PP
differential).

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: SY88353BL

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