Microchip SY88303BL Handleiding

Microchip Niet gecategoriseerd SY88303BL

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SY88303BL Evaluation Board
3.3V, 3.2Gbps CML Limiting Post Amplifier
with Wider Loss-of-Signal Detection Range
MLF is a registered trademark of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-500 • http://www.micrel.com
October, 2007
M9999-101507-A
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY88303BL evaluation board enables fast and
thorough evaluation of the SY88303BL CML Lomiting
Post Amplifier. The board is an easy-to-use, single
supply design, designed to be driven by a high-
speed, pattern generator.
The SY88303BL evaluation board is intended to
terminate to a 50 scope and provides for simpleΩ
user adjustability of the LOS threshold through the
adjustment of an on-board potentiometer.
All datasheets and support documentation can be
found on Micrel’s web site at: .www.micrel.com
Features
• SY88303BL CML limiting post amplifier with wider
loss-of-signal detection range
• Single +3.3V power supply
• AC-coupled configuration for direct interface with 50Ω
test equipment
• On-board LOS sensitivity adjustment
Related Documentation
• SY88303BL datasheet: 3.3V, 3.2Gbps CML Limiting
Post Amplifier with Wider Loss-of-Signal Detection
Range
___________________________________________________________________________________
Evaluation Board
Micrel, Inc. SY88303BL Evaluation Board
October, 2007 M9999-101507-A
hbwhelp@micrel.com or (408) 955-1690
2
Evaluation Board Description
The SY88303BL 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 automatically bias the input
levels to the correct DC-operating point set by the VREF
jumper input. Therefore, the inputs can be driven by a
differential signal smaller than 100mV (200mVPP )
without level-shifting or termination resistor network in
the signal path.
AC-Coupled Output
The SY88303BL is configured with AC-coupled outputs
allowing the board to interface directly with 50Ω
equipment. AC-coupling allows the board to use a
single power supply. If only one output is being used,
the unused complimentary output should be terminated
into 50 -to-ground.Ω
SY88303BL AC-Coupled Evaluation Board Setup
This section explains how to connect and setup the
SY88303BL evaluation board per Figure 1. Ensure
proper ESD precautionary measures are taken before
handling sensitive electronic equipment, including the
SY88303BL evaluation board.
Measurements
Evaluating DOUT and /DOUT
1. Set a DC power supply to +3.3V and turn it off.
Connect the positive lead to VCC post and the
negative lead to GND post.
2. Set the desired frequency on a pattern generator
with amplitude between 10mVPP and 1800mVPP
.
Typical data patterns are 27-1 or 223-1 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 VCC.
3. Connect the pattern generator with differential
outputs as a data source to the DIN and /DIN inputs
on the SY88303BL evaluation board. Use matched-
length differential cables.
4. Turn the power supply on.
5. Observe the DOUT and /DOUT outputs with a 50Ω
scope. The output rise and fall times should be less
than 120ps, with an amplitude around 800mV
differentially.
LOS Hysteresis Measurements
The SY88303BL evaluation board provides a
potentiometer to allow for convenient adjustment of
LOSLVL without the need for an extra power supply.
LOSLVL taps off a potentiometer connected between VCC
and VREF. VREF is a reference voltage of approximately
VCC -1.3V. Hence, LOS LVL can be set to any voltage
between VCC and V CC
-1.3, as specified in the
SY88303BL data sheet. The potentiometer creates a
voltage divider. Thus,
( )
( )( )





Ω+Ω
Ω×
−=kkR
kR
VLOS CCLVL 8.2
3.1
Where: R is the resistance of the potentiometer VAR1
from V CC to the tap at LOSLVL. The steps below show
how to measure the LOS hysteresis as a function of the
input voltage swing at the DIN and /DIN inputs:
Minimum Input Swing Hysteresis Measurement
The optimal input signal range to trigger the LOS assert
function is between 20mVpp and 100mVpp. For more
information, please see the SY88303BL Datasheet.
1. Set a DC power supply to +3.3V and turn it off.
Connect the positive lead to VCC post and the
negative lead-to-GND post.
2. Connect a DMM or similar voltage measurement
device between the LOSLVL pin and VCC.
3. Connect a second DMM or similar voltage
measurement device between the LOS output and
GND. For the remainder of this document, this
DMM will be referred to as the LOS DMM.
4. Connect the pattern generator with differential
outputs as a data source to the DIN and /DIN inputs
on the SY88303BL evaluation board. Use matched-
length differential cables.
5. Turn the power supply on.
6. Adjust the trimpot VAR1 so the voltage at the
LOSLVL pin is around 1.3V below VCC. This sets the
LOS for maximum sensitivity. At this level, the LOS
output should go HIGH or LOW (measured with the
LOS DMM set up in step 3) as the input voltage
swing at DIN and /DIN is varied around 20mVPP.
The input voltage at which the LOS output goes
HIGH or LOW is the LOS assert voltage or LOS de-
assert voltage, respectively.
7. Now adjust the trimpot is to vary the voltage so it is
closer to VCC. Note that as the voltage at the LOSLVL
pin approaches VCC, a larger input voltage swing is
required to trigger assert and de-assert levels. On
the contrary, as the LOS LVL voltage moves away
from V CC
, assert and de-assert levels are triggered
by input voltage swings as small as 20mVPP.
Micrel, Inc. SY88303BL Evaluation Board
October, 2007 M9999-101507-A
hbwhelp@micrel.com or (408) 955-1690
3
8. The hysteresis between assert and de-assert levels
can be calculated with the following equation:
Hysteresis (dB) = 20 l og (LOS De-assert
voltage/LOS Assert voltage). This hysteresis should
be >2dB.
Evaluation Board Layout
The evaluation boards are constructed with Rogers
4003 material, are coplanar in design, fabricated to
minimize noise, achieve high bandwidth, and minimize
crosstalk.
L1
L2
L3
L4
Table 1. Layer Stack
Figure 1. Setup for Measurement
(MSOP Package).

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: SY88303BL

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