Microchip SY88403BL Manual de Usario

Microchip No categorizado SY88403BL

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SY88403BL Evaluation Board
3.3V, 4.25Gbps CML Limiting Post Amplifier
with TTL LOS
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2006
M9999-031006-A
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY88403BL evaluation board enables fast and
thorough evaluation of the SY88403BL. The board is
an easy-to-use, single supply design, designed to be
driven by a high-speed, pattern generator.
The SY88403BL 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 data sheets and support documentation can be
found on Micrel’s web site at: www.micrel.com.
Features
• SY88403BL CML Limiting Post Amplifier with High-
Sensitivity TTL LOS
• Single +3.3V power supply
• AC-coupled configuration for direct interface with 50Ω
test equipment
• On-board LOS sensitivity adjustment
Related Documentation
• 3.3V, 4.25Gbps CML Limiting Post Amplifier with High-
Sensitivity TTL LOS.
Evaluation Board
Micrel, Inc. SY88403BL Evaluation Board
March 2006 M9999-031006-A
hb h l @ i l (408) 955 1690
2
Evaluation Board Description
The SY88403BL 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 VT
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 SY88403BL 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
SY88403BL AC-Coupled Evaluation Board Setup
This section explains how to connect and setup the
SY88403BL evaluation board per Figure 1. Ensure
proper ESD precautionary measures are taken before
handling sensitive electronic equipment, including the
SY88403BL 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. Connect the /EN input to the GND to enable the
DOUT and /DOUT output buffers.
3. Set the desired frequency on a pattern generator
with an amplitude between 20mVPP and 1800mVPP
.
Typical data patterns are 27-1 or 223-1 PRBS
patterns depending on 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.
4. Connect the pattern generator with differential
outputs as a data source to the DIN and /DIN inputs
on the SY88403BL evaluation board. Use matched
length differential cables.
5. Turn the power supply on.
6. 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 400mV
(800mVPP differential).
LOS Hysteresis Measurements
The SY88403BL 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, LOSLVL can be set to any voltage
between VCC and VCC-1.3, as specified in the
SY88403BL data sheet. The potentiometer creates a
voltage divider. Thus,
Where R is the resistance of the potentiometer 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 minimum acceptable input swing for the
SY88403BL is 20mVPP.
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 the /EN input to the GND to enable the
DOUT and /DOUT output buffers.
3. Connect a DMM or similar voltage measurement
device between the LOSLVL pin and VCC.
4. 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.
5. Connect the pattern generator with differential
outputs as a data source to the DIN and /DIN inputs
on the SY88403BL evaluation board. Use matched
length differential cables.
6. Turn the power supply on.
7. 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 4) as the input voltage
swing at DIN and /DIN is varied around 5mVPP.
8. 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 the assert and deassert levels,
while as the LOSLVL
voltage moves away from V CC
the assert and de-assert levels are triggered by
input voltage swings as small as 5mVPP .
9. The hysteresis between the assert and de-assert
levels can be calculated with the following equation:
Hysteresis (dB) = 20log (LOS de-assert voltage/LOS
assert voltage). This hysteresis should be >2dB.
Micrel, Inc. SY88403BL Evaluation Board
March 2006 M9999-031006-A
hb h l @ i l (408) 955 1690
3
Evaluation Board Layout
The evaluation boards are constructed with Rogers
4003 material and are coplanar in design, fabricated to
minimize noise, achieve high bandwidth and minimize
crosstalk.
L1
GND and Signal
L2
GND
L3
VCC
L4
GND
Table 1. Layer Stack
Figure 1. Setup for Measurement

Especificaciones del producto

Marca: Microchip
Categoría: No categorizado
Modelo: SY88403BL

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