Microchip SY88903AL Handleiding

Microchip Niet gecategoriseerd SY88903AL

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3.3V, 1.25Gbps PECL High-Sensitivity
Limiting Post Amplifier with TTL
Loss-of-Signal
SY88903AL Evaluation Board
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2006
M9999-010406-B
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY88903AL high-sensitivity, limiting post amplifier
is designed for use in fiber-optic receivers. The device
connects to typical transimpedance amplifiers (TIAs).
The linear signal output from TIAs can contain
significant amounts of noise and may vary in
amplitude over time. The SY88903AL quantizes these
signals and outputs PECL-level waveforms.
The SY88903AL operates from a single +3.3V power
supply, over an industrial temperature range of –40°C
to +85°C. With its wide bandwidth and high gain
signals and with data rates up to 1.25Gbps, and as
small as 5mV
pp
, it can be amplified to drive devices
with PECL inputs.
The SY88903AL generates a high-gain, loss-of-signal
(LOS), open-collector, TTL output. The LOS function
has a high gain input stage for increased sensitivity. A
programmable loss-of-signal level set pin (LOS
LVL
)
sets the sensitivity of the input amplitude detection.
LOS asserts high if the input amplitude falls below the
threshold set by LOS
LVL
and de-asserts low otherwise.
The enable bar input (/EN) de-asserts the true output
signal without removing the input signal. The LOS
output can be fed back to the enable bar (/EN) input to
maintain output stability under a loss-of-signal
condition. Typically, 3.4dB LOS hysteresis is provided
to prevent chattering.
This manual provides information on the SY88903AL
evaluation board. It should be used in conjunction with
the SY88903AL data sheet, which contains full
specifications of the SY88903AL.
The SY88903AL evaluation board enables fast and
thorough evaluation of the SY88903AL. The board is
an easy-to-use, single supply design. It’s designed to
be driven by a high-speed, pattern generator and
provides onboard 50Ω terminations for the generator’s
outputs. The input termination network also provides
the required input bias of V
CC
–1.3V for the
SY88903AL.
The SY88903AL evaluation board is intended to
terminate to a 50Ω scope and provides for simple 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
• Single 3.3V supply
• DC-to-1.25Gbps operation
• Low-noise PECL data outputs
• High-gain LOS
Chatter-free open-collector TTL loss-of-signal
(LOS) output with internal 4.75kΩ pull-up resistor
• TTL /EN input
• Programmable LOS level set (LOS
LVL
)
• Available in a tiny 10-pin MSOP
• AC-coupled I/O with SMA connectors
• 50Ω input network termination
Related Documentation
• SY88903AL, 3.3V, 1.25Gbps PECL High-
Sensitivity Limiting Post Amplifier w/ TTL LOS Data
Sheet
Evaluation Board
Micrel, Inc. SY88903AL Evaluation Board
January 2006
2 M9999-010406-B
hbwhelp@micrel.com or (408) 955-1690
Measurement Setup
Equipment used for measurements:
1. Agilent 83752A Synthesized Sweeper
2. Agilent 70004A Display
3. Agilent 70843B Error Performance Analyzer
4. Agilent 86100A Wide-Bandwidth
Oscilloscope
5. Two (2) MCL BW S15W2 40dB Attenuators
6. Agilent E3620A DC Power Supply
7. Tektronix DMM157 Multimeter
8. Matched High-Speed Cables w/SMA
Connectors
Note:
Items 1 through 3 constitute the BERT stack
Figure 1. Setup for Measurement
Micrel, Inc. SY88903AL Evaluation Board
January 2006
3 M9999-010406-B
hbwhelp@micrel.com or (408) 955-1690
Setup for Measurements
This section explains how to connect and setup the
SY88903AL evaluation board, per Figure 1. Always
ensure that proper ESD precautionary measures are
taken before handling sensitive electronic equipment,
including the SY88903AL evaluation board.
1. Set E3620A output to 3.3V and then turn off
E3620A. Connect E3620A’s positive lead to
V
CC
post, negative lead to GND post.
2. Configure Agilent BERT stack:
a. Set the 83752A Synthesized Sweeper to
1.25GHz.
b. From the 70004A’s Pattern menu, choose
the PRBS 2
23
–1 pattern.
c. From the 70004A’s Trigger menu:
i. Choose clock as trigger output
ii. Choose CLK/8 for divider
d. From the 70004A’s Data menu:
i. External Termination = DC termination
0V
ii. Attenuation = 40dB
iii. Amplitude = 5mV
PP
iv. Hi-Level = 0V
v. Tracking = ON
vi. Polarity = NORMAL
vii. Data Output = ON
viii. Crossing = 0
3. Connect 70843V’s trigger output to
86100A’s trigger input.
4. Use J1 to short /EN to GND on SY88903AL
evaluation board.
5. Connect DIN and /DIN on SY88903AL
evaluation board to 70843V’s data outputs
through 40dB attenuators
a. Connect 40dB attenuators directly to the
board rater than the 70843V’s data outputs
to allow a larger and cleaner signal to pass
through the connecting SMA cables.
6. Connect DOUT and /DOUT on SY88903AL
evaluation board to 86100A’s inputs.
7. Set DMM157 to display voltage. Connect
positive lead to LOS header on J1 and
connect negative lead to GND.
8. Turn on E3620A. Typical power supply
current should be ~45mA, including the
SY88903AL’s current and current through the
on-board 130Ω output pull-down resistors at
3.3V supply voltage. Excessive current
usually means the power supply leads have
been connected backwards. Be careful of this!
9. To configure 86100A oscilloscope:
a. Verify a trigger signal is present by
checking that the Trigger Source button is
lit.
i. Depress this button to choose
external source if necessary.
ii. Adjust trigger level if necessary.
b. Press Eye/Mask Mode on front panel.
c. Choose NRZ Eye Measurements from
on-screen display.
d. Choose RMS Jitter, Rise Time, Fall Time
and Eye Amplitude measurements from
on-screen selection list.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: SY88903AL

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