Instrukcja obsługi Microchip SY88803V

Microchip nieskategoryzowany SY88803V

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1
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
The SY88803V features:
■Single 3.3V or 5V power supply
■Up to 155Mbps operation
■Low noise PECL data outputs
■Chatter-free TTL Loss-of-Signal (LOS) output
■TTL /EN input
■Programmable LOS level set (LOS LVL)
■Available in a tiny 10-pin MSOP (3mm ××××
×3mm)
package
The SY88803V evaluation board features:
■AC-coupled I/O with SMA connectors
■50Ω input network termination
FUNCTIONAL FEATURES
3.3V/5V 155Mbps PECL
LOW-POWER LIMITING
POST AMPLIFIER W/TTL LOS
SY88803V
EVALUATION BOARD
AVAILABLE MEASUREMENTS
■Frequency performance
■Output eye pattern generation
■Mask testing
■Jitter
■Output rise/fall time
■BER testing
■Hysteresis measurement
Rev.: A Amendment: /0
Issue Date: March 2004
The SY88803V low-power, 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 signicant amounts of noise
and may vary in amplitude over time. The SY88803V
quantizes these signals and outputs PECL level waveforms.
The SY88803V operates from a single +3.3V or +5V
power supply, over temperatures ranging from –40 C to°
+85°C. With its wide bandwidth and high gain, signals with
data rates up to 155Mbps and as small as 5mVpp can be
amplied to drive devices with PECL inputs.
The SY88803V generates a TTL LOS output. A
programmable, loss-of-signal, level set pin (LOSLVL) sets
the sensitivity of the input amplitude detection. LOS asserts
high if the input amplitude falls below the threshold set by
LOSLVL and de-asserts low otherwise. /EN de-asserts the
true output signal without removing the input signal. Typically
4.6dB loss-of-signal hysteresis is provided to prevent
chattering.
This manual provides information on the SY88803V
evaluation board. It should be used in conjunction with the
SY88803V datasheet, which contains full specications of
the SY88803V.
The SY88803V evaluation board enables fast and
thorough evaluation of the SY88803V 155Mbps PECL low-
power, limiting post amplier. The board is an easy-to-use,
single-layer, high-speed microstrip design. It is designed to
be driven by a high-speed, 155Mbps pattern generator and
provides onboard 50 terminations for the generator’sΩ
outputs. The input termination network also provides the
required input bias of VCC–1.3V for the SY88803V.
The SY88803V evaluation board is intended to be
terminated to a 50 scope and provides for simple userΩ
adjustability of the LOS threshold through the adjustment of
an on-board potentiometer. This allows the user to evaluate
various parameters of the SY88803V, as listed in the
"Available Measurements" section of this document.
All data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
EVALUATION BOARD
Figure 1. SY88803V Evaluation Board
2
SY88803V Evaluation Board
Micrel
hbwhelp@micrel.com or (408) 955-1690
MEASUREMENT SETUP
SMA
SMA C2
0.1 Fµ
C1
0.1 Fµ
C5
0.1 Fµ
C4
0.1 Fµ
C6
0.1 Fµ
VCC
VCC
R3
20kΩ
Trimpot
R2
50Ω
R6
5.1kΩ
R1
50Ω
SMA
SMA
C8
22 Fµ
C7
0.1 Fµ
TRIGGER
OUT
Header Pins J1
BLM21A102F
FB1
Agilent 83752A
Synthesized Sweeper
RFOUT
CLOCK INPUT
DATA OUT
/DATA OUT
Agilent 70004A
Display
Agilent 70843B
Error Performance Analyzer
Agilent E3620A
Power Supply
Tektronix
DMM157
R5
200Ω
R4
200Ω
3
4
5
2
/EN
/EN
LOS
DIN
/DIN
VREF
LOSLVL GND
LOS
11
2
3
VCC
10
DOUT
9
/DOUT
8
7
6
SY88803V
VCC
VCC
GND
Agilent 86100A
Wide-Bandwidth Oscilloscope
CH1 CH2
TRIGGER
IN
Figure 2. Setup for Measurements
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.
3
SY88803V Evaluation Board
Micrel
hbwhelp@micrel.com or (408) 955-1690
SETUP FOR MEASUREMENTS
This section explains how to connect and setup the
SY88803V evaluation board per Figure 2. Ensure proper
ESD precautionary measures are taken before handling
sensitive electronic equipment, including the SY88803V
evaluation board.
1. Set E3620A to output 3.3V and then turn o E3620A.
Connect E3620A s positive lead to V’CC post,
negative lead to GND post.
2. To configure Agilent BERT stack:
a) Set the 83752A Synthesized Sweeper to 155MHz
b) From the 70004A’s Pattern menu, choose the
PRBS 231–1 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 (10mVpp)
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 SY88803V evaluation
board.
5. Connect DIN and /DIN on SY88803V evaluation
board to 70843V s data outputs through 40dB’
attenuators.
a) Connect 40dB attenuators directly to the board
rather 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 SY88803V 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 SY88803V s current and’
current through the on-board 200 output pulldownΩ
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.

Specyfikacje produktu

Marka: Microchip
Kategoria: nieskategoryzowany
Model: SY88803V

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