Microchip SY88822V Handleiding

Microchip Niet gecategoriseerd SY88822V

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M9999-040804
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
The SY88822V features:
■Single 3.3V or 5V power supply
■Up to 155Mbps operation
■Modulation current to 30mA
■PECL output enable
■Dierential PECL inputs
■Available in a tiny 10-pin (3mm ××
××
×3mm) MSOP
The SY88822V evaluation board features:
■User adjustable potentiometer to adjust
modulation current
■50Ω equivalent input network termination
■AC-coupled I/O with SMA connectors
FUNCTIONAL FEATURES
5V/3.3V 155Mbps
LASER DIODE DRIVER
WITH OUTPUT ENABLE
SY88822V
EVALUATION BOARD
AVAILABLE MEASUREMENTS
■Frequency performance
■Output eye pattern generation
■Mask testing
■Jitter
■Output rise/fall time
■BER testing
Rev.: A Amendment: /0
Issue Date: April 8, 2004
The SY88822V is a high-speed current switch for driving
a semiconductor laser diode in optical transmission
applications. The modulation current (IOUT) is controlled by
the current (IRSET) through the external resistor RSET. The
output OUT is HIGH and no current ows through OUT
when output enable is HIGH.
The device incorporates complementary open-collector
outputs with a 30mA maximum current driving capability.
The external resistor REXT must be placed between /OUT
and VCC to dissipate the worst case power. RSER is
recommended to compensate for laser diode matching
issues. Pin 9 and pin 10 should be connected to achieve
better performance.
This manual provides information on the SY88822V
evaluation board. It should be used in conjunction with the
SY88822V datasheet, which contains full specications for
the SY88822V.
The SY88822V evaluation board enables fast and
thorough electrical evaluation of the SY88822V 155Mbps
laser diode driver with output enable. 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 on-board 50 equivalentΩ
terminations for the generator’s outputs. The input
termination network also provides the SY88822V's required
input bias of VCC–1.3V.
The board is intended to be terminated to a 50 scopeΩ
and provides for simple user adjustability of the modulation
current through the adjustment of an on-board potentiometer.
With the amplitude of the voltage waveform displayed on
the scope, the user can verify that the desired modulation
current is obtained through the equation: Imod(mA) =
Vamp(V)/ 0.025kΩ.
All data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
EVALUATION BOARD
Figure 1. SY88822V Evaluation Board
2
SY88822V Evaluation Board
Micrel
M9999-040804
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
V
EE
R4
125Ω
R5
20kΩ
R6
5.1kΩ
R1
125Ω
R2
83Ω
R3
83Ω
SMA
SMA
C7
22 Fµ
C6
0.1 Fµ
TRIGGER
OUT
J1
BLM21A102F
L1
Agilent 83752A
Synthesized Sweeper
RFOUT
CLOCK INPUT
DATA OUT
/DATA OUT
Agilent 70004A
Display
Agilent 70843B
Error Performance Analyzer
Agilent E3620A
Power Supply
R8
50Ω
R9
50Ω
3
4
5
2
/EN
DIN
/DIN
VREF
RSET VCC
GND
1
OUT
10
OUT
9
/OUT
9
7
6
SY88822V
C3
0.1 FµV
EE
GND
V
EE
Agilent 86100A
Wide-Bandwidth Oscilloscope
CH1 CH2
TRIGGER
IN
J2
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. Agilent E3620A DC Power Supply
6. Matched High-Speed Cables w/SMA Connectors
Note:
Items 1 through 3 constitute the BERT stack.
3
SY88822V Evaluation Board
Micrel
M9999-040804
hbwhelp@micrel.com or (408) 955-1690
SETUP FOR MEASUREMENTS
This section explains how to connect and setup the
SY88822V evaluation board per Figure 2. Ensure proper
ESD precautionary measures are taken before handling
sensitive electronic equipment, including the SY88822V
evaluation board itself.
1. Set E3620A to output 3.3V and then turn o
E3620A. Connect E3620A s positive lead to GND’
post and negative lead to VEE post. Note that the
board uses a negative supply; ensure that the
power supply polarity is correct.
2. 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 select:
i. External Termination = DC termination 0V
ii. Amplitude = 800mV (1600mVpp)
iii. Hi-Level = 0V
iv. Tracking = ON
v. Attenuation = 0dB
vi. Data Output = ON
vii. Polarity = NORMAL
viii. Crossing = 0
3. Connect 70843V’ ’s trigger output to 86100A s
trigger input.
4. Short J1; open J2 on SY88822V evaluation board.
5. Connect DIN and /DIN on SY88822V evaluation
board to 70843V s data outputs.’
6. Connect OUT and /OUT on SY88822V evaluation
board to 86100A s inputs.’
7. Turn on E3620A. Typical power supply current
should be ~48mA, including the SY88822V’s
current and current through the on-board 50Ω
equivalent termination network at 3.3V supply
voltage. Excessive current usually means the
power supply leads have been connected back-
wards. Be aware of this!
8. 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: SY88822V

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