Microchip SY88952L Bruksanvisning

Microchip Inte kategoriserad SY88952L

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1
M9999-061704
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
The SY88952L features:
■Multirate up to 2.7Gbps operation
■Rise/fall times <75ps
■Independently programmable laser modulation and
bias currents
■Bias current to 100mA and modulation current to 90mA
■Automatic average laser power control
■Bias and modulation current monitors
■Complies with ANSI, ITU, and Bellcore SDH/SONET
specifications
■3.3V power supply; wide temperature operating range
The SY88952L evaluation board features:
■DC-coupled inputs and outputs with SMA connectors
■50Ω input network termination
■Potentiometers to adjust modulation and bias currents
■MD emulator to test APC functionality
FUNCTIONAL FEATURES
3.3V, 2.7Gbps SDH/SONET
LASER DRIVER WITH
AUTOMATIC POWER CONTROL
SY88952L
EVALUATION BOARD
Rev.: A Amendment: /0
Issue Date: June 2004
The SY88952L is a highly integrated and programmable
laser driver for SONET/SDH applications up to 2.7Gbps.
The device accepts dierential PECL data and clock inputs.
It provides programmable bias and modulation currents for
driving a laser. The modulation output of the SY88952L can
be DC-coupled to drive the laser diode, providing significant
power savings over AC-coupled operation.
An automatic power controller (APC) is integrated into
the SY88952L to maintain a constant average optical output
power over temperature and lifetime. The moduation current
can be externally temperature compensated to minimize
the variation of the extinction ration of the optical output.
This manual provides information on the SY88952L
evaluation board. It should be used in conjunction with the
SY88952L data sheet, which contains full specications of
the SY88952L.
The SY88952L evaluation board enables fast and
thorough evaluation of the SY88952L 2.7Gbps SDH/SONET
laser driver with automatic power control. The board is an
easy-to-use, 4-layer high-speed coplanar design that uses
Rogers 4003 dielectric material to achieve high bandwidth.
The layer stack is shown in Table 1.
The SY88952L evaluation board is designed to be driven
by a high-speed 2.7Gbps pattern generator and is intended
to be terminated to a 50 scope. This allows the user toΩ
evaluate various parameters of the SY88952L, 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.
Layer Definition
1 Signal/GND
2 GND
3 VEE
4 GND
Table 1. SY88952L Evaluation
Board Layer Stack-Up
AVAILABLE MEASUREMENTS
The SY88952L evaluation board allows the following
measurements:
■Frequency performance
■Output eye pattern generation
■Mask testing
■Jitter
■Output rise/fall time
■BER testing
■APC functionality
EVALUATION BOARD
Figure 1. SY88952L Evaluation Board
2
SY88952L Evaluation BoardMicrel
M9999-061704
hbwhelp@micrel.com or (408) 955-1690
MEASUREMENT SETUP
C5
220pF
S6
S5
VCC
D
/D
VCC
CLK
/CLK
VCC
LATCH
VCC
/Q
/Q
VCC
Q
Q
VCC
VEE
VEE
VEE
MODSET
BIASMAX
VCC
VEE
SLOW
MD
/FAIL
MODMON
BIASMON
VEE
EN
VEE
VEE
BIAS
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
9 10 11 12 13 14 15 16
32 31 30 29 28 27 26 25
U1
S88952L
2
1
V
EE
V
EE
TP1 TP2
C6
0.1µF
C7
220pF
V
EE
C8
0.1µF
R10
130Ω
R9
130Ω
TP3
D1
LED
R11
130Ω
C9
220pF
V
EE
C10
0.1 F
R12
20Ω
L2
Optional
R15
20Ω
L3
Optional R14
0Ω
R11
0Ω
Repla R14 C12ce by
f r o AC-c u go plin
Repla R13 C11ce by
f r o AC-c u go plin
2
1
3
C16
0.1 F
TP5
TP4
V
EE
C13
220pF C14
0.1 F
V
EE
R16
10Ω
C17
220pF
C18
0.1 F
V
EE
TP6
V
EE
V
EE
VAR2
50k
VAR3
50k
TP7
C19
0.1 F
C20
0.1 F
JP1
R1
50Ω
2
1
V
EE
JP2
R3
50Ω
R5
50Ω
R7
50Ω
C1
C2
C3
C4
A ilg ent 86100A
Wi Ban opde- dwi td h Oscillosc e
CH1 CH2
TRI ERGG
IN
A ilg ent 83752A
S i S pynthes zed wee er
RFOUT
CLOCK INPUT
DATA OUT
/DATA OUT
A il ntg e 70004A
Di plas y
A ilg ent 70843B
E o P orr r erf rmance Analyzer
A ilg ent E3620A
Po pplwer Su y
R17
1.5kΩ
R18
0Ω
U2
MIC7300
R19
130Ω
VAR1
50kQ1
PNP
JP3
C15
0.1 F
C30
0.1 F
C31
10 F
TP8
C32
1 F
Optional
L1
Optional BP1
V
EE
Connector
BP2
V
CC
Connector
S1
S2
S3
S4
6 Bd
6 Bd
TRI ERGG
OUT
0Ω
0Ω
0Ω
0Ω
V
EE
Figure 2. Setup for Measurements
E ip nt o a ntqu me used f r me sureme s:
1. Ag e y hes zed wee eril nt 83752A S nt i S p
2. Ag e s yil nt 70004A Di pla
3. Ag e rr r erf rm ce yzeril nt 70843B E o P o an Anal
4. Ag e il nt 86100A Wide- dw d h sc sc eBan i t O illo op
5. Tw ) d e u rso (2 MCL BW S15W2 6 B Att n ato
6. Ag e wer u yil nt E3620A DC Po S ppl
7. Tek r x u me ert oni DMM157 M lti t
8. Matched gh- eed b ec rsHi Sp Ca les w/SMA Conn to
Note:
It 1 t o 3 on tit t t BERT ta .ems hr ugh c s u e he s ck
4
SY88952L Evaluation BoardMicrel
M9999 061704-
hbwhe @m cre c m ) -lp i l. o or (408 955 1690
MEASUREMENTS
T S 88952L al ationhe Y ev u boa a t o ard ssumes he use f
50 op to t inat t S 88952L. T i in pa all l itΩ sc e erm e he Y h s, r e w h
t on oa 20 o tp t p ll p i to at a 14.3he -b rd Ω u u u -u res s rs, cre es Ω
o tp t loa . T nt pa in t o t i loa atu u d he curre ss g hr ugh h s d cre es
a volta in to io ange sw g used measure var us perform ce
pa a t o t S 88952L. T i o lation nt ir me ers f he Y h s m du curre s
a ta l t o t o pot ntio t VAR2. Tdjus b e hr ugh he use f e me er he
b b w gia nts curre is adjusta le through VAR3. The follo in
sections detail va io a nt t at t S 88952Lr us me sureme s h he Y
ev u rd wsal ation boa allo .
1. Eye er er c ud er se fpatt n gen ation in l ing jitt and ri / all
times:
a. Adjus g ve (t VAR2 to i 1.29V 2.58Vpp) u uo tp t
a plit Im ude ( MOD = m = k )90 A 1.29V/0.014 Ω.
VAR2 o l app o i at l 100 . T sh u d be r x m e y Ω he
po ppl n to t n o to t awer su y eeds be ur ed ge
c rrec d g f he e me s-o t rea in o t pot ntio ter’s resi
tance.
b. Adjus ve cr ss t VAR3 to gi 1V drop a o R16
(IBIAS = = sh100 Am1V/0.010 . VAR3k )Ω o lu d
be r x m e y he yapp o i at l 100 .ΩT power suppl
n to t n o to t a o t a ineeds be ur ed ge c rrec re d g
o t pot ntio t i tan .f he e me er’s res s ce
c. Press u sc e sc sc e he eyeA to al on o illo op . T
patt n o l a to ati all i pla on ter sh u d u m c y d s y he
sc e f , ver fy he s e s s ed heop . I not i t t p li t in t
“ e u f r e sureme s” sec re c m-S t p o M a nt tion a o
pl t . So ti t a o n toe ed me mes he w vef rm eeds be
m u y djus ed s y se hean all a t to fit the di pla . U t
Ti S al an Volta S al no on tme c e d ge c e k bs he
fr e f e djus h sont pan l o the scop to a t t i .
d. Observe me e’s da nt onsureme s scop i pla .s y
T i an all ti o l l t anhe r se d f mes sh u d be ess h
75p a plit a o n 1.29V an itt a o ns, m ude r u d d j er r u d
10psrms.
e. Adjus d dut VAR2 an VAR3 for desired mo lation
an ia nt an p at a o . End b s curre s d re e b ve sure
t ia an o lation nt a not t tohe b s d m du curre s re se
dr re h m d m ec-ive mo t an 100 A an 90 A resp
ti l ot i t S 88952L ill t o nve y, herw se he Y w shu d w
all o tp t nt an t ill no o tp t u u curre s, d here w be u u
swing.
TIME / i (100ps d v.)
OUTPUT 200 V/ i ( m d v.)
Figure 3. Typical SY88952L Electrical Output
at 2.5Gbps, 231–1 PRBS, IMOD = 45mA, 3.3V @ 25°C
2. Mask es g:t tin
a. Press ye sk E /Ma Mode e eon front pan l of scop .
b. Ch se sk es m -scree s yoo Ma T ting fro on n di pla .
c. Ch se e sk fr -scree se ecoo Op n Ma om on n l tion
li t.s
i. S l t an op n t OC 48 a .e ec d e he - m sk
d. Ch se r sk es -screeoo Sta t Ma T ting from on n
se ec s vef u d u m c yl tion li t. Wa orm sho l a to ati all
d s h r r s di play wit app op iate mask region an
t tin ill ta t. I not i t t p li tes g w s r f , ver fy he s e s s ed
in t S t p o M a nt tion a he “ e u f r e sureme s” sec re
c m eo pl ted.

Produktspecifikationer

Varumärke: Microchip
Kategori: Inte kategoriserad
Modell: SY88952L

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