SY88932L
3.3V, 4.25Gbps SONET/SDH Laser Driver
with Output Disable
General Description
The SY88932L is the smallest available laser driver with a
programmable modulation current up to 60mA for Fabry-
Perot (FP) or distribution feedback (DFB) lasers. The
device is suitable for SOENT/SDH applications with data
rates up to 4.25Gbps. The SY88932L accepts either CML
level or AC-coupled PECL inputs, and incorporates an
active low TTL /EN function which shuts off the modulation
current when HIGH.
Datasheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
Up to 4.25Gbps operation
Modulation current to 60mA
Rise/fall times 65ps typical
Input 50Ω
internally terminated to VCC
TTL /EN with internal 75kΩ
pull-down
Designed for use with MIC3000 optical transceiver
management IC
Voltage programmable laser modulation current
Single 3.3V power supply
Operating temperature range of –40°C to +85°C
Available in tiny 16-pin QFN package
Applications
•
•
•
•
•
•
•
Fiber optical module
Transponder
XAUI CWDM
SONET/ SDH transmission system
Add-drop MUX
Metro area network
4.25Gbps optical transmitter
___________________________________________________________________________________________________________
Block Diagram
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2008
M9999-022008-F
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88932L
Ordering Information
Part Number
SY88932LMI
SY88932LMITR
SY88932LMG
SY88932LMGTR
Note:
1. Tape and Reel.
(1)
(1)
Package
Type
QFN-16
QFN-16
QFN-16
QFN-16
Operating
Range
Industrial
Industrial
Industrial
Industrial
Package Marking
932L
932L
932L with
Pb-Free bar-line indicator
932L with
Pb-Free bar-line indicator
Lead
Finish
Sn-Pb
Sn-Pb
Pb-Free
NiPdAu
Pb-Free
NiPdAu
Pin Configuration
16-Pin QFN
February 2008
2
M9999-022008-F
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88932L
Pin Description
Pin Number
2, 3
1, 4, 7, 8, 13
5, 6
9, 10, 11, 12
14
15
16
Pin Name
DIN, /DIN
GND
VCC
OUT, /OUT
VREF
VCNTRL
/EN
Pin Function
NRZ differential data (inputs), CML terminated interface with 50Ω
to V
CC
.
Ground.
Positive power supply.
Open collector (outputs) from the modulation driver.
Voltage reference, nominally 1.25V with respect to ground.
Voltage control of I
MOD
. 5kΩ input impedance. See “Typical Operating Characteristics.”
Enable: TTL-compatible active low input with 75kΩ
pull-down
resistor.
Truth Table
(1,2)
D
L
H
X
Notes:
1. Truth table parameters are given for voltage rather than optical outputs. Hence, a voltage HIGH and OUT means no modulation current is
flowing through OUT, and a voltage LOW on OUT means modulation current is flowing through OUT. A voltage LOW implies an optical
HIGH, and vice versa.
2. L = LOW, H = HIGH, X = don’t care.
3. I
OUT
≤ I
MOD_OFF
when /EN is HIGH.
/D
H
L
X
/EN
L
L
H
OUT
H
L
H
(3)
/OUT
L
H
L
February 2008
3
M9999-022008-F
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88932L
Absolute Maximum Ratings
(1)
Supply Voltage (V
CC
) .................................... –0.5V to +4.0V
CML Input Voltage (V
IN
) ..................V
CC
–1.0V to V
CC
+0.5V
TTL Control Input Voltage (V
IN
) ............................. 0V to V
CC
Lead Temperature (soldering, 20sec.) ....................... 265°C
Storage Temperature (T
s
) ......................... –65°C to +150°C
Operating Ratings
(2)
Supply Voltage (V
CC
) .................................... +3.0V to +3.6V
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Junction Temperature (T
J
) ........................ –40°C to +120°C
(3)
Junction Thermal Resistance
QFN
(θ
JA
) Still-Air ....................................................... 61°C/W
(ψ
JB
) Still-Air ....................................................... 38°C/W
DC Electrical Characteristics
V
CC
= 3.0V to 3.6V; GND = 0V; T
A
= –40°C to +85°C, Typical values at V
CC
= 3.3V, T
A
= 25°C.
Symbol
I
CC
I
MOD
I
MOD_OFF
V
IR
V
ID
V
IHEN
V
ILEN
V
OUT
V
REF
Notes:
1. Permanent device damage may occur is Absolute Maximum Ratings are exceeded. This is a stress rating only and functional operation is not implied
at conditions other than those detailed in the operational sections of this datasheet. Exposed to Absolute Maximum Ratings conditions for extended
periods may affect device reliability.
2. The device is not guaranteed to function outside its operating rating.
3. Thermal resistance numbers are 4-layer PCB. Thermal performance assumes exposed pad is soldered (or equivalent) to the same potential as the
ground pins on the PCB.
4. Excluding I
MOD
. I
MOD
set to 60mA with 25Ω
load to V
CC
on OUT, /OUT. Inputs floating.
5. V
ID
is the voltage required to guarantee a stable logic level. For logic “1”, D
IN
must be V
ID
/2 above /D
IN
. For stable logic “0”, D
IN
must be V
ID
/2 below
/D
IN
.
6. OUT and /OUT are current outputs. This specification defines the voltage range that the user must guarantee these pins remain within for proper
operation.
7. V
REF
intended to source/sink
≤ |5mA|.
Parameter
Power Supply Current
Modulation Current Range
Modulation Off Current
CML Input Voltage Range
CML Input Differential Voltage
(D
IN
, /D
IN
)
TTL Input HIGH Voltage (/EN)
TTL Input LOW Voltage (/EN)
Voltage (OUT, /OUT)
Reference Voltage
Condition
Note 4
Min
10
Typ
57
Max
80
60
200
V
CC
+0.4
Units
mA
mA
µA
V
mV
PP
V
/EN = V
IHEN
V
CC
–0.8
Note 5
400
2.0
800
1600
0.8
Note 6
Note 7
V
CC
–1.5
1.2
1.25
V
CC
1.3
V
V
V
February 2008
4
M9999-022008-F
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY88932L
AC Electrical Characteristics
(8)
V
CC
= 3.0V to 3.6V; GND = 0V; T
A
= –40°C to +85°C, Typical values at V
CC
= 3.3V, T
A
= 25°C.
Symbol
t
r,
t
f
DJ
Notes:
8. AC characteristics are guaranteed by design and characterization.
9. I
MOD
= 60mA.
10. Deterministic jitter measured using K28.5 pattern of 2.486Gbps, V
ID
= 1600mV
PP
.
Parameter
Output Rise/Fall Times
(20% to 80%)
Deterministic Jitter
Condition
Note 9
Note 9, 10
Min
Typ
65
20
Max
100
Units
ps
ps
PP
Typical Operating Characteristics
February 2008
5
M9999-022008-F
hbwhelp@micrel.com
or (408) 955-1690
PCB设计
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