1
SY88912L
Micrel, Inc.
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
The SY88912L is the smallest laser driver with
programmable modulation current for SONET/SDH
applications up to 3.2Gbps. The device accepts either
PECL or CML level data inputs. The SY88912L provides
modulation current of up to 60mA for FP (Fabry-Perot) or
DFB (Distributed Feedback) laser.
There is a 75k
pull-down resistor to V
EE
at the input of
/EN. An active low PECL enable signal shuts off modulation
current.
FEATURES
DESCRIPTION
SY88912L
3.3V 3.2Gbps SONET/SDH
LASER DRIVER
s
Up to 3.2Gbps operation
s
Modulation current to 60mA
s
Rise/Fall times <70PS
s
Single 3.3V power supply
s
Programmable laser modulation current
s
Operating temperature range of 40
C to 85
C
s
Available in tiny 16-pin MLFTM package
Rev.: B
Amendment: /0
Issue Date:
August 2005
APPLICATIONS
s
Fiber optical module
s
Transponder
s
XAUI CWDM
s
SONET/SDH transmission system
s
Add-drop mux
s
Metro area network
s
2.5Gbps optical transmitter
BLOCK DIAGRAM
D
IN
/D
IN
/EN
Internal
Logic
BIAS
Control
V
REF
R
SET
R
SET
I
MOD
GND
V
CC
OUT
/OUT
R
EXT
V
CC
GND
I
BIAS
V
CC
V
CC
MLF and
Micro LeadFrame are trademarks of Amkor Technology, Inc.
2
SY88912L
Micrel, Inc.
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
PACKAGE/ORDERING INFORMATION
13
14
15
16
12
11
10
9
1
2
3
4
8
7
6
5
DIN
GND
GND
/DIN
OUT
OUT
/OUT
/OUT
VCC
/EN
GND
GND
VCC
VREF
RSET
GND
16-Pin MLFTM (MLF-16)
Ordering Information
Package
Operating
Package
Lead
Part Number
Type
Range
Marking
Finish
SY88912LMI
MLF-16
Industrial
912L
Sn-Pb
SY88912LMITR
(1)
MLF-16
Industrial
912L
Sn-Pb
SY88912LMG
MLF-16
Industrial
912L with
Pb-Free
Pb-Free bar-line indicator
NiPdAu
SY88912LMGTR
(1)
MLF-16
Industrial
912L with
Pb-Free
Pb-Free bar-line indicator
NiPdAu
Note:
1.
Tape and Reel.
Pin
Function
D
IN
, /D
IN
NRZ differential data inputs.
/EN
PECL compatible active low input.
GND
Most negative power supply input.
OUT, /OUT
Open collector outputs from the modulation
driver.
R
SET
An external resistor between V
REF
and R
SET
defines the modulation current.
V
CC
Most positive power supply input.
V
REF
Voltage reference for use with R
SET
.
PIN NAMES
D
/D
/EN
OUT
(2)
/OUT
L
H
L
H
L
H
L
L
L
H
X
X
H
H
L
TRUTH TABLE
(1)
Notes:
1. L = LOW, H = HIGH, X = don't care.
2. I
OUT
I
MOD_OFF
when /EN is HIGH.
3
SY88912L
Micrel, Inc.
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
Symbol
Parameter
Value
Unit
V
CC
Power Supply Voltage
0 to +5.0
V
V
IN
Input Voltage
0 to V
CC
V
I
OUT
Output Current
65
mA
T
store
Storage Temperature
55 to +125
C
T
A
Operating Temperature
40 to +85
C
P
D
Power Dissipation
500
mW
JA
(2)
Package Thermal Resistance
Still-Air
59
C/W
(Junction-to-Ambient)
JB
Package Thermal Resistance
32.1
C/W
(Junction-to-Board)
ABSOLUTE MAXIMUM RATINGS
(1)
Note:
1. Permanent device damage may occur if 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 data sheet. Exposure to absolute maximum ratlng conditions for extended periods may affect device
reliability.
2. JEDEC standard test boards with DIE attach pads soldered to PCB.
Symbol
Parameter
Value
Unit
V
CC
Power Supply Voltage
+3.15 to +3.45
V
R
EXT
(1)
Resistor to Dissipate Power
5 (Min.)
R
SET
Resistor to Set I
MOD
100 to 10,000
OPERATING CONDITIONS
Note:
1.Refer to V
OUT
specification.
4
SY88912L
Micrel, Inc.
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
Symbol
Parameter
Min.
Typ.
Max.
Unit
Condition
D
J
Jitter Generation
(2),(3)
--
--
20
ps
peak-to-peak
t
r
,
t
f
Rise/Fall Times
(2)
--
65
--
ps
(20% to 80%)
AC ELECTRICAL CHARACTERISTICS
(1)
V
CC
= 3.15 to 3.45V; GND = 0V; T
A
= 40
C to +85
C
Notes:
1. AC characteristics are guaranteed by design and characterization.
2. I
MOD
= 40mA, 25
resistors each tied from OUT and /OUT to V
CC
.
3. I
MOD
= 40mA, 2.5Gbps, 0-1 pattern, BW = 12KHz to 20MHz.
Symbol
Parameter
Min.
Typ.
(2)
Max.
Unit
Condition
I
CC
Power Supply Current
(1)
--
65
80
mA
I
MOD
= 60mA
I
MOD
Modulation Current Range
10
--
60
mA
I
MOD_OFF
Modulation Off Current
(2)
--
--
200
A
/EN = V
IHEN
V
IDDIN
Input Differential Voltage, D
IN
, /D
IN
200
--
1600
mV
PP
(3)
V
IHDIN
Input HIGH Voltage, D
IN
, /D
IN
V
CC
1.7
--
V
CC
0.1
V
V
ILDIN
Input LOW Voltage, D
IN
, /D
IN
V
CC
1.9
--
V
CC
0.3
V
V
IHEN
Input HIGH Voltage, /EN
V
CC
1165
--
V
CC
880
mV
V
ILEN
Input LOW Voltage, /EN
V
CC
1810
--
V
CC
1475
mV
V
OUT
Output Voltage, OUT, /OUT
V
CC
1.5
--
V
CC
V
(4)
V
REF
Reference Voltage1.5
1.7
1.9
V
DC ELECTRICAL CHARACTERISTICS
V
CC
= 3.15 to 3.45V; GND = 0V; T
A
= 40
C to +85
C
Notes:
1. Excluding I
MOD
. I
MOD
60mA
2. Typical values are under V
CC
= 3.3V and T
A
= 25
C.
3. V
IDDIN
is the voltage required to guarantee a stable logic level. For a logic "1", D
IN
must be V
IDDIN
above /D
IN
. For stable logic "0", D
IN
must be V
IDDIN
below /D
IN
.
4. OUT and /OUT are current outputs. This specification defines the voltage range that the user must guarantee these pins remain within proper operation.
0
10
20
30
40
50
60
70
0.1
1
10
I
MOD
(mA)
R
SET
(k
)
I
MOD
vs. R
SET
Figure 1. I
MOD
vs. R
SET
5
SY88912L
Micrel, Inc.
M9999-081005
hbwhelp@micrel.com or (408) 955-1690
16 LEAD EPAD-
Micro LEADFRAMETM (MLF-16)
Rev. 01
Package
EP- Exposed Pad
Die
CompSide Island
Heat Dissipation
Heavy Copper Plane
Heavy Copper Plane
V
EE
V
EE
Heat Dissipation
PCB Thermal Consideration for 16-Pin MLFTM Package
MICREL, INC.
2180 FORTUNE DRIVE
SAN JOSE, CA 95131
USA
TEL
+ 1 (408) 944-0800
FAX
+ 1 (408) 474-1000
WEB
http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
2005 Micrel, Incorporated.
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