SY88702.pdf 데이터시트 (총 5 페이지) - 파일 다운로드 SY88702 데이타시트 다운로드

No Preview Available !

Micrel
5V 622Mbps LASER DIODE
DRIVER WITH OUTPUT ENABLE
SY88702
SY88702
FEATURES
s Up to 622Mbps operation
s Modulation current to 25mA
s PECL output enable
s Differential PECL inputs
s Single 5V power supply
s Available in a tiny 10-pin (3mm) MSOP
APPLICATIONS
s 622Mbps SONET
DESCRIPTION
The SY88702 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 flows through
OUT when output enable is HIGH.
The device incorporates complementary open collector
outputs with 25mA 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.
The SY88702 utilizes the high performance bipolar
ASSET™ technology.
FUNCTIONAL BLOCK DIAGRAM
www.DataSheet4U.com
DIN
/DIN
/EN
VCC
REXT
/OUT
Internal
Logic
IMOD
40X
VREF
RSET
VEE
RSET
OUT
RSER
to Laser Diode
VCC
GND
ASSET is a trademark of Micrel, Inc.
1
Rev.: B Amendment: /0
Issue Date: August 2003

No Preview Available !

Micrel
PACKAGE/ORDERING INFORMATION
/EN 1
DIN 2
/DIN 3
VREF 4
RSET 5
10 VCC
9 OUT
8 /OUT
7 GND
6 GND
10-Pin MSOP
(K10-1)
SY88702
Ordering Information
Part Number
SY88702KC
SY88702KCTR*
SY88702KI
SY88702KITR*
*Tape and Reel
Package
Type
K10-1
K10-1
K10-1
K10-1
Operating
Range
Commercial
Commercial
Industrial
Industrial
Package
Marking
702
702
702
702
PIN DESCRIPTION
Pin Number
1
2, 3
4
5
6, 7
9, 8
10
Pin Name
/EN
DIN, /DIN
VREF
RSET
GND
OUT, /OUT
VCC
Pin Function
100k PECL compatible input with 75kpull-down resistor. Modulation current goes to zero
when deasserted high.
Differential 100k PECL compatible input with 75kpull-down resistors.
Voltage reference for use with RSET.
An external resistor connected from here to VREF sets the reference current for IOUT.
Device ground.
Differential open collector current outputs.
Positive power supply.
TRUTH TABLE(1)
D /D /EN
LHL
HL L
XXH
Note 1. L = LOW, H = HIGH, X = don't care.
Note 2. H = IOUT = 0mA.
OUT (2)
H
L
H
/OUT
L
H
L
2

No Preview Available !

Micrel
SY88702
Absolute Maximum Ratings(Note 1)
Power Supply Voltage (VCC) ............................ 0V to +7.0V
Input Voltage (VIN) .............................................. 0V to VCC
Output Current (IOUT) ................................................. 25mA
Power Dissipation (PD) ........................................... 250mW
Storage Temperature Range (TS) ............ 55°C to +125°C
Operating Ratings(Notes 2,3,4)
Supply Voltage (VCC) .................................. +4.5V to +5.5V
Ambient Temperature (TA), Note 5 ............ 40°C to +85°C
Junction Temperature (TJ), Note 5 ............ 40°C to 100°C
Resistor to Dissipate Power (REXT) .................. 10to 50
Laser Diode Serial Resistor (RSER) .................... 0to 50
Resistor to Adjust Current (RSET) .......... 1500to 50,000
Package Thermal Resistance
MSOP
JA) Still-Air ...................................................... 113°C/W
JB) Still-Air ........................................................ 74°C/W
DC ELECTRICAL CHARACTERISTICS
GND = 0V; VCC = 5V ±10%; TA = 40°C to +85°C
Symbol
Parameter
Condition
Min Typ Max Units
VIH
VIL
VREF
IIL
IIH
ICC
IOUT_OFF
Input HIGH Voltage
(DIN, /DIN, /EN)
Input LOW Voltage
(DIN, /DIN, /EN)
Reference Voltage
Input LOW Current
(DIN, /DIN, /EN)
Input HIGH Current
(DIN, /DIN, /EN)
Supply Current
Output LOW Current
(/EN = HIGH)
VIN = VIL(min)
IMOD = 25mA
VCC1.165
VCC0.880 V
VCC1.810
VCC1.475 V
3.00
0.5
V
µA
100 µA
16 25 mA
500 µA
IOUT
ARSET
VOUT
COUT
Modulation Current
IOUT/IRSET
Voltage at OUT, /OUT
Capacitance on OUT, /OUT
5 15 25 mA
30 38 44
VCC2.3
VCC V
2.5 pF
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
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.
The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
The device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device
is tested in a socket such that transverse airflow of 500lfpm is maintained.
The voltage drop across REXT and RSER plus Laser Diode must not be greater than 2.3V.
Commercial devices are guaranteed from 0°C to +85°C ambient temperature.
3

No Preview Available !

Micrel
AC ELECTRICAL CHARACTERISTICS(Note 1)
GND = 0V; VCC = 5V ±10%; TA = 40°C to +85°C
Symbol
Parameter
Condition
tPHL, tPLH D
tPHL, tPLH EN
Propagation Delay
DIN OUT
Propagation Delay
/EN OUT
IOUT = 10mA
IOUT = 10mA
tr Rise/Fall Time
tf (20% to 80%)
IOR Output Current Ringing
IOUT = 5 to 25mA
Note 1. REXT = RSER = 50Ω ±1%; RSER connected directly to VCC.
SY88702
Min Typ Max Units
1000 ps
1000 ps
400 ps
10 %
TYPICAL OPERATING CHARACTERISTICS
IMOD vs. RSET
30
25
20
15
10
5
0.0
0.0
2.0K
4.0K
6.0K
9RSET ( )
8.0K
10K
12K
4

No Preview Available !

Micrel
10 LEAD MSOP (K10-1)
SY88702
Rev. 00
MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com
The information furnished by Micrel in this datasheet 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 Purchasers
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchasers own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2003 Micrel, Incorporated.
5