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SY88782L
3.3V, 1.25Gbps High Current, Low Power Laser Driver for Datacom Telecom Applications
General Description
The SY88782L is a single supply 3.3V low power consumption, small form factor, driver for telecom/datacom applications using FP/DFB lasers at data rates up to 1.25Gbps. The driver can deliver modulation current up to 90mA, and the high compliance voltage it offers makes the part suitable for high-current operation (with the laser AC- or DCcoupled to it.) This device is intended to be used with Micrel MIC3000/1 Optical Transceiver Management IC which allows for modulation and bias currents control and monitoring, automatic power Control, and temperature compensation. All support documentation can be found on Micrel's web site at: www.micrel.com.
Features
* * * * * * 2.3V minimum laser compliance voltage 44mA power supply current typical Operation up to 1.25Gbps Modulation current up to 90mA Designed for use with the MIC3000/1 Small form factor 3mm x 3mm MLFTM package
Applications
* Multi-rate LAN, MAN applications up to 1.25Gbps: Ethernet, SONET OC3/12/24 and SDH STM1/4/8 * SFF, SFP Modules
Markets
* Telecom, Datacom
________________________________________________________________ Typical Application
Laser DC-Coupled to the Driver
MicroLeadFrame is a trademark of Amkor Technology, Inc.
Laser AC-Coupled to the Driver
February 2005
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Micrel, Inc.
SY88782L
Functional Block Diagram
Ordering Information(1)
Part Number SY88782LMG SY88782LMGTR
Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = +25C, DC Electricals only. 2. Tape and Reel.
(2)
Package Type MLF-16 MLF-16
Operating Range Industrial Industrial
Package Marking 782L with Pb-Free bar-line indicator 782L with Pb-Free bar-line indicator
Lead Finish NiPdAu Pb-Free NiPdAu Pb-Free
Pin Configuration
16-Pin MLFTM (MLF-16)
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Micrel, Inc.
SY88782L
Pin Description
Pin Name 1, 4, 7, 8, 13 2 3 5, 6 9, 10 11, 12 14 15 Pin Number GND DIN+ DIN- VCC MOD- MOD+ VREF IM_SET Pin Function Ground. Ground and exposed pad must be connected to the plane of the most negative potential. Non-inverting input data. Internally terminated with 50 to a reference voltage. Inverting input data. Internally terminated with 50 to a reference voltage. Supply Voltage. Bypass with a 0.1F//0.01F low ESR capacitor as close to VCC pin as possible. Inverted modulation current output. Outputs modulation current when input data is negative. Non-inverted modulation current output. Outputs modulation current when input data is positive. Reference Voltage. Install a 0.1F capacitor between VREF and VCC. Modulation current setting and control. The voltage applied to this pin will set the modulation current. To be connected to the MIC3000/1 pin 24 (VMOD+). Input impedance 25K. A low level signal on this pin will enable the output stage of the driver. Internally pulled down with 75K.
16
/EN
Truth Table
DIN+ L H X
Notes: 1. IMOD = 0 when MOD+ = H. 2. Assuming that the laser is tied to MOD+.
DINH L X
/EN L L H
MOD+(1) H L H
MODL H L
Laser Output(2) L H L
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Micrel, Inc.
SY88782L
Absolute Maximum Ratings(1)
Supply Voltage (VIN) ...........................-0.5V to +4.0V CML Input Voltage (VIN).......... VCC-1.2V to VCC+0.5V TTL Control Input Voltage (VIN) ...................0V to VCC Lead Temperature (soldering, 20sec.) ...........+260C Storage Temperature (Ts)............... -65C to +150C
Operating Ratings(2)
Supply Voltage (VCC)...........................+3.0V to +3.6V Ambient Temperature (TA)................ -40C to +85C Package Thermal Resistance(3) MLFTM (JA) Still-air ............................................. 60C/W (JB) ......................................................... 33C/W
DC Electrical Characteristics
TA = -40C to +85C and VCC = +3.0V to +3.6V, unless otherwise noted. Typical values are VCC = +3.3V, TA = 25C, IMOD = 60mA.
Symbol ICC VMOD_MIN Parameter Power Supply Current Minimum Voltage Required at the Driver Output (headroom) for Proper Operation Input Resistance (DIN+, DIN-) Differential Input Voltage Swing Condition Modulation currents excluded 0.7 Min Typ 44 Max 60
(4)
Units mA V
RIN(DATA) VID /EN Low /EN High RIN (IMOD_SET) VIM_SET
45 200 2
50
55 2400 0.8
mVpp V V k
IM_SET Input Resistance Voltage Range on IM_SET Pin IMOD range 10mA to 90mA
25 1.2
V
AC Electrical Characteristics
TA = -40C to +85C and VCC = +3.0V to +3.6V, unless otherwise noted. Typical values are VCC = +3.3V, TA = 25C, IMOD = 60mA.
Symbol IMOD Parameter Data Rate Modulation Current(5) Condition NRZ AC-coupled DC-coupled IMOD_OFF tr tf Modulation OFF Current Output Current Rise Time Output Current Fall Time Total Jitter Pulse-Width Distortion
Notes: 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 ratings conditions for extended periods may affect device reliability. 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. Package Thermal Resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB. JB uses a 4-layer and JA in still air unless otherwise stated. 4. ICC = 60mA for worst-case conditions with IMOD = 90mA, TA = +85C, VCC = 3.6V. 5. Load = 15. 6. Assuming VCC = 3.0V, Laser bandgap voltage = 1V, laser package inductance = 1nH, laser equivalent series resistor = 5, and damping resistor = 10.
Min 0.05 10 10
Typ
Max 1.25 90 70
(6)
Units Gbps mA mA A ps ps
Current at MOD+ when the device is disabled 20% to 80%, IMOD = 60mA 20% to 80%, IMOD = 60mA @1.25Gbps data rate 80 80
750
20 20
psPP ps
February 2005
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M9999-021005 hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SY88782L
Typical Operating Characteristics
February 2005
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M9999-021005 hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SY88782L
Functional Characteristics
February 2005
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Micrel, Inc.
SY88782L
Input and Output Stages
Figure 1a. Simplified Input Stage
Figure 1b. Simplified Output Stage
Interface the Input to Different Logic Drivers
Figure 2a. DC-Coupling to LVPECL Driver
Figure 2b. AC-Coupling to LVPECL Driver
Figure 2c. AC-Coupling to CML Driver
Figure 2d. AC-Coupling to LVDS Driver
February 2005
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M9999-021005 hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SY88782L
16 LEAD (3mmx3mm) MicroLEADFRAMETM (MLF-16)
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 a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Incorporated.
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