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September 1998
ML6633* High Speed Fiber Optic LED Driver
GENERAL DESCRIPTION
The ML6633 is a high speed fiber optic LED driver suited for networking applications up to 200 Mbps. The part is capable of driving up to 82mA of current through a fiber optic LED from an ECL level input signal. Its efficient output stage provides a high current that can be programmed for accurate absolute output level which insures precise launch power. The LED driver's output stage provides a fast well matched rise and fall time through a unique differential output stage. The ML6633 high speed fiber optic LED driver is implemented in BiCMOS process and is available in an 8-pin SOIC package.
FEATURES
n Data rates up to 200Mbps n Current driven output for accurate launch power n Programmable output current from 20mA to 82mA n High Efficiency Output Stage n Low EMI/RFI Noise n ECL inputs n Industrial temperature version available n May be used with ML6622 quantizer
APPLICATIONS
n FDDI n Fast Ethernet, 100BASE-FX n ATM (SONET), 155Mbps n Proprietary high-speed fiber optic data links
BLOCK DIAGRAM
*Some Packages Are Obsolete
ECLP 2 ECLN 3 8 VCC + BUFFER - + DRIVER -
IOUT 7 RTSET 6
REF GND 5
1
ML6633
PIN CONNECTION
ML6633 8-Pin SOIC (S08)
NC ECLP ECLN NC 1 2 3 4 8 7 6 5 VCC IOUT RTSET GND
TOP VIEW
PIN DESCRIPTION
PIN NAME DESCRIPTION PIN NAME DESCRIPTION
1 2 3 4 5
NC ECLP ECLN NC GND
No Connect Positive ECL data input controls signal to the LED Negative ECL data input No Connect
6
RTSET
Output current programming pin. Connect a resistor of value 2/ILED from this pin to ground to set the high LED output current Fiber optic LED drive pin. Connect the LED between this pin and VCC 5V power supply
7 8
IOUT VCC
Negative power supply ground
2
ML6633
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. VCC ..................................................... GND -0.3V to 6V Input Pin Voltages .................... GND -0.3V to VCC +0.3V LED Output Current (IOUT) .................................... 82mA Peak DC Output Current (IOUT) ............................. 82mA Storage Temperature .............................. -65C to +150C Lead Temperature (Soldering 10 sec) ....................... 260C Thermal Resistance (JA) ................................... 160C/W
OPERATING CONDITIONS
Temperature Range ML6633CS .................................................... 0C to 70C ML6633IS.................................................. -40C to 85C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, VCC = 5V 5%, RTSET = 26.1 1%, TA = Operating Temperature Range, (Note 1)
SYMBOL ICC ILEDH PARAMETER Supply Current LED Current Accuracy (IOUT) High C Suffix I Suffix ILEDL tR tF tPLH tPHL tPWD IECL
Note 1:
CONDITIONS
MIN
TYP
MAX 40+IOUT
UNITS mA mA mA mA ns ns ns ns ns A
70 65
75 75
82 82 0.1 2 2
Low Rise Time (IOUT) Fall Time (IOUT) Propagation Delay (IOUT) Low to High High to Low Pulse Width Distortion (IOUT) ECL Input Current
10 10 0.5 20
Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
3
ML6633
FUNCTIONAL DESCRIPTION
The ML6633 accepts ECL input signals and generates a high speed, high accuracy output current which is independent of supply voltage variations. The output current is programmable up to 82mA. The ECL input stage is a standard NPN differential pair with a common mode range of between 1V and 4.5V with a +5V supply. With this common mode range it is possible to convert the ECL inputs into TTL. If the ECLN input is biased up to the TTL switching level, the ECLP pin can be driven by a TTL or CMOS output. Figure 1b shows a circuit implementing this technique. This circuit may degrade pulse width distortion and should be checked for acceptable performance in this configuration. Output current to the LED is set by connecting the appropriate resistance from RTSET to ground. The high level output voltage at RTSET will be 2.0V. The current in the external resistor will be equal to the current through the LED. The output current with RTSET set to 26.1Wwill be:
ILED (HIGH) = ILED (HIGH) = 2V RTSET 2V = 75mA 26.1
(1)
5V
5V
NC VIN+ VIN- NC ECLP ECLN
VCC IOUT RTSET GND
a) IOUT = 75mA
5V 5V
5V
NC TTLIN ECLP ECLN NC
VCC IOUT RTSET GND
b) ECL-to-TTL Conversion
Figure 1. Typical Applications
4
ML6633
PHYSICAL DIMENSIONS inches (millimeters)
Package: S08 8-Pin SOIC
0.189 - 0.199 (4.80 - 5.06) 8
PIN 1 ID
0.148 - 0.158 0.228 - 0.244 (3.76 - 4.01) (5.79 - 6.20)
1 0.017 - 0.027 (0.43 - 0.69) (4 PLACES) 0.050 BSC (1.27 BSC) 0.059 - 0.069 (1.49 - 1.75) 0 - 8
0.055 - 0.061 (1.40 - 1.55)
0.012 - 0.020 (0.30 - 0.51) SEATING PLANE
0.004 - 0.010 (0.10 - 0.26)
0.015 - 0.035 (0.38 - 0.89)
0.006 - 0.010 (0.15 - 0.26)
ORDERING INFORMATION
PART NUMBER ML6633CS ML6633IS TEMPERATURE RANGE 0C to 70C -40C to 85C PACKAGE 8-Pin SOIC (S08) 8-Pin SOIC (S08) (Obolsete)
(c) Micro Linear 1998.
is a registered trademark of Micro Linear Corporation. All other trademarks are the property of their respective owners.
Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470; 5,565,761; 5,592,128; 5,594,376; 5,652,479; 5,661,427; 5,663,874; 5,672,959; 5,689,167; 5,714,897; 5,717,798; 5,742,151; 5,747,977; 5,754,012; 5,757,174; 5,767,653; 5,777,514. Japan: 2,598,946; 2,619,299; 2,704,176. Other patents are pending. Micro Linear reserves the right to make changes to any product herein to improve reliability, function or design. Micro Linear does not assume any liability arising out of the application or use of any product described herein, neither does it convey any license under its patent right nor the rights of others. The circuits contained in this data sheet are offered as possible applications only. Micro Linear makes no warranties or representations as to whether the illustrated circuits infringe any intellectual property rights of others, and will accept no responsibility or liability for use of any application herein. The customer is urged to consult with appropriate legal counsel before deciding on a particular application.
2092 Concourse Drive San Jose, CA 95131 Tel: (408) 433-5200 Fax: (408) 432-0295 www.microlinear.com
DS6633-01
5

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