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Linear Technology Electronic Components Datasheet

LTC5100 Datasheet

3.2Gbps VCSEL Driver

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LTC5100
3.3V, 3.2Gbps VCSEL Driver
FEATURES
DESCRIPTIO
s 155Mbps to 3.2Gbps Laser Diode Driver for VCSELs*
s 60ps Rise and Fall Times, 10ps Deterministic Jitter
s Eye Diagram is Stable and Consistent Across
Modulation Range and Temperature
s 1mA to 12mA Modulation Current
s Easy Board Layout, Laser can be Remotely Located
if Desired
s No Input Matching or AC Coupling Components
Needed
s On-Chip ADC for Monitoring Critical Parameters
s Digital Setup and Control with I2CTM Serial Interface
s Emulation and Set-Up Software Available**
s Operates Standalone or with a Microprocessor
s On-Chip DACs Eliminate External Potentiometers
s Constant Current or Automatic Power Control
s First and Second Order Temperature Compensation
s On-Chip Temperature Sensor
s Extensive Eye Safety Features
s Single 3.3V Supply
s 4mm × 4mm QFNUPackage
APPLICATIO S
s Gigabit Ethernet and Fibre Channel Transceivers
s SFF and SFP Transceiver Modules
s Proprietary Fiber Optic Links
The LTC®5100 is a 3.2Gbps VCSEL driver offering an
unprecedented level of integration and high speed perfor-
mance. The part incorporates a full range of features to
ensure consistently outstanding eye diagrams. The data
inputs are AC coupled, eliminating the need for external
capacitors. The LTC5100 has a precisely controlled 50
output that is DC coupled to the laser, allowing arbitrary
placement of the IC. No coupling capacitors, ferrite beads
or external transistors are needed, simplifying layout,
reducing board area and the risk of signal corruption. The
unique output stage of the LTC5100 confines the modula-
tion current to the ground system, isolating the high speed
signal from the power supply to minimize RFI.
The LTC5100 supports fully automated production with its
extensive monitoring and control features. Integrated 10-bit
DACs eliminate the need for external potentiometers. An on-
board 10-bit ADC provides the laser current and voltage,
as well as monitor diode current and temperature. Status
informationisavailablefrom theI2Cserialinterfaceforfeed-
back and statistical process control.
An internal digital controller compensates laser tempera-
ture drift and provides extensive laser safety features.
, LTC and LT are registered trademarks of Linear Technology Corporation.
I2C is a trademark of Philips Electronics N.V.
*Vertical Cavity Surface Emitting Laser
**Downloadable from www.linear.com
TYPICAL APPLICATIO
24LC00 EEPROM
IN SOT-23 PACKAGE
3.3V
VDD
SDA
SCL
MD
ADC
DIGITAL
CONTROLLER
EN
FAULT
DAC
DAC
10nF
SRC
50
SERIALIZER
IN+
IN
VSS
100
MODA
+
MODB
3.2Gbps
MODULATOR
5100 F01
WARNING: POTENTIAL EYE HAZARD.
SEE “EYE SAFETY INFORMATION”
ARBITRARY
DISTANCE
Figure 1. VCSEL Transmitter with Automatic Power Control
3.2Gbps Electrical Eye Diagram
1mA/DIV
50ps/DIV
5100 TA01
sn5100 5100fs
1


Linear Technology Electronic Components Datasheet

LTC5100 Datasheet

3.2Gbps VCSEL Driver

No Preview Available !

LTC5100
ABSOLUTE AXI U RATI GS
(Note 1)
VDD, VDD(HS) ............................................................. 4V
IN+, IN(Cml_en = 1) (Note 6)
Peak Voltage ........... VDD(HS) – 1.2V to VDD(HS) + 0.3V
Average Voltage...... VDD(HS) – 0.6V to VDD(HS) + 0.3V
IN+, IN(Cml_en = 0) (Note 4) .. –0.3V to VDD(HS) + 0.3V
Cml_en = 0 (Note 4)
Peak Difference Between IN+ and IN.............. ±2.5V
Average Difference Between IN+ and IN....... ±1.25V
MODA, MODB (Transmitter Disabled) .... –0.3V to 2.75V
MODA, MODB
(Transmitter Enabled) ............ VDD(HS) – 2.75V to 2.75V
EN, SDA, SCL, FAULT ..................... –0.3V to VDD + 0.3V
MD, SRC ................................................... –0.3V to VDD
Ambient Operating Temperature Range .. – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
16 15 14 13
VSS 1
12 VSS
IN+ 2
11 MODA
IN 3 17 10 MODB
VSS 4
9 VSS
5678
ORDER PART
NUMBER
LTC5100EUF
UF PART MARKING
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD IS VSS (PIN 17)
MUST BE SOLDERED TO PCB GROUND PLANE
5100
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C; VDD = VDD(HS) = 3.3V, IS = 24mA; IM = 12mA (IMPP = 24mA); 49.9, 1%
resistor from SRC (Pin 14) to MODA (Pin 11); 50, 1% load AC coupled to MODB (Pin 10); 10nF, 10% capacitor from SRC (Pin 14) to
VSS; Cml_en = 0, Lpc_en = 1, transmitter enabled, unless otherwise noted. Test circuit in Figure 5.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Power Supply
VDD, VDD(HS) Operating Voltage
VDD + VDD(HS) Quiescent Current,
Excluding the SRC Pin Current (Note 2)
VDD = 3.465V
q 3.135 3.3 3.465
V
Transmitter Disabled, Power_down_en = 1
4.5 mA
Transmitter Enabled, Is_rng = Im_rng = 3
Impp = 24mA
High Speed Data Inputs (IN+ and INPins) (Test Circuit, Figure 5)
54 mA
Input Signal Amplitude
Peak-to-Peak Differential Voltage (The Single-
Ended Peak-to-Peak Voltage is One Half the
Differential Voltage)
500 to 2400
mVP-P
Common Mode Input Signal Range (Note 3)
Differential Input Resistance
Cml_en = 0 (Note 4)
0 VDD(HS)
80 to 120
V
Common Mode Input Resistance
Cml_en = 0 (Note 5)
50 k
Open-Circuit Voltage
Cml_en = 0 (Note 5)
1.65 V
SRC Pin Current, IS
Full-Scale IS Current
Is_rng = 0
Is_rng = 1
Is_rng = 2
Is_rng = 3
69
12 18
18 27
24 36
mA
mA
mA
mA
Minimum Operating Current (Note 7)
Resolution
1/16 of Full-Scale IS Current
10
Bits
SRC Pin Voltage Range
1.2
VDD
V
200mV
sn5100 5100fs
2


Part Number LTC5100
Description 3.2Gbps VCSEL Driver
Maker Linear Technology
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