Linear Technology LTC5100 User manual

LTC5100

sn5100 5100fs

FEATURES

APPLICATIO S

DESCRIPTIO

TYPICAL APPLICATIO

■

Gigabit Ethernet and Fibre Channel Transceivers

■

SFF and SFP Transceiver Modules

■

Proprietary Fiber Optic Links

, LTC and LT are registered trademarks of Linear Technology Corporation.

■

155Mbps to 3.2Gbps Laser Diode Driver for VCSELs*

■

60ps Rise and Fall Times, 10ps Deterministic Jitter

■

Eye Diagram is Stable and Consistent Across

Modulation Range and Temperature

■

1mA to 12mA Modulation Current

■

Easy Board Layout, Laser can be Remotely Located

if Desired

■

No Input Matching or AC Coupling Components

Needed

■

On-Chip ADC for Monitoring Critical Parameters

■

Digital Setup and Control with I

Serial Interface

■

Emulation and Set-Up Software Available**

■

Operates Standalone or with a Microprocessor

■

On-Chip DACs Eliminate External Potentiometers

■

Constant Current or Automatic Power Control

■

First and Second Order Temperature Compensation

■

On-Chip Temperature Sensor

■

Extensive Eye Safety Features

■

Single 3.3V Supply

■

4mm ×4mm QFN Package

3.3V, 3.2Gbps VCSEL Driver

C is a trademark of Philips Electronics N.V.

*Vertical Cavity Surface Emitting Laser

**Downloadable from www.linear.com

Figure 1. VCSEL Transmitter with Automatic Power Control

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 50Ω

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-

tioncurrenttothegroundsystem,isolatingthehighspeed

signal from the power supply to minimize RFI.

TheLTC5100supportsfullyautomatedproductionwithits

extensivemonitoringandcontrolfeatures.Integrated10-bit

DACseliminatetheneedforexternalpotentiometers.Anon-

board 10-bit ADC provides the laser current and voltage,

as well as monitor diode current and temperature. Status

informationisavailablefrom theI

Cserialinterfaceforfeed-

back and statistical process control.

An internal digital controller compensates laser tempera-

ture drift and provides extensive laser safety features.

3.2Gbps Electrical Eye Diagram

1mA/DIV

50ps/DIV

5100 TA01

–

ADC

3.3V

SCL

SDA

24LC00 EEPROM

IN SOT-23 PACKAGE

MODA

SRC

MODB

DAC

10nF

3.2Gbps

MODULATOR

FAULT

WARNING: POTENTIAL EYE HAZARD.

SEE “EYE SAFETY INFORMATION”

100Ω

–

50Ω

5100 F01

DIGITAL

CONTROLLER

ARBITRARY

DISTANCE

SERIALIZER

LTC5100

sn5100 5100fs

, V

DD(HS)

............................................................. 4V

, IN

–

(Cml_en = 1) (Note 6)

Peak Voltage........... V

DD(HS)

– 1.2V to V

DD(HS)

+ 0.3V

Average Voltage...... V

DD(HS)

– 0.6V to V

DD(HS)

+ 0.3V

, IN

–

(Cml_en = 0) (Note 4).. –0.3V to V

DD(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) ............ V

DD(HS)

– 2.75V to 2.75V

EN, SDA, SCL, FAULT .....................–0.3V to V

+ 0.3V

MD, SRC................................................... –0.3V to V

Ambient Operating Temperature Range.. –40°C to 85°C

Storage Temperature Range ................ –65°C to 125°CConsult LTC Marketing for parts specified with wider operating temperature ranges.

ABSOLUTE AXI U RATI GS

PACKAGE/ORDER I FOR ATIO

UUW

(Note 1)

ELECTRICAL CHARACTERISTICS

The ●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); 49.9Ω, 1%

resistor from SRC (Pin 14) to MODA (Pin 11); 50Ω, 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.

ORDER PART

NUMBER

UF PART MARKING

5100

LTC5100EUF

JMAX

= 125°C, θ

= 37°C/W

EXPOSED PAD IS V

(PIN 17)

MUST BE SOLDERED TO PCB GROUND PLANE

16 15 14 13

5 6 7 8

TOP VIEW

UF PACKAGE

16-LEAD (4mm ×4mm) PLASTIC QFN

1VSS

IN+

IN–

VSS

MODA

MODB

VSS

VDD

SRC

FAULT

SDA

SCL

VDD(HS)

1/16 of Full-Scale I

Current

PARAMETER CONDITIONS MIN TYP MAX UNITS

Power Supply

, V

DD(HS)

Operating Voltage ●3.135 3.3 3.465 V

+ V

DD(HS)

Quiescent Current, V

= 3.465V

Excluding the SRC Pin Current (Note 2)

Transmitter Disabled, Power_down_en = 1 4.5 mA

Transmitter Enabled, Is_rng = Im_rng = 3 54 mA

Impp = 24mA

High Speed Data Inputs (IN

and IN

–

Pins) (Test Circuit, Figure 5)

Input Signal Amplitude Peak-to-Peak Differential Voltage (The Single- 500 to 2400 mV

P-P

Ended Peak-to-Peak Voltage is One Half the

Differential Voltage)

Common Mode Input Signal Range (Note 3) Cml_en = 0 (Note 4) 0 V

DD(HS)

Differential Input Resistance 80 to 120 Ω

Common Mode Input Resistance Cml_en = 0 (Note 5) 50 kΩ

Open-Circuit Voltage Cml_en = 0 (Note 5) 1.65 V

SRC Pin Current, I

Full-Scale I

Current Is_rng = 0 6 9 mA

Is_rng = 1 12 18 mA

Is_rng = 2 18 27 mA

Is_rng = 3 24 36 mA

Minimum Operating Current (Note 7)

Resolution 10 Bits

SRC Pin Voltage Range 1.2 V

–V

200mV

LTC5100

sn5100 5100fs

ELECTRICAL CHARACTERISTICS

The ●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); 49.9Ω, 1%

resistor from SRC (Pin 14) to MODA (Pin 11); 50Ω, 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.

1/8 of Full-Scale Peak-to-Peak

Modulation Current

PARAMETER CONDITIONS MIN TYP MAX UNITS

Laser Bias Current, I

Full-Scale Current (Note 8) Is_rng = 0 6 – I

9 – I

Is_rng = 1 12 – I

18 – I

Is_rng = 2 18 – I

27 – I

Is_rng = 3 24 – I

36 – I

Absolute Accuracy SRC Pin and MODA, MODB Pin Currents Within ±25 %

Specified Voltage Ranges

Resolution 10 Bits

Linear Tempco Resolution 122 ppm/°C

Linear Tempco Range ±15625 ppm/°C

Second Order Tempco Resolution 3.81 ppm/°C

Second Order Tempco Range ±488 ppm/°C

Temperature Stability Ib_tc1 = 0, Ib_tc2 = 0 ±500 ppm/°C

Off-State Leakage Transmitter Disabled, V

SRC

= 1.2V 50 µA

MODA, MODB Pin Current, I

Full Scale, Peak-to-Peak Modulation Current (Note 9) Im_rng = 0 6 9 mA

Im_rng = 1 12 18 mA

Im_rng = 2 18 27 mA

Im_rng = 3 24 36 mA

Minimum Operating Current (Note 10)

Resolution (Note 11) 9 Bits

Current Stability Im_tc1 = 0, Im_tc2 = 0 ±500 ppm/°C

Voltage Range Peak Transient Voltage on MODA and MODB 1.2 2.7 V

Absolute Accuracy of the Modulation Current ±25 %

Linear Tempco Resolution 122 ppm/°C

Linear Tempco Range ±15625 ppm/°C

Second Order Tempco Resolution 3.81 ppm/°C

Second Order Tempco Range ±484 ppm/°C

Maximum Bit Rate 3.2 Gbps

Modulation Current Rise and Fall Times 20% to 80% Measured with K28.5 Pattern at 60 ps

2.5Gbps

Deterministic Jitter, Peak-to-Peak (Note 12) Measured with K28.5 Pattern at 3.2Gbps 10 ps

Random Jitter, RMS (Note 13) 1ps

RMS

Pulse Width Distortion 10 ps

Automatic Power Control (Note 14)

Minimum Operating Current for the Monitor Diode 20% of Full Scale

(Note 15) Monitor Diode Current

Temperature Stability Imd_tc1 = 0, Imd_tc2 = 0 ±500 ppm/°C

Monitor Diode Bias Voltage (Note 16) I

≤1600µA 1.45 V

LTC5100

sn5100 5100fs

ELECTRICAL CHARACTERISTICS

The ●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); 49.9Ω, 1%

resistor from SRC (Pin 14) to MODA (Pin 11); 50Ω, 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

Automatic Power Control (Note 14)

Temperature Compensation (Note 17)

Linear Tempco Resolution 254 • Imd_nom/1024 ppm/°C

Linear Tempco Range ±32300 • Imd_nom/1024 ppm/°C

ADC

Resolution 10 Bits

Source Current Measurement, I

(SRC Pin Current)

Full Scale Is_rng = 0 9 mA

Is_rng = 1 18 mA

Is_rng = 2 27 mA

Is_rng = 3 36 mA

Accuracy ±3% of Full Scale

±25% of Reading

Average Modulation Current Measurement, I

(Note 18)

Full Scale Im_rng = 0 9 mA

Im_rng = 1 18 mA

Im_rng = 2 27 mA

Im_rng = 3 36 mA

Accuracy ±3% of Full Scale

±25% of Reading

Laser Diode Voltage Measurement

Full Scale 3.5 V

Accuracy ±150mV ±10% of Reading

Monitor Diode Current Measurement (Note 19)

Full Scale Imd_rng = 0 34 µA

Imd_rng = 1 136 µA

Imd_rng = 2 544 µA

Imd_rng = 3 2176 µA

Zero Scale ADC Code = 0 1/8 of Full Scale

Resolution Relative to Reading 0.2 %

Accuracy ±25% of Reading

Temperature Measurement

Full Scale Celsius 239 °C

Sensitivity 0.500 °C/LSB

Termination Resistor Voltage Measurement

Full Scale Is_rng = 0 400 mV

Is_rng = 1 800 mV

Is_rng = 2 1200 mV

Is_rng = 3 1600 mV

Accuracy ±30mV ±10% of Reading

Safety Shutdown, Undervoltage Lockout (UVLO)

Undervoltage Detection V

Decreasing 2.8 V

Undervoltage Detection Hysteresis 150 mV

LTC5100

sn5100 5100fs

ELECTRICAL CHARACTERISTICS

The ●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); 49.9Ω, 1%

resistor from SRC (Pin 14) to MODA (Pin 11); 50Ω, 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

Bias Current Limit, I

B(LIMIT)

Set Point Resolution 7 Bits

Set Point Range Is_rng = 0 9 mA

Is_rng = 1 18 mA

Is_rng = 2 27 mA

Is_rng = 3 36 mA

Optical Power Limit Automatic Power Control Mode Only, Apc_en = 1

Overpower Limit Expressed in % Over the Imd Set Point 50 %

Underpower Limit Expressed in % Under the Imd Set Point –50 %

Safety Shutdown Response Time Time from the Fault Occurance to Reduction of 100 µs

the Laser Bias Current to 10% of Nominal

FAULT Output, Open-Drain Mode, Flt_drv_mode = 0

Output Low Voltage I

= 3.3mA 0.4 V

Output High Leakage Current V

FAULT

= 2.4V 10 µA

FAULT Output, Open-Drain Mode with 330µA Internal Pull Up, Flt_drv_mode = 1

Output Low Voltage I

= 3.3mA 0.4 V

Output High Current V

FAULT

= 2.4V –280 µA

FAULT Output, Open-Drain Mode with 500µA Internal Pull Up, Flt_drv_mode = 2

Output Low Voltage I

= 3.3mA 0.4 V

Output High Current V

FAULT

= 2.4V –425 µA

FAULT Output, Complementary Drive Mode, Flt_drv_mode = 3

Output High Voltage I

= –3.3mA 2.4 V

Output Low Voltage I

= 3.3mA 0.4 V

EN Input, Ib_gain or (Apc_gain in APC Mode) = 16, Im_gain = 4, Is_rng = 0, Im_rng = 0

Input Low Voltage 0.8 V

Input High Voltage 2V

Input Low Current En_polarity = 0 (EN Active Low), V

= 0V –10 µA

Input High Current En_polarity = 0 (EN Active Low), V

= V

–10 to 10 µA

Input Low Current En_polarity = 1 (EN Active High), V

= 0V –10 to 10 µA

Input High Current En_polarity = 1 (EN Active High), V

= V

10 µA

Transmit Enable Time Time from Active Transition on EN to 95% of 100 ms

Nominal Laser Power and 95% of Full Modulation.

First Time Transmission is Enabled After Power

On or with Rapid_restart_en = 0

Transmit Re-Enable Time Time from Active Transition on EN to 95% of 1 ms

Nominal Laser Power and 95% of Full Modulation.

When Transmission is Re-Enabled After the First

Time and with Rapid_restart_en = 1

Transmit Disable Time Time from Inactive Transition on EN to 5% of 10 µs

Nominal Laser Power

Minimum Pulse Width Required to Clear 10 µs

a Latched Fault

LTC5100

sn5100 5100fs

ELECTRICAL CHARACTERISTICS

The ●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); 49.9Ω, 1%

resistor from SRC (Pin 14) to MODA (Pin 11); 50Ω, 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.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: The quiescent V

and V

DD(HS)

currents refer to the current with

zero SRC pin current (i.e., the laser is operating with zero bias current and

zero modulation current). The total power supply current is the quiescent

current plus the SRC pin current, I

, plus any current sinked from IN

and

–

Note 3: The peak transient voltage at the IN

and IN

–

pins must not

exceed the range of –300mV to V

DD(HS)

+ 300mV.

Note 4: When Cml_en = 0 (not in CML mode), the termination is 100Ω

differential with 50k common mode to V

DD(HS)

/2.

Note 5: The common mode input resistance is measured relative to

DD(HS)

/2 with the inputs tied together.

Note 6: When Cml_en = 1 (CML mode), the termination is nominally 50Ω

to V

DD(HS)

on each of the IN

and IN

–

pins.

Note 7: The SRC pin current can be programmed to near zero in each

range, but the recommended minimum operating level is 1/16 of full scale.

Note 8: The laser bias current is the average current delivered to the laser.

It is equal to the SRC pin current minus the average modulation current at

the MODA and MODB pins, or I

= I

– I

. Full scale for the bias current

therefore depends on Is_rng and the actual modulation current.

Note 9: The MODA and MODB pins are connected on-chip. The modulation

current refers to the sum of the currents on these pins. I

refers to the

total average current at the MODA and MODB pins. I

MPP

refers to the total

peak-to-peak modulation current at the MODA and MODB pins. I

MPP

differs

from the laser modulation current, I

MOD

. I

MPP

splits between the laser and

the termination resistor according to I

MOD

= I

MPP

• R

/(R

+ R

), where

is the value of the termination resistor and R

is the dynamic

resistance of the laser diode.

PARAMETER CONDITIONS MIN TYP MAX UNITS

SCL, SDA

SCL, SDA Input Low Voltage, V

–0.5 0.3 • V

SCL, SDA Input High Voltage, V

0.7 • V

0.5

SCL, SDA Input Low Current (Note 21) V

SDA

, V

SCL

= 0.1 • V

–100 µA

SCL, SDA Input High Current (Note 21) V

SDA

, V

SCL

= 0.9 • V

–100 µA

SCL, SDA Output Low Voltage I

= 3mA 0 0.4 V

Hysteresis 280 mV

Serial Interface Timing (Note 20)

SCL Clock Frequency 100 kHz

Hold Time (Repeated) START Condition. After This 4 µs

Period the First Clock Pulse is Generated

Low Period of the SCL Clock 4.7 µs

High Period of the SCL Clock 4µs

Set-Up Time for a Repeated START Condition 4.7 µs

Data Hold Time 0 3.45 µs

Data Set-Up Time 250 ns

Input Rise Time of Both SDA and SCL Signals 1000 ns

Output Fall Time of SCL and SDA from V

IH(MIN)

to 300 ns

IL(MAX)

with a Bus Capacitance from 10pF to 400pF

Set-Up Time for STOP Condition 4µs

Bus Free Time Between a STOP and START Condition 4.7 µs

Capacitive Load for Each Bus Line 400 pF

Noise Margin at the LOW Level for Each Connected 0.1 • V

Device (Including Hysteresis) V

Noise Margin at the HIGH Level for Each Connected 0.2 • V

Device (Including Hysteresis) V

LTC5100

sn5100 5100fs

ELECTRICAL CHARACTERISTICS

Note 10: The modulation current can be programmed to near zero in each

range, but the high speed performance is not guaranteed for currents less

than the specified minimum.

Note 11: The effective resolution of the modulation current is 9 bits

because the modulation servo system uses only one-half of the 10-bit

ADC range.

Note 12: As defined in ANSI x3.230, Annex A, deterministic jitter is the

peak-to-peak deviation of the 50% crossings of the modulation signal

when compared to the ideal time crossings. The specification for the

LTC5100 pertains to the electrical modulation signal. The K28.5 pattern is

the repeating sequence 00111110101100000101.

Note 13: Random jitter is the standard deviation of the 50% crossings of

the electrical modulation signal as measured by an oscilloscope. It is

measured with a 1GHz square wave after quadrature subtraction of the

random jitter of the pulse generator and oscilloscope. Peak-to-peak

random jitter is defined as 14 times the RMS random jitter.

Note 14: The LTC5100 digitizes and servo controls the logarithm of the

monitor diode current. Many of the characteristics of the APC system,

such as range and resolution, are determined by the ADC.

Note 15: The minimum practical operating current for the monitor diode is

determined by servo settling time considerations.

Note 16: I

must be less than 25µA, 100µA, 400µA and 1600µA

corresponding to Imd_rng = 0, 1, 2, 3.

Note 17: The temperature coefficients of the monitor diode current depend

on the I

setting because of the logarithmic relationship between the set

point and the monitor diode current. Imd_nom is the digital code setting

for the nominal monitor diode current. Imd_nom lies between 0 and 1023.

Note 18: The ADC digitizes the average modulation current, which is 50%

of the peak-to-peak current for a 50% duty cycle signal.

Note 19: The LTC5100 ADC digitizes the logarithm of the monitor diode

current. This implies that the ADC resolution is a constant percentage of

reading and that the monitor diode current is non-zero when the ADC

reads zero. See the Design Notes for further information.

Note 20: Serial interface timing is guaranteed by design from

–40°C to 85°C.

Note 21: The LTC5100 has 100µA nominal pull-up current sources on the

SCL and SDA pins to eliminate the need for external pull-up resistors when

connected to a single EEPROM device. The LTC5100 meets the maximum

rise time specification of 1000ns with external I

C bus capacitances up to

25pF. Example: 10pF EEPROM + 150mm trace ~ 25pF.

Note 22: V

and V

DD(HS)

must be tied together on the PC board.

LTC5100

sn5100 5100fs

TYPICAL PERFOR A CE CHARACTERISTICS

VDD = VDD(HS) = 3.3V, TA= 25°C, Cml_en = 0, Lpc_en = 1, transmitter enabled, unless otherwise noted. Test circuit shown in Figure 5.

Optical Eye Diagram at 3.2Gbps

with 850nm VCSEL

100µW/DIV

50ps/DIV 5100 G01

EMCORE MODE LC-TOSA VCSEL

PRBS, 7dB EXTINCTION RATIO, 300µW AVG

PWR, 2.4GHz 4TH ORDER BESSEL-THOMPSON

LOWPASS FILTER

Optical Eye Diagram at 2.5Gbps

with 850nm VCSEL

125µW/DIV

60ps/DIV 5100 G02

EMCORE MODE LC-TOSA VCSEL

PRBS, 10dB EXTINCTION RATIO, 300µW AVG

PWR, 1.87GHz 4TH ORDER BESSEL-THOMPSON

LOWPASS FILTER

Effect of Peaking Control on the

Electrical Eye Diagram

3mA/DIV

50ps/DIV 5100 G03

3.2Gbps, 2

PRBS, Im_rng = 2, I

MPP

= 12mA,

PEAKING = 4, 8, 16, 30

Electrical Eye Diagram at 25°C

3.2Gbps, 223 PRBS, IMPP = 3mA

0.5mA/DIV

49ps RISING 50ps/DIV 5100 G04

54ps FALLING

Im_rng = 0

PEAKING = 16

Electrical Eye Diagram at 25°C

3.2Gbps, 223 PRBS, IMPP = 12mA

2mA/DIV

51ps RISING 50ps/DIV 5100 G05

59ps FALLING

Im_rng = 2

PEAKING = 16

Electrical Eye Diagram at 25°C

3.2Gbps, 223 PRBS, IMPP = 24mA

4mA/DIV

50ps RISING 50ps/DIV 5100 G06

62ps FALLING

Im_rng = 3

PEAKING = 16

Electrical Eye Diagram at –40°C,

3.2Gbps, 223 PRBS, IMPP = 12mA

2mA/DIV

47ps RISING 50ps/DIV 5100 G07

56ps FALLING

Im_rng = 2

PEAKING = 16

Electrical Eye Diagram at 85°C,

3.2Gbps, 223 PRBS, IMPP = 12mA

2mA/DIV

57ps RISING 50ps/DIV 5100 G09

67ps FALLING

Im_rng = 2

PEAKING = 16

2mA/DIV

LTC5100

sn5100 5100fs

TYPICAL PERFOR A CE CHARACTERISTICS

VDD = VDD(HS) = 3.3V, TA= 25°C, Cml_en = 0, Lpc_en = 1, transmitter enabled, unless otherwise noted. Test circuit shown in Figure 5.

Supply Current vs Modulation

Level (Excluding Laser Current) Supply Current vs Temperature Modulator Output Resistance

vs Modulation Level

Impp (mA)

IDD + IDD(HS) (mA)

40 Im_rng

481216

5100 G16

20 24

50 Im_rng

Im_rng

2Im_rng

TRANSMIT DISABLED

AND Power_down_en = 0

TRANSMIT DISABLED

AND Power_down_en = 1

TRANSMIT

ENABLED

TEMPERATURE (°C)

–40

48.1

48.0

47.9

47.8

47.7

47.6

47.5

47.4 20 60

5100 G17

–20 0 40 80

+ I

DD(HS)

(mA)

Im_rng = 3

Impp = 12mA

Ib = 0.0mA

(INCLUDES SRC PIN

CURRENT REQUIRED

TO SUPPLY THE AVERAGE

MODULATION CURRENT

Impp (mA)

100

OUTPUT RESISTANCE (Ω)

1000

10000

10 100

5100 G18

Laser Bias Current

vs Temperature in CCC Mode Monitor Diode Current

vs Temperature in APC Mode

TEMPERATURE (°C)

–40

0.97

(NORMALIZED)

0.98

0.99

1.00

1.01

–20 0 20 40

5100 G20

60 80

NORMALIZED TO UNITY AT 25°C

Ib_tc1 = Ib_tc2 = 0

TEMPERATURE (°C)

–40

0.97

IMD (NORMALIZED)

0.98

0.99

1.00

1.01

–20 0 20 40

5100 G21

60 80

NORMALIZED TO UNITY AT 25°C

Imd_tc1 = Imd_tc2 = 0

Laser Modulation Current

vs Temperature, Im_rng = 1

TEMPERATURE (°C)

–40

0.97

MPP

(NORMALIZED)

0.98

0.99

1.00

1.01

–20 0 20 40

5100 G22

60 80

NORMALIZED TO UNITY AT 25°C

Im_tc1 = Im_tc2 = 0

Rise and Fall Times vs IMat the

Midpoint of Each Im_rng Deterministic Jitter vs IMPP for

Im_rng = 3

MPP

(mA)

20% TO 80% RISE AND FALL TIMES (ps)

36912

5100 G13

Im_rng

FALL

RISE

Im_rng

MPP

(mA)

20% TO 80% RISE AND FALL TIMES (ps)

612 15 27

5100 G14

39 18 21 24

FALL

RISE

MPP

(mA)

DETERMINISTIC JITTER (ps)

5100 G15

0612 18

327

915 21

Rise and Fall Times

vs IMPP for Im_rng = 3

LTC5100

sn5100 5100fs

TYPICAL PERFOR A CE CHARACTERISTICS

VDD = VDD(HS) = 3.3V, TA= 25°C, Cml_en = 0, Lpc_en = 1, transmitter enabled, unless otherwise noted.

Transmitter Enable

5µs/DIV

5100 G26

FAULT

LASER OUTPUT

Transmitter Disable

5µs/DIV

5100 G27

FAULT

LASER OUTPUT

Transmitter Enable, Rapid Restart

10µs/DIV

5100 G28

FAULT

LASER OUTPUT

Response to Fault Fault Recovery Time

10µs/DIV

5100 G29

FAULT

LASER OUTPUT

10ms/DIV

5100 G30

FAULT

LASER OUTPUT

5µs WIDE

PULSE ON EN

Hot Plug with EN Active in

CCC Mode

10ms/DIV

5100 G23

SCL

FAULT

LASER OUTPUT

Hot Plug with EN Active in

APC Mode

10ms/DIV

5100 G24

SCL

FAULT

LASER OUTPUT

Start-Up with Slow Ramping

Supply in APC Mode

10ms/DIV

5100 G25

FAULT

LASER OUTPUT

EEPROM READ

SCL

Table of contents

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