LTC5100 datasheet(6/52 Pages) LINER

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LTC5100

sn5100 5100fs

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); 49.9Ω, 1%

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

Ω, 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 VDD and VDD(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, IS, plus any current sinked from IN+ and

IN–.

Note 3: The peak transient voltage at the IN+ and IN– pins must not

exceed the range of –300mV to VDD(HS) + 300mV.

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

Ω

differential with 50k common mode to VDD(HS)/2.

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

VDD(HS)/2 with the inputs tied together.

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

Ω

to VDD(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 IB = IS – IM. 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. IM refers to the

total average current at the MODA and MODB pins. IMPP refers to the total

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

from the laser modulation current, IMOD. IMPP splits between the laser and

the termination resistor according to IMOD = IMPP • RT/(RT + RLD), where

RT is the value of the termination resistor and RLD is the dynamic

resistance of the laser diode.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SCL, SDA

SCL, SDA Input Low Voltage, VIL

–0.5

0.3 •

VDD

SCL, SDA Input High Voltage, VIH

0.7 •

VDD +V

VDD

0.5

SCL, SDA Input Low Current (Note 21)

VSDA, VSCL = 0.1 • VDD

–100

µA

SCL, SDA Input High Current (Note 21)

VSDA, VSCL = 0.9 • VDD

–100

µA

SCL, SDA Output Low Voltage

IOL = 3mA

0.4

Hysteresis

280

Serial Interface Timing (Note 20)

SCL Clock Frequency

100

kHz

Hold Time (Repeated) START Condition. After This

µs

Period the First Clock Pulse is Generated

Low Period of the SCL Clock

4.7

µs

High Period of the SCL Clock

µs

Set-Up Time for a Repeated START Condition

4.7

µs

Data Hold Time

3.45

µs

Data Set-Up Time

250

Input Rise Time of Both SDA and SCL Signals

1000

Output Fall Time of SCL and SDA from VIH(MIN) to

300

VIL(MAX) with a Bus Capacitance from 10pF to 400pF

Set-Up Time for STOP Condition

µs

Bus Free Time Between a STOP and START Condition

4.7

µs

Capacitive Load for Each Bus Line

400

Noise Margin at the LOW Level for Each Connected

0.1 •

Device (Including Hysteresis)

VDD

Noise Margin at the HIGH Level for Each Connected

0.2 •

Device (Including Hysteresis)

VDD

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