LTC5100 datasheet(43/52 Pages) LINER

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LTC5100

sn5100 5100fs

Table 22. Register: IB_LIMIT—Laser Bias Current Limit (I2C Command Code 0x11)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:7

.Ib_limit

Laser Bias Current Limit

This Bit Field is an Unsigned 7-Bit Integer

Sets the Detection Level for an Over_current Fault. When the Laser Bias Current Exceeds This Level an

Over_current Fault is Generated (Provided Over_current_en is Set).

The Physical Bias Current Level is Given By:

Ib_limit

128

B(LIMIT)

•( _

)•

(

)

Is rng

mA typical

+ 19

Table 23. Register: USER_ADC—Writing (I2C Command Code 0x18)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:3

.Adc_src_sel

ADC Source Select

Selects the Signal to be Converted by the ADC During the User ADC Cycle

User ADC Signal Sources

Signal

Select

Signal

(Binary)

Name

Description

Scaling

000

Source Current (SRC Pin IS = ADC_code/1024 • (Is_rng + 1) • 9mA

Current)

001

Average Modulation

IM = ADC_code/1024 • (Im_rng + 1) • 9mA

Current (MODA +MODB

Pin Current)

010

VLD

Laser Diode Voltage

VLD = ADC_code/1024 • 3.5V

011

IMD

Monitor Diode Current

IMD = 4.25µA • 4lmd_rng • exp[In(8) • ADC_code/

1024]

100

Temperature

°C) = ADC_code • 0.5°C – 273°C

101

VTERM

Termination Resistor

VTERM = ADC_code/1024 • (Is_rng + 1) • 400mV

Voltage

110

Reserved Reserved

111

Reserved Reserved

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