LTC5100 datasheet(45/52 Pages) LINER

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LTC5100

sn5100 5100fs

Table 26. Register: IM_ADC—Modulation Current ADC (I2C Command Code 0x06)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:10

.Im_adc

ADC Reading of the Modulation Current (10-Bit Unsigned Integer)

Im_adc Contains the Last ADC Conversion of the Average Modulation Current Delivered at the MODA

and MODB Pins. (The MODA and MODB Pins are Tied Together On-Chip.) The Peak-to-Peak Current

s Twice the Average Current for a Data Stream with 50% Duty Cycle. The Modulation Current

Reaching the Laser Depends on its Resistance Relative to the Termination Resistor.

The Average Physical Current at the MODA and MODB Pins is Given By:

Table 27. Register: IS_ADC (IMD_ADC)—Source Current/Monitor Diode Current ADC (I2C Command Code 0x07)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:10

.Is_adc

ADC Reading of the SRC Pin Current or Monitor Diode Current

(.Imd_adc in

This Bit Field Has Different Functions Depending on Apc_en.

APC Mode)

Constant Current Control (CCC) Mode (Apc_en = 0): Is_adc Contains the Last ADC Conversion of

the SRC Pin Current. The Physical SRC Pin Current is Given By:

Automatic Power Control (APC) Mode (Apc_en = 1): Imd_adc Contains the Last ADC Conversion of

the Monitor Diode Current. The Physical Monitor Diode Current is Given By:

ADC_code

1024

•( _

)•

(

)

Is rng

mA typical

+ 19

A • 4

Imd_rng

425

1024

• exp

( )•













ADC code

Table 28. Register: IS_DAC—Souce Current DAC (I2C Command Code 0x01)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:10

.Is_dac

DAC Setting for the Source Current (the SRC Pin Current)

Read Access to This DAC is Always Available. Write Access is Only Valid if LPC_en = 0.

Is_dac

1024

•( _

)•

(

)

Is rng

mA typical

+ 19

ADC_code

1024

•(Im_

)•

(

)

rng

mA typical

+ 19

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