LTC5100EUF datasheet(46/52 Pages) LINER

46 / 52 page

LTC5100

sn5100 5100fs

Table 29. Register: IM_DAC—Modulation Current DAC (I2C Command Code 0x02)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:10

.Im_dac

DAC Setting for the Peak-to-Peak Modulation Current (the Combined MODA and MODB Pin Currents)

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

Table 30. Register: PWR_LIMIT_DAC—Optical Power Limit DAC—Read Only (I2C Command Code 0x03)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:7

.pwr_limit_dac

DAC Setting for the Over and Underpower Fault Detection Comparator (Read Only)

Read Only

This Bit Field Has Different Functions Depending on Apc_en.

Constant Current Control (CCC) Mode (Apc_en = 0): Pwr_limit_dac Has No Function in This Mode.

Its Contents are Undefined.

Automatic Power Control (APC) Mode (Apc_en = 1): Pwr_limit_dac Tracks the Value of the Monitor

Diode Current. The Laser Power Controller Continuously Updates the PWR_LIMIT_DAC with the

Most Recent ADC Reading of Imd. Reading the DAC Will Return the Value of Imd_adc Shifted Right

by Three Bits.

Im_dac

1024

•(Im_

)•

(

)

rng

mA typical

+ 19

LTC5100EUF 데이터시트(PDF) 46 Page - Linear Technology