LTC5100EUF datasheet(37/52 Pages) LINER

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LTC5100

sn5100 5100fs

Table 12. Register: IB (IMD)—Laser Bias Current Register (Monitor Diode Current in APC Mode) (I2C Command Code 0x15)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:12

.Is_rng

Source Current Range

Is_rng Sets the Full-Scale Range of the SRC Pin Current. The Table Below Shows the Available Ranges.

Values for Is_rng

Nominal Full-

Binary

Decimal

Scale SRC Pin

Value

Current (mA)

See the Electrical Specifications for Guaranteed Limits in Each Range.

.Ib_nom

Bias Current or Monitor Diode Current Setting at the Nominal Temperature

(.Imd_nom in

This Bit Field has Different Functions Depending on Apc_en.

APC Mode)

This Bit Field is an Unsigned 10-Bit Integer.

Constant Current Control (CCC) Mode (Apc_en = 0): Ib_nom Sets the Laser Bias Current at

Temperature T = T_nom. The physical Bias Current at T_nom is Given by:

(typical)

Automatic Power Control (APC) Mode (Apc_en = 1): Imd_nom Sets the Monitor Diode Current at the

Temperature T = T_nom. The Physical Monitor Diode Current at T_nom is Given by:

Ib_nom

1024

•( _

) •

Is rng

+ 19

d nom

drng

=µ









425

1024

•

• exp ln( )•

Im _

Table 13. Register: IB_TC1 (IMD_TC1)—Laser Bias/Monitor Diode Current First Order Temperature Coefficient

(I2C Command Code 0x16)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:8

.Ib_tc1 (.Imd_tc1

First Order Temperature Coefficient for Bias Current or Monitor Diode Current

in APC Mode)

This Bit Field is a Signed 8-Bit, Two’s Complement Integer. Thus its Value Ranges from –128 to 127.

This Bit Field has Different Functions Depending on Apc_en.

Constant Current Control (CCC) Mode (Apc_en = 0): Ib_tc1 Sets the First Order Temperature

Coefficient for the Laser Bias Current. The Nominal Scaling is 2–13/

°C or 122ppm/°C per LSB.

Automatic Power Control (APC) Mode (Apc_en = 1): Imd_tc1 Sets the First Order Temperature

Coefficient for the Monitor Diode Current. See Laser Bias Current Control in APC Mode

in the Operation Section for Details.

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