LTC5100EUF datasheet(38/52 Pages) LINER

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LTC5100

sn5100 5100fs

Table 14. Register: IB_TC2 (IMD_TC2)—Laser Bias/Monitor Diode Current Second Order Temperature Coefficient

(I2C Command Code 0x17)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:8

.Ib_tc2 (.Imd_tc2

Second 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_tc2 Sets the Second Order Temperature

Coefficient for the Laser Bias Current. The Nominal Scaling is 2–18/

°C2 or 3.81ppm/°C2 per LSB.

Automatic Power Control (APC) Mode (Apc_en = 1): Imd_tc2 Sets the Second Order Temperature

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

in the Operation Section for Details.

Table 15. Register: IM—Laser Modulation Current (I2C Command Code 0x19)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:12

.Im_rng

Modulation Current Range

Im_rng Sets the Full-Scale Range of the Modulation Current

Binary

Decimal

Nominal Full-Scale MODA and MODB Pin Current

Value

Peak-to-Peak (mA)

Average (mA)

4.5

13.5

See the Electrical Specifications for Guaranteed Limits in Each Range.

These Currents Represent the Peak-to-Peak Current at the MODA and MODB Pins. (The MODA and

MODB Pins are Tied Together On Chip).

.Im_nom

Modulation Current Setting at the Nominal Temperature

This Bit Field is an Unsigned 10-Bit Integer. Im_nom Sets 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 is Twice the Average Current for a Data Stream with 50% Duty Cycle.

The Modulation Current Reaching the Laser Depends on its Dynamic Resistance Relative to the

Termination Resistor.

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