LTC5100EUF datasheet(36/52 Pages) LINER

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LTC5100

sn5100 5100fs

Table 9. Register: LOOP_GAIN—Control Loop Gain (I2C Command Code 0x1E)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:8

.Ib_gain

Bias Current or APC Loop Gain

(.Apc_gain in APC

This Bit Field Modifies the Open-Loop Gain of the Bias Current Servo Control Loop. The Effect of This

Mode)

Bit Field Differs in Constant Current Control (CCC) Mode and in Automatic Power Control (APC) Mode.

In CCC Mode, This Bit Field is Called lb_gain. In APC Mode, This Bit Field is Called Apc_gain.

Constant Current Control (CCC) Mode (Apc_en = 0): The Loop Gain and Settling Time are Independent

of Is_rng. The Default Value of Ib_gain Yields Stable but Slow Settling of the Laser Bias Current for

Any Value of Is_rng.

Automatic Power Control (APC) Mode (Apc_en = 1): The Open-Loop Gain of the Bias Current Servo

Loop Depends on the Value of Is_rng. The Default Value of Apc_gain Yields Stable but Potentially Slow

Settling of the Laser Bias Current for any Value of Is_rng.

Im_gain

Modulation Current Loop Gain

This Bit Field Modifies the Open-Loop Gain of the Modulation Current Servo Loop. The Open-Loop.

Gain is Approximately Im_gain/32. The Loop Gain and Settling Time are Independent of Im_rng. The

Default Value of Im_gain Yields Stable but Slow Settling of the Laser Modulation Current.

Table 10. Register: PEAKING—High Speed Modulation Peaking (I2C Command Code 0x1F)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:5

.Peaking

Peaking Control for the Modulation Output

This Bit Field Controls the High Speed Peaking of the Modulation Output. Decreasing the Value of

Peaking Increases the Undershoot on the Falling Edge of the Modulation Signal. The Peaking Control

can be Used to Compensate for Slow Laser Turn-Off Characteristics.

Table 11. Register: Reserved—Reserved for Internal Use. This Register is for Test Puposes Only. Do Not Write to this Register

(I2C Command Code 0x08)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:7

.Reserved

Reserved for Internal Use, Do Not Write.

.Reserved

Reserved for Internal Use, Do Not Write.

LTC5100EUF Datasheet(PDF) 36 Page - Linear Technology

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