LTC5100EUF datasheet(35/52 Pages) LINER

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LTC5100

sn5100 5100fs

Table 8. Register: SYS_CONFIG—System Configuration (I2C Command Code 0x10)

RESET VALUE

.BITFIELD

BIT

(BIN)

FUNCTION AND VALUES

.Reserved

15:8

.Cml_en

Current Mode Logic Enable

0: Floating Differential Input Termination: 100

Ω Across IN+ and IN–

1: CML Compatible Input Termination: 50

Ω from IN+ to VDD(HS) and from IN– to VDD(HS)

.Md_polarity

Monitor Diode Polarity

0: Cathode Connected to the MD Pin, Sinking Current from the Pin

1: Anode Connected to the MD Pin, Sourcing Current Into the Pin

.Ext_temp_en

External Temperature Enable

Selects the Source of Temperature Measurements for Temperature Compensation.

0: Internal Temperature Sensor

1: Externally Supplied Through the Serial Interface

.Power_down_en

Power Down Enable

Allow Power Reduction When the Transmitter is Disabled.

0: No Power Reduction When the Transmitter is Disabled.

1: Reduce Power Consumption When Transmitter is Disabled by Turning Off the High Speed Amplifiers.

.Apc_en

Automatic Power Control Enable

Select the Means of Controlling the Laser Bias Current.

0: Constant Current Control

1: Automatic Power Control Using Feedback from the Monitor Diode

.En_polarity

EN Pin Polarity

Set the Input Polarity of the EN Pin.

0: Active Low: A Logic Low Input Level Enables the Transmitter.

1: Active High: A Logic High Input Level Enables the Transmitter.

Note: In order to Enable the Transmitter, Both the EN Pin and Soft_en Bit Must be Asserted.

.Soft_en

Soft Transmitter Enable

Enables Transmitter Through the Serial Interface.

0: Disable the Transmitter

1: Enable the Transmitter (if the EN Pin is Active)

Note: In order to Enable the Transmitter, Both the EN Pin and Soft_en Bit Must be Asserted.

.Operating_mode

Digital Operating Control Mode

Select Whether the LTC5100 Operates Autonomously or Under External Control.

0: Standalone Operation: Configuration Parameters are Loaded from an External EEPROM at Power Up.

1: Externally Controlled Operation: Configuration Parameters are Set by an External Microprocessor or

Test Computer.

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