LTC5100EUF Linear Technology, LTC5100EUF Datasheet - Page 41

• Manufacturer Part Number: LTC5100EUF
• Description: IC DRIVER VCSEL 3.2GBPS 16QFN
• Manufacturer: Linear Technology
• Type: Laser Diode Driverr

Specifications of LTC5100EUF

• Data Rate: 3.2Gbps
• Number Of Channels: 1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Current - Supply: 54mA
• Current - Modulation: 12mA
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-QFN
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table 20. Register: FLT_CONFIG—Fault Configuration (Refer also to Table 1) (I
REGISTER
REGISTER DEFI ITIO S
.BITFIELD
.Reserved
Rep_flt_inhibit
Rapid_restart_en
Flt_drv_mode
Lpc_en
Auto_shutdn_en
Flt_pin_polarity
Flt_pin_override
Force_flt
Over_pwr_en
Under_pwr_en
Over_current_en
15:12
BIT
11
10
9
8
7
6
5
4
3
2
1
0
RESET VALUE
U
(BIN)
0
0
1
0
0
1
1
0
1
1
1
1
U
FUNCTION AND VALUES
Repeated Fault Inhibit
0: Allow Repeated Attempts to Clear a Fault and Re-enable the Transmitter.
1: Inhibit Repeated Attempts to Clear a Fault. Only One Attempt to Clear a Fault is Allowed. If the Fault
Rapid_restart_en
0: Rapid Restart Disabled: The Servo Controller Settings for the Laser Bias and Modulation Currents
1: Rapid Restart Enabled: The Servo Controller Settings for the Laser Bias and Modulation Currents are
FAULT Pin Drive Mode
00: Open Drain (3.3mA Sink Capability)
01: Open Drain, 280 A Internal Pull Up
10: Open Drain, 425 A Internal Pull Up
11: Push-Pull (3.3mA Source and Sink Capability)
Laser Power Controller (LPC) Enable
0: LPC Disabled: Allows External Control of the SRC_DAC and MOD_DAC Registers from the Serial
1: LPC Enabled: The LPC Continuously Updates the SRC_DAC and MOD_DAC Registers to Servo
Automatic Transmitter Shutdown Enable
0: Disabled: When a Fault Occurs the LTC5100 Continues to Drive the Laser. This Mode Allows a
1: Enabled: When a Fault Occurs, the Transmitter is Automatically Disabled.
FAULT Pin Polarity
0: Active Low: The FAULT Pin is Driven Low to Signal a Fault.
1: Active High: The FAULT Pin is Driven High to Signal a Fault.
FAULT Pin Override
0: The FAULT Pin is Driven Active when a Fault Occurs.
1: Internal Control of the FAULT Pin is Overridden. When a Fault Occurs, the Fault is Detected and
Force the FAULT Pin Output.
Force_flt Gives a Microprocessor or Test Computer Full Control of the FAULT Pin, Allowing External
Mediation of Fault Handling.
0: Force the FAULT Pin Inactive.
1: Force the FAULT Pin Active.
This Bit Has No Effect Unless Flt_pin_override = 1.
Enables Detection of a Laser Overpower Fault.
0: Disabled, 1: Enabled
Enables Detection of a Laser Underpower Fault.
0: Disabled, 1: Enabled
Enables Detection of a Laser Overcurrent Fault.
0: Disabled, 1 Enabled
Recurs Within 25ms of Re-enabling the Transmitter, the Transmitter is Disabled Until Power is
Cycled.
are Reset to Zero when the Transmitter is Disabled. When Re-enabled, the Laser Currents Start from
Zero and Settle Typically Within the 300ms Standard Initialization Time, t_int, from the GBIC
Specification.
Retained when the Transmitter is Disabled. When Re-enabled, the Retained Servo Values are Loaded
into the SRC_DAC and MOD_DAC, Allowing Settling Typically Within the 1ms Standard Turn-On
Time, t_on, from the GBIC Specification.
Interface. This Setting Gives an External Microprocessor or Test Computer Full Control of the
SRC_DAC and MOD_DAC Registers.
Control the Laser. (Any Values Written to These Registers Over the Serial Interface Will be
Overwritten by the LPC.)
Microprocessor or Test Computer to Mediate the Decision to Shut Down the Transmitter. The
Microprocessor can Turn Off the Transmitter by Driving the EN Pin Inactive or by Clearing the
Soft_en Bit in the SYS_CONFIG Register.
Latched Internally, but the FAULT Pin Remains Inactive. This Mode Allows a Microprocessor or Test
Computer to Mediate Fault Handling. The Microprocessor can Drive the FAULT Pin Active by Setting
the Force_flt Bit.
2
C Command Code 0x13)
LTC5100
sn5100 5100fs
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