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参数资料
| 型号： | LTC5100EUF#TR |
| 厂商： | Linear Technology |
| 文件页数： | 28/52页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER VCSEL 3.2GBPS 16QFN |
| 标准包装： | 2,500 |
| 类型： | 激光二极管驱动器 |
| 数据速率： | 3.2Gbps |
| 通道数： | 1 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 电流 - 电源： | 54mA |
| 电流 - 调制： | 12mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（4x4） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
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LTC5100
OPERATIO
The EN pin and the Soft_en bit must both be active to
enable the transmitter, providing an extra degree of safety
and allowing full software control of the transmitter enable
function. As shown in Figure 6, the EN pin has a weak 10 μ A
current source that pulls it to the inactive state in case of
an accidental open on the pin. The EN and Soft_en bits are
inhibited until the LTC5100 has successfully loaded its
registers from an EEPROM or the Operating_mode bit has
been set, signaling that a microprocessor has assumed
control of the chip.
The first time the transmitter is enabled after initial power
up, the servo loops find the correct DAC settings for bias
and modulation current through a feedback process.
Initial settling is typically within 300ms. If the transmitter
is disabled and subsequently re-enabled, the previously
determined DAC settlings are restored. In this case set-
tling occurs typically within 1ms. This feature is called
“Rapid Restart” and can be overridden by setting the
Rapid – restart_en bit to zero.
Table 1. Fault Detection and Handling
The LTC5100 has sophisticated eye safety and fault han-
dling features. Five types of faults are detected: low supply
voltage, excessive laser bias current, overpower,
underpower and EEPROM memory load failure. Table 1
summarizes these five faults and how they are handled in
the LTC5100.
Faults are latched in compliance with GBIC requirements.
Faults can be independently enabled (except for low sup-
ply voltage and memory load failure) and are recorded in
an internal register for readout over the serial bus. If two
faults occur simultaneously, the fault with the highest
priority (see Table 1) is recorded in the FLT_STATUS
register. This register indicates the cause of the fault and
is cleared only when read (not when the fault itself is
cleared.) Low supply voltage and memory load failure are
considered hard faults and cannot be masked or overrid-
den. They prevent the transmitter from begin enabled until
they are cleared.
Normally, a fault automatically disables the transmitter
and shuts down the laser. In some systems it may be
desirable to allow data transmission to continue after a
FAULT TYPE
LASER
OVERCURRENT
LASER
OVERPOWER
LASER
UNDERPOWER
EEPROM MEMORY
LOAD FAULT
POWER SUPPLY
UNDERVOLTAGE
SOFTWARE
FORCED FAULT
Fault Occurs When
Laser Bias Current
Exceeds the Value
in the IB_LIMIT
Monitor Diode
Current is 50%
Greater Than the
Monitor Diode
Current is 50%
Less than the
EEPROM Load
Starts But Fails
to Complete
V DD Drops
Below 2.8V
The Flt_pin_override
and Force_flt Bits
are Set
Register
Set Point
Set Point
Priority
Cleared by
5
Yes
4
Yes
3
Yes
2
Yes
1
No
NA
Yes
Power-On Reset
Latched in the
Yes
Yes
Yes
Yes
Yes
No (Not Part of the
FLT_STATUS
Register
FLT_STATUS Register)
Cleared from the
Yes
Yes
Yes
Yes
Yes
No (Not Part of the
FLT_STATUS
Register on Read
FLT_STATUS Register)
Latched at the
Yes
Yes
Yes
Yes
No (The FAULT Pin
Yes (Actually Latched
FAULT Pin
Signals a Fault as
Long as the Supply
Voltage Remains
Too Low)
in the FLT_CONFIG
Register)
Enabled by
Over_current_en
Over_pwr_en
Under_pwr_en
Always Enabled
Always Enabled
Flt_pin_override
and Apc_en
and Apc_en
Glitch Rejection
4 μ s
4 μ s
4 μ s
NA
200mV Typical
NA
Hysteresis
sn5100 5100fs
28
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