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| 型号： | ADN2872ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC LASR DVR 3.3GBPS 3.3V 24LFCSP |
| 标准包装： | 1 |
| 类型： | 激光二极管驱动器 |
| 数据速率： | 3.3Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 30mA |
| 电流 - 调制： | 90mA |
| 电流 - 偏置： | 100mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 24-LFCSP-VQ（4x4） |
| 包装： | 标准包装 |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 788 (CN2011-ZH PDF) |
| 其它名称： | ADN2872ACPZ-RLDKR |
ADN2872
ALARMS
The ADN2872 has a latched active high monitoring alarm
(FAIL). The FAIL alarm output is an open drain in conformance
with SFP MSA specification requirements.
The ADN2872 has a three-fold alarm system that covers:
The bias current alarm trip point is set by selecting the value of
resistor on the IBMON pin to GND. The alarm is triggered
when the voltage on the IBMON pin goes above 1.2 V.
FAIL is activated when the single-point faults in Table 5 occur.
?
?
?
Use of a bias current higher than expected, likely as a result
of laser aging.
Out-of-bounds average voltage at the monitor photodiode
(MPD) input, indicating an excessive amount of laser
power or a broken loop.
Undervoltage in the IBIAS pin (laser diode cathode) that
increases the laser power.
Table 5. ADN2872 Single-Point Alarms
Undervoltage or Short to
Alarm Type
Bias Current
MPD Current
Crucial Nodes
Mnemonic
IBMON
PAVSET
ERREF (the ERRREF is designed tied to
V CC in resistor setting mode)
IBIAS
Overvoltage or Short to V CC Condition
Alarm if > 1.2 V
Alarm if > 2.0 V
Alarm if shorted to V CC (the alarm is valid for
voltage setting mode only)
Ignore
GND Condition
Ignore
Alarm if < 0.4 V
Alarm if shorted to GND
Alarm if < 0.6 V
Table 6. ADN2872 Response to Various Single-Point Faults in AC-Coupled Configuration, as Shown in Figure 32
Mnemonic
CCBIAS
PAVSET
PAVREF
Short to V CC
Fault state occurs
Fault state occurs
Voltage mode: fault state occurs
Short to GND
Fault state occurs
Fault state occurs
Fault state occurs
Open
Does not increase laser average power
Fault state occurs
Fault state occurs
Resistor mode: tied to V CC
RPAV
Voltage mode: fault state occurs
Resistor mode: tied to V CC
Fault state occurs
Voltage mode: fault state occurs
Resistor mode: does not increase
average power
ERCAP
PAVCAP
DATAP
DATAN
ALS
ERSET
IMMON
ERREF
Does not increase laser average power
Fault state occurs
Does not increase laser average power
Does not increase laser average power
Output currents shut off
Does not increase laser average power
Does not affect laser power
Voltage mode: fault state occurs
Does not increase laser average power
Fault state occurs
Does not increase laser average power
Does not increase laser average power
Normal currents
Does not increase laser average power
Does not increase laser average power
Voltage mode: does not increase
Does not increase laser average power
Fault state occurs
Does not increase laser average power
Does not increase laser average power
Output currents shut off
Does not increase laser average power
Does not increase laser average power
Does not increase laser average power
average power
Resistor mode: tied to V CC
Resistor mode: fault state occurs
IBMON
FAIL
IMODP
IMODN
IBIAS
Fault state occurs
Fault state occurs
Does not increase laser average power
Does not increase laser average power
Fault state occurs
Does not increase laser average power
Does not increase laser average power
Does not increase laser average power
Does not increase laser average power
Fault state occurs
Does not increase laser average power
Does not increase laser average power
Does not increase laser average power
Does not increase laser power
Fault state occurs
Rev. 0 | Page 16 of 20
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相关代理商/技术参数 |
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| ADN2873 | 制造商:AD 制造商全称:Analog Devices 功能描述:3.3 V, 50 Mbps to 4.25 Gbps, Single-Loop, Laser Diode Driver |
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