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| 型号： | ADN2873ACPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | IC LASER DRIVER 4.25GBPS 24LFCSP |
| 标准包装： | 1,500 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 4.25Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 31mA |
| 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： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
ADN2873
ALARMS
The ADN2873 has a latched, active high monitoring alarm
(FAIL). The FAIL alarm output is open drain in conformance
with SFP MSA specification requirements.
The ADN2873 has a three-fold alarm system that covers
activated when the single-point alarms in Table 5 occur. The
circuit in Figure 37 can be used to indicate that FAIL has been
activated while allowing the bias and modulation currents to
remain on. The V BE of the transistor clamps the FAIL voltage to
below 1.3 V, disabling the automatic shutdown of bias and modula-
tion currents. If an alarm has triggered and FAIL is activated,
?
?
Use of a bias current that is 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
ALS can be brought high and then low to clear the alarm.
V CC
LED
D1
?
power or a broken loop
Undervoltage in the IBIAS node (laser diode cathode) that
would increase the laser power
FAIL
R1
10k ?
R2
330 ?
Q1
NPN
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
Table 5. ADN2873 Single-Point Alarms
ADN2873
Figure 37. FAIL Indication Circuit
Alarm Type
Bias Current
MPD Current
Crucial
Nodes
Mnemonic
IBMON
PAVSET
ERREF (the ERRREF designed is tied
to V CC in resistor setting mode)
IBIAS
Overvoltage or Short to V CC Condition
Alarm if >1.2 V typical (±10% tolerance)
Alarm if >2.0 V
Alarm if shorted to V CC (the alarm is
valid for voltage setting mode only)
Ignore
Undervoltage or Short to GND Condition
Ignore
Alarm if <0. 4V
Ignore
Alarm if shorted to GND
Table 6. ADN2873 Response to Various Single-Point Faults in AC-Coupled Configuration ( as shown in Figure 35 and Figure 36)
Pin
PAVSET
PAVREF
Short to V CC
Fault state occurs
Voltage mode: fault state occurs
Resistor mode: tied to V CC
Short to GND
Fault state occurs
Fault state occurs
Open
Fault state occurs
Fault state occurs
Circuit designed to tie to V CC in resistor
setting mode, so no open case
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
PAVCAP
DATAP
DATAN
ALS
ERSET
IMMON
ERREF
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
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 average
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
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 18 of 20
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相关代理商/技术参数 |
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|---|---|
| ADN2873ACPZ-RL | 功能描述:IC LASER DRIVER 4.25GBPS 24LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 激光驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:激光二极管驱动器 数据速率:- 通道数:4 电源电压:3.3V 电流 - 电源:- 电流 - 调制:- 电流 - 偏置:- 工作温度:0°C ~ 70°C 封装/外壳:40-TQFN 裸露焊盘 供应商设备封装:40-TQFN EP 包装:托盘 安装类型:表面贴装 |
| ADN2873ACPZ-RL7 | 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 |
| ADN2873XCPZ | 功能描述:IC LASER DRIVER CSP 制造商:analog devices inc. 系列:* 零件状态:上次购买时间 标准包装:1 |
| ADN2880 | 制造商:AD 制造商全称:Analog Devices 功能描述:3.2 Gbps, 3.3 V, Low Noise, Transimpedance Amplifier |
| ADN2880ACHIPS | 制造商:Analog Devices 功能描述:3.2 GBPS 3.3V LOW NOISE TIA |
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