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参数资料
| 型号： | ADN2871ACPZ-RL |
| 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： | 5,000 |
| 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： | 32mA |
| 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 |
ADN2871
ALARMS
The ADN2871 has a latched, active high monitoring alarm
(FAIL). The FAIL alarm output is an open drain in conformance
to SFP MSA specification requirements.
The ADN2871 has a three-fold alarm system that covers
? Use of a bias current higher than expected, probably as a
result of laser aging.
? Out-of-bounds average voltage at the monitor photodiode
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 transistor’s V BE clamps the FAIL voltage to below
1.3 V disabling the automatic shutdown of bias and modulation
currents. If an alarm has triggered and FAIL is activated, ALS
can be brought high and then low to clear the alarm.
V CC
LED
D1
(MPD) input, indicating an excessive amount of laser
power or a broken loop.
R1
10k Ω
R2
330 Ω
?
Undervoltage in the IBIAS node (laser diode cathode) that
would increase the laser power.
FAIL
ADN2871
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
activated when the single-point faults in Table 5 occur. The
Table 5. ADN2871 Single-Point Alarms
Figure 37. FAIL Indication Circuit
Alarm Type
Bias Current
MPD Current
Crucial Nodes
Mnemonic
IBMON
PAVSET
ERREF (the ERRREF
designed tied to
Overvoltage or Short to V CC Condition
Alarm if > 1.2 V typical (±10% tolerance)
Alarm if > threshold (typical threshold: 1.5 V to 2.1 V)
Alarm if shorted to V CC (the alarm is valid for
voltage setting mode only)
Undervoltage or Short to GND Condition
Ignore
Alarm if < threshold (typical threshold: 0.6 V to 1.1 V)
Ignore
V CC in resistor
setting mode)
IBIAS
Ignore
Alarm if shorted to GND
Table 6. ADN2871 Response to Various Single-Point Faults in AC-Coupled Configuration (as shown in Figure 35)
Pin
CCBIAS
PAVSET
PAVREF
Short to V CC
Fault state occurs
Fault state occurs
Voltage mode: Fault state occurs
Resistor mode: Tied to V CC
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
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
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. A | Page 18 of 20
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