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参数资料
| 型号： | ADN2871ACPZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/20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： | 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
RESISTOR SETPOINT CALIBRATION
In resistor setpoint calibration, Pin PAVREF, Pin ERREF, and
Pin RPAV must all be tied to V CC . The average power and
extinction ratio can be set using the PAVSET and ERSET pins,
respectively. A resistor is placed between the pin and GND to
set the current flowing in each pin, as shown in Figure 30. The
ADN2871 ensures that both PAVSET and ERSET are kept 1.23 V
above GND. The PAVSET and ERSET resistors are given by
Method 2: Measuring I MPD Across a Sense Resistor
The second method has the advantage of providing a valid I MPD
reading at all times, but has the disadvantage of requiring a
differential measurement across a sense resistor directly in
series with the I MPD . As shown in Figure 32, a small resistor, Rx,
is placed in series with the I MPD . If the laser used in the design
has a pinout where the monitor photodiode cathode and the
lasers anode are not connected, a sense resistor, Rx, can be placed
R PAVSET =
R ERSET =
1 . 2 V
P AV × R SP
1 .2 V × 100
I MOD
where:
R SP is the optical responsivity (in amperes per watt).
I MOD is the modulation current required (mA).
P AV is the average power required (mW).
(Ω)
(Ω)
in series with the photodiode cathode and V CC , as shown in
must take into account the expected I MPD value in normal
operation. The resistor must be large enough to make a
significant signal for the buffered ADC to read, but small
enough not to cause a significant voltage reduction across the
I MPD . The voltage across the sense resistor should not exceed
250 mV when the laser is in normal operation. It is recommended
that a 10 pF capacitor be placed in parallel with the sense resistor.
V CC
Power-On Sequence in Resistor Setpoint Mode
After power-on, the ADN2871 starts an initial process sequence
that takes 25 ms before enabling the alarms. Therefore, the
PHOTODIODE
LD
resistors connected to Pin PAVSET and Pin ERSET should be
stabilized within 20 ms after power-on. If the PAVSET and
μC ADC
DIFFERENTIAL
INPUT
200 ?
Rx
10pF
ERSET resistors are connected to the ADN2871 20 ms after the
power supply is turned on, the ADN2871 alarm may kick in
and assert FAIL.
I MPD MONITORING
PAVSET
ADN2871
Figure 32. Differential Measurement of I MPD Across a Sense Resistor
I MPD monitoring can be implemented for voltage setpoint and
resistor setpoint as described next.
Voltage Setpoint
V CC
200 ?
Rx
V CC
LD
In voltage setpoint calibration, two methods can be used for
I MPD monitoring.
Method 1: Measuring Voltage at RPAV
The I MPD current is equal to the voltage at RPAV divided by the
value of RPAV (see Figure 31) as long as the laser is on and is
being controlled by the control loop. This method does not
provide a valid I MPD reading when the laser is in shutdown or
fail mode. A MicroConverter buffered ADC input can be
connected to RPAV to make this measurement. No decoupling
or filter capacitors should be placed on the RPAV node because
this can disturb the control loop.
V CC
PHOTODIODE
PAVSET
ADN2871
μC ADC
INPUT
PHOTODIODE
PAVSET
ADN2871
Figure 33. Single Measurement of I MPD Across a Sense Resistor
μ C ADC
INPUT
RPAV
R
1k Ω
Figure 31. Single Measurement of I MPD at RPAV in Voltage Setpoint Mode
Rev. A | Page 15 of 20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADN2872 | 制造商:AD 制造商全称:Analog Devices 功能描述:3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver |
| ADN2872ACPZ | 功能描述:IC LSR DVR 3.3GBPS 3.3V 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 |
| ADN2872ACPZ-R7 | 功能描述:IC LASR DVR 3.3GBPS 3.3V 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 |
| ADN2872ACPZ-RL | 功能描述:IC LASR DVR 3.3GBPS 3.3V 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 |
| 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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