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参数资料
| 型号： | ADN2870ACPZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC LSR DRVR 3.3GPBS 3.6V 24LFCSP |
| 标准包装： | 1,500 |
| 类型： | 激光二极管驱动器（光纤） |
| 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： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
ADN2870
RESISTOR SETPOINT CALIBRATION
In resistor setpoint calibration, PAVREF, ERREF, and RPAV
pins must all be tied to VCC. 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 27. The ADN2870
ensures that both PAVSET and ERSET are kept 1.2 V above
GND. The resistors connected to PAVSET and ERSET 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 29, 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 can be placed in
series with the photodiode cathode and VCC, as shown in
R PAVSET =
1 . 23 V
P AV × R SP
(Ω)
must take into account the expected I MPD value in normal
operation. The resistor must be large enough to make a signifi-
ER ? 1
R ERSET =
I MPD _ CW
P CW
1 . 23 V
×
ER + 1
× P AV
(Ω)
cant signal for the buffered A/Ds to read, but small enough so
as not to cause a significant voltage reduction across the I MPD .
The voltage across the sense resistor should not exceed 250 mV
where:
R SP (A/W) is the monitor photodiode responsivity.
P CW (mW) is the dc optical power specified on the laser data
sheet.
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
I MPD_CW (mA) is MPD current at that specified P CW .
P AV (mW) is the average power required.
PHOTODIODE
LD
ER is the desired extinction ratio ( ER = P1/P0).
I MPD MONITORING
μC ADC
DIFFERENTIAL
INPUT
200 ?
RESISTOR
10pF
I MPD monitoring can be implemented for voltage setpoint and
resistor setpoint as described in the sections that follow.
Voltage Setpoint
PAVSET
ADN2870
Figure 29. Differential Measurement of I MPD Across a Sense Resistor
In voltage setpoint calibration, the following methods can be
used for I MPD monitoring.
V CC
V CC
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 28) as long as the laser is on and is
μC ADC
INPUT
200 ?
RESISTOR
LD
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 A/D input can be con-
nected 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
ADN2870
PHOTODIODE
PAVSET
ADN2870
Figure 30. Single Measurement of I MPD Across a Sense Resistor
Resistor Setpoint
In resistor setpoint calibration, the current through the resistor
from PAVSET to ground is the I MPD current. The recommended
method for measuring the I MPD current is to place a small
resistor in series with the PAVSET resistor (or potentiometer)
μC ADC
INPUT
R
1k ?
RPAV
The I MPD current is then equal to this voltage divided by the
value of resistor used. In resistor setpoint, PAVSET is held to
1.2 V nominal; it is recommended that the sense resistor be
Figure 28. Single Measurement of I MPD at RPAV in Voltage Setpoint Mode
selected so that the voltage across the sense resistor does not
exceed 250 mV.
Rev. A | Page 14 of 20
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相关代理商/技术参数 |
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|---|---|
| ADN2871 | 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 |
| ADN2871ACPZ | 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 |
| ADN2871ACPZ-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 |
| ADN2871ACPZ-RL7 | 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 |
| 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 |
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