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參數資料
| 型號： | ADN2841 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:14; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:23; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:23-14 |
| 中文描述： | 雙回路50 Mbps.2.7 Gbps的激光二極管驅動器 |
| 文件頁數： | 7/12頁 |
| 文件大小： | 276K |
| 代理商： | ADN2841 |
REV. 0
ADN2841
–7–
The second photodiode current is mirrored to IMPDMON2
for wavelength control purposes and is summed internally for
the power control loop.
For single MPD circuits the MPD2 pin
is tied to GND.
This enables the system designer to use the two currents to
control the wavelength of the laser diode using various optical
filtering techniques inside the laser module.
If the monitor current functions IMPDMON and IMPDMON2
are not required, the IMPD and IMPD2 pins can be grounded
and the monitor photodiode output can be connected di-
rectly to PSET.
IDTONE (48-PIN LFCSP ONLY)
The IDTONE pin is supplied for fiber identification/supervisory
channels or control purposes in WDM. This pin modulates the
optical one level over a possible range of 2% of minimum IMOD
to 10% of maximum IMOD. The level of modulation is set by
connecting an external current sink between the IDTONE pin and
ground. There is a gain of two from this pin to the IMOD current.
Figure 3 shows how an AD9850/AD9851 DDS may be used
with the ADN2841 to allow fiber identification.
Note that using IDTONE during transmission may cause opti-
cal eye degradation.
DATA, CLOCK INPUTS
Data and Clock inputs are ac-coupled (10 nF recommended)
and terminated via a 100
internal resistor between DATAP
and DATAN, and also between CLKP and CLKN pins. There
is a high-impedance circuit to set the common-mode voltage
that is designed to change over temperature. It is recommended
that ac coupling be used to eliminate the need for matching
between common-mode voltages.
Figure 4. AC Coupling of Data Inputs
CCBIAS
CCBIAS should be connected to the BIAS pin if the laser diode is
connected to the ADN2841 using a capacitor. CCBIAS is a
current sink to GND.
AUTOMATIC LASER SHUTDOWN
The ADN2841 ALS allows compliance to ITU-T-G958
(11/94), section 9.7.
When ALS is logic high, both bias and modulation currents are
turned off.
Correct operation of ALS can be confirmed by the fail alarm
being raised when ALS is asserted. Note this is the only time
that DEGRADE will be low while FAIL is high.
Figure 3. Circuitry to Allow Fiber Identification
REF CLOCK
20MHz–
180MHz
CLKIN
AD9850/AD9851
DDS
R
SET
I
OUT
50
1.25mA–20mA
I
OUT
50
LP FILTER
(DC-COUPLED)
AD8602
10kHz–1MHz
0.125mA–2mA
BC550
500
50 A–800 A
1000
1300
BC550
37.5 A–600 A
IDTONE
ADN2841
IMMON
CONTROLLER
1/2
AD8602
1/2
ADN2841
R = 2.5k , DATA
R = 3k , CLK
TO FLIP-FLOPS
400 A TYP
DATAP
DATAN
V
REG
R
50
50
相關PDF資料 |
PDF描述 |
|---|---|
| ADN2841ACP-32 | Circular Connector; No. of Contacts:21; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:23; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:23-21 |
| ADN2841ACP-32-RL | Circular Connector; No. of Contacts:21; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:23; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:23-21 |
| ADN2841ACP-32-RL7 | Dual-Loop 50 Mbps.2.7 Gbps Laser Diode Driver |
| ADN2841ACP-48 | Dual-Loop 50 Mbps.2.7 Gbps Laser Diode Driver |
| ADN2841ACP-48-RL | Dual-Loop 50 Mbps.2.7 Gbps Laser Diode Driver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADN2841ACP-32 | 制造商:Analog Devices 功能描述:Laser Driver 2.7Gbps 1-CH 32-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:MULTI RATE 2.5 GB/S LASER DIODE DRIVER - Bulk 制造商:Analog Devices 功能描述:IC CONTROLLER WAVE LASER |
| ADN2841ACP-32-RL | 制造商:Analog Devices 功能描述:Laser Driver 2.7Gbps 1-CH 32-Pin LFCSP EP T/R |
| ADN2841ACP-32-RL7 | 制造商:Analog Devices 功能描述:Laser Driver 2.7Gbps 1-CH 32-Pin LFCSP EP T/R |
| ADN2841ACP-48 | 制造商:Analog Devices 功能描述:Laser Driver 2.7Gbps 1-CH 48-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:MULTI RATE 2.5 GB/S LASER DIODE DRIVER - Bulk |
| ADN2841ACP-48-RL | 制造商:Analog Devices 功能描述:Laser Driver 2.7Gbps 1-CH 48-Pin LFCSP EP T/R |
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