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參數(shù)資料
| 型號(hào)： | ADN2830ACP32 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Continuous Wave Laser Average Power Controller |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, QCC32 |
| 封裝： | 5 X 5 MM, MO-220-VHHD-2, LFCSP-32 |
| 文件頁(yè)數(shù)： | 5/12頁(yè) |
| 文件大?。?/td> | 270K |
| 代理商： | ADN2830ACP32 |
REV. A
ADN2830
–5–
GENERAL
Laser diodes have current-in to light-out transfer functions as
shown in Figure 1. Two key characteristics of this transfer func-
tion are the threshold current, I
TH
, and slope in the linear region
beyond the threshold current, referred to as slope efficiency (LI).
P
I
LI =
P
I
I
TH
CURRENT
P
AV
O
Figure 1. Laser Transfer Function
CONTROL
A monitor photodiode (MPD) is required to control the laser
diode. The MPD current is fed into the ADN2830 to control
the power, continuously adjusting the bias current in response
to the laser’s changing threshold current and light to current
(LI) slope (slope efficiency).
The ADN2830 uses automatic power control (APC) to maintain
a constant power over time and temperature.
The average power is controlled by the R
PSET
resistor
connected between the PSET pin and ground. The PSET pin
is kept 1.23 V above GND. For an initial setup, the R
PSET
resis-
tor can be calculated using the following formula.
R
V
I
PSET
AV
=
1 23
.
where
I
AV
is average MPD current.
Note the I
PSET
will change from device to device. It is not
required to know exact values for LI and MPD optical coupling.
LOOP BANDWIDTH SELECTION
Capacitor values greater than 22 nF are used to set the actual
loop bandwidth. This capacitor is placed between the PAVCAP
pin and ground. It is important that the capacitor is a low leak-
age multilayer ceramic with an insulation resistance greater than
100 G
or a time constant of 1000 sec, whichever is less.
ALARMS
The ADN2830 has two active high alarms, DEGRADE and
FAIL. A resistor between ground and the ASET pin is used to
set the current at which these alarms are raised. The current
through the ASET resistor is a ratio of (
N
200):1 to the FAIL
alarm threshold (
N
is the number of ADN2830s in parallel).
The DEGRADE alarm will be raised at 90% of this level.
Example:
I
mA N
I
mA
FAIL
DEGRADE
=
= ∴
1
=
50
45
,
I
I
N
mA
A
ASET
BIASTRIP
×
=
=
=
μ
200
50
200
250
*
R
V
I
A
k
ASET
ASET
=
=
=
1 23
.
1 23
250
4 92
.
.
μ
The laser degrade alarm, DEGRADE, gives a warning of imminent
laser failure if the laser diode degrades further or environmental condi-
tions continue to stress the laser diode, e.g., increasing temperature.
The laser fail alarm, FAIL, is activated when:
The ASET threshold is reached.
The ALS pin is set high. This shuts off the modulation and
bias currents to the laser diode, resulting in the MPD current
dropping to zero.
DEGRADE will only be raised when the bias current exceeds
90% of the ASET current.
MONITOR CURRENTS
IBMON and IMPDMON are current controlled current sources
from V
CC
. They mirror the bias and MPD current for increased
monitoring functionality. An external resistor to GND gives a
voltage proportional to the current monitored. If the IMPDMON
function is not used, the IMPD pin must be grounded and the
monitor photodiode must be tied directly to the PSET pin.
AUTOMATIC LASER SHUTDOWN
When ALS is logic high, the bias current is turned off.
Correct
operation of ALS can be confirmed by the fail alarm being
raised when ALS is asserted. Note that this is the only time
DEGRADE will be low while FAIL is high.
MODE
The MODE feature on the ADN2830 allows the user to operate
more than one ADN2830 in parallel current boosting mode to
achieve up to
N
200 mA of bias current (
N
is the number of
ADN2830s in parallel). When using parallel boosting mode,
one
device is run as the master, the other as the slave. The
MODE
pin on the master is tied to ALS and the MODE pin on the
slave is tied high (see Figure 3 for reference circuit).
ALARM INTERFACES
The FAIL and DEGRADE outputs have an internal 30 k
pull-up resistor that is used to pull the digital high value to V
CC.
However, the alarm output may be overdriven with an external
resistor allowing the alarm interfacing to non-V
CC
levels.
Non-V
CC
alarm output levels must be below the V
CC
used for
the ADN2830.
*
The smallest value for R
ASET
is 1.2 k
, as this corresponds to the IBIAS
maximum of N 200 mA.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADN2841 | 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 |
| 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 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADN2830ACP32-REEL | 制造商:Analog Devices 功能描述:Laser Driver 1-CH 32-Pin LFCSP EP T/R |
| ADN2830ACP32-REEL7 | 制造商:Analog Devices 功能描述:Laser Driver 1-CH 32-Pin LFCSP EP T/R |
| ADN2830ACPZ32 | 功能描述:IC LASR CTRLR 1CHAN 5.5V 32LFCSP RoHS:是 類別:集成電路 (IC) >> PMIC - 激光驅(qū)動(dòng)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:激光二極管驅(qū)動(dòng)器 數(shù)據(jù)速率:- 通道數(shù):4 電源電壓:3.3V 電流 - 電源:- 電流 - 調(diào)制:- 電流 - 偏置:- 工作溫度:0°C ~ 70°C 封裝/外殼:40-TQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN EP 包裝:托盤(pán) 安裝類型:表面貼裝 |
| ADN2830-EVALZ | 制造商:Analog Devices 功能描述:EVAL KIT FOR CONTINUOUS WAVE LASER AVERAGE PWR CNTRLR - Bulk |
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