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參數(shù)資料
| 型號(hào)： | AD9660KR-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 其它接口 |
| 英文描述： | 200 MHz Laser Diode Driver with Light Power Control |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PDSO28 |
| 封裝： | PLASTIC, SOIC-28 |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 256K |
| 代理商： | AD9660KR-REEL |
AD9660
REV. 0
–11–
The trace from the output pins of the AD9660 to the anode of
the laser (send trace) should be several millimeters wide and
should be as direct as possible. The return current will choose
the path of least resistance. If the return path is the ground
plane, it should have an unbroken path, under the output trace,
from the laser cathode back to the AD9660. If the return path is
not the ground plane (such as on a two layer board, or on the
+V
S
plane), it should still be on the board plane adjacent to the
plane of the output trace. If the current cannot return along a
path that follows the output trace, the inductance will be drasti-
cally increased and performance will be degraded.
Optimizing the Feedback Layout
In applications where the dynamic performance of the analog
feedback loop is important, it is necessary to optimize the layout
of the gain resistor, R
GAIN
, as well as the monitor current path to
SENSE IN. Such applications include MOD systems which
recalibrate the write loop on pulses as short as 25 ns, and closed
loop applications.
The best possible TZA settling will be achieved by using a
single carbon surface mount resistor (usually 5% tolerance) for
R
GAIN
and small surface mount capacitor for C
GAIN
. Because the
GAIN pin (Pin 9) is essentially connected to the inverting input
of the TZA, it is very sensitive to stray capacitance. R
GAIN
should be placed between Pin 9 and Pin 10, as close as possible
to Pin 9. Small traces should be used, and the ground and +V
S
planes adjacent to the trace should be removed to further mini-
mize stray capacitance.
The trace from SENSE IN to the cathode of the PIN photo-
detector should be thin and routed away from the laser anode
trace.
GROUND PLANE
BYPASS CAPS
GROUND PIN
CONNECTIONS
OUTPUT PIN CONNECTIONS
PIN ASSIGNMENTS
+V
S
PIN CONNECTIONS
25
24
23
22
21
20
19
MUTUAL COUPLING
REDUCES INDUCTANCE
4
3
2
1
LASER DIODE CURRENT
PATH SEGMENTS
(SEE TEXT)
5
AD9660
Figure 11. Laser Diode Current Loop
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD9660 | 200 MHz Laser Diode Driver with Light Power Control |
| AD9660KR | 200 MHz Laser Diode Driver with Light Power Control |
| AD9661A | Laser Diode Driver with Light Power Control(帶光功率控制的激光二極管驅(qū)動(dòng)器) |
| AD9664 | 4-Channel LVDS Dual-Output Laser Diode Driver with Oscillator |
| AD96685 | Ultrafast Comparators |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9661A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Laser Diode Driver with Light Power Control |
| AD9661AKR | 制造商:Rochester Electronics LLC 功能描述:DUAL POWER LDD - Bulk 制造商:Analog Devices 功能描述: |
| AD9661AKR-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Laser Diode Driver with Light Power Control |
| AD9662 | 制造商:Analog Devices 功能描述:- Bulk |
| AD9662ARQZ | 制造商:Analog Devices 功能描述:LASER DRVR 3-CH 16QSOP - Rail/Tube |
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