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參數資料
| 型號： | AD9660KR |
| 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 |
| 文件頁數： | 9/12頁 |
| 文件大小： | 256K |
| 代理商： | AD9660KR |
AD9660
REV. 0
–9–
Example Calculations
The example below (in addition to the one included in the sec-
tions above) should guide users in choosing R
GAIN
, C
GAIN
, the
hold capacitor values, and worst case calibration times.
System Requirements:
Bias laser power: 4 mW Bias
±
5%
Write laser power: 25 mW
±
0.5%
Bias Hold Time: 1 ms
Write Hold Time: 1
μ
s
Laser diode/photo diode characteristics:
Laser efficiency 0.5 mA/mA
Monitor current: 5
μ
A/mA
From the laser power requirements and efficiency we can
estimate:
and
I
BIAS MAX
=
4
mW
×
(5%)/ 0.5
mW
mA
400.0
μ
A
I
WRITE MAX
=
25
mW
×
0.5%
(
)
/ 0.5
mW
mA
250
μ
A
Choosing hold caps based on these:
and
C
BIAS HOLD
=
18
×
10
9
×
1
ms
400
μ
A
=
0.045
μ
F
C
WRITE HOLD
=
18
×
10
9
×
1
μ
s
250
μ
A
=
72
pF
The bias loop initial calibration time for a <1% error:
5
τ
= 5
×
RC
= 5
×
550
×
0.045
μ
F
= 123.75
μ
s
Bias loop recalibration for a 1% error after 5% droop (need to
correct within 20%):
2
τ
= 2
×
RC
= 2
×
140
×
0.045
μ
F
= 12.6
μ
s
The write loop initial calibration time for <0.1% error:
7
τ
= 7
×
RC
= 7
×
550
×
72
pF
= 277.2
ns
Write loop re-calibration for a 0.1% error after 0.5% droop
(need to correct within 20%):
2
τ
=
RC
= 2
×
140
×
72
pF
= 20.2
ns
From the monitor current specification and the max power
specified:
I
MONITOR MAX
=
25
mW
5
μ
A
mW
and
=
125
μ
A
R
GAIN
=
1.6
V
1.85
×
I
MONITOR MAX
50
=
6.9
k
C
GAIN
would be chosen as 2 pF (see Table I).
Driving the Analog Inputs
The BIAS LEVEL and WRITE LEVEL inputs of the AD9660
drive the track and hold amplifiers and allow the user to adjust
the amount of output current as described above. The input
voltage range on both inputs is V
REF
to V
REF
+ 1.6 V, requiring
the user to create an offset of V
REF
for a ground based signal.
The circuit in Figure 9 will perform the level shift and scale the
output of a DAC whose output is from ground to a positive
voltage. This solution is attractive because both the DAC and
the op amp can run off a single +5 V supply, and the op amp
doesn’t have to swing rail to rail.
DAC1
DAC2
V
DAC1
V
DAC2
OP291
OP291
+5V
V
REF
+
V
DAC1
R2
BIAS LEVEL
V
REF
+
V
DAC2
R4
WRITE LEVEL
BIAS LEVEL
V
REF
WRITE LEVEL
AD9660
R1
R2
R3
R4
R3
R4
R1
R2
Figure 9. Driving the Analog Inputs
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9660KR-REEL | 制造商:Analog Devices 功能描述:Laser Driver 1-CH 28-Pin SOIC T/R 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| 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 |
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