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AD9661AKR-REEL Arkusz danych(PDF) 9 Page - Analog Devices

Numer części AD9661AKR-REEL
Szczegółowy opis  Laser Diode Driver with Light Power Control
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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AD9661AKR-REEL Arkusz danych(HTML) 9 Page - Analog Devices

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AD9661A
REV. 0
–9–
Choosing a hold caps based on this:
CHOLD =
18
×10–9 ×0.5ms
266.6
µA
= 0.034 µF
The initial calibration time for < 0.1% error:
7
τ= 7 × RC = 7 × 550 Ω× 0.034 µF = 130.9 µs
Recalibration for a 0.1% error after 2% droop (need to
correct within 5%):
3
τ = 3 RC = 3 × 140 Ω × 0.034 µF = 14.28 µs
From the monitor current specification and the max power
specified:
I
MONITOR MAX = 4 mW
0.2 mA
mW
= 800 µA
and
R
GAIN =
1.6 V
I
MONITOR MAX
–50
Ω= 2.0 kΩ
•CGAIN would be chosen from the table as 3 pF for safe
compensation.
1ns/DIV
20ns/DIV
PULSE INPUT (TTL)
LASER POWER
20mV/DIV
LASER POWER
20mV/DIV
Figure 7. Driving 78N20 Laser Diode @ 5 mW
Typical Performance Characteristics


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