FDL300D ETC, FDL300D Datasheet - Page 4

• Manufacturer Part Number: FDL300D
• Description: Fiber Optic Transceiver Solution for Seamless Digital to Light/ Light to Digital Conversion
• Manufacturer: ETC

FDL300E/FDL300D (Preliminary) Revision P13
Firecomms assumes no responsibility for inaccuracies or omissions in the information
contained in this document. Specifications are subject to change without notice.
No patent rights are granted to any of the circuits described herein.
Function
Sleep-State
Note:
1. TP2, test point 2, is the standard test point representing a point in an optical link located 50cm into the fiber from the transmitter
Parameter
Peak Wavelength (T
Spectral Bandwidth (FWHM)
Average Output Power Coupled
into Plastic Fiber at T
Optical Rise Time, S200 (20%-80%)
Optical Fall Time (80%-20%)
Extinction Ratio
Maximum Systematic Jitter,
Light Output at TP2
Maximum Random Jitter,
Light Output at TP2
side. This is a standard point of reference quoted in the IEEE 1394b and IDB-1394 standards.
Rex
Description
The function of the Rex pin is to allow the user to adjust the optical power of the FOT by changing the drive
current of the RCLED. The pin has three settings:
(1) Rex is pulled to ground (set to low). This is the default position and in this case the part is set to the
(2) The Rex pin is pulled high (set to rail voltage 3.3V). The power of the FOT is reduced by 3 dBm. This
(3) The drive current of the device can be externally set and varied at will by placing a 15k Ohm variable
If the FOT does not see data on its differential pins for more than 5 us, the FOT is switched into a sleep state
where the optical output is switched off and the current consumption is reduced to a maximum of 20uA. For a
full description, refer to the section Power Management Functions .
[1]
[1]
A
=-20 to 70ºC)
A
internal default drive current of the FOT. This is the recommended setting for normal operation.
function can be used by a system designer to perform an end of life test.
resistor between Rex and ground. It is not recommended to use this for standard operation, especially in
applications that are sensitive to current consumption as the external variable resistor can cause higher
than normal current consumption.
=-20 to 70ºC
T R A N S M I T T E R O P T I C A L C H A R A C T E R I S T I C S
T R A N S M I T T E R S P E C I A L F U N C T I O N S
Symbol
λ
S200
S200
∆λ
R
peak
P
t
t
r
f
E
Minimum
-8.5
640
10
Typical
660
1.5
2.0
23
Maximum
0.855
0.855
-2.0
670
2.0
3.0
30
FDL300E/FDL300D
Unit
dBm
nm
nm
dB
ns
ns
ns
ns
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