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參數(shù)資料
| 型號： | RGR2622-ST |
| 英文描述： | Fiber Optic “Light to Logic” Receiver with Clock Recovery |
| 中文描述： | 光纖“光的邏輯”接收機時鐘恢復(fù) |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 102K |
| 代理商： | RGR2622-ST |
408
Functional Description
Design
The receiver contains an InGaAsP
photodetector, transimpedance
amplifier and interface amplifier
circuit, including a clock recovery
and data retiming function. It is
designed with a multimode fiber
pigtail to allow maximum
flexibility in connector options.
The interface amplifier is ac
coupled to the preamplifier
circuit.
Terminating the Outputs
The data outputs of the RGR2622
are PECL compatible. Care
should be taken to match termin-
ation impedances to the intercon-
nect to minimize reflection
effects. In order to balance the
drive currents drawn from the
RGR2622 all serial data outputs
(DATA and DATA, CLOCK and
CLOCK) should be terminated
identically, even if only one
output is used.
This will lower the power supply
noise generated by the RGR2622
and improve performance at low
optical input power levels.
Power Supplies
The RGR2622 will operate to
specifications with a single +5 V
power supply (Pin 10 grounded).
The –5 V pin bias is provided to
maintain functional compatibility
with second sources.
Circuit Layout
The RGR2622 uses very high
bandwidth circuitry to achieve its
high level of performance. Care
must be taken to ensure stable
operation. The use of ground
planes and transmission line
interconnects is required. The use
of a standard evaluation board is
highly recommended for those
users who are not familiar with
these techniques.
Signal traces should conform to
ECL design rules to prevent
reflections and ringing from
degrading performance. Useful
guidelines are contained in ECL
manufacturer design manuals.
Manufacturing
The fiber pigtail on the device
requires normal fiber handling
considerations. Care should be
taken to avoid tight bends as well
as excessive tension on the fiber
pigtail.
The allowable temperature range
for the RGR2622 is limited by the
material used in the pigtail.
Exposure to temperatures over
+85
°
C is not recommended. Low
profile sockets or hand soldering
are recommended for this part.
Figure 1. Block Diagram.
MID
AMP
LOW PASS FILTER
PLL
CLOCK AND
DATA RECOVERY
V
CC
(+5 V)
GND (0 V)
ALARM
ALARM
DATA
DATA
CLOCK
CLOCK
V
NEG
(-5 V OR GND)
TI
AMP
+5 V
0 V
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