HFCT-5963NG Avago Technologies US Inc., HFCT-5963NG Datasheet - Page 2

• Manufacturer Part Number: HFCT-5963NG
• Manufacturer: Avago Technologies US Inc.

Specifications of HFCT-5963NG

• Optical Fiber Type: TX/RX
• Data Transfer Rate: 155Mbps
• Optical Rise Time: 2ns
• Optical Fall Time: 2ns
• Operating Temperature Classification: Commercial
• Peak Wavelength: 1360/1580nm
• Package Type: DIP With Connector
• Operating Supply Voltage (min): 3.1V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.5V
• Output Current: 50mA
• Operating Temp Range: -5C to 70C
• Mounting: Snap Fit To Panel
• Pin Count: 10
• Lead Free Status / RoHS Status: Compliant

Figure 1. Receiver Block Diagram
Functional Description
Receiver Section
Design
The receiver section for the HFCT-5963TL/TG/NL/NG/
ATL/ATG contains an InGaAs/InP photo detector and a
preamplifier mounted in an optical subassembly. This
optical subassembly is coupled to a postamp/decision
circuit on a circuit board. The design of the optical as-
sembly is such that it provides better than 14 dB Optical
Return Loss (ORL).
The postamplifier is ac coupled to the preamplifier as
illustrated in Figure 1. The coupling capacitors are large
enough to pass the SONET/SDH test pattern at 155 Mb/
s without significant distortion or performance penalty.
If a lower signal rate, or a code which has significantly
more low frequency content is used, sensitivity, jitter
and pulse distortion could be degraded.
Figure 1 also shows a filter function which limits the
bandwidth of the preamp output signal. The filter is de-
signed to bandlimit the preamp output noise and thus
improve the receiver sensitivity.
These components will reduce the sensitivity of the re-
ceiver as the signal bit rate is increased above 155 Mb/s.
2
TRANS-
IMPEDANCE
PRE-
AMPLIFIER
GND
FILTER
AMPLIFIER
CIRCUIT
SIGNAL
DETECT
Noise Immunity
The receiver includes internal circuit components to
filter power supply noise. However under some condi-
tions of EMI and power supply noise, external power
supply filtering may be necessary (see Application Sec-
tion).
The Signal Detect Circuit
The signal detect circuit works by sensing the level of
the received signal and comparing this level to a refer-
ence. The SD output is +3.3 V TTL.
LVPECL
OUTPUT
BUFFER
LVTTL
OUTPUT
BUFFER
DATA OUT
DATA OUT
SD