HFBR-2412Z Avago Technologies US Inc., HFBR-2412Z Datasheet - Page 22

• Manufacturer Part Number: HFBR-2412Z
• Description: RECEIVER FIBER OPTIC 5MBD TTL ST
• Manufacturer: Avago Technologies US Inc.

Specifications of HFBR-2412Z

• Data Rate: 5MBd
• Voltage - Supply: 4.75 V ~ 5.25 V
• Power - Minimum Receivable: -25.4dBm
• Current - Supply: 10mA
• Function: Optical Receivers for Industrial Application, TTL Output
• Product: Receiver
• Wavelength: 820 nm
• Diode Capacitance: 55 pF
• Pulse Width Distortion: 2.5 ns
• Maximum Output Current: 25 mA
• Operating Supply Voltage: - 0.5 V to 7 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With: Multimode Fiber
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 516-2056

HFBR-24x6Z Low-Cost 125 MHz Receiver
Description
The HFBR-24x6Z fiber optic receiver is designed to
operate with the Avago Technologies HFBR-14xxZ fiber
optic transmitters and 50/ 125 µm, 62.5/125 µm, 100/
140 µm and 200 µm HCS® fiber optic cable. Consistent
coupling into the receiver is assured by the lensed
optical system (Figure 1). Response does not vary with
fiber size for core diameters of 100 µm or less.
The receiver output is an analog signal which allows
follow-on circuitry to be optimized for a variety of
distance/data rate requirements. Low-cost external
components can be used to convert the analog output
to logic compatible signal levels for various data
formats and data rates up to 175 MBd. This distance/
data rate trade-off results in increased optical power
budget at lower data rates which can be used for
additional distance or splices.
The HFBR-24x6Z receiver contains a PIN photodiode
and low noise transimpedance preamplifier integrated
circuit. The HFBR-24x6Z receives an optical signal and
converts it to an analog voltage. The output is a
buffered emitter follower. Because the signal amplitude
from the HFBR-24x6Z receiver is much larger than from
a simple PIN photodiode, it is less susceptible to EMI,
Figure 13. Simplified Schematic Diagram.
22
CAUTION: The small junction sizes inherent to the design of these components increase the components’ susceptibility to damage
from electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly of these
components to prevent damage and/or degradation which may be induced by ESD.
BIAS & FILTER
CIRCUITS
mA
5.0
300 pF
V OUT
especially at high signaling rates. For very noisy
environments, the conductive or metal port option is
recommended. A receiver dynamic range of 23 dB over
temperature is achievable (assuming 10-9 BER).
The frequency response is typically dc to 125 MHz.
Although the HFBR-24x6Z is an analog receiver, it is
compatible with digital systems. Please refer to
Application Bulletin 78 for simple and inexpensive
circuits that operate at 155 MBd or higher.
The recommended ac coupled receiver circuit is shown
in Figure 14. It is essential that a 10 ohm resistor be
connected between pin 6 and the power supply, and
a 0.1 mF ceramic bypass capacitor be connected
between the power supply and ground. In addition,
pin 6 should be filtered to protect the receiver from
noisy host systems. Refer to AN 1038, 1065, or AB 78
for details.
V CC
V EE
3, 7
6
2
POSITIVE
SUPPLY
ANALOG
SIGNAL
NEGATIVE
SUPPLY
Unhoused Product
Housed Product
BOTTOM VIEW
NOTES:
1. PINS 1, 4, 5 AND 8 ARE ISOLATED FROM THE INTERNAL
CIRCUITRY, BUT ARE ELECTRICALLY CONNECTED TO EACH
OTHER.
2. PINS 3 AND 7 ARE ELECTRICALLY CONNECTED TO HEADER
BOTTOM VIEW
1
4
PIN
1
2
3
4
5
6
7
8
1
2
1
1
2
1
2
3
FUNCTION
NC
SIGNAL
V
NC
NC
V
V
NC
4 5
3
2
1
EE
CC
EE
6
7
8
PIN 1 INDICATOR
2
6
3 & 7
V
ANALOG SIGNAL
V
PIN
1
2
3
4
cc
EE
FUNCTION
SIGNAL
V
V
V
EE
CC
EE