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HFD3029
Schmitt Input, Non-Inverting TTL Output Receiver
FEATURES * Converts fiber optic input signals to TTL totem pole outputs * * * * * * * * Sensitivity is 1.5 W peak (-28.2 dBm) Single 5 V supply requirement Schmitt circuitry gives 17 dB dynamic range and low Pulse Width Distortion Operates up to 200K bps NRZ Plastic TO-18 cap Operates with Honeywell 850 nm LEDs and integrated transmitters Available mounted in wide variety of optical connector styles Available in metal package (HFD3009)
FIBER106.TIF
DESCRIPTION The HFD3029 is a sensitive Schmitt triggered optical receiver designed for use in short distance, 850 nm fiber optic systems. The bipolar integrated receiver circuit has internal voltage regulation. The HFD3029 also uses an internal photodiode. The TTL non-inverting output allows the HFD3029 to be directly interfaced with standard digital TTL circuits. APPLICATION The HFD3029 fiber optic receiver converts the optical signal in a point to point data communications fiber optic link to a TTL output. It is designed to be mounted in a fiber optic connector that aligns the optical axis of the component to the axis of the optical fiber. Its photodiode is mechanically centered within the TO-18 package. Electrical isolation is important in obtaining the maximum performance of this high sensitivity receiver. Shielding can reduce coupled noise and allow maximum sensitivity to be obtained. This can include the use of ground planes in the PCB, shielding around the device, and shielding around the leads. An internal voltage regulator allows operation with a 5 volt supply. An external bypass capacitor (0.1 F) between VUU (pin 1) and ground (pin 3) is recommended for maximum power supply noise rejection.
OUTLINE DIMENSIONS in inches (mm)
WINDOW .047 (1.19) DIA.
CRUSH RING .229 (5.82) .220 (5.59) .210 (5.33) .081 (2.06) .176 (4.47) .165 (4.19)
.500 MIN (12.7)
1 3
FIBER202.DIM
2
Pinout 1. VUU 2. Output (TTL) 3. Case (ground)
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Honeywell reserves the right to make changes in order to improve design and supply the best products possible.
HFD3029
Schmitt Input, Non-Inverting TTL Output Receiver
APPLICATION (continued) Honeywell also offers companion transmitters designed to operate in conjunction with the HFD3029. Optical power (photons) from the fiber strikes the photodiode and is converted to electrical current. The current is converted into voltage in the transimpedance preamplifier. The Schmitt trigger circuitry in the comparator stage provides proper output signals. The Schmitt detection circuit monitors the input preamplifier, and triggers when its output exceeds present levels. Preset levels are above worst case RMS noise level, with 1 x 10ox bit error rate, while low enough for enough sensitivity to allow operation over long links. This circuitry recognizes positive and negative going input signals. When the optical input goes from low to high, the electrical output changes to "1" (high). The output changes to "0" (low) when the optical input goes from high to low. Bandwidth has been limited to minimize noise problems. The output of the Schmitt Trigger detector stage is designed for good pulse width distortion (PWD).
Honeywell reserves the right to make changes in order to improve design and supply the best products possible.
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HFD3029
Schmitt Input, Non-Inverting TTL Output Receiver
ELECTRO-OPTICAL CHARACTERISTICS (-40C < TU < 85C, VUU = 5.00.5 VDC unless otherwise stated) PARAMETER Input Sensitivity [A] SYMBOL PUU (peak) VIY VIU t t IUU PWD 2.4 MIN TYP 1.0 MAX 1.5 UNITS W TEST CONDITIONS cI = 850 nm into 100/140 micron fiber cable, Duty cycle = 50%, square wave PUU -- 1.5 W, VUU = 5.0 VDC PUU - 0.1 W, VUU = 5.0 VDC II - 16 mA PUU -- 1.5W, VI = 0.4 to 2.4V PUU - 0.1W, VI = 2.4 to 0.4V VUU = 5 VDC f = 20 kHz, Duty Cycle = 50% PUU - 1.5 W PUU -- 100 W PUU --1.0W, Duty Cycle = 50%
High Level Logic Output Voltage Low Level Logic Output Voltage Rise Time Fall Time Supply Current Pulse Width Distortion [A]
3.3 0.3 12 3 6.0 5 5
0.4
V V ns ns mA %
12.0 10 10 200
Bandwidth Output Impedance
Notes 1. TU = +25C
BW I
20
kHz i
ABSOLUTE MAXIMUM RATINGS (25C Free-Air Temperature unless otherwise noted) Storage temperature Lead solder temperature Junction temperature Supply voltage -40 to +100C 260C, 10 s 150C +4.5 to +7 V
RECOMMENDED OPERATING CONDITIONS Operating temperature -40 to +100C (heat sinked) Supply voltage (heat sinked) Optical input power Optical signal pulse width +4.5 to +7 V 1.5 to 100 W > 4 s
Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
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Honeywell reserves the right to make changes in order to improve design and supply the best products possible.
HFD3029
Schmitt Input, Non-Inverting TTL Output Receiver
ORDER GUIDE Description Fiber optic Schmitt input, non-inverting TTL output receiver, plastic package Catalog Listing HFD3029-002 FIBER INTERFACE Honeywell detectors are designed to interface with multimode fibers with sizes (core/cladding diameters) ranging from 50/125 to 200/230 microns. Honeywell performs final tests using 100/140 micron core fiber. The fiber chosen by the end user will depend upon a number of application issues (distance, link budget, cable attenuation, splice attenuation, and safety margin). The 50/125 and 62.5/125 micron fibers have the advantages of high bandwidth and low cost, making them ideal for higher bandwidth installations. The use of 100/140 and 200/230 micron core fibers results in greater power being coupled by the transmitter, making it easier to splice or connect in bulkhead areas. Optical cables can be purchased from a number of sources.
This package is also available in special interface receptacles for interfacing to standard fiber optic cables.
CAUTION
The inherent design of this component causes it to be sensitive to electrostatic discharge (ESD). To prevent ESD-induced damage and/or degradation to equipment, take normal ESD precautions when handling this product.
BLOCK DIAGRAM
FIBER101.SCH
SWITCHING WAVEFORM
FIBER003.CIR
Fig. 1
Pulse Width Distortion vs Temperature
FIBER038.GRA
Fig. 2
Pulse Width Distortion vs Frequency
FIBER039.GR
Honeywell reserves the right to make changes in order to improve design and supply the best products possible.
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HFD3029
Schmitt Input, Non-Inverting TTL Output Receiver
Fig. 3 Pulse Width Distortion vs Optical Input Power
FIBER040.GRA
Fig. 4
Propagation Delay vs Optical Input Power
FIBER041.GR
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Honeywell reserves the right to make changes in order to improve design and supply the best products possible.

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