hfd3023 5 mbit direct coupled receiver outline dimensions in inches (mm) description the hfd3023 is a sensitive direct coupled (dc) optical receiver designed for use in short distance, 850 nm fiber optic systems. the receiver contains a monolithic ic, consisting of a photodiode, dc amplifier, and open collector schottky output transistor. the output allows it to be directly interfaced with standard ttl circuits. the hfd3023 receiver is supplied in a honeywell plastic package, and can be mounted in several types of fiber optic connectors. application the hfd3023 fiber optic receiver converts the optical signal in a point to point data communications fiber optic link to a ttl output. its 0.006 in. photodiode with a 0.024 in. microlens (to enhance the optics) is mechanically centered within the to-18 package. electrical isolation is important in obtaining the maximum performance. a 0.1 f bypass capacitor must be connected between v and ground. this minimizes power supply noise, increasing the signal quality. shielding can also reduce coupled noise, through use of ground plane pcb, shielding around the device, and shielding around the leads. the hfd3023 is designed for a wide optical input range. the optical input dynamic range is guaranteed from the maximum sensitivity of 3.0 w to 100 w or greater than 15 db. features converts fiber optic input signals to ttl digital outputs typical sensitivity 2 w (-27 dbm) single 5 v supply requirement direct coupled receiver circuit open collector output plastic cap with to-18 header microlens optics for efficient fiber coupling designed to operate with honeywell 850 nm leds and integrated transmitters (12.7) .165 (4.19) .176 (4.47) .500 min .229 (5.82) crush ring window .047 (1.19) dia. .220 (5.59) .210 (5.33) .081 (2.06) 4 1 3 2 fiber203.dim fiber105.tif pinout 1. v 2. ground 3. output (ttl) 4. case (ground) honeywell reserves the right to make changes in order to improve design and supply the best products possible. h 271
hfd3023 5 mbit direct coupled receiver application ( continued ) optical power from the fiber strikes the photodiode and is converted to electrical current. this current couples to the dc amplifier, which drives an open collector transistor output. the output when connected to a pull up resistor can interface to ttl loads. the electrical signal is the inverse of the input light signal. when light strikes the photodiode, the output is a low logic level. when no light strikes the photodiode, the output is a high logic level. pulse width distortion (pwd) is an increase in the output pulse width (for high level optical input). the typical performance curves illustrate how pwd varies with optical power, temperature and frequency for the hfd3023. the amount of pwd that a given system can tolerate without an error due to a missing bit of information, is dependent upon system considerations. the output of the hfd3023 will typically connect to the input of some form of a serial interface adaptor ic. the specifications for that ic govern the amount of pwd that can be tolerated in the system. honeywell reserves the right to make changes in order to improve design and supply the best products possible. 272 h
hfd3023 5 mbit direct coupled receiver typ electro-optical characteristics (t = 25?c, v = 5 vdc unless otherwise stated) units test conditions min parameter symbol max ?? = 850 nm into 100/140 minimum in p ut sensitivit y p? o p tical fiber , f = 2.5 mhz , (p eak ) dut y c y cle = 50% , pwd <10% w 2.0 3.0 dbm -27.0 -25.2 p? C 0.1 w , r = 560 ? hi g h level lo g ic out p ut volta g e v?y v 2.4 4.5 p? 3 w , r = 560 ? low level lo g ic out p ut volta g e v? v 0.25 0.5 p? = 10 w , vt = 0.5 to 2.4v rise time t? ns 69 r = 560 p? = 10 w , vt = 2.4 to 0.5 v fall time t? ns 69 r = 560 su pp l y current i ma p? 3 w 13 15 p? C 0.1 w 4.5 6.5 f = 2.5mhz , dut y c y cle = 50% pulse width distortion pwd % p? = 3 w p eak 510 p? = 80 w p eak 25 35 absolute maximum ratings (25?c free-air temperature unless otherwise noted) -40 to +100?c storage temperature 260?c, 10 s lead solder temperature +6 v supply voltage 150?c junction temperature -40 to +100?c operating temperature 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. recommended operating conditions operating temperature -40 to +85?c supply voltage +4.5 to +5.5 vdc optical input power 3 to 100 w optical signal pulse width > 100 ns optical signal edges (10 to 90%) < 20 ns honeywell reserves the right to make changes in order to improve design and supply the best products possible. h 273
hfd3023 5 mbit direct coupled receiver description catalog listing order guide HFD3023-002 standard screening, plastic package this package is also available in special interface receptacles for interfacing to standard fiber optic cables. 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. c a u ti o n 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. block diagram fiber004.sc h switching waveform fiber004.ci r pulse width distortion vs optical input power fig. 1 fiber054.gra pulse width distortion vs temperature fig. 2 fiber055.g r honeywell reserves the right to make changes in order to improve design and supply the best products possible. 274 h
hfd3023 5 mbit direct coupled receiver pulse width distortion vs frequency fig. 3 fiber056.gra propagation delay time vs peak optical input power fig. 4 fiber057.g r honeywell reserves the right to make changes in order to improve design and supply the best products possible. h 275
|
