HFD3880
Schmitt Input, Non-Inverting TTL Output Receiver
OUTLINE DIMENSIONS in inches (mm)DESCRIPTION
ST is a registered trademark of AT & T.
The HFD3880 is a sensitive schmitt triggered optical
receiver designed for use in short distance, 850 nm fiber
optic systems. The receiver uses a hybrid construction
consisting of a PIN photodiode and bipolar integrated
receiver circuit with internal voltage regulation. The TTL
non-inverting output allows it to be directly interfaced with
standard digital TTL circuits. Companion optical
transmitters are available for use with the HFD3880.
The HFD3880 optical receiver converts the optical signal
in a point to point data communications fiber optic link to
a TTL output. The HFD3880 consists of a base fiber optic
component (HFD3029) which is mounted in a fiber optic
connector that aligns the optical axis of the base
component to the axis of the optical fiber.
Electrical isolation is important in obtaining the maximum
performance of this highly sensitive receiver. Shielding
can reduce coupled noise and allow maximum sensitivity
to be obtained. Shielding 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 µF)
between VÙÙ (pin 1) and ground (pin 3) is recommended
for maximum power supply noise rejection.
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 distribution (PWD).
FEATURES
Converts fiber optic input signals to TTL totem pole
outputs
•
Maximum sensitivity 1.5 µW peak (-28.2 dBm)
•
Wide variety of cable options, operates with 50/125,
62.5/125, and 100/140 µm cables
•
Industry standard ST¨-LP fiber connector
•
Schmitt circuitry gives 17dB minimum dynamic
range and low Pulse Width Distortion
•
Operates up to 200K bps NRZ
•
Designed to operate with Honeywell 850 nm LEDs
•
Single 5 V supply requirement
•
Wave solderable
•
.805
.188
2-56THREADSTHRU
.375-32UNEF-2A
.325
.385
.210
.400
.375 .250
.105
PIN 1
PIN 3
.500
PIN 2
.375
FIBER103.DIM
FIBER209.TIF
Pinout
1. VÙÙ
2. Output (TTL)
3. Ground
Honeywell reserves the right to make
changes in order to improve design and
supply the best products possible.
416 h
HFD3880
Schmitt Input, Non-Inverting TTL Output Receiver
TYP
ELECTRO-OPTICAL CHARACTERISTICS(VÙÙ = 5.0 V ±0.5 VDC, -40¡C < TÙ < +85¡C unless otherwise stated)
UNITS TEST CONDITIONS
MINPARAMETER SYMBOL MAX
100
µ
m core fiberMinimum In
p
ut Sensitivit
y
PÛÜ
(
Peak
)
µ
W1 1.5
Dut
y
C
y
cle = 50%
,
850
µ
mT= 25¡C
PÛÜ — 1.5
µ
W
,
VÙÙ = 5.0 VDCHi
g
h Level Lo
g
ic Out
p
ut Volta
g
eVÏÝ V2.4 3.3
PÛÜ – 0.1
µ
W
,
VÙÙ = 5.0 VDCLow Level Lo
g
ic Out
p
ut Volta
g
eVÏÚ V0.3 0.4
IÏ – 16 mA
Power Su
pp
l
y
Current IÙÙ mA612
PÛÜ — 1.5
µ
W
,
VÏ = 0.4 to 2.4VRise Time tß ns12
PÛÜ – 0.1
µ
W
,
VÏ = 2.4 to 0.4VFall Time t¸ ns3
f = 20 kHz
,
Dut
y
C
y
cle = 50%Pulse Width Distortion PWD %
PÛÜ — 1.5
µ
W
p
eakT = 25¡C 5 10
PÛÜ — 100
µ
W510
PÛÜ — 1.0
µ
W
,
Bandwidth BW kHz
Dut
y
C
y
cle = 50%200
Out
p
ut Im
p
edance IÞ í20
ABSOLUTE MAXIMUM RATINGS
(Tcase = 25¡C unless otherwise noted)
-40 to +100¡CStorage temperature
+4.5 to +7.0 VSupply voltage
260¡C for 10 sLead solder temperature
150¡CJunction 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 +100¡C
Supply voltage +4.5 to +7.0 V
Optical input power 1.5 to 100 µW
Optical signal pulse width > 4 µs
Description Catalog Listing
ORDER GUIDE
HFD3880-002Fiber Optic Schmitt Input, Non
inverting, TTL Output Receiver
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.
Honeywell reserves the right to make
changes in order to improve design and
supply the best products possible. h417
HFD3880
Schmitt Input, Non-Inverting TTL Output Receiver
BLOCK DIAGRAM
FIBER101.SC
H
SWITCHING WAVEFORM
FIBER003.CI
R
Pulse Width Distortion vs Temperature
Fig. 1
FIBER038.GRA
Pulse Width Distortion vs Frequency
Fig. 2
FIBER039.G
R
Pulse Width Distortion vs Optical Input
Power
Fig. 3
FIBER040.GRA
Propagation Delay vs Optical Input Power
Fig. 4
FIBER041.G
R
Honeywell reserves the right to make
changes in order to improve design and
supply the best products possible.
418 h
