125 Megabaud Versatile Link
The Versatile Fiber Optic
Connection
Technical Data
•Data Transmission at Signal Rates of 1 to 125 MBd over Distances of 100 Meters
•Compatible with Inexpensive, Easily Terminated Plastic Optical Fiber, and with Large Core Silica Fiber
•High Voltage Isolation
•Transmitter and Receiver Application Circuit Schematics and Recommended Board Layouts Available
•Interlocking Feature for Single Channel or Duplex Links, in a Vertical or Horizontal Mount Configuration
•Intra-System Links: Board- to-Board, Rack-to-Rack
•Telecommunications Switching Systems
•Computer-to-Peripheral Data Links, PC Bus Extension
•Industrial Control
•Proprietary LANs
•Digitized Video
•Medical Instruments
•Reduction of Lightning and Voltage Transient Susceptibility
The 125 MBd Versatile Link (HFBR-0507 Series) is the most cost-effective fiber-optic solution for transmission of 125 MBd data over 100 meters. The data link consists of a 650 nm LED transmitter, HFBR-15X7, and a PIN/preamp receiver, HFBR25X6. These can be used with low-cost plastic or silica fiber. One mm diameter plastic fiber provides the lowest cost solution for distances under 25 meters. The lower attenuation of silica fiber allows data transmission over longer distance, for a small difference in cost. These components can be used for high speed data links without the problems common with copper wire solutions, at a competitive cost.
The HFBR-15X7 transmitter is a high power 650 nm LED in a low cost plastic housing designed to efficiently couple power into 1 mm diameter plastic optical fiber
HFBR-0507 Series
HFBR-15X7 Transmitters
HFBR-25X6 Receivers
and 200 μm Hard Clad Silica (HCS®) fiber. With the recommended drive circuit, the LED operates at speeds from 1-125 MBd. The HFBR-25X6 is a high bandwidth analog receiver containing a PIN photodiode and internal transimpedance amplifier. With the recommended application circuit for 125 MBd operation, the performance of the complete data link is specified for of 0-25 meters with plastic fiber and 0-100 meters with 200 μm HCS® fiber. A wide variety of other digitizing circuits can be combined with the HFBR-0507 Series to optimize performance and cost at higher and lower data rates.
HCS® is a registered trademark of Spectran Corporation.
5965-6114E (1/97) |
17 |
125 MBd Data Link
Data link operating conditions and performance are specified for the HFBR-15X7 transmitter and HFBR-25X6 receiver in the
recommended applications circuits shown in Figure 1. This circuit has been optimized for 125 MBd operation. The Applications Engineering Department in the Hewlett-Packard Optical
Communication Division is available to assist in optimizing link performance for higher or lower speed operation.
Parameter |
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Symbol |
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Min. |
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Max. |
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Unit |
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Reference |
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Ambient Temperature |
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TA |
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0 |
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70 |
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°C |
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Supply Voltage |
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VCC |
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+4.75 |
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+5.25 |
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V |
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Data Input Voltage – Low |
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VIL |
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VCC -1.89 |
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VCC -1.62 |
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V |
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Data Input Voltage – High |
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VIH |
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VCC -1.06 |
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VCC -0.70 |
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V |
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Data Output Load |
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RL |
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45 |
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55 |
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Ω |
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Note 1 |
Signaling Rate |
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fS |
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1 |
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125 |
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MBd |
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Duty Cycle |
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D.C. |
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40 |
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60 |
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% |
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Note 2 |
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Link Performance: 1-125 MBd, BER ≤ 10-9, under recommended operating conditions with |
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recommended transmit and receive application circuits. |
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Min.[3] |
Typ.[4] |
Max. |
Unit |
Condition |
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Reference |
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Optical Power Budget, 1 m POF |
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OPBPOF |
11 |
16 |
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Note 5,6,7 |
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Optical Power Margin, |
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OPMPOF,20 |
3 |
6 |
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Note 5,6,7 |
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20 m Standard POF |
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Link Distance with |
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l |
20 |
27 |
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m |
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Standard 1 mm POF |
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Optical Power Margin, |
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OPMPOF,25 |
3 |
6 |
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Note 5,6,7 |
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25 m Low Loss POF |
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Link Distance with Extra |
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l |
25 |
32 |
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m |
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Low Loss 1 mm POF |
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Optical Power Budget, 1 m HCS |
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OPBHCS |
7 |
12 |
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Note 5,6,7 |
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Optical Power Margin, |
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OPMHCS,100 |
3 |
6 |
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Note 5,6,7 |
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100 m HCS |
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Link Distance with HCS Cable |
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l |
100 |
125 |
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m |
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Notes:
1.If the output of U4C in Figure 1, page 4 is transmitted via coaxial cable, terminate with a 50 Ω resistor to VCC - 2 V.
2.Run length limited code with maximum run length of 10 μs.
3.Minimum link performance is projected based on the worst case specifications of the HFBR-15X7 transmitter, HFBR-25X6 receiver, and POF cable, and the typical performance of other components (e.g. logic gates, transistors, resistors, capacitors, quantizer, HCS cable).
4.Typical performance is at 25°C, 125 MBd, and is measured with typical values of all circuit components.
5.Standard cable is HFBR-RXXYYY plastic optical fiber , with a maximum attenuation of 0.24 dB/m at 650 nm and NA = 0.5. Extra low loss cable is HFBR-EXXYYY plastic optical fiber, with a maximum attenuation of 0.19 dB/m at 650 nm and NA = 0.5. HCS cable is HFBR-H/VXXYYY glass optical fiber, with a maximum attenuation of 10 dB/km at 650 nm and NA = 0.37.
6.Optical Power Budget is the difference between the transmitter output power and the receiver sensitivity, measured after
1 meter of fiber. The minimum OPB is based on the limits of optical component performance over temperature, process, and recommended power supply variation.
7.The Optical Power Margin is the available OPB after including the effects of attenuation and modal dispersion for the minimum link distance: OPM = OPB - (attenuation power loss + modal dispersion power penalty). The minimum OPM is the margin available for longterm LED LOP degradation and additional fixed passive losses (such as in-line connectors) in addition to the minimum specified distance.
18
Performance of the HFBR-15X7 transmitter in the recommended application circuit (Figure 1) for POF; 1- 125 MBd, 25°C.
Parameter |
Symbol |
Typical |
Unit |
Condition |
Note |
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Average Optical Power 1 mm POF |
Pavg |
-9.7 |
dBm |
50% Duty |
Note 1, Fig 3 |
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Cycle |
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Average Modulated Power 1 mm POF |
Pmod |
-11.3 |
dBm |
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Note 2, Fig 3 |
Optical Rise Time (10% to 90%) |
tr |
2.1 |
ns |
5 MHz |
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Optical Fall Time (90% to 10%) |
tf |
2.8 |
ns |
5 MHz |
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High Level LED Current (On) |
IF,H |
19 |
mA |
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Note 3 |
Low Level LED Current (Off) |
IF,L |
3 |
mA |
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Note 3 |
Optical Overshoot - 1 mm POF |
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45 |
% |
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Transmitter Application Circuit |
ICC |
110 |
mA |
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Figure 1 |
Current Consumption - 1 mm POF |
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Hard Clad Silica Fiber (200 μm HCS) Transmitter Application Circuit: Performance of the HFBR-15X7 transmitter in the recommended application circuit (Figure 1) for HCS; 1-125 MBd, 25°C.
Parameter |
Symbol |
Typical |
Unit |
Condition |
Note |
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Average Optical Power 200 μm HCS |
Pavg |
-14.6 |
dBm |
50% Duty |
Note 1, Fig 3 |
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Cycle |
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Average Modulated Power 200 μm HCS |
Pmod |
-16.2 |
dBm |
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Note 2, Fig 3 |
Optical Rise Time (10% to 90%) |
tr |
3.1 |
ns |
5 MHz |
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Optical Fall Time (90% to 10%) |
tf |
3.4 |
ns |
5 MHz |
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High Level LED Current (On) |
IF,H |
60 |
mA |
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Note 3 |
Low Level LED Current (Off) |
IF,L |
6 |
mA |
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Note 3 |
Optical Overshoot - 200 μm HCS |
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30 |
% |
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Transmitter Application Circuit |
ICC |
130 |
mA |
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Figure 1 |
Current Consumption - 200 μm HCS |
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Notes:
1.Average optical power is measured with an average power meter at 50% duty cycle, after 1 meter of fiber.
2.To allow the LED to switch at high speeds, the recommended drive circuit modulates LED light output between two non-zero power levels. The modulated (useful) power is the difference between the high and low level of light output power (transmitted) or input power (received), which can be measured with an average power meter as a function of duty cycle (see Figure 3). Average Modulated Power is defined as one half the slope of the average power versus duty cycle:
[Pavg @ 80% duty cycle - Pavg @ 20% duty cycle] Average Modulated Power = ––——————————————————————
(2) [0.80 - 0.20]
3.High and low level LED currents refer to the current through the HFBR-15X7 LED. The low level LED “off” current, sometimes referred to as “hold-on” current, is prebias supplied to the LED during the off state to facilitate fast switching speeds.
19
Performance[4] of the HFBR-25X6 receiver in the recommended application circuit (Figure 1); 1-125 MBd, 25°C unless otherwise stated.
Parameter |
Symbol |
Typical |
Unit |
Condition |
Note |
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Data Output Voltage - Low |
VOL |
VCC -1.7 |
V |
RL = 50 Ω |
Note 5 |
Data Output Voltage - High |
VOH |
VCC -0.9 |
V |
RL = 50 Ω |
Note 5 |
Receiver Sensitivity to Average |
Pmin |
-27.5 |
dBm |
50% eye opening |
Note 2 |
Modulated Optical Power 1 mm POF |
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Receiver Sensitivity to Average |
Pmin |
-28.5 |
dBm |
50% eye opening |
Note 2 |
Modulated Optical Power 200 μm HCS |
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Receiver Overdrive Level of Average |
Pmax |
-7.5 |
dBm |
50% eye opening |
Note 2 |
Modulated Optical Power 1 mm POF |
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Receiver Overdrive Level of Average |
Pmax |
-10.5 |
dBm |
50% eye opening |
Note 2 |
Modulated Optical Power 200 μm HCS |
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Receiver Application Circuit Current |
ICC |
85 |
mA |
RL = ∞ |
Figure 1 |
Consumption |
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Notes:
4.Performance in response to a signal from the HFBR-15X7 transmitter driven with the recommended circuit at 1-125 MBd over 1 meter of HFBR-R/EXXYYY plastic optical fiber or 1 meter of HFBR-H/VXXYYY hard clad silica optical fiber.
5.Terminated through a 50 Ω resistor to VCC - 2 V.
6.If there is no input optical power to the receiver, electrical noise can result in false triggering of the receiver. In typical applications, data encoding and error detection prevent random triggering from being interpreted as valid data. Refer to Applications Note 1066 for design guidelines.
L1 |
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CB70-1812 |
VCC |
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C1 |
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C2 |
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14 |
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C3 |
C4 |
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C5 |
+ |
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C6 |
C7 |
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0.001 |
R5 |
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0.1 |
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0.1 |
0.001 |
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10 |
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0.1 |
0.001 |
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10 |
U1C |
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1 |
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7 74ACTQ00 |
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2 |
U2 |
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R8* |
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3 |
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Q1 |
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Q2 |
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4 |
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11 |
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5 HFBR-15X7 |
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BFQ52 |
BFQ52 |
1 |
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13 |
U1D |
Q3 |
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R9* |
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U1A |
3 |
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74ACTQ00 |
2N3904 |
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R6 |
R7 |
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74ACTQ00 |
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4 |
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91 |
91 |
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5 |
U1B |
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R10 |
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74ACTQ00 |
C8* |
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Q2 BASE |
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7 |
Q1 BASE |
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TX VCC |
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6 |
RX VCC |
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5 |
C20 |
C19 |
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ALL CAPACITOR VALUES |
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4 |
NC |
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0.1 |
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R12 |
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PIN 19 10H116 |
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ARE IN MICRO FARADS, |
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3 |
PIN 18 10H116 |
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VBB |
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VCC |
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C10 |
4.7 |
C9 |
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WITH 10% TOLERANCE |
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2 |
RX VEE |
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0.1 |
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J1 1 |
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3V |
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C17 |
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ALL RESISTANCES ARE IN |
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R22 |
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VBB |
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0.1 |
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OHMS WITH 5% TOLERANCE |
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R24 |
1K |
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R13 |
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(UNLESS OTHERWISE NOTED). |
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1K |
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R18 |
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R16 |
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4.7 |
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51 |
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51 |
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R14 |
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MC10H116FN |
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C16 |
MC10H116FN |
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MC10H116FN |
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1K |
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C12 |
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0.1 |
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0.1 |
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19 |
U4C |
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3 |
U4A |
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8 |
U4B |
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U3 |
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C15 |
R19 |
20 |
2 |
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R17 |
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R15 |
C11 |
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0.1 |
51 |
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51 |
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1K |
0.1 |
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5 |
HFBR-25X6 |
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R25 |
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R23 |
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3 V |
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1K |
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R20 |
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VCC |
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1K |
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THE VALUES OF R8, R9, R11, AND |
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VBB |
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12 |
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VBB |
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C8 ARE DIFFERENT FOR POF AND |
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HCS DRIVE CIRCUITS. |
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C18 |
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R21 |
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+ C14 |
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C13 |
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R8 |
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POF |
HCS |
TOLERANCE |
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10 |
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300 |
82 |
1% |
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0.1 |
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62 |
U5 |
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0.1 |
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R9 |
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300 |
82 |
1% |
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R11 |
1K |
470 |
1% |
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TL431 |
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C8 |
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43 pF |
120 pF |
1% |
Figure 1. Transmitter and Receiver Application Circuit with +5 V ECL Inputs and Outputs.
20