5
Transmitter Notes:
1. Typical data are at T
A
= 25
°
C.
2. Thermal resistance is measured with the transmitter coupled to a connector assembly and mounted on a printed circuit board;
Θ
JC
<
Θ
JA
.
3. Optical power is measured with a large area detector at the end of 1 meter of mode stripped cable, with an ST* precision ceramic
ferrule (MIL-STD-83522/13), which approximates a standard test connector. Average power measurements are made at 12.5 MHz
with a 50% duty cycle drive current of 0 to I
F,peak
; I
F,average
= I
F,peak
/2. Peak optical power is 3 dB higher than average optical
power.
4. When changing from
μ
W to dBm, the optical power is referenced to 1 mW (1000
μ
W).
Optical power P(dBm) = 10*log[P(
μ
W)/1000
μ
W].
5. Fiber NA is measured at the end of 2 meters of mode stripped fiber using the far-field pattern. NA is defined as the sine of the half
angle, determined at 5% of the peak intensity point. When using other manufacturer’s fiber cable, results will vary due to differing
NA values and test methods.
6. Overshoot is measured as a percentage of the peak amplitude of the optical waveform to the 100% amplitude level. The 100%
amplitude level is determined at the end of a 40 ns pulse, 50% duty cycle. This will ensure that ringing and other noise sources have
been eliminated.
7. Optical rise and fall times are measured from 10% to 90% with 62.5/125
μ
m fiber. LED response time with recommended test
circuit (Figure 3) at 25 MHz, 50% duty cycle.
8. 2.0 mm from where leads enter case.
Figure 4. Normalized Transmitter Output Power vs.
Forward Current.
Figure 3. Typical Forward Voltage and Current
Characteristics.
Figure 5. Recommended Transmitter Drive and Test Circuit.
100
1.1
1.2
1.3
1.4
1.5
1.6
V
F
– FORWARD VOLTAGE – V
F
90
80
70
60
50
40
20
30
1.2
10
30
50
70
90
R
1.1
0.8
0.7
0.5
0.4
0.3
0.2
I
F
– FORWARD CURRENT – mA
0.9
1.0
0.6
DATA +
DATA –
10
9
13
12
8
14
15
6
7
4
2
5
3
16
0.1 μF
+ 5.0 V
75
75
220
1
2.7
24
NE46134
150
NE46134
2.7
220
0.1
μF
10 μF
TANTALUM
HFBR-1312T
2, 6
7
MC10H116A
NOTES:
1. ALL RESISTORS ARE 5% TOLERANCE.
2. BEST PERFORMANCE WITH SURFACE MOUNT COMPONENTS.
3. DIP MOTOROLA MC10H116 IS SHOWN, PLCC MAY ALSO BE USED.
11
V
bb
3
MC10H116B
MC10H116C