L8628 Datasheet, PDF (1/2 Pages) Hamamatsu Corporation – Transmitter/receiver photo IC for optical link

LED/PHOTO IC
Transmitter/receiver photo IC for optical link
L8628, S8627-01A
For MOST automotive network, 50 Mbps band POF communications
L8628 and S8627-01A are transmitter and receiver photo ICs developed for MOST (Media Oriented System Transport) networks used in vehicles to
communicate multimedia information. The transmitter photo IC L8628 consists of a red LED, driver IC and current regulator chip incorporated into a
clear plastic package and can be set to an operating mode that reduces the optical output level by half. The receiver photo IC S8627-01A is a
monolithic photo IC fabricated by the PiN-BiP process and features a wide dynamic range. It also has a low power consumption "sleeping mode" and
an optical wakeup mode triggered by input of light. Both the transmitter and receiver photo IC input and output digital signals through a TTL interface.
Features
Applications
L8628
l DC to 50 Mbps data communications
l TTL input
l Optical output 50 % cut mode
l Only for vehicle networks (MOST)
S8627-01A
l 4 M to 50 Mbps data communications
l Monolithic structure immune from external noise
l TTL output
l Wide dynamic range
l Sleeping mode with optical wakeup
s Absolute maximum ratings (Ta= 25 °C)
Parameter
Symbol
Supply voltage
Vcc
Operating temperature
Topr
Storage temperature
Tstg
Soldering
Tsol
Specifications of these products are subject to change
without prior notice to keep up with changes in the
MOST standard.
L8628, S8627-01A
Unit
-0.5 to +7.0
V
-40 to +95
°C
-40 to +110
°C
260 °C, 5 s, 3 times, at least 2.5 mm away from lead root
°C
S8627-01A
s Electrical and optical characteristics (Ta= -40 to +85 °C, Vcc=4.75 to 5.25 V)
P a ram ete r
Symbol
Condition
Min.
Typ.
Max.
Unit
Current consumption
(operation mode)
Icco *^1, *²
-
-
30
mA
Current consumption (sleeping mode)
Iccs Dark state
-
-
30
µA
Receiver level
Popt3 Bi-phase signal
-24
-
-3.5
dBm
High level output voltage
Voh Ioh= -150 µm
2.5
-
-
V
Vout
Low level output voltage
Rise time
Fall time
Vol Iol=1.6 mA
tr
tf
10 to 90 % *^1, *²
-
-
0.4
V
-
-
-
-
9
7
ns
Pulse width variation
tpwv
*^1, *^2, *^3, *⁵
18
-
29.8
ns
Pulse width distortion (average value)
tapwd *^1, *^2, *^3, *⁵
-1.8
-
+6.6
ns
Operation to sleeping mode transition receivable level
Psl
*^1, *^2, *⁴
Sleeping mode to operation transition receivable level Pop
-39
-
-25.5
dBm
Mode High level voltage
Vmh Ioh= -20 µA
4.0
-
-
V
out Low level voltage
Vml Iol=0.88 mA
-
-
0.5
V
*1: Measured with input signals conform ing to SP3 MOST specification of physical layer rev. 1.0.
*2: Measured with RL=50 kΩ, CL=15 pF (including parasitic capacitance such as probe, connector and evaluation circuit board
pattern), and threshold voltage=1.5 V.
*3: An optical input waveform is generated with a Ham am atsu standard transm itter.
*4: Average optical power is measured with a POF (NA=0.5).
*5: Measured with BiPhase PRBS at 45.2 Mbps (NRZ signal conversion).
Note) • If modulated light at 4 Mbps or less (including DC light and no light input) is input to S8627, the high and low levels cannot
be discerned.
• A bypass capacitor (0.1 µF) connected between Vcc and GND at a position within 3 mm from the lead, and
a 10 µF capacitor is also connected to the power supply line nearby.
• The optical axis of the package lens is exactly aligned with the center axis of the optical plug,
and the gap between the lens surface and the optical reference plane of the plug is 0.1 mm.
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