AFBR-1012 Transmitter and AFBR-2012 Receiver are de-
signed to transmit/ receive up to 25MBit/s optical data
which are biphase coded (up to 50Mbaud). Both are
packaged in 4-pin transfer molded, low-cost packages
ready for assembly into MOST® plastic fiber optic connec-
tor receptacles.
The transmitter utilizes a 650 nm LED source with inte-
grated optics for efficient coupling into 1mm Polymer Op-
tical Fiber (POF), and the receiver contains a high speed
PIN diode to receive this light.
Input/output data has TTL switching levels, compatible
with MOST® Network Interface Controller ICs.
These optical components are specified for operation
over a -40°C to +95°C temperature range, and meet the
reliability requirements of automotive applications. In the
absence of data activity, the receiver switches to very low
power mode. While in this mode, the PIN diode can sense
new data activity and switch the receiver back to full op-
eration.
Features
Operating @ 3.3V or 5V (+/-5% each) Power supply
Operating temperature range -40°C to +95°C
TTL Data Input/ Output (Logic to Light Function)
Power down mode
During the low power mode a receiver STATUS-pin
indicates if modulated light is received (Light on ->
STATUS = low). The power supply of the whole MOST
device can be switched on with this Status-pin.
Duty Cycle Adjust (DCA), yields to enhanced SP1 input
range
650nm for working in a low attenuation range of PMMA
Fiber
-25dBm guaranteed sensitivity @ 650nm
Fully compliant to “MOST® Specification of Physical
Layer Rev 1.1”
RoHS compliant (Lead free and halogen free)
Lead is flash gold
Low power consumption
Photo current sensing, network activity detection and
Low Power Mode (I
CC
< 10μA)
Additional Low Power Mode (I
CC
< 15μA) for the
transmitter when SP1 input is low
Signal detect and Status Output
Pulse width control
Applications
Optical Transmitter and Receiver for MOST® 50 Mbaud
systems (a full description of the MOST® 50 Mbaud
system is available at www.mostcooperation.com)
Absolute maximum ratings
Parameter
Supply Voltage
[1]
Storage Temperature
Soldering Temperature
(distance to package >3mm; t≤10s)
[2]
Voltage at any PIN
Electrostatic Voltage Capability
[3]
ESD
Symbol
V
CCMax
T
STG
T
S
Min.
-0.5
-40
Max.
6.0
110
260
Units
V
°C
°C
V
kV
-0.5
VCC+0.5
2.0
Notes:
1. Maximum supply voltage without causing damage
2. For more information regarding the solder process see Application Note 5420 (Handling, Storage, Operating and Processing)
3. ESD Capability for all Pins HBM (human body model) according JESD22-A114B
Recommended operating conditions
Parameter
Supply Voltage low
Supply Voltage high
Operating temperature (ambient)
[1]
Symbol
V
CC_l
V
CC_hl
T
A
Min.
3.135
4.75
-40
Max.
3.465
5.25
95
Units
V
V
°C
Notes:
1. For more information see Application Note 5420 (Handling, Storage, Operating and Processing)
All the data in this specification refers to the operating conditions above and over lifetime unless otherwise stated.
Part Number Options
Part Number
AFBR-1012S/AFBR-2012S
AFBR-1012L/AFBR-2012L
AFBR-1012M/AFBR-2012M
Part Description
Transmitter/Receiver – Short Leads
Transmitter/Receiver – Long Leads
Transmitter/Receiver - Medium Leads
Solder Heat Resistance
Lead dip in liquid solder of 260°C for 10 Sec.
acc. JEDEC standard JESD22-B106-C
(for more information see Application Note 5420)
2
AFBR-1012 (Transmitter)
DC Characteristics
Parameter
Low Level Input voltage
High Level Input Voltage
Input Leakage Current
(VCC = 5.0V; VI = 0V or VI =5.0V)
Input Capacitance
Input Resistance
Supply Current Full Power Mode
[1]
Supply Current Low Power Mode
[2]
Symbol
V
IL
V
IH
I
L
C
I
R
I
I
CC
I
LP2
Min.
-0.3
2.0
Typ.
Max.
0.8
VCC+0.3
+/-20
7
Units
V
V
μA
pF
kΩ
mA
μA
2
25
15
Notes:
1. The current through the LED and therefore the optical output power and overall power consumption depends on the settings of R
EXT
.
The nominal value for R
EXT
is 15k. With R
EXT
= 30k the optical output power is about -3dB of the nominal value.
Important: The external resistor of R
EXT
must be within the range of 13.5kΩ to 33kΩ. For values out of this range functionality may not be given over the
whole temperature range and the device lifetime.
2. If the transmitter is in full power mode it is switched OFF 1ms (max) after Tx DATA is low. If the transmitter is in low power mode it is switched ON
6ms (max) after Tx Data transmission starts.
AC Electrical Characteristics
Parameter
Power Up Time
Data Power Down Time
Symbol
T
PU
T
PD
Min.
Typ.
0.016
0.01
Max.
6
1.0
Units
ms
ms
Optical Signal Characteristics 45.158Mbaud (44.1kHz)
(22.5 MBit/s MOST Data, V
CC
= 3.135 … 3.465V or 4.75 … 5.25V, R
EXT
= 15kOhm)
Parameter
Peak wavelength
Temperature coefficient λPEAK
Spectral Bandwidth (FWHM)
Average Output Power coupled into plastic fiber
[1]
Average Output Power coupled into plastic fiber
(if R
EXT
= 13.5k is used instead of R
EXT
=15k)
[1]
Optical Output Power “Light off ”
[2]
Optical Rise Time (20% - 80%)
[4]
Optical Fall Time (80% - 20%)
[4]
Extinction Ratio
[4,6]
Pulse Width Variation
[3,4,5]
Average Pulse Width Distortion
[3,4]
Data Dependent Link Jitter
[3,4]
Uncorrelated Link Jitter
[3,4]
Positive Overshoot within 0UI … 2/3UI
[4,6]
Negative Overshoot within -1UI … -1/4UI
[4,6]
High Level Signal Ripple between 2/3UI and 3/4UI
Symbol
λ
Peak
TC
λ
Delta
λ
P
opt
P
opt
P
OFF
t
r
t
f
r
e
t
PWV
t
APWD
t
DDJ
t
UJ
Min.
630
Typ.
650
0.16
20
Max.
685
30
-2.0
-1.5
-50
Units
nm
nm/K
nm
dBm
dBm
dBm
ns
ns
dB
ns
ns
ns
ns
%
%
%
-8.0
-7.5
-5.2
-4.7
2.5
3.5
10
20.0
-1.4
0.2
0.05
-20
-10
-10
15
5.98
5.98
24.29
1.4
0.77
0.33
40
20
10
Notes:
1. Average value when transmitting modulated light @signal timing parameters. The output power coupled into plastic fiber Popt is measured with
a large area detector at the end of 30cm POF fiber with a NA = 0.5 which is ideally coupled to the transmitter
2. Average value when signal on Tx_Data is low
3. The electrical input signal has to fulfill the following requirements: t
pwv(min)
= 20.1ns, t
pwv(max)
= 24.1ns, t
tAPWD(min)
= -1.5ns and t
tAPWD(max)
=
1.5ns, t
DDJ(max)
= 0.22ns, t
UJ(max)
= 0.10ns
4. Characterized with Avago Characterization Boards
5. Limits for 2UI are 42.2 … 46.4ns and for 3UI they are 64.3 … 68.5ns.
6. Top and Base level measured at least over 10UIs.
3
Optical Signal Characteristics 49.152Mbaud (48kHz)
(24.576 MBit/s MOST Data, V
CC
= 3.135 … 3.465V or 4.75 … 5.25V, R
EXT
= 15k)
Parameter
Peak wavelength
Temperature coefficient λPEAK
Spectral Bandwidth (FWHM)
Average Output Power coupled into plastic fiber
[1]
Average Output Power coupled into plastic fiber
(if R
EXT
= 13.5k is used instead of R
EXT
=15k)
[1]
Optical Output Power “Light off ”
[2]
Optical Rise Time (20% - 80%)
[4]
Optical Fall Time (80% - 20%)
[4]
Extinction Ratio
[4,6]
Pulse Width Variation
[3,4,5]
Average Pulse Width Distortion
[3,4]
Data Dependent Link Jitter
[3,4]
Uncorrelated Link Jitter
[3,4]
Positive Overshoot within 0UI … 2/3UI
[4,6]
Negative Overshoot within -1UI … -1/4UI
[4,6]
High Level Signal Ripple between 2/3UI and 3/4UI
Symbol
λ
Peak
TC
λ
Delta
λ
P
opt
P
opt
P
OFF
t
r
t
f
r
e
t
PWV
t
APWD
t
DDJ
t
UJ
Min.
630
Typ.
650
0.16
20
Max.
685
30
-2.0
-1.5
-50
Units
nm
nm/K
nm
dBm
dBm
dBm
ns
ns
dB
ns
ns
ns
ns
%
%
%
-8.0
-7.5
-5.2
-4.7
2.5
3.5
10
18.4
-1.28
0.2
0.05
-20
-10
-10
15
5.49
5.49
22.3
1.28
0.71
0.31
40
20
10
Notes:
1. Average value when transmitting modulated light @signal timing parameters. The output power coupled into plastic fiber Popt is measured with
a large area detector at the end of 30cm POF fiber with a NA = 0.5 which is ideally coupled to the transmitter
2. Average value when signal on Tx_Data is low
3. The electrical input signal has to fulfill the following requirements: t
pwv(min)
= 18.4ns, t
pwv(max)
= 22.3ns, t
tAPWD(min)
= -1.28ns and t
tAPWD(max)
=
1.28ns, t
DDJ(max)
= 0.2ns, t
UJ(max)
= 0.09ns
4. Characterized with Avago Characterization Boards
5. Limits for 2UI are 38.72 … 42.66ns and for 3UI they are 59.06 … 63.01ns.
6. Top and Base level measured at least over 10UIs.
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