AFBR-26x4Z/25x9Z Receiver
The AFBR-26x4Z/25x9Z receiver consists of a digitalizing IC with integrated photodiode to produce an output level that
is compatible with TTL logic. The integrated photodiode and the following ampli er uses a fully di erential approach
with an active and a passive area for an improved EMI performance. Within the speci ed ranges AFBR-25x9Z and AFBR-
26x4Z devices will support a BER <10E-9.
Receiver Electrical Characteristics
(T
A
= -40 °C to +85 °C, V
CCT
= 3.3 V ± 5% or 5 V ± 5%)
Parameter Symbol Min Typical Max Unit Notes
Supply Current I
CCR
20 30 mA
Data Output Voltage – Low V
OL
-0.3 0.4 V 1, 3
Data Output Voltage – High V
OH
2.5 V
CCR
+0.3 V 1, 3
Rise Time (10%–90%) t
RR
5 ns 2, 3
Fall Time (10%–90%) t
FR
5 ns 2, 3
Pulse Width Distortion PWD -4 +4 ns 3, 6, 7, 8, 11
Pulse Width Distortion 1
st
to 3
rd
pulse PWD
init
-5 +8 ns 3, 8, 9, 11
Propagation Delay t
RD
30 ns
Max. Initiation time after Power up T
INT
15 ms 12
Receiver Optical Characteristics
(T
A
= -40 °C to +85 °C, V
CCT
= 3.3 V ± 5% or 5 V ± 5%)
Parameter Symbol Min Typical Max Unit Notes
Input Optical Power (Peak), 1 mm POF P
IN
-22 +2 dBm 3
Input Optical Power (Peak) O -State, 1 mm POF P
IN
_O -40 dBm 3, 10
Input Optical Power (Peak), PCS (200 m) P
IN
-25 -1 dBm 3
Input Optical Power (Peak) O -State, PCS (200 m) P
IN
_O -44 dBm 3
Optical Spectrum Range
630 685 nm
Notes:
1. Standard TTL output.
2. Measured with R
L
= 50 k and C
L
= 15 pF
3. Guaranteed only if optical input signal to the receiver is generated by AFBR-16xxZ, with ideal alignment to photo diode using 1mm POF (NA=0.5).
6. Optical input signal of 50 MBd, PRBS 2
7
-1 pattern and 50% duty cycle.
7. Pulse width is measured at 50% threshold using a rising edge trigger and PRBS 2
7
-1 pattern.
8. If data rate is below 1MBd the pulse width distortion would be equal to the pulse width distortion of the 1st to 3rd pulses for higher datarates.
9. The threshold of the 1st pulse of a data sequence is di cult to adjust and therefore the pulse width distortion up to the 3rd pulse is higher than
for all other pulses (worst case for the 1st pulse). This strongly depends on the quality of the rising and falling edge of the optical input. The faster
the edges the smaller the pulse width variation. Furthermore lower data rates would result in the same issue as all the pulse become 1st pulses.
10. Output low for AFBR-26x4Z and Output high for AFBR-25x9Z.
11. Because of optical pulse width spreading, the PWD limits have to be increased by 0.1 ns for each 10 m ber length.
12. Starting point is when supply voltage passes ~2.8 V.
