MAX3901 Maxim, MAX3901 Datasheet - Page 9

• Manufacturer Part Number: MAX3901
• Description: 150Mbps Automotive Fiber Optic Receivers
• Manufacturer: Maxim

Figure 3. MAX3902 CML Output
Figure 4. STATUS Monitor Output
Figure 5. FILT pad
R
OUT
150Mbps Automotive Fiber Optic Receiver
V
MAX3901
MAX3902
CC
R
_______________________________________________________________________________________
STATUS
16kΩ
MAX3901
MAX3902
R
OUT
V
100kΩ
CC
35pF
V
CC
MAX3902
V
CC
V
FILT
CC
STATUS
OUT+
OUT-
The coupling capacitor should be 0.1µF or larger. Refer
to Application Note HFAN-1.1: Choosing AC-Coupling
Capacitors for a more detailed discussion.
The MAX3901/MAX3902 include a status monitor
(Figure 4). The average current at the FILT (Figure 5)
pad determines whether the MAX3901/MAX3902 are in
operating or standby mode. STATUS is TTL low when
the receiver is in operating mode. STATUS is TTL high
when the receiver is in standby mode.
Many of the MAX3901/MAX3902 specifications relate to
the input signal amplitude. Figure 6 and Table 1 show
relations that are helpful for converting optical power to
input signal when designing with the MAX3901/
MAX3902.
For high-current density and reliable operation, the
MAX3901 and MAX3902 use gold metalization. For
best results, use gold-wire ball-bonding techniques.
Use caution if attempting wedge bonding. Bond-pad
size is 94.4µm x 94.4µm, and bond-pad metal thick-
ness is 1.2µm. Refer to Maxim Application Note, HFAN-
08.0.1: Understanding Bonding Coordinates and
Physical Die Size for additional information.
Table 1. Optical Power Relations*
*Assuming a 50% average mark density.
Average Power
Extinction Ratio
Optical Power
of a “1”
Optical Power
of a “0”
Optical Modulation
Amplitude
PARAMETER
Applications Information
SYMBOL
P
OMA
P1
P0
AVE
E
Optical Power Relations
r
P
E
P0 = 2P
OMA P
2
2
P
P
P
1 2
AVE
r
AVE
AVE
= P1 / P0
=
Wire Bonding
P
= (P0 + P1) / 2
=
AVE
+
−
Status Monitor
AVE
OMA
OMA
1
RELATION
−
E
P
E
r
/ E
0 2
+
r
=
1
r
+ 1
P
AVE
E
E
r
r
+
-
1
1
9