MAX3735AETG+ Maxim Integrated Products, MAX3735AETG+ Datasheet - Page 12

• Manufacturer Part Number: MAX3735AETG+
• Description: IC LSR DRVR 2.7GBPS 3.63V 24TQFN
• Manufacturer: Maxim Integrated Products
• Type: Laser Diode Driver (Fiber Optic)r

Specifications of MAX3735AETG+

• Data Rate: 2.7Gbps
• Number Of Channels: 1
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 27mA
• Current - Modulation: 85mA
• Current - Bias: 100mA
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 24-TQFN Exposed Pad
• Mounting Type: Surface Mount
• Operating Supply Voltage: 3.3 V
• Supply Current: 27 mA
• Maximum Operating Temperature: + 85 C
• Maximum Power Dissipation: 1354 mW
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.7Gbps, Low-Power SFP Laser Drivers
Table 2. Circuit Responses to Various Single-Point Faults
*A fault state asserts the TX_FAULT pin, disables the modulation and bias currents, and asserts the SHUTDOWN pin.
Table 3. Optical Power Definitions
12
Average Power
Extinction Ratio
Optical Power High
Optical Power Low
Optical Amplitude
Laser Slope
Efficiency
Modulation Current
TX_DISABLE
SHUTDOWN
PARAMETER
PIN NAME
TX_FAULT
APCFILT1
APCFILT2
PC_MON
BC_MON
MODSET
APCSET
______________________________________________________________________________________
OUT+
OUT-
BIAS
IN+
MD
IN-
Does not affect laser power.
Modulation and bias currents are disabled.
The optical average power increases and a fault occurs
if V
responds by decreasing the bias current.
The optical average power decreases and the APC
loop responds by increasing the bias current. A fault
state occurs if V
Disables bias current. A fault state occurs.
Does not affect laser power. If the shutdown circuitry is
used, laser current is disabled and a fault state* occurs.
In this condition, laser forward voltage is 0V and no light
is emitted.
The APC circuit responds by increasing the bias current
until a fault is detected, then a fault state* occurs.
Does not affect laser power.
Fault state* occurs.
Fault state* occurs.
IBIAS increases until V
voltage.
IBIAS increases until V
voltage.
Does not affect laser power.
Does not affect laser power.
PC_MON
SYMBOL
CIRCUIT RESPONSE TO OVERVOLTAGE
P
I
P
MOD
AVG
P
P
r
P-P
e
1
0
exceeds the threshold. The APC loop
BC_MON
OR SHORT TO V
P
r
P
P
P
I
MOD
e
AVG
1
0
P-P
= P
= P
= 2P
= 2P
BC_MON
BC_MON
= P
P-P
= P
= (P
1
exceeds the threshold voltage.
RELATION
/ P
AVG
AVG
1
/ I
P-P
- P
0
0
MOD
+ P
x r
/ (r
/
0
exceeds the threshold
exceeds the threshold
e
e
1
) / 2
/ (r
+ 1)
CC
e
+ 1)
To minimize the pattern-dependent jitter associated
with the APC loop time constant, and to guarantee loop
stability, connect a capacitor between APCFILT1 and
APCFILT2 (see the Applications Information section for
more information about choosing C
capacitor attached to the photodiode anode (C
also recommended to filter transient currents that origi-
nate from the photodiode. To maintain stability and
proper phase margin associated with the two poles
created by C
greater than C
to 20x greater than C
Does not affect laser power.
Normal condition for circuit operation.
The optical average power decreases and the APC
loop responds by increasing the bias current. A fault
state occurs if V
The optical average power increases and a fault occurs
if V
responds by decreasing the bias current.
The APC circuit responds by increasing bias current
until a fault is detected, then a fault state* occurs.
Does not affect laser power.
Fault state* occurs. If the shutdown circuitry is used, the
laser current is disabled.
Fault state* occurs. If the shutdown circuitry is used,
laser current is disabled.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
IBIAS increases until V
voltage.
IBIAS increases until V
voltage.
Fault state* occurs.
Fault state* occurs.
PC_MON
CIRCUIT RESPONSE TO UNDERVOLTAGE
MD
APC
exceeds the threshold. The APC loop
for the MAX3735. C
OR SHORT TO GROUND
BC_MON
and C
MD
Pattern-Dependent Jitter
for the MAX3735A.
BC_MON
BC_MON
MD
exceeds the threshold voltage.
, C
exceeds the threshold
exceeds the threshold
APC
APC
APC
should be 20x
should be 4x
values). A
MD
) is