MAX3850EGJ Maxim Integrated Products, MAX3850EGJ Datasheet - Page 7

• Manufacturer Part Number: MAX3850EGJ
• Description: Laser Driver
• Manufacturer: Maxim Integrated Products

16, 18, 21
1, 4, 7
PIN
10
11
12
13
14
15
17
19
20
22
23
24
25
26
27
28
29
30
31
32
2
3
5
6
8
9
MODMON
BIASMON
BIASMAX
MODSET
APCFILT
ENABLE
APCSET
DATA+
LATCH
NAME
DATA-
_______________________________________________________________________________________
GND1
GND4
OUT+
GND4
GND3
CAPC
GND2
2.7Gbps, +3.3V DC-Coupled Laser Driver
CLK+
VCC2
OUT-
V
CLK-
V
V
BIAS
FAIL
N.C.
MD
CC1
CC4
CC3
Power Supply for Digital Circuits
Positive Data Input
Negative Data Input
Positive Clock Input. Connect to V
Negative Clock Input. Connect to V
TTL/CMOS Latch Input. High for latched data, low for direct data. Internal 100k pullup resistor
to V
TTL/CMOS Enable Input. High for normal operation, low to disable laser bias and modulation
current. Internal 100k
Ground for Digital Curcuits
Bias Current Monitor. Current into this pin is proportional to the laser bias current.
Modulation Current Monitor. Current into this pin is proportional to the laser modulation current.
TTL/CMOS Failure Output. Indicates APC failure when low.
Connect a capacitor (C
Ground for Output Curcuitry
Power Supply for Output Circuitry
Laser Bias Current Output
Positive Modulation Current Output. I
Negative Modulation Current Output. I
Ground for Modulation Current Source
Ground for APC Circuitry
Monitor Diode Input. Connect this pin to a monitor photodiode anode. A capacitor to ground is
required to filter high-speed AC monitor photocurrent.
Power Supply for APC
A capacitor connected from this pad to ground controls the dominant pole for the APC feedback
loop (C
Ground for Internal Reference
No Connection. Leave unconnected.
A resistor connected from this pad to ground sets the desired average optical power. Connect a
100k resistor from this pad to ground if APC is not used.
A resistor connected from this pad to ground sets the desired modulation current.
A resistor connected from this pad to ground sets the maximum bias current. The APC function
can subtract from this maximum value but cannot add to it.
Power Supply for Internal Reference
CC
.
APC
= 0.1µF).
APCFILT
pullup resistor to V
= 0.1µF) from this pad to ground to filter the APC noise.
CC
CC
MOD
or leave unconnected if latch function is not used.
MOD
or leave unconnected if latch function is not used.
flows into this pad when input data is high.
CC
FUNCTION
flows into this pad when input data is low.
.
Pin Description
7