參數(shù)資料
型號(hào)： MAX3735A
廠商： Maxim Integrated Products, Inc.
英文描述： 2.7Gbps. Low-Power SFP Laser Drivers
中文描述： 2.7Gbps、低功耗、SFP激光驅(qū)動(dòng)器
文件頁(yè)數(shù)： 9/18頁(yè)
文件大?。?/td> 1734K
代理商： MAX3735A
M
2.7Gbps, Low-Power SFP Laser Drivers
_______________________________________________________________________________________
9
Detailed Description
The MAX3735/MAX3735A laser drivers consist of three
parts: a high-speed modulation driver, a laser-biasing
block with automatic power control (APC), and safety
circuitry (Figure 4). The circuit design is optimized for
high-speed and low-voltage (+3.3V) operation.
High-Speed Modulation Driver
The output stage are composed of a high-speed differ-
ential pair and a programmable modulation current
source. The MAX3735/MAX3735A are optimized for dri-
ving a 15
load; the minimum instantaneous voltage
required at OUT+ is 0.6V. Modulation current swings up
to 60mA are possible when the laser diode is DC-cou-
pled to the driver and up to 85mA when the laser diode
is AC-coupled to the driver.
To interface with the laser diode, a damping resistor
(R
D
) is required for impedance matching. The com-
bined resistance of the series damping resistor and the
equivalent series resistance of the laser diode should
equal 15
. To reduce optical output aberrations and
duty-cycle distortion caused by laser diode parasitic
inductance, an RC shunt network might be necessary.
Refer to Maxim Application Note HFAN 02.0:
Interfacing
Maxim’s Laser Drivers to Laser Diodes
for more informa-
tion.
At data rates of 2.7Gbps, any capacitive load at the
cathode of a laser diode degrades optical output perfor-
mance. Because the BIAS output is directly connected
to the laser cathode, minimize the parasitic capacitance
associated with the pin by using an inductor to isolate
the BIAS pin parasitics from the laser cathode.
Pin Description
PIN
NAME
V
CC
IN+
IN-
FUNCTION
1, 4, 8, 14, 18
2
3
+3.3V Supply Voltage
Noninverted Data Input
Inverted Data Input
5
PC_MON
Photodiode Current Monitor Output. Current out of this pin develops a ground-referenced voltage
across an external resistor that is proportional to the monitor diode current.
6
BC_MON
Bias Current Monitor Output. Current out of this pin develops a ground-referenced voltage across an
external resistor that is proportional to the bias current.
7, 12, 22
GND
Ground
9
SHUTDOWN
Shutdown Driver Output. Voltage output to control an external transistor for optional shutdown
circuitry.
10
11
13
TX_FAULT
MODSET
BIAS
Open-Collector Transmit Fault Indicator (Table 1).
A resistor connected from this pad to ground sets the desired modulation current.
Laser Bias Current Output
15, 16
OUT+
Noninverted Modulation Current Output. Connect pins 15 and 16 externally to minimize parasitic
inductance of the package. I
MOD
flows into this pin when input data is high.
Inverted Modulation Current Output. I
MOD
flows into this pin when input data is low.
Monitor Diode Input. Connect this pin to the anode of a monitor photodiode. A capacitor to ground is
required to filter the high-speed AC monitor photocurrent.
17
OUT-
19
MD
20
APCFILT1
Connect a capacitor (C
APC
) between pin 20 (APCFILT1) and pin 21 (APCFILT2) to set the dominant
pole of the APC feedback loop.
21
23
APCFILT2
APCSET
See APCFILT1
A resistor connected from this pin to ground sets the desired average optical power.
24
TX_DISABLE
Transmitter Disable, TTL. Laser output is disabled when TX_DISABLE is asserted high or left
unconnected. The laser output is enabled when this pin is asserted low.
EP
Exposed
Pad
Ground. Must be soldered to the circuit board ground for proper thermal and electrical performance
(see the
Exposed Pad Package
section).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3735AE/D 功能描述:激光驅(qū)動(dòng)器 RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube
MAX3735AE/D DIE 制造商:Maxim Integrated Products 功能描述:
MAX3735AEGG 功能描述:激光驅(qū)動(dòng)器 RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube
MAX3735AEGG-T 功能描述:激光驅(qū)動(dòng)器 RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube
MAX3735AETG 功能描述:激光驅(qū)動(dòng)器 2.7Gbps Low-Power SFP Laser Driver RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube
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