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參數(shù)資料
| 型號： | MAX3735EGG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | 2.7Gbps, Low-Power SFP Laser Drivers |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, QCC24 |
| 封裝： | 4 X 4 MM, 0.90 MM HEIGHT, MO-220, QFN-24 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大小： | 1734K |
| 代理商： | MAX3735EGG |
M
2.7Gbps, Low-Power SFP Laser Drivers
10
______________________________________________________________________________________
Laser-Biasing and APC
To maintain constant average optical power, the
MAX3735/MAX3735A incorporate an APC loop to com-
pensate for the changes in laser threshold current over
temperature and lifetime. A back-facet photodiode
mounted in the laser package is used to convert the
optical power into a photocurrent. The APC loop
adjusts the laser bias current so that the monitor cur-
rent is matched to a reference current set by R
APCSET
.
The time constant of the APC loop is determined by an
external capacitor (C
APC
). For possible C
APC
values,
see the
Applications Information
section.
Safety Circuitry
The safety circuitry contains an input disable
(TX_DISABLE), a latched fault output (TX_FAULT), and
fault detectors (Figure 5). This circuitry monitors the
operation of the laser driver and forces a shutdown if a
fault is detected (Table 1). A single-point fault can be a
short to V
CC
or GND. See Table 2 to view the circuit
response to various single-point failures. The transmit
fault condition is latched until reset by a toggle of
TX_DISABLE or V
CC
. The laser driver offers redundant
laser diode shutdown through the optional shutdown
circuitry (see the
Typical Applications Circuit
). The
TX_FAULT pin should be pulled high with a 4.7k
to
10k
resistor to V
CC
as required by the SFP MSA.
Safety Circuitry Current Monitors
The MAX3735/MAX3735A feature monitors (BC_MON,
PC_MON) for bias current (I
BIAS
) and photo current
(I
MD
). The monitors are realized by mirroring a fraction
of the currents and developing voltages across external
resistors connected to ground. Voltages greater than
1.38V at PC_MON or BC_MON result in a fault state.
For example, connecting a 100
resistor to ground on
each monitor output gives the following relationships:
V
BC_MON
= (I
BIAS
/ 76) x 100
V
PC_MON
= I
MD
x 100
V
CC
V
CC
I
APCSET
C
APC
I
BIAS
I
MOD
R
D
I
MD
R
APCSET
x38
V
CC
R
PC_MON
PC_MON
100
IN-
IN+
I
ENABLE
I
ENABLE
INPUT BUFFER
SHUTDOWN
DATA
PATH
X270
SAFETY LOGIC
AND
POWER
DETECTOR
TX_FAULT
C
MD
TX_DISABLE
APCFILT1
APCFILT2
SHUTDOWN
MODSET
BC_MON
x1
76
I
BIAS
1
I
MD
APCSET
MD
MAX3735
MAX3735A
V
CC
V
BG
(4.7k
TO 10k
)
R
BC_MON
V
CC
V
BG
R
MODSET
V
CC
OUT-
OUT+
BIAS
V
CC
15
Figure 4. Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3735EGG-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX3735ETG | 制造商:Maxim Integrated Products 功能描述:2.7GBPS, LOW-POWER SFP LASER DRIVER - Rail/Tube |
| MAX3735ETG-T | 制造商:Maxim Integrated Products 功能描述:2.7GBPS, LOW-POWER SFP LASER DRIVER - Tape and Reel |
| MAX3736E/D | 功能描述:激光驅(qū)動器 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 |
| MAX3736ETE | 功能描述:激光驅(qū)動器 3.2Gbps 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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