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參數(shù)資料
| 型號： | MAX3740ETG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | 3.2Gbps SFP VCSEL Driver with Diagnostic Monitors |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, QCC24 |
| 封裝： | 4 X 4 X 0.80 MM, QFN-24 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 818K |
| 代理商： | MAX3740ETG |
M
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
12
______________________________________________________________________________________
MAX3740
IN+
IN-
1nH
1nH
0.5pF
0.5pF
V
CC
50
50
16k
24k
V
CC
V
CC
PACKAGE
Figure 4. Simplified Input Structure
V
CC
MAX3740
PACKAGE
1nH
1nH
0.5pF
0.5pF
OUT-
OUT+
R
OUT+
R
OUT-
Figure 5. Simplified Output Structure
Programming Modulation Current
See the Modulation Current vs. R
MODSET
graph in the
Typical Operating Characteristics
, and select the value
of R
MODSET
that corresponds to the required current at
+25
°
C.
Programming Modulation-Current Tempco
Compute the required modulation tempco from the
slope efficiency of the laser at T
A
= +25
°
C and at a
higher temperature. Then select the value of R
TC
from
the
Typical Operating Characteristics
. For example,
suppose a laser has a slope efficiency (SE) of
0.021mW/mA at +25
°
C, which reduces to 0.018mW/mA
at +85
°
C. The temperature coefficient is given by the
following:
From the
Typical Operating Characteristics
, the value
of R
TC
, which offsets the tempco of the laser, is 9k
. If
modulation temperature compensation is not desired,
short TC1 and TC2.
Programming the APC Loop
Program the average optical power by adjusting
R
PWRSET
. To select the resistance, determine the
desired monitor current to be maintained over tempera-
ture and lifetime. See the Monitor Diode Current vs.
R
PWRSET
graph in the
Typical Operating Characteristics
section, and select the value of R
PWRSET
that corre-
sponds to the required current.
Input Termination Requirements
The MAX3740 data inputs are SFP MSA compatible. On-
chip 100
differential input impedance is provided for
optimal termination (Figure 4). Because of the on-chip
biasing network, the MAX3740 inputs self-bias to the
proper operating point to accommodate AC-coupling.
Laser tempco
SE
(
SE
85 25
SE
2380
E
ppm C
=
(
×
/
×
=
)
)
85
25
25
1 6
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3740ETG-T | 制造商:Maxim Integrated Products 功能描述:3.2GBPS SFP VCSEL DRIVER WITH DIAGNOSTIC MONI - Tape and Reel |
| MAX3741ETE | 功能描述:通信集成電路 - 若干 RoHS:否 制造商:Maxim Integrated 類型:Transport Devices 封裝 / 箱體:TECSBGA-256 數(shù)據(jù)速率:100 Mbps 電源電壓-最大:1.89 V, 3.465 V 電源電壓-最小:1.71 V, 3.135 V 電源電流:50 mA, 225 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| MAX3741ETE-T | 功能描述:通信集成電路 - 若干 RoHS:否 制造商:Maxim Integrated 類型:Transport Devices 封裝 / 箱體:TECSBGA-256 數(shù)據(jù)速率:100 Mbps 電源電壓-最大:1.89 V, 3.465 V 電源電壓-最小:1.71 V, 3.135 V 電源電流:50 mA, 225 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| MAX3741EVKIT | 功能描述:通信集成電路 - 若干 RoHS:否 制造商:Maxim Integrated 類型:Transport Devices 封裝 / 箱體:TECSBGA-256 數(shù)據(jù)速率:100 Mbps 電源電壓-最大:1.89 V, 3.465 V 電源電壓-最小:1.71 V, 3.135 V 電源電流:50 mA, 225 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| MAX3741HETE | 制造商:Maxim Integrated Products 功能描述:3.2GBPS COMPACT SFP VCSEL DRIVER - Rail/Tube |
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