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參數(shù)資料
| 型號： | MAX3744 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | 2.7Gbps SFP Transimpedance Amplifiers with RSSI |
| 中文描述： | 2.7Gbps SFP互阻放大器，帶有RSSI |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 372K |
| 代理商： | MAX3744 |
M
2.7Gbps SFP Transimpedance
Amplifiers with RSSI
8
_______________________________________________________________________________________
The MAX3744 preamp measures the average photodi-
ode current and provides the information to the output
common mode. The MAX3748A RSSI detect block
senses the common-mode DC level of input signals IN+
and IN- and provides a ground-level-referenced output
signal of the photodiode current. The advantage of this
implementation is that it allows the TIA to be packaged
in a low-cost conventional 4-pin TO-46 header.
The MAX3748A RSSI output is connected to an analog
input channel of the DS1858/DS1859 SFP controller to
convert the analog information into a 16-bit word. The
DS1858/DS1859 provide the received power informa-
tion to the host board of the optical receiver through a
2-wire interface. The DS1859 allows for internal calibra-
tion of the receive power monitor.
The MAX3744 and the MAX3748A have been optimized
to achieve RSSI stability of better than 2.5dB within the
6μA to 500μA range of average input photodiode cur-
rent. To achieve the best accuracy, Maxim recom-
mends receive power calibration at the low end (6μA)
and the high end (500μA) of the required range.
Optical Power Relations
Many of the MAX3744/MAX3745 specifications relate to
the input signal amplitude. When working with optical
receivers, the input is sometimes expressed in terms of
average optical power and extinction ratio. Figure 6
and Table 1 show relations that are helpful for convert-
ing optical power to input signal when designing with
the MAX3744/MAX3745. (Refer to Application Note
HFAN
–
3.0.0:
Accurately Estimating Optical Receiver
Sensitivity
.)
Optical Sensitivity Calculation
The input-referred RMS noise current (I
N
) of the
MAX3744/MAX3745 generally determines the receiver
sensitivity. To obtain a system bit-error rate (BER) of
1E-12, the signal-to-noise ratio must always exceed
14.1. The input sensitivity, expressed in average power,
can be estimated as:
where
ρ
is the photodiode responsivity in A/W and I
N
is
RMS current in amps.
Input Optical Overload
The overload is the largest input that the MAX3744/
MAX3745 can accept while meeting deterministic jitter
specifications. The optical overload can be estimated
in terms of average power with the following equation:
Optical Linear Range
The MAX3744/MAX3745 have high gain, which limits
the output when the input signal exceeds 50μA
P-P
. The
MAX3744/MAX3745 operate in a linear range (10% lin-
earity) for inputs not exceeding:
Linear Range
A
2
r
r
dBm
RMS e
( )
ρ
log
( )
1
=
10
50
1
1000
μ
Overload
mA
2
r
dBm
RMS e
( )
ρ
log
+
1
=
10
1
2
1000
Sensitivity
I r
r
( )
ρ
dBm
( )
1
log
.
=
×
10
14 1
1
2
1000
PARAMETER
SYMBOL
P
AVG
r
e
P
1
P
0
P
IN
RELATION
Average power
Extinction ratio
Optical power of a 1
Optical power of a zero
Signal amplitude
Note:
Assuming 50% average duty cycle and mark density.
P
AVG
= (P
0
+ P
1
) / 2
r
e
= P
1
/ P
0
P
1
= 2P
AVG
(r
e
) / (r
e
+ 1)
P
0
= 2P
AVG
/ (r
e
+ 1)
P
IN
= P
1
- P
0
; P
IN
= 2P
AVG
(r
e
- 1) / (r
e
+ 1)
Table 1. Optical Power Relations
相關PDF資料 |
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|---|---|
| MAX3745 | 2.7Gbps SFP Transimpedance Amplifiers with RSSI |
| MAX3744D | Full-Duplex LVDM Transceiver 14-SOIC -40 to 85 |
| MAX3744E | Full-Duplex LVDM Transceiver 14-SOIC -40 to 85 |
| MAX3745D | Full-Duplex LVDM Transceiver 14-TSSOP -40 to 85 |
| MAX3745E | Full-Duplex LVDM Transceiver 14-TSSOP -40 to 85 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3744E/D-B2W WAF | 制造商:Maxim Integrated Products 功能描述: |
| MAX3745E/D | 制造商:Maxim Integrated Products 功能描述:2.7G SFP TRANSIMPEDANCE AMP W/RSSI |
| MAX3746ETE | 功能描述:限幅放大器 622Mbps to 3.2Gbps RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
| MAX3746ETE-T | 功能描述:限幅放大器 622Mbps to 3.2Gbps RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
| MAX3746EVKIT | 功能描述:限幅放大器 Evaluation Kit for the MAX3746 RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
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