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參數(shù)資料
| 型號(hào)： | MAX3748AETE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | Circular Connector; No. of Contacts:53; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:23; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:23-53 RoHS Compliant: No |
| 中文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, QCC16 |
| 封裝： | 3 X 3 MM, 0.80 MM HEIGHT, MO-220WEED-2, TQFN-16 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 414K |
| 代理商： | MAX3748AETE |
M
Select the Coupling Capacitor
When AC-coupling is desired, coupling capacitors C
IN
and C
OUT
should be selected to minimize the receiver
’
s
deterministic jitter. Jitter is decreased as the input low-
frequency cutoff (f
IN
) is decreased:
f
IN
= 1 / [2
π
(50)(C
IN
)]
For ATM/SONET or other applications using scrambled
NRZ data, select (C
IN
, C
OUT
)
≥
0.1μF, which provides
f
IN
< 32kHz. For Fibre Channel, Gigabit Ethernet, or
other applications using 8B/10B data coding, select
(C
IN
, C
OUT
)
≥
0.01μF, which provides f
IN
< 320kHz.
Refer to Application Note HFAN-1.1:
Choosing AC-
Coupling Capacitors
.
Select the Offset-Correction Capacitor
The capacitor between CAZ1 and CAZ2 determines the
time constant of the signal path DC offset cancellation
loop. To maintain stability, it is important to keep a one-
decade separation between f
IN
and the low-frequency
cutoff (f
OC
) associated with the DC offset cancellation
circuit. For ATM/SONET or other applications using
scrambled NRZ data, f
IN
< 32kHz, so f
OCMAX
< 3.2kHz.
Therefore, C
AZ
= 0.1μF (f
OC
= 2kHz). For Fibre Channel
or Gigabit Ethernet applications, leave pins CAZ1 and
CAZ2 open.
RSSI Implementation
The SFF-8472 Digital Diagnostic specification requires
monitoring of input receive power. The MAX3748/
MAX3748A and MAX3744 receiver chipset allows for
the monitoring of the average receive power by mea-
suring the average DC current of the photodiode.
The MAX3744 preamp measures the average photodi-
ode current and provides the information to the output
common mode. The MAX3748/MAX3748A RSSI detect
block senses the common-mode DC level of input sig-
nals IN+ and IN- and provides a ground-referenced out-
put signal (RSSI) proportional to 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 MAX3748/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 receive-power
information to the host board of the optical receiver
through a 2-wire interface. The DS1859 allows for internal
calibration of the receive-power monitor.
The MAX3744 and the MAX3748/MAX3748A have been
optimized to achieve RSSI stability of 2.5dB within the
range of 6μA to 500μA of average input photodiode
current. 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; see
the RSSI Current Gain graph in the
Typical Operating
Characteristics
.
Connecting to the DS1858/DS1859
For best use of the RSSI monitor, capacitor C1 and
resistor R1 shown in the first
Typical Application Circuit
need to be placed as close as possible to the Dallas
diagnostic monitor with the ground of C1 and R1 the
same as the DS1858/DS1859 ground. Capacitor C1
suppresses system noise on the RSSI signal. R1 = 3k
and C1 = 0.1μF is recommended.
Compact 155Mbps to 3.2Gbps
Limiting Amplifier
8
_______________________________________________________________________________________
GND
ESD
STRUCTURE
V
CC
LOS
Figure 5. MAX3748 LOS Output Circuit
GND
ESD
STRUCTURE
V
CC
LOS
Figure 6. MAX3748A LOS Output Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3748AETE+T | 功能描述:限幅放大器 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 |
| MAX3748AETET | 制造商:MAXIM 功能描述:New |
| MAX3748AETE-T | 功能描述:限幅放大器 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 |
| MAX3748AEVKIT | 功能描述:限幅放大器 Evaluation Kit for the MAX3748A 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 |
| MAX3748BETE#G16 | 制造商:Maxim Integrated Products 功能描述: |
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