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參數(shù)資料
| 型號(hào)： | MAX3748ETE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | Dual Multiplexed LVDM Repeater 16-TSSOP -40 to 85 |
| 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(yè)數(shù)： | 7/11頁(yè) |
| 文件大?。?/td> | 414K |
| 代理商： | MAX3748ETE |
Offset Correction Loop
The MAX3748/MAX3748A is susceptible to DC offsets
in the signal path because it has high gain. In commu-
nication systems using NRZ data with a 50% duty
cycle, pulse-width distortion present in the signal or
generated in the transimpedance amplifier appears as
an input offset and is reduced by the offset correction
loop. For Gigabit Ethernet and Fibre Channel applica-
tions, no capacitor is required. For SONET applications,
C
AZ
= 0.1μF is recommended. This capacitor deter-
mines the lower 3dB frequency of the data path.
CML Output Buffer
The MAX3748/MAX3748A limiting amplifier
’
s CML out-
put provides high tolerance to impedance mismatches
and inductive connectors. The output current is approx-
imately 18mA. The output is disabled by connecting the
DISABLE pin to V
CC
. If the LOS pin is connected to the
DISABLE pin, the outputs OUT+ and OUT- are at a stat-
ic voltage (squelch) whenever the input signal level
drops below the LOS threshold. The output buffer can
be AC- or DC-coupled to the load (Figure 4).
Power-Detect and
Loss-of-Signal Indicator
The MAX3748/MAX3748A is equipped with an LOS cir-
cuitry, which indicates when the input signal is below a
programmable threshold, set by resistor R
TH
at the TH
pin (see
Typical Operating Characteristics
for appropri-
ate resistor sizing). An averaging peak-power detector
compares the input signal amplitude with this threshold
and feeds the signal detect information to the LOS out-
put, which is open collector. Two control voltages,
V
ASSERT
and V
DEASSERT
, define the LOS assert and
deassert levels. To prevent LOS chatter in the region of
the programmed threshold, approximately 2dB of hys-
teresis is built into the LOS assert/deassert function.
Once asserted, LOS is not deasserted until the input
amplitude rises to the required level (V
DEASSERT
)
(Figure 5).
Design Procedure
Program the LOS Assert Threshold
External resistor R
TH
programs the LOS threshold. See
the Assert/Deassert Levels vs. R
TH
graph in the
Typical
Operating Characteristics
to select the appropriate
resistor.
M
Compact 155Mbps to 3.2Gbps
Limiting Amplifier
_______________________________________________________________________________________________________
7
1dB
6dB
0V
SIGNAL ON
MAX DEASSERT LEVEL
MIN DEASSERT LEVEL
POWER-DETECT WINDOW
V
IN
TIME
SIGNAL OFF
Figure 2. LOS Deassert Threshold Set 1dB Below the Minimum
by Receiver Sensitivity (for Selected R
TH
)
50
50
75k
IN+
IN-
0.25pF
0.25pF
V
CC
ESD
STRUCTURES
Figure 3. CML Input Buffer
Q3
Q4
Q1
V
CC
50
50
Q2
18mA
18mA
DISABLE
DISABLE
DISABLE
DATA
OUT+
OUT-
ESD
STRUCTURES
Figure 4. CML Output Buffer
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX3748AETE | 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 |
| MAX3750 | Quad LVDM Transmitter 16-SOIC -40 to 85 |
| MAX3751CEE | +3.3V, 2.125Gbps/1.0625Gbps Fibre Channel Port Bypass ICs |
| MAX3750CEE | +3.3V, 2.125Gbps/1.0625Gbps Fibre Channel Port Bypass ICs |
| MAX3831 | +3.3V, 2.5Gbps, SDH/SONET, 4-Channel Interconnect Mux/Demux ICs with Clock Generator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3748ETE-T | 制造商:Maxim Integrated Products 功能描述:COMPACT 155MBPS TO 3.2GBPS LIMITING AMPLIFIER - Tape and Reel |
| MAX3748HETE | 制造商:Maxim Integrated Products 功能描述:#EMPTY - Rail/Tube |
| MAX3748HETE#G16 | 功能描述:限幅放大器 155-4.25Gbps SFP 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 |
| MAX3748HETE#TG16 | 功能描述:限幅放大器 155-4.25Gbps SFP 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 |
| MAX3748HETE+ | 功能描述:限幅放大器 155-4.25Gbps SFP 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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