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參數(shù)資料
| 型號： | MAX3800 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.2Gbps Adaptive Equalizer and Cable Driver |
| 中文描述： | 3.2Gbps自適應(yīng)均衡器及電纜驅(qū)動器 |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 349K |
| 代理商： | MAX3800 |
Detailed Description
The MAX3800 consists of a cable driver (transmitter)
and an adaptive cable equalizer (receiver). The driver
and equalizer are implemented on the same chip, but
they are completely independent.
The Cable Driver
The cable driver accepts differential or single-ended
current-mode logic (CML) input data at rates up to
3.2Gbps. The driver output is also implemented using
CML. The maximum output amplitude can be adjusted
over a typical range of 450mV to 870mV by changing
the value of the RMOD resistor between 10k
and
20k
(this resistor is connected between the RMOD pin
and ground).
The Adaptive Cable Equalizer
The adaptive cable equalizer accepts differential CML
input data at rates up to 3.2Gbps and is capable of
equalizing differential or single-ended signals. It auto-
matically adjusts to attenuation levels of up to 30dB at
1.6GHz (due to skin-effect losses in copper cable). The
equalizer consists of a CML input buffer, a loss-of-sig-
nal detector, a flat response amplifier, a skin-effect
compensation amplifier, a current-steering network, a
dual power-detector feedback loop, an output limiting
amplifier, and a CML output buffer (
Figure 1).
General Theory of Operation
The shape of the power spectrum of a random bit
stream can be described by the square of the sinc
function, where sinc f = (sin
π
f) /
π
f. For sufficiently long
bit patterns (nonrandom bit streams), sinc
2
(f) is a good
approximation. From the shape of the sinc
2
(f) function,
we can estimate the ratio of the power densities at any
two frequencies. The MAX3800 adaptive equalizer
employs this principle by incorporating a feedback loop
that continuously monitors the power at two frequencies
and dynamically adjusts the equalizer to maintain the
correct power ratio.
CML Input and Output Buffers
The input and output buffers are implemented using
current-mode logic (CML). Equivalent circuits are
shown in Figures 2 and 3. For details on interfacing with
M
3.2Gbps Adaptive Equalizer
and Cable Driver
6
_______________________________________________________________________________________
PIN
NAME
V
CCE
FUNCTION
1, 3, 6, 11, 14
Equalizer Power Supply
2, 7, 10, 15,
23, 24, 26, 31
GND
Ground
4
5
8
9
12
13
EIN+
EIN-
CIM-
CIM+
EOUT-
EOUT+
N.C.
LOS
Positive Equalizer Input, CML
Negative Equalizer Input, CML
Negative Cable Integrity Monitor (CIM) Output
Positive Cable Integrity Monitor (CIM) Output
Negative Equalizer Output, CML
Positive Equalizer Output, CML
No Connection. Leave unconnected.
Equalizer Loss-of-Signal Output, Active-Low
16, 17
18
19, 22, 27,
30, 32
V
CCD
Driver Power Supply
20
21
DIN+
DIN-
Positive Driver Input, CML
Negative Driver Input, CML
25
RMOD
Driver Output Modulation Adjust. A resistor connected from this pin to GND controls driver output
voltage.
28
29
DOUT+
DOUT-
Positive Driver Output, CML
Negative Driver Output, CML
EP
Exposed
Pad
Ground. The exposed pad must be soldered to the circuit board ground plane for proper thermal
and electrical performance.
Pin Description
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3800EVKIT | 功能描述:以太網(wǎng) IC Evaluation Kit for the MAX3800 RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| MAX3800EVKIT+ | 制造商:Maxim Integrated Products 功能描述:EVAL KIT FOR MAX3800 - Bulk |
| MAX3800UGJ | 功能描述:以太網(wǎng) IC RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| MAX3800UGJEVKIT | 功能描述:以太網(wǎng) IC 3.2Gbps Adaptive Equalizer and Cable Driver RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| MAX3800UGJ-T | 功能描述:以太網(wǎng) IC RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
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