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參數(shù)資料
| 型號(hào)： | MAX3980UTH+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC XAUI QUAD EQUAL 44-TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 43 |
| 系列： | * |
| 應(yīng)用： | * |
| 接口： | * |
| 電源電壓： | * |
| 封裝/外殼： | 44-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 44-TQFN-EP（7x7） |
| 包裝： | 管件 |
| 安裝類型： | 表面貼裝 |
MAX3980
Detailed Description
Receiver and Transmitter
The receiver accepts four lanes of 3.125Gbps current-
mode logic (CML) digital data signals. The adaptive
equalizer compensates each received signal for dielec-
tric and skin losses. The limiting amp shapes the output
of the equalizer. The regenerated XAUI lanes are trans-
mitted as CML signals. The source impedance and ter-
mination impedances are 100
Ω differential.
General Theory of Operation
Internally, the MAX3980 comprises signal-detect cir-
cuitry, four matched equalizers, and one equalizer-
control loop. The four equalizers are made up of a mas-
ter equalizer and three slave equalizers. The adaptive
control is generated from only channel 1. It is assumed
that all channels have the same characterization in fre-
quency content, coding, and transmission length.
The master equalizer consists of the following functions:
signal detect, adaptive equalizer, equalizer control, and
limiting and output drivers. The signal detect indicates
input signal power. When the input signal level is suffi-
ciently high, the SDET output is asserted. This does not
directly control the operation of the part.
The equalizer core reduces intersymbol interference
(ISI), compensating for frequency-dependent, media-
induced loss. The equalization control detects the
spectral contents of the input signal and provides a
control voltage to the equalizer core, adapting it to dif-
ferent media. The equalizer operation is optimized for
short-run DC-balanced transmission codes such as
8b/10b codes.
CML Input and Output Buffers
The input and output buffers are implemented using
CML. Equivalent circuits are shown in Figures 2 and 3.
For details on interfacing with CML, see Maxim applica-
tion note HFAN-1.0,
Interfacing Between CML, PECL,
and LVDS. The common-mode voltage of the input and
output is above 2.5V. AC-coupling capacitors are
required when interfacing this part. Values of 0.10F or
greater are recommended.
Media Equalization
Equalization at the input port compensates for the high-
frequency loss encountered with up to 40in (1.0m) of
FR-4 transmission lines. This part is optimized for 40in
and 3.125Gbps; however, the part reduces ISI for sig-
nals spanning longer distances and functions for data
rates from 2Gbps to 4Gbps, provided that short-length
balanced codes, such as 8b/10b, are used.
Applications Information
Standby Mode
The power-saver standby state allows reduced-power
operation. The TTL input, EN, must be set to TTL high
for normal operation. A TTL low at EN forces the equal-
izer into the standby state. The signal EN does not
affect the operation of the signal detect (SDET) func-
tion. For constant operation, connect the EN signal
directly to VCC.
3.125Gbps XAUI Quad Equalizer
6
_______________________________________________________________________________________
Functional Diagram
IN1+
IN1-
EQUALIZER
LIMITING
AMP
2
3
4
2
3
4
2
3
4
2
3
4
2
3
4
2
3
4
OUT1+
OUT1-
2
3
4
2
3
4
EN
POWER
MANAGEMENT
SDET FUNCTION IS
INDEPENDENT OF EN
SDET
TTL
CML
SIGNAL
DETECT
IP1, IN1 ONLY
MAX3980
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3980UTH+ | 功能描述:均衡器 3.125Gbps XAUI Quad Equalizer RoHS:否 制造商:Texas Instruments |
| MAX3980UTH+D | 制造商:Maxim Integrated Products 功能描述:#EMPTY - Rail/Tube |
| MAX3980UTH+T | 功能描述:IC XAUI QUAD EQUAL 44-TQFN RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:* 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁(yè)面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
| MAX3980UTH+TD | 制造商:Maxim Integrated Products 功能描述:#EMPTY - Tape and Reel |
| MAX3981UGH | 制造商:Maxim Integrated Products 功能描述: |
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