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| 型号： | MAX3980UTH+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/9页 |
| 文件大小： | 0K |
| 描述： | IC XAUI QUAD EQUAL 44-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | * |
| 应用： | * |
| 接口： | * |
| 电源电压： | * |
| 封装/外壳： | 44-WFQFN 裸露焊盘 |
| 供应商设备封装： | 44-TQFN-EP（7x7） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
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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相关代理商/技术参数 |
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| MAX3981UGH | 制造商:Maxim Integrated Products 功能描述: |
| MAX3981UTH+ | 功能描述:IC XAUI QUAD EQUAL 44-TQFN RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:* 标准包装:3,000 系列:- 应用:PDA，便携式音频/视频，智能电话 接口:I²C，2 线串口 电源电压:1.65 V ~ 3.6 V 封装/外壳:24-WQFN 裸露焊盘 供应商设备封装:24-QFN 裸露焊盘（4x4） 包装:带卷 (TR) 安装类型:表面贴装 产品目录页面:1015 (CN2011-ZH PDF) 其它名称:296-25223-2 |
| MAX3981UTH+T | 功能描述:IC XAUI QUAD EQUAL 44-TQFN RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:* 标准包装:3,000 系列:- 应用:PDA，便携式音频/视频，智能电话 接口:I²C，2 线串口 电源电压:1.65 V ~ 3.6 V 封装/外壳:24-WQFN 裸露焊盘 供应商设备封装:24-QFN 裸露焊盘（4x4） 包装:带卷 (TR) 安装类型:表面贴装 产品目录页面:1015 (CN2011-ZH PDF) 其它名称:296-25223-2 |
| MAX3981UTH+TD | 制造商:Maxim Integrated Products 功能描述:3.125GBPS XAUI QUAD CABLE EQUALIZER - Tape and Reel |
| MAX3982EVKIT | 功能描述:缓冲器和线路驱动器 Evaluation Kit for the MAX3982 RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
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