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| 型号： | MAX9242EUM+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/23页 |
| 文件大小： | 0K |
| 描述： | SEMICONDUCTOR OTHER |
| 标准包装： | 39 |
| 系列： | * |
MAX9242/MAX9244/MAX9246/MAX9254
21-Bit Deserializers with Programmable
Spread Spectrum and DC Balance
16
______________________________________________________________________________________
DC-coupled link (2.4V - 1.425V = 0.975V and 1.075V -
0V = 1.075V). Common-mode voltage differences may
be due to ground potential variation or common-mode
noise. If there is more than
±1V of difference, the receiver
is not guaranteed to read the input signal correctly and
may cause bit errors. AC-coupling filters low-frequency
ground shifts and common-mode noise and passes
high-frequency data. A common-mode voltage differ-
ence up to the voltage rating of the coupling capacitor
(minus half the differential swing) is tolerated. DC-bal-
anced coding of the data is required to maintain the
differential signal amplitude and limit jitter on an
AC-coupled link. A capacitor in series with each output
of the LVDS driver is sufficient for AC-coupling. However,
two capacitors—one at the serializer output and one at
the deserializer input—provide protection in case either
end of the cable is shorted to a high voltage.
Applications Information
Selection of AC-Coupling Capacitors
Voltage droop and the DSV of transmitted symbols
cause signal transitions to start from different voltage
levels. Because the transition time is finite, starting the
signal transition from different voltage levels causes
timing jitter. The time constant for an AC-coupled link
needs to be chosen to reduce droop and jitter to an
acceptable level.
The RC network for an AC-coupled link consists of the
LVDS receiver termination resistor (RT), the LVDS driver
output resistor (RO), and the series AC-coupling capac-
itors (C). The RC time constant for two equal-value
series capacitors is (C x (RT + RO)) / 2 (Figure 19). The
RC time constant for four equal-value series capacitors
is (C x (RT + RO)) / 4 (Figure 20).
RPLLS (65,600 x RCIP)
LOW
RxCLKOUT
INTERNAL
PLL1 LOCK
INTERNAL
SSPLL LOCK
RxOUT_
LOW
Figure 16. Output Waveforms when PLL1 Loses Lock and Locks Again
RPLLS2 (32,800 x RCIP)
LOW
INTERNAL
SSPLL LOCK
RxCLKOUT
RxOUT_
TIMING SHOWN FOR STABLE CLOCK AND DATA INPUTS
Figure 17. Output Waveforms if Spread-Spectrum PLL Loses Lock and Locks Again
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9242EUM/V+ | 功能描述:串行器/解串器 - Serdes 21-Bit DC-Balanced LVDS Deserializer RoHS:否 制造商:Texas Instruments 类型:Deserializer 数据速率:1.485 Gbit/s 输入类型:ECL/LVDS 输出类型:LVCMOS 输入端数量:1 输出端数量:20 工作电源电压:2.375 V to 2.625 V 工作温度范围:0 C to + 70 C 封装 / 箱体:TQFP-64 |
| MAX9242EUM/V+T | 功能描述:串行器/解串器 - Serdes 21-Bit DC-Balanced LVDS Deserializer RoHS:否 制造商:Texas Instruments 类型:Deserializer 数据速率:1.485 Gbit/s 输入类型:ECL/LVDS 输出类型:LVCMOS 输入端数量:1 输出端数量:20 工作电源电压:2.375 V to 2.625 V 工作温度范围:0 C to + 70 C 封装 / 箱体:TQFP-64 |
| MAX9242EUM+ | 功能描述:串行器/解串器 - Serdes 21-Bit DC-Balanced LVDS Deserializer RoHS:否 制造商:Texas Instruments 类型:Deserializer 数据速率:1.485 Gbit/s 输入类型:ECL/LVDS 输出类型:LVCMOS 输入端数量:1 输出端数量:20 工作电源电压:2.375 V to 2.625 V 工作温度范围:0 C to + 70 C 封装 / 箱体:TQFP-64 |
| MAX9242EUM+D | 制造商:Maxim Integrated Products 功能描述:21-BIT DC-BALANCED LVDS DESERIALIZERS WITH SPREAD SPECTRUM - Rail/Tube |
| MAX9242EUM+T | 功能描述:串行器/解串器 - Serdes 21-Bit DC-Balanced LVDS Deserializer RoHS:否 制造商:Texas Instruments 类型:Deserializer 数据速率:1.485 Gbit/s 输入类型:ECL/LVDS 输出类型:LVCMOS 输入端数量:1 输出端数量:20 工作电源电压:2.375 V to 2.625 V 工作温度范围:0 C to + 70 C 封装 / 箱体:TQFP-64 |
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