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參數(shù)資料
| 型號(hào)： | MAX9209EVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/18頁 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX9209 |
| 其它有關(guān)文件： | Automotive Product Guide |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，串行器，解串器（串并行轉(zhuǎn)換器） |
| 已用 IC / 零件： | MAX9209 |
| 已供物品： | 板 |
MAX9209/MAX9213
Programmable DC-Balanced
21-Bit Serializers
14
______________________________________________________________________________________
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 14). The
RC time constant for four equal-value series capacitors
is (C x (RT + RO)) / 4 (Figure 15).
RT is required to match the transmission line imped-
ance (usually 100
) and RO is determined by the LVDS
driver design, with a minimum value of 78
(see the DC
Electrical Characteristics table). This leaves the capaci-
tor selection to change the system time constant.
In the following example, the capacitor value for a
droop of 2% is calculated. Jitter due to this droop is
then calculated assuming a 1ns transition time:
C = -(2 x tB x DSV) / (ln (1 - D) x (RT + RO)) (Eq 1)
where:
C = AC-coupling capacitor (F)
tB = bit time (s)
DSV = digital sum variation (integer)
ln = natural log
D = droop (% of signal amplitude)
RT = termination resistor (
)
(7 + 2):1
1:(9 - 2)
7
RT =
100
RT =
100
RT =
100
RT =
100
(7 + 2):1
1:(9 - 2)
7
(7 + 2):1
1:(9 - 2)
7
PLL
MAX9209
MAX9213
MAX9210
MAX9214
TxOUT
TxCLK OUT
RxIN
RxCLK IN
21:3 SERIALIZER
3:21 DESERIALIZER
PWRDWN
RxCLK OUT
RxOUT
PWRDWN
TxCLK IN
TxIN
HIGH-FREQUENCY CERAMIC
SURFACE-MOUNT CAPACITORS
RO
Figure 15. Four Capacitors per Link, AC-Coupled, DC-Balanced Mode
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9209EVKIT+ | 功能描述:界面開發(fā)工具 MAX9209/44 Eval Kit RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評(píng)估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| MAX9209GUM | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Programmable DC-Balanced 21-Bit Serializers |
| MAX9209GUM+ | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Programmable DC-Balanced 21-Bit Serializers |
| MAX9209GUM+D | 功能描述:串行器/解串器 - Serdes 21-Bit Bus LVDS Serializer RoHS:否 制造商:Texas Instruments 類型:Deserializer 數(shù)據(jù)速率:1.485 Gbit/s 輸入類型:ECL/LVDS 輸出類型:LVCMOS 輸入端數(shù)量:1 輸出端數(shù)量:20 工作電源電壓:2.375 V to 2.625 V 工作溫度范圍:0 C to + 70 C 封裝 / 箱體:TQFP-64 |
| MAX9209GUM+TD | 功能描述:串行器/解串器 - Serdes 21-Bit Bus LVDS Serializer RoHS:否 制造商:Texas Instruments 類型:Deserializer 數(shù)據(jù)速率:1.485 Gbit/s 輸入類型:ECL/LVDS 輸出類型:LVCMOS 輸入端數(shù)量:1 輸出端數(shù)量:20 工作電源電壓:2.375 V to 2.625 V 工作溫度范圍:0 C to + 70 C 封裝 / 箱體:TQFP-64 |
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