參數(shù)資料
型號(hào)： MAX9209GUM
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 通用總線功能
英文描述： Programmable DC-Balanced 21-Bit Serializers
中文描述： TRIPLE LINE DRIVER, PDSO48
封裝： 6.10 MM, MO-153ED, TSSOP-48
文件頁(yè)數(shù)： 14/20頁(yè)
文件大?。?/td> 333K
代理商： MAX9209GUM
M
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 (R
T
), the LVDS driver
output resistor (R
O
), and the series AC-coupling capac-
itors (C). The RC time constant for two equal-value
series capacitors is (C x (R
T
+ R
O
)) / 2 (Figure 14). The
RC time constant for four equal-value series capacitors
is (C x (R
T
+ R
O
)) / 4 (Figure 15).
R
T
is required to match the transmission line imped-
ance (usually 100
Ω
) and R
O
is determined by the LVDS
driver design, with a minimum value of 78
Ω
(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 t
B
x DSV) / (ln (1 - D) x (R
T
+ R
O
)) (Eq 1)
where:
C = AC-coupling capacitor (F)
t
B
= bit time (s)
DSV = digital sum variation (integer)
ln = natural log
D = droop (% of signal amplitude)
R
T
= termination resistor (
Ω
)
(7 + 2):1
1:(9 - 2)
7
7
R
T
=
100
Ω
R
T
=
100
Ω
R
T
=
100
Ω
R
T
=
100
Ω
(7 + 2):1
1:(9 - 2)
7
7
(7 + 2):1
1:(9 - 2)
7
7
PLL
PLL
MAX9209
MAX9211
MAX9213
MAX9215
MAX9210
MAX9212
MAX9214
MAX9216
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
R
O
R
O
R
O
R
O
Figure 15. Four Capacitors per Link, AC-Coupled, DC-Balanced Mode
相關(guān)PDF資料
PDF描述
MAX9217 27-Bit, 3MHz-to-35MHz DC-Balanced LVDS Serializer
MAX9217ECM 27-Bit, 3MHz-to-35MHz DC-Balanced LVDS Serializer
MAX9217ETM 27-Bit, 3MHz-to-35MHz DC-Balanced LVDS Serializer
MAX9232 Programmable Spread-Spectrum and DC-Balance 21-Bit Deserializer
MAX9232EUM Programmable Spread-Spectrum and DC-Balance 21-Bit Deserializer
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX9209GUM+ 制造商:MAXIM 制造商全稱(chēng):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(lèi)型:Deserializer 數(shù)據(jù)速率:1.485 Gbit/s 輸入類(lèi)型:ECL/LVDS 輸出類(lèi)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(lèi)型:Deserializer 數(shù)據(jù)速率:1.485 Gbit/s 輸入類(lèi)型:ECL/LVDS 輸出類(lèi)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
MAX920ESA 功能描述:校驗(yàn)器 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類(lèi)型: 通道數(shù)量: 輸出類(lèi)型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
MAX920ESA/GG8 制造商:Maxim Integrated Products 功能描述:- Bulk
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