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參數(shù)資料
| 型號： | AD9513/PCBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 16/28頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9513 |
| 設(shè)計資源： | AD9513/14/15 Eval Brd Schematics AD9513/14/15 Gerber Files AD9513 Eval Brd BOM |
| 標準包裝： | 1 |
| 主要目的： | 計時，時鐘分配 |
| 已用 IC / 零件： | AD9513 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | AD9513BCPZ-ND - IC CLOCK DIST 3OUT PLL 32LFCSP AD9513BCPZ-REEL7-ND - IC CLOCK DIST 3OUT PLL 32LFCSP |
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AD9513
Rev. 0 | Page 23 of 28
APPLICATIONS
USING THE AD9513 OUTPUTS FOR ADC CLOCK
APPLICATIONS
Any high speed, analog-to-digital converter (ADC) is extremely
sensitive to the quality of the sampling clock provided by the
user. An ADC can be thought of as a sampling mixer; any noise,
distortion, or timing jitter on the clock is combined with the
desired signal at the A/D output. Clock integrity requirements
scale with the analog input frequency and resolution, with
higher analog input frequency applications at ≥14-bit resolution
being the most stringent. The theoretical SNR of an ADC is
limited by the ADC resolution and the jitter on the sampling
clock. Considering an ideal ADC of infinite resolution where
the step size and quantization error can be ignored, the available
SNR can be expressed approximately by
×
=
j
ft
SNR
2π
1
log
20
where f is the highest analog frequency being digitized.
tj is the rms jitter on the sampling clock.
Figure 29 shows the required sampling clock jitter as a function
of the analog frequency and effective number of bits (ENOB).
fA FULL-SCALE SINE WAVE ANALOG FREQUENCY (MHz)
SN
R
(d
B
)
EN
O
B
10
1k
100
30
40
50
60
70
80
90
100
110
6
8
10
12
14
16
18
T
J
= 100f
S
200f
S
400f
S
1ps
2ps
10ps
SNR = 20log
1
2
πfATJ
05
595
-0
91
Figure 29. ENOB and SNR vs. Analog Input Frequency
See Application Note AN-756 and Application Note AN-501 at
Many high performance ADCs feature differential clock inputs
to simplify the task of providing the required low jitter clock on
a noisy PCB. (Distributing a single-ended clock on a noisy PCB
can result in coupled noise on the sample clock. Differential
distribution has inherent common-mode rejection that can
provide superior clock performance in a noisy environment.)
The AD9513 features LVDS outputs that provide differential
clock outputs, which enable clock solutions that maximize
converter SNR performance. The input requirements of the
ADC (differential or single-ended, logic level, termination)
should be considered when selecting the best clocking/
converter solution.
LVDS CLOCK DISTRIBUTION
The AD9513 provides three clock outputs that are selectable as
either CMOS or LVDS levels. LVDS uses a current mode output
stage. The current is 3.5 mA, which yields 350 mV output swing
across a 100 Ω resistor. The LVDS outputs meet or exceed all
ANSI/TIA/EIA-644 specifications.
A recommended termination circuit for the LVDS outputs
is shown in Figure 30.
VS
LVDS
100
DIFFERENTIAL (COUPLED)
VS
LVDS
100
05
595-
032
Figure 30. LVDS Output Termination
See Application Note AN-586 at www.analog.com for more
information on LVDS.
CMOS CLOCK DISTRIBUTION
The AD9513 provides three outputs that are selectable as either
CMOS or LVDS levels. When selected as CMOS, an output
provides for driving devices requiring CMOS level logic at their
clock inputs.
Whenever single-ended CMOS clocking is used, some of the
following general guidelines should be used.
Point-to-point nets should be designed such that a driver has
one receiver only on the net, if possible. This allows for simple
termination schemes and minimizes ringing due to possible
mismatched impedances on the net. Series termination at the
source is generally required to provide transmission line
matching and/or to reduce current transients at the driver.
The value of the resistor is dependent on the board design and
timing requirements (typically 10 Ω to 100 Ω is used). CMOS
outputs are also limited in terms of the capacitive load or trace
length that they can drive. Typically, trace lengths less than
3 inches are recommended to preserve signal rise/fall times
and preserve signal integrity.
10
MICROSTRIP
GND
5pF
60.4
1.0 INCH
CMOS
0
55
95-
0
33
Figure 31. Series Termination of CMOS Output
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9514 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.6 GHz Clock Distribution IC, Dividers, Delay Adjust, Three Outputs |
| AD9514/PCB | 制造商:Analog Devices 功能描述:CLOCK DISTRIBUTION - Bulk |
| AD9514/PCBZ | 功能描述:BOARD EVAL CLOCK 3CH AD9514 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 標準包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
| AD9514BCPZ | 功能描述:IC CLOCK DIST 3OUT PLL 32LFCSP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標準包裝:2,000 系列:- 類型:PLL 頻率合成器 PLL:是 輸入:晶體 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:1:1 差分 - 輸入:輸出:無/無 頻率 - 最大:1GHz 除法器/乘法器:是/無 電源電壓:4.5 V ~ 5.5 V 工作溫度:-20°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-LSSOP（0.175"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:NJW1504V-TE1-NDNJW1504V-TE1TR |
| AD9514BCPZ-REEL7 | 功能描述:IC CLOCK DIST 3OUT PLL 32LFCSP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標準包裝:1,000 系列:Precision Edge® 類型:時鐘/頻率合成器 PLL:無 輸入:CML，PECL 輸出:CML 電路數(shù):1 比率 - 輸入:輸出:2:1 差分 - 輸入:輸出:是/是 頻率 - 最大:10.7GHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VFQFN 裸露焊盤，16-MLF? 供應(yīng)商設(shè)備封裝:16-MLF?（3x3） 包裝:帶卷 (TR) 其它名稱:SY58052UMGTRSY58052UMGTR-ND |
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