參數(shù)資料
型號(hào)： AD9517-4A/PCBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 36/80頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD9517-4A
設(shè)計(jì)資源： High Performance, Dual Channel IF Sampling Receiver (CN0140)
AD9517 Eval Brd Schematics
AD9517 Gerber Files
AD9517-4 BOM
標(biāo)準(zhǔn)包裝： 1
主要目的： 計(jì)時(shí)，時(shí)鐘發(fā)生器
嵌入式： 否
已用 IC / 零件： AD9517-4A
主要屬性： 2 輸入，12 輸出，1.6GHz VCO
次要屬性： CMOS，LVPECL 和 LVDS 兼容
已供物品： 板
Data Sheet
AD9517-4
Rev. E | Page 41 of 80
VCO calibration must be manually initiated. This allows for
flexibility in deciding what order to program registers and when
to initiate a calibration, instead of having it happen every time
certain PLL registers have their values change. For example, this
allows for the VCO frequency to be changed by small amounts
without having an automatic calibration occur each time; this
should be done with caution and only when the user knows that
the VCO control voltage is not going to exceed the nominal best
performance limits. For example, a few 100 kHz steps are fine, but
a few MHz might not be. In addition, because the calibration
procedure results in rapid changes in the VCO frequency, the
distribution section is automatically placed in SYNC until the
calibration is finished. Therefore, this temporary loss of outputs
must be expected.
A VCO calibration should be initiated under the following
conditions:
After changing any of the PLL R, P, B, and A divider
settings, or after a change in the PLL reference clock
frequency. This, in effect, means any time a PLL register
or reference clock is changed such that a different VCO
frequency results.
Whenever system calibration is desired. The VCO is
designed to operate properly over extremes of temperatures
even when it is first calibrated at the opposite extreme.
However, a VCO calibration can be initiated at any time,
if desired.
CLOCK DISTRIBUTION
A clock channel consists of a pair (or double pair, in the case of
CMOS) of outputs that share a common divider. A clock output
consists of the drivers that connect to the output pins. The clock
outputs have either LVPECL or LVDS/CMOS signal levels at
the pins.
The AD9517 has four clock channels: two channels are LVPECL
(four outputs); two channels are LVDS/CMOS (up to four LVDS
outputs or up to eight CMOS outputs).
Each channel has its own programmable divider that divides
the clock frequency that is applied to its input. The LVPECL
channel dividers can divide by any integer from 2 to 32, or the
divider can be bypassed to achieve a divide by one. Each
LVDS/CMOS channel divider contains two of these divider
blocks in a cascaded configuration. The total division of the
channel is the product of the divide value of the cascaded dividers.
This allows divide values of (1 to 32) × (1 to 32), or up to 1024
(note that this is not all values from 1 to 1024 but only the set
of numbers that are the product of the two dividers).
If the user wishes to use the channel dividers, the VCO divider
must be used after the on-chip VCO. This is because the internal
VCO frequency is above the maximum channel divider input
frequency (1600 MHz). The VCO divider can be set to divide
by 2, 3, 4, 5, or 6. External clock signals connected to the CLK
input also require the VCO divider if the frequency of the signal
is greater than 1600 MHz.
The channel dividers allow for a selection of various duty cycles,
depending on the currently set division. That is, for any specific
division, D, the output of the divider can be set to high for
N + 1 input clock cycles and low for M + 1 input clock cycles
(where D = N + M + 2). For example, a divide-by-5 can be high
for one divider input cycle and low for four cycles, or a divide-
by-5 can be high for three divider input cycles and low for two
cycles. Other combinations are also possible.
The channel dividers include a duty-cycle correction function
that can be disabled. In contrast to the selectable duty cycle
just described, this function can correct a non-50% duty cycle
caused by an odd division. However, this requires that the
division be set by M = N + 1.
In addition, the channel dividers allow a coarse phase offset or
delay to be set. Depending on the division selected, the output
can be delayed by up to 31 input clock cycles. The divider
outputs can also be set to start high or start low.
Internal VCO or External CLK as Clock Source
The clock distribution of the AD9517 has two clock input
sources: an internal VCO or an external clock connected to the
CLK/CLK pins. Either the internal VCO or CLK must be
chosen as the source of the clock signal to distribute. When the
internal VCO is selected as the source, the VCO divider must be
used. When CLK is selected as the source, it is not necessary to
use the VCO divider if the CLK frequency is less than the
maximum channel divider input frequency (1600 MHz);
otherwise, the VCO divider must be used to reduce the
frequency to one acceptable by the channel dividers. Table 30
shows how the VCO, CLK, and VCO divider are selected.
Register 0x1E1[1:0] selects the channel divider source and
determines whether the VCO divider is used. It is not possible
to select the VCO without using the VCO divider.
Table 30. Selecting VCO or CLK as Source for Channel
Divider, and Whether VCO Divider Is Used
Register 0x1E1
Channel Divider Source
VCO Divider
Bit 1
Bit 0
0
CLK
Used
0
1
CLK
Not used
1
0
VCO
Used
1
Not allowed
CLK or VCO Direct to LVPECL Outputs
It is possible to connect either the internal VCO or the CLK
(whichever is selected as the input to the VCO divider) directly
to the LVPECL outputs, OUT0 to OUT3. This configuration
can pass frequencies up to the maximum frequency of the VCO
directly to the LVPECL outputs. The LVPECL outputs may not
be able to provide a full voltage swing at the highest frequencies.
相關(guān)PDF資料
PDF描述
FCBP110LD1L20 CABLE 10.5GBPS 20M LASERWIRE
VE-JTZ-EZ-S CONVERTER MOD DC/DC 2V 10W
AD9518-0A/PCBZ BOARD EVALUATION FOR AD9518-0A
FCBP110LD1L10S KIT 10M LASERWIRE SFP+
VE-JTX-EZ-S CONVERTER MOD DC/DC 5.2V 25W
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD9517-4BCPZ 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:IC CLOCK GENERATOR 1.8GHZ LFCSP-48 制造商:Analog Devices 功能描述:IC, CLOCK GENERATOR, 1.8GHZ, LFCSP-48, Clock IC Type:Clock Generator, Frequency:
AD9517-4BCPZ-REEL7 制造商:Analog Devices 功能描述:
AD9518-0 制造商:AD 制造商全稱:Analog Devices 功能描述:6-Output Clock Generator
AD9518-0/PCBZ 制造商:Analog Devices 功能描述:Evaluation Kit For 6-Output Clock Generator With Integrated 2.8 GHZ VCO
AD9518-0A/PCBZ 功能描述:BOARD EVALUATION FOR AD9518-0A RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*