- 您现在的位置：买卖IC网 > PDF目录80567 > M902-01I156.2500LF (INTEGRATED DEVICE TECHNOLOGY INC) 156.25 MHz, OTHER CLOCK GENERATOR, CQCC36 PDF资料下载
参数资料
| 型号： | M902-01I156.2500LF |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 156.25 MHz, OTHER CLOCK GENERATOR, CQCC36 |
| 封装： | 9 X 9 MM, CERAMIC, LCC-36 |
| 文件页数： | 3/8页 |
| 文件大小： | 328K |
| 代理商： | M902-01I156.2500LF |
M902-01 Datasheet Rev 2.1
3 of 8
Revised 24Jun2004
Integr ated Circuit Systems , Inc. ● Netw o r ki ng & C o mmun ica t io ns ● ww w. icst.com ● tel (5 08) 85 2-54 00
M902-01
VCSO BASED GBE CLOCK GENERATOR
Prod uct Data Sh eet
FUNCTIONAL DESCRIPTION
The M902-01 is a PLL (Phase Locked Loop) based
clock generator that generates output clocks
synchronized to an input reference clock.
The M902-01 combines the flexibility of a VCSO
(Voltage Controlled SAW Oscillator) with the stability of
a crystal oscillator.
Input Reference
The input reference can either be an external, discrete
crystal or a stable external clock source such as a
packaged (temperature-compensated) crystal
oscillator.
If an external crystal is used with the on-chip crystal
oscillator circuit (XTAL OSC), the external crystal
should be a parallel-resonant, fundamental mode
crystal. Apply it to the XTAL_1 / REF_IN and XTAL_2 input
pins. External crystal load trim capacitors are also
required. (See “Crystal Specifications” on pg. 4.)
If an external LVCMOS/LVTTL clock source is used,
apply it to the XTAL_1 / REF_IN input pin.
In either case, the reference clock is supplied to the
phase detector of the PLL. The M902-01 includes a
reference divider that divides the input reference
frequency by a fixed value “R” and provides the result to
the phase detector.
The EX_CLK pin is available for a clock feed-through
mode for testing. See “External Clock Feed-through”
on pg. 3.
The PLL
The PLL (Phase Locked Loop) includes the phase
detector, the VCSO, a feedback divider (labeled
“M Divider”), and a reference divider (“R Divider”).
The feedback divider divides the VCSO output
frequency by a fixed value “M” to match the reference
frequency provided to the phase detector by the
reference divider.
By controlling the frequency and phase of the VCSO,
the phase detector precisely locks the frequency and
phase of the feedback divider output to that of the
reference divider output.
The relationship between the VCSO output frequency,
the M Divider, the R Divider and the input reference
frequency is defined as follows:
For the M902-01-156.2500 (see “Ordering Information” on pg. 8):
VCSO output frequency = 156.25MHz
Input reference frequency = 25MHz
M=25
R= 4
Therefore, for the M902-01-156.2500:
25
156.25MHz = 25MHz
4
The product of the input crystal frequency and
falls within the lock range of the VCSO.
External Clock Feed-through
The EXT_CLK pin provides an input for an external
single-ended clock that directly drives the LVPECL
clock outputs. This pin is intended for system debugging
and performance evaluation..
STOP Clock
The STOP pin puts the output clock into a static condition.
EN_EXT_CLK
Logic 1 enables the EXT_CLK input.
Use Logic 0 for normal operation.
EXT_CLK
Apply an external LVCMOS/LVTTL clock source
for 0 to 200 MHz feed-through operation.
Leave inactive for normal operation.1
Note 1: In applications where EXT_CLK is active while the SAW PLL
signal path is enabled, it is necessary to gate the EXT_CLK to
minimize jitter in the LVPECL output pairs. See the PCB Design
Guidelines for ICS SAW PLLs application note at
Logic 1 Output clocks are static
Logic 0 Output clocks enabled for normal operation
Fvcso
Fxtal
M
R
-----
×
=
----------
×
M
R
-----
相关PDF资料 |
PDF描述 |
|---|---|
| M906-01I190.0000 | 190 MHz, OTHER CLOCK GENERATOR, CQCC36 |
| MK1442-01SLF | 100 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO16 |
| MK2049-45ASITR | 125 MHz, OTHER CLOCK GENERATOR, PDSO20 |
| MK2751-01STR | 66 MHz, VIDEO CLOCK GENERATOR, PDSO16 |
| MK3712STR | 27 MHz, OTHER CLOCK GENERATOR, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M902-01I187.5000 | 制造商:ICS 制造商全称:ICS 功能描述:VCSO BASED GBE CLOCK GENERATOR |
| M9022 | 制造商:Tamura Corporation of America 功能描述: |
| M902-2243 | 制造商:TE Connectivity 功能描述:CONNECTOR |
| M9023 | 制造商:Tamura Corporation of America 功能描述: |
| M90-25042-10SL | 功能描述:环形MIL规格工具、五金与附件 CAP W/CHAIN EXT THRD 5/8-24UNEF-2B THREAD RoHS:否 制造商:Amphenol Industrial MIL 类型:MIL-DTL-5015 系列:97 产品类型:Dummy Receptacles 用于:97 Series Plugs |
发布紧急采购，3分钟左右您将得到回复。