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參數(shù)資料
| 型號(hào)： | 1726M-11LF |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 32 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | 0.150 INCH, ROHS COMPLIANT, SOIC-8 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 92K |
| 代理商： | 1726M-11LF |
ICS1726-11
LOW EMI CLOCK GENERATOR
SSCG
IDT LOW EMI CLOCK GENERATOR
3
ICS1726-11
REV B 081010
External Components
The ICS1726-11 requires a minimum number of
external components for proper operation.
Decoupling Capacitor
A decoupling capacitor of 0.01F must be connected
between VDD and GND on pins 7 and 2, as close to
these pins as possible. For optimum device
performance, the decoupling capacitor should be
mounted on the component side of the PCB. Avoid the
use of vias in the decoupling circuit.
Series Termination Resistor
When the PCB trace between the clock output and the
load is over 1 inch, series termination should be used.
To series terminate a 50
Ωtrace (a commonly used trace
impedance) place a 33
Ωresistor in series with the clock
line, as close to the clock output pin as possible. The
nominal impedance of the clock output is 20
Ω.
Tri-level Select Pin Operation
The S1, S0 select pins are tri-level, meaning they have
three separate states to make the selections shown in
the table on page 2. To select the M (mid) level, the
connection to these pins must be eliminated by either
floating them, or tri-stating the driver connected to the
select pin.
PCB Layout Recommendations
For optimum device performance and lowest output
phase noise, the following guidelines should be
observed.
1) The 0.01F decoupling capacitor should be mounted
on the component side of the board as close to the VDD
pin as possible. No vias should be used between the
decoupling capacitor and VDD pin. The PCB trace to
VDD pin should be kept as short as possible, as should
the PCB trace to the ground via.
2) To minimize EMI, the 33
Ωseries termination resistor
(if needed) should be placed close to the clock output.
3) An optimum layout is one with all components on the
same side of the board, minimizing vias through other
signal layers. Other signal traces should be routed away
from the ICS1726-11. This includes signal traces just
underneath the device, or on layers adjacent to the
ground plane layer used by the device.
Crystal Information
The crystal used should be a fundamental mode (do not
use third overtone), parallel resonant. Crystal
capacitors should be connected from pins X1 to ground
and X2 to ground to optimize the initial accuracy. The
value of these capacitors is given by the following
equation:
Crystal caps (pF) = (CL - 6) x 2
In the equation, CL is the crystal load capacitance. So,
for a crystal with a 16 pF load capacitance, two 20 pF
[(16-6) x 2] capacitors should be used.
Spread Spectrum Profile
The ICS1726-11 low EMI clock generator uses an
optimized frequency slew rate to facilitate down stream
tracking by zero delay buffers and other PLL devices.
The frequency modulation amplitude is constant
despite variations of the input frequency.
Time
F
req
ue
nc
y
Modulation Rate
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| 1726-PT | 功能描述:化學(xué)物質(zhì) Z.C.ANTI-STAT-1PT RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Adhesives 類型:Epoxy Compound 大小:1.7 oz 外殼:Plastic Tube |
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