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參數(shù)資料
| 型號： | MK3727STR |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 27 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | 0.150 INCH, SOIC-8 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 136K |
| 代理商： | MK3727STR |
MK3727
MDS 3727 L
1
Revision 091205
In te grat ed C i rc ui t Syst em s
5 25 Race Street, San Jose, CA 95 126
te l (40 8 ) 29 7-120 1
www.ics t.co m
LOW COST 24 TO 36 MHZ 3.3 VOLT VCXO
Description
The MK3727 series of devices include the original
MK3727S, and the new MK3727C and MK3727D. The
MK3727D and MK3727C are drop-in replacements for
the MK3727S device. Compared to these earlier
devices, the MK3727D and MK3727C offer a wider
operating frequency range and improved power supply
noise rejection. The MK3727D is recommended for
new designs.
The MK3727 series combines the functions of a VCXO
(Voltage Controlled Crystal Oscillator) and PLL (Phase
Locked Loop) frequency doubler onto a single chip.
Used in conjunction with an external pullable quartz
crystal, this monolithic integrated circuit replaces more
costly hybrid (canned) VCXO devices. The MK3727 is
designed primarily for data and clock recovery
applications within end products such as ADSL
modems, set-top box receivers, and telecom systems.
The MK3727D is recommended for new designs. The
MK3727D exhibits a moderate VCXO gain of
120ppm/V typical, when used with a high quality
external pullable quartz crystal. The MK3727C offers a
higher VCXO gain of 150ppm/V. The higher intrinsic
VCXO gain of the MK3727C may help compensate for
the reduced pullability of a low quality crystal used in
some applications. However, higher VCXO gain may
also increase clock output phase noise.
The frequency of the on-chip VCXO is adjusted by an
external control voltage input into pin VIN. Because
VIN is a high impedance input, it can be driven directly
from an PWM RC integrator circuit. Frequency output
increases with VIN voltage input. The usable range of
VIN is 0 to 3 V.
Features
MK3727D and MK3727C are drop-in upgrades to the
earlier MK3727S device
MK3727D and MK3727C offer 24 to 36 MHz output
frequency range (output frequency = 2x crystal
frequency) and improved power supply noise
rejection
Uses an inexpensive 12 to 18 MHz external crystal
Ideal for ADSL applications using 17.664 MHz
external pullable crystal to generate locked 35.328
MHz clock physical layer clock
Ideal for set-top box applications using 13.5 MHz
external pullable crystal to generate lock 27 MHz
clock transport video clock
On-chip VCXO with guaranteed pull range of ±115
ppm minimum (MK3727D)
VCXO input tuning voltage 0 to 3.3 V
Packaged in 8-pin SOIC (150 mil wide)
Available in Pb-free packaging
MK3727D is recommended for new designs.
Block Diagram
24 to 36 M H z
(2 x C rysta l F re q u e n cy)
X1
X2
Volta g e
Co ntro lle d
Cry s ta l
Os c illa to r
PLL
Fre que nc y
D ouble r
VIN
1 2 to 1 8 M H z
P u lla b le
Crysta l
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