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MK3711B 데이터시트 PDF




Integrated Circuit Systems에서 제조한 전자 부품 MK3711B은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 MK3711B 기능
기능 LOW COST 8 - 16 MHZ 3.3 VOLT VCXO
제조업체 Integrated Circuit Systems
로고 Integrated Circuit Systems 로고


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MK3711B 데이터시트, 핀배열, 회로
MK3711
LOW COST 8 - 16 MHZ 3.3 VOLT VCXO
Description
The MK3711 series of devices include the original
MK3711S, MK3711A, and the new MK3711B and
MK3711D. The MK3711D and MK3711B are drop-in
replacements for the MK3711S and MK3711A devices.
Compared to these earlier devices the MK3711D and
MK3711B offer a wider operating frequency range and
improved power supply noise rejection.
The MK3711 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 MK3711 is
designed primarily for data and clock recovery
applications within end products such as ADSL
modems, set-top box receivers, and telecom systems.
The MK3711D exhibits a moderate VCXO gain of
120ppm/V typical, when used with a high quality
external pullable quartz crystal. The MK3711B offers a
higher VCXO gain of 150ppm/V, similar to the earlier
MK3711A. The higher intrinsic VCXO gain of the
MK3711C 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. Since VIN is
a high impedance input, it can be driven directly from
Block Diagram
an PWM RC integrator circuit. Frequency output
increases with VIN voltage input. The usable range of
VIN is 0 to 3V.
Features
MK3711D and MK3711B are drop-in replacements
for the earlier MK3711S and MK3711A devices
MK3711D and MK3711B offer 24-36 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 (MK3711D)
VCXO tuning voltage 0 to 3.3 V
Packaged in 8 pin SOIC (150 mil wide)
MK3711D is Recommended for New Designs
V IN
8 -1 6 M H z
P u lla b le
C ry s ta l
X1
X2
V o lta g e
C o n tro lle d
C ry s ta l
O s c illa to r
VDD
8 -1 6 M H z
GND
MDS 3711 F
1
Revision 070301
Integrated Circuit Systems q 525 Race Street, San Jose, CA 95126 q tel (408) 295-9800 q www.icst.com




MK3711B pdf, 반도체, 판매, 대치품
MK3711
LOW COST 8 - 16 MHZ 3.3 VOLT VCXO
ftarget = nominal crystal frequency
errorxtal =actual initial accuracy (in ppm) of the crystal
being measured
If the centering error is less than ±25 ppm, no
adjustment is needed. If the centering error is more
than 25ppm negative, the PC board has excessive
stray capacitance and a new PCB layout should be
considered to reduce stray capacitance. (Alternately,
the crystal may be re-specified to a higher load
capacitance. Contact ICS MicroClock for details.) If the
centering error is more than 25ppm positive, add
identical fixed centering capacitors from each crystal
pin to ground. The value for each of these caps (in pF)
is given by:
External Capacitor =
2 x (centering error)/(trim sensitivity)
Trim sensitivity is a parameter which can be supplied
by your crystal vendor. If you do not know the value,
assume it is 30 ppm/pF. After any changes, repeat the
measurement to verify that the remaining error is
acceptably low (typically less than ±25ppm).
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK3711. These ratings,
which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of
the device at these or any other conditions above those indicated in the operational sections of the
specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can
affect product reliability. Electrical parameters are guaranteed only over the recommended operating
temperature range.
Item
Supply Voltage, VDD
All Inputs and Outputs
Ambient Operating Temperature
Storage Temperature
Soldering Temperature
Rating
7V
-0.5V to VDD+0.5V
0 to +70°C
-65 to +150°C
260°C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
Reference crystal parameters
Min.
0
+3.15
Typ.
Max.
– +70
+3.45
Refer to page 3
Units
°C
V
MDS 3711 F
4
Revision 070301
Integrated Circuit Systems q 525 Race Street, San Jose, CA 95126 q tel (408) 295-9800 q www.icst.com

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