MK3721STR [ICSI]
Low Cost 3.3 Volt VCXO; 低成本3.3伏VCXO
| 型号： | MK3721STR |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | Low Cost 3.3 Volt VCXO |
| 文件： | 总4页 (文件大小：62K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK3721
Low Cost 3.3 Volt VCXO
I CR O C LOC K
Features
Description
The MK3721 is ICS/MicroClock’s lowest cost,
low jitter, high performance 3.3 volt VCXO
designed to replace expensive VCXO modules.
The on-chip Voltage Controlled Crystal Oscillator
accepts a 0 to 3.3 V input voltage to cause the
output clocks to vary by ±100 ppm. Using
ICS/MicroClock’s patented VCXO techniques,
the device uses an inexpensive external pullable
crystal in the range of 16.2 - 28 MHz to produce a
VCXO output clock at that same frequency.
• Packaged in 8 pin SOIC
• 3.3 V operating voltage
• 16.2 MHz to 28 MHz operation
• Uses an inexpensive external crystal
• On-chip VCXO (patented) with pull range of
200 ppm (minimum)
• VCXO tuning voltage of 0 to 3.3 V
• 12 mA output drive capability at TTL levels
• Advanced, low power, sub-micron CMOS process
• For frequencies between 8 MHz to 16 MHz, use
the MK3711A. For frequencies between 1 MHz
and 8 MHz, use the MK3713. For higher than
28 MHz, use the MK3732-05
ICS/MicroClock manufactures the largest variety
of Set-Top Box and multimedia clock synthesizers
for all applications. If more clock outputs are
needed, see the MK3732 or MK377x family of
parts. Consult ICS/MicroClock to eliminate
VCXOs, crystals and oscillators from your board.
Block Diagram
VIN
X1
Output
Voltage
Controlled
Crystal
16.2 - 28 MHz Clock
Buffer
16.2 -28 MHz
pullable crystal
(REFOUT)
Oscillator
X2
MDS 3721 B
1
Revision 082800
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA • 95126• (408)295-9800tel • www.icst.com
MK3721
Low Cost 3.3 Volt VCXO
I CR O C LOC K
Pin Assignment
MK3721
1
2
3
4
8
7
6
5
X2
X1
VDD
VIN
DC
REFOUT (VCXO)
GND
DC
8 pin (150 mil) SOIC
Pin Descriptions
Number
Name
X1
Description
1
2
3
4
5
6
7
8
Crystal connection. Connect to a pullable 16.2 - 28 MHz crystal.
VDD. Connect to + 3.3 V.
VDD
VIN
GND
DC
Voltage input to VCXO. Zero to 3.3 V analog input which controls the frequency of the VCXO.
Connect to ground.
Don't Connect anything to this pin.
REFOUT VCXO CMOS level clock output matches the nominal frequency of the crystal.
DC
X2
Don't Connect anything to this pin.
Crystal connection. Connect to a pullable 16.2 - 28 MHz crystal.
Crystal Specifications
Correlation (load) capacitance
Initial accuracy
Drift over temperature and aging
C0/C1 ratio
14 pF
±20 ppm maximum
±50 ppm maximum
240 maximum
ESR
35 Wmaximum
MDS 3721 B
2
Revision 082800
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA • 95126• (408)295-9800tel • www.icst.com
MK3721
Low Cost 3.3 Volt VCXO
I CR O C LOC K
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum Units
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply voltage, VDD
Referenced to GND
7
VDD+0.5
70
V
V
Inputs and Clock Outputs
Ambient Operating Temperature
Soldering Temperature
Storage temperature
Referenced to GND
Max of 10 seconds
-0.5
0
°C
°C
°C
260
-65
150
DC CHARACTERISTICS (VDD = 3.3 V unless noted)
Operating Voltage, VDD
3.15
2.4
3.45
0.4
V
V
Output High Voltage, VOH
Output Low Voltage, VOL
IOH=-12mA
IOL=12mA
IOH=-4mA
No Load
V
Output High Voltage, VOH, CMOS level
Operating Supply Current, IDD
Short Circuit Current
VDD-0.4
V
4
mA
mA
V
±50
VIN, VCXO control voltage
0
3.3
AC CHARACTERISTICS (VDD = 3.3 V unless noted)
Input Crystal Frequency
16.2
28
±30
1.5
1.5
60
MH z
ppm
ns
Input Crystal Accuracy
Output Clock Rise Time
0.8 to 2.0V
2.0 to 0.8V
At VDD/2
Output Clock Fall Time
ns
Output Clock Duty Cycle
40
50
%
Maximum Absolute Jitter, short term
Output frequency pullability, note 2
±55
ps
0V £ VIN £ 3.3 V
±100
ppm
Notes: 1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged
exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability.
2. With a ICS/MicroClock approved pullable crystal.
External Components
The MK3721 requires a minimum number of external components for proper operation. A decoupling
capacitor of 0.01µF should be connected between VDD and GND on pins 2 and 4, as close to the
MK3721 as possible. A series termination resistor of 33 Wmay be used for the clock output. The input
crystal must be connected as close to the chip as possible. The input crystal should be a parallel mode,
pullable, AT cut, with 14 pF load capacitance. See previous page for crystal specifications. Consult ICS for
recommended suppliers. IMPORTANT - read application note MAN05 before laying out the PCB.
MDS 3721 B
3
Revision 082800
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA • 95126• (408)295-9800tel • www.icst.com
MK3721
Low Cost 3.3 Volt VCXO
I CR O C LOC K
Package Outline and Package Dimensions
(For current dimensional specifications, see JEDEC Publication No. 95.)
8 pin SOIC
Inches
Min
Millimeters
Symbol
Max
Min
1.35
0.10
0.33
0.19
4.80
3.80
1.27 BSC
5.80
0.25
0.41
Max
A
A1
B
C
D
E
0.0532 0.0688
0.0040 0.0098
0.0130 0.0200
0.0075 0.0098
0.1890 0.1968
0.1497 0.1574
.050 BSC
1.75
0.24
0.51
0.24
5.00
4.00
E
H
INDEX
AREA
e
D
H
h
0.2284 0.2440
0.0099 0.0195
0.0160 0.0500
6.20
0.50
1.27
A
L
L
A1
C
B
e
Ordering Information
Part/Order Number
MK3721S
Marking
Shipping packaging
tubes
Package
Temperature
0-70 °C
MK3721S
MK3721S
8 pin SOIC
8 pin SOIC
MK3721STR
tape and reel
0-70 °C
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems Incorporated (ICS) assumes no responsibility for either its
use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is
intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary
environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does
not authorize or warrant any ICS product for use in life support devices or critical medical instruments.
MDS 3721 B
4
Revision 082800
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA • 95126• (408)295-9800tel • www.icst.com
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