MK3721STR [ICSI]

Low Cost 3.3 Volt VCXO; 低成本3.3伏VCXO
MK3721STR
型号: MK3721STR
厂家: INTEGRATED CIRCUIT SOLUTION INC    INTEGRATED CIRCUIT SOLUTION INC
描述:

Low Cost 3.3 Volt VCXO
低成本3.3伏VCXO

晶体 外围集成电路 石英晶振 压控振荡器 光电二极管 时钟
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MK3721  
Low Cost 3.3 Volt VCXO  
I CR O C LOC K  
Features  
Description  
The MK3721 is ICS/MicroClocks 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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