MK3715 [ICSI]
LOW COST 3.3 VOLT VCXO; 低成本3.3伏VCXO
| 型号： | MK3715 |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | LOW COST 3.3 VOLT VCXO |
| 文件： | 总6页 (文件大小：117K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK3715
LOW COST 3.3 VOLT VCXO
Description
Features
The MK3715 is a low 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’
patented VCXO techniques, the device uses an
inexpensive external 13.5 MHz pullable crystal to
produce two fixed clock outputs of 54.0 MHz and 108.0
MHz.
• Packaged in 8 pin SOIC
• 3.3 V only operating voltage
• Provides two fixed clock outputs of 54.0 MHzand
108.0 MHz
• Uses an inexpensive pullable 13.5 MHz
externalcrystal
• On-chip VCXO (patented) with pull range of200ppm
(minimum)
ICS manufactures a large variety of Set-Top Box and
multimedia clock synthesizers for all applications. If
more clock outputs are needed, see the MK2731 or
MK377x family of parts. Consult ICS to eliminate
VCXOs, crystals and oscillators from your board.
• VCXO tuning voltage of 0 to 3.3 V
• 12mA output drive capability at TTL levels
• Advanced, low power, sub-micron CMOS process
Block Diagram
VIN
54.0 MHz
X1
Voltage
PLL and
13.5 MHz
Pullable
Controlled
Multiplier
Crystal
Crystal
108.0 MHz
Oscillator
X2
MDS 3715 B
1
Revision 021804
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK3715
LOW COST 3.3 VOLT VCXO
Pin Assignment
X1
VDD
VI N
8
7
6
5
1
2
3
4
X2
108M
54M
VDD
GND
8-Pi n ( 150 mi l ) SOI C
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
2
3
XI
Input
Crystal connection. Connect to a pullable 13.5 MHz crystal.
VDD
VIN
Power Connect to +3.3 V.
Input Voltage input to VCXO. Zero to 3.3 V analog input which controls
the VCXO frequency.
4
5
6
7
8
GND
VDD
54M
108M
X2
Power Connect to ground.
Power Connect to +3.3 V.
Output Fixed clock output of 54.0 MHz.
Output Fixed clock output of 108.0 MHz.
Input
Crystal connection. Connect to a pullable 13.5 MHz crystal.
MDS 3715 B
2
Revision 021804
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK3715
LOW COST 3.3 VOLT VCXO
Recommended Crystal Parameters:
External Component Selection
Initial Accuracy at 25°C
Drift Over Temperature and Aging
Load Capacitance
20 ppm
50 ppm
14 pf
The MK3715 requires a minimum number of external
components for proper operation.
C0/C1 Ratio
Equivalent Series Resistance
240 Max
35 Ω Max
Decoupling Capacitors
A decoupling capacitor of 0.01µF should be connected
between VDD and GND on pins 2 and 4 as close to the
MK3715 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.
The external crystal must be connected as close to the
chip as possible and should be on the same side of the
PCB as the MK3715. There should be no via’s between
the crystal pins and the X1 and X2 device pins. There
should be no signal traces underneath or close to the
crystal. See application note MAN05.
Series Termination Resistor
Crystal Tuning Load Capacitors
When the PCB trace between the clock output and the
load is over 1 inch, series termination should be used.
To series terminate a 50Ω trace (a commonly used
trace impedance), place a 33Ω resistor in series with
the clock line, as close to the clock output pin as
possible. The nominal impedance of the clock output is
20Ω.
The crystal traces should include pads for small fixed
capacitors, one between X1 and ground, and another
between X2 and ground. Stuffing of these capacitors
on the PCB is optional. The need for these capacitors is
determined at system prototype evaluation, and is
influenced by the particular crystal used (manufacture
and frequency) and by PCB layout. The typical required
capacitor value is 1 to 4 pF.
Quartz Crystal
The MK3715 VCXO function consists of the external
crystal and the integrated VCXO oscillator circuit. To
assure the best system performance (frequency pull
range) and reliability, a crystal device with the
recommended parameters (shown below) must be
used, and the layout guidelines discussed in the
following section shown must be followed.
The procedure for determining the value of these
capacitors can be found in application note MAN05.
The oscillation frequency of a quartz crystal is
determined by its “cut” and by the load capacitors
connected to it. The MK3715 incorporates on-chip
variable load capacitors that “pull” (change) the
frequency of the crystal. The crystal specified for use
with the MK3715 is designed to have zero frequency
error when the total of on-chip + stray capacitance is
14 pF.
MDS 3715 B
3
Revision 021804
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK3715
LOW COST 3.3 VOLT VCXO
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK3715. 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
Rating
Supply Voltage, VDD
All Inputs and Outputs
7 V
-0.5 V to VDD+0.5 V
0 to +70°C
Ambient Operating Temperature
Storage Temperature
-65 to +150°C
260°C
Soldering Temperature
Recommended Operation Conditions
Parameter
Min.
Typ.
Max.
+70
Units
°C
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
Reference crystal parameters
0
–
+3.15
+3.45
V
Refer to page 3
Thermal Characteristics
Parameter
Symbol
Conditions
Min.
Typ. Max. Units
Thermal Resistance Junction to
Ambient
θ
θ
θ
θ
Still air
150
140
120
40
°C/W
°C/W
°C/W
°C/W
JA
JA
JA
JC
1 m/s air flow
3 m/s air flow
Thermal Resistance Junction to Case
MDS 3715 B
4
Revision 021804
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK3715
LOW COST 3.3 VOLT VCXO
DC Electrical Characteristics
VDD=3.3 V 5% , Ambient temperature 0 to +70°C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
3.15
2.4
Typ.
Max.
Units
Operating Voltage
VDD
3.45
V
V
V
V
Output High Voltage
Output Low Voltage
V
I
I
I
= -12 mA
= 12 mA
= -4 mA
OH
OH
OL
OH
V
0.4
OL
Output High Voltage (CMOS
Level)
V
VDD-0.4
OH
Operating Supply Current
Short Circuit Current
IDD
No load
6
mA
mA
V
I
50
OS
VIN, VCXO Control Voltage
V
0
3.3
IA
AC Electrical Characteristics
VDD = 3.3 V 5%, Ambient Temperature 0 to +70° C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
+100
40
Typ.
Max. Units
Input Crystal Frequency
Input Crystal Accuracy
Output Frequency Pullability
Output Clock Rise Time
Output Clock Fall Time
Output Clock Duty Cycle
13.500000
MHz
Note 1
F
0V< VIN < 3.3 V, Note 1
0.8 to 2.0 V
ppm
P
t
1.5
1.5
60
ns
ns
%
OR
t
2.0 to 0.8 V
OF
t
At VDD/2
50
D
Maximum Absolute Jitter,
short term
t
110
ps
J
Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3.
MDS 3715 B
5
Revision 021804
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
MK3715
LOW COST 3.3 VOLT VCXO
Package Outline and Package Dimensions (8-pin SOIC)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
Inches
Min Max
0.0532 0.0688
0.0040 0.0098
Symbol
Min
1.35
0.10
0.33
0.19
4.80
3.80
Max
1.75
0.25
0.51
0.25
5.00
4.00
A
A1
B
C
D
E
e
0.013
0.0075 0.0098
.1890 .1968
0.020
Index
Area
0.1497 0.1574
0.050 Basic
E
H
1.27 Basic
H
h
L
5.80
0.25
0.40
0°
6.20
0.50
1.27
8°
0.2284 0.2440
0.010
0.016
0°
0.020
0.050
8°
a
Pin 1
D
h x 450
A
Q
c
e
b
Ordering Information
Part / Order Number
MK3715S
Marking
3715S
Shipping packaging
Tubes
Package
8-pin SOIC
Temperature
0 to +70° C
MK3715STR
3715S
Tape and Reel
8-pin SOIC
0 to +70° C
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (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 3715 B
6
Revision 021804
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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