View MK3715_778306.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MK3715
LOW COST 3.3 VOLT VCXO
Description
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. 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.
Features
* 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)
* 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 X1 54.0 MHz
13.5 MHz Pullable Crystal
X2
Voltage Controlled Crystal Oscillator
PLL and Multiplier
108.0 MHz
MDS 3715 B I n t e gra te d C i r c u i t S y s t e m s
1
525 Race Stre et, San Jo se, CA 9 5126
Revision 021804 te l (40 8) 2 97-12 01
w w w. i c st . c o m
MK3715 LOW COST 3.3 VOLT VCXO
Pin Assignment
X1 VDD VI N GND 1 2 3 4 8 7 6 5 X2 108M 54M VDD
8 - P i n ( 1 5 0 mi l ) S OI C
Pin Descriptions
Pin Number
1 2 3 4 5 6 7 8
Pin Name
XI VDD VIN GND VDD 54M 108M X2
Pin Type
Input Power Input Power Power Output Output Input Connect to +3.3 V.
Pin Description
Crystal connection. Connect to a pullable 13.5 MHz crystal. Voltage input to VCXO. Zero to 3.3 V analog input which controls the VCXO frequency. Connect to ground. Connect to +3.3 V. Fixed clock output of 54.0 MHz. Fixed clock output of 108.0 MHz. Crystal connection. Connect to a pullable 13.5 MHz crystal.
MDS 3715 B In te grated Circuit Systems
2
525 Ra ce Street, San Jose, CA 9512 6
Revision 021804 tel (4 08) 297-1 201
w w w. i c s t . c o m
MK3715 LOW COST 3.3 VOLT VCXO
External Component Selection
The MK3715 requires a minimum number of external components for proper operation.
Decoupling Capacitors
A decoupling capacitor of 0.01F 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.
Recommended Crystal Parameters: Initial Accuracy at 25C Drift Over Temperature and Aging Load Capacitance C0/C1 Ratio Equivalent Series Resistance
20 ppm 50 ppm 14 pf 240 Max 35 Max
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
When the PCB trace between the clock output and the load is over 1 inch, series termination should be used. To series terminate a 50 trace (a commonly used trace impedance), place a 33 resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20.
Crystal Tuning Load Capacitors
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. The procedure for determining the value of these capacitors can be found in application note MAN05.
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 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 In te grated Circuit Systems
3
525 Ra ce Street, San Jose, CA 9512 6
Revision 021804 tel (4 08) 297-1 201
w w w. i c s t . c o m
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
Supply Voltage, VDD All Inputs and Outputs Ambient Operating Temperature Storage Temperature Soldering Temperature 7V
Rating
-0.5 V to VDD+0.5 V 0 to +70C -65 to +150C 260C
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
Units
C V
Refer to page 3
Thermal Characteristics
Parameter
Thermal Resistance Junction to Ambient
Symbol
JA JA JA JC
Conditions
Still air 1 m/s air flow 3 m/s air flow
Min.
Typ.
150 140 120 40
Max. Units
C/W C/W C/W C/W
Thermal Resistance Junction to Case
MDS 3715 B In te grated Circuit Systems
4
525 Ra ce Street, San Jose, CA 9512 6
Revision 021804 tel (4 08) 297-1 201
w w w. i c s t . c o m
MK3715 LOW COST 3.3 VOLT VCXO
DC Electrical Characteristics
VDD=3.3 V 5% , Ambient temperature 0 to +70C, unless stated otherwise
Parameter
Operating Voltage Output High Voltage Output Low Voltage Output High Voltage (CMOS Level) Operating Supply Current Short Circuit Current VIN, VCXO Control Voltage
Symbol
VDD VOH VOL VOH IDD IOS VIA
Conditions
IOH = -12 mA IOL = 12 mA IOH = -4 mA No load
Min.
3.15 2.4
Typ.
Max.
3.45 0.4
Units
V V V V
VDD-0.4 6 50 0 3.3
mA mA V
AC Electrical Characteristics
VDD = 3.3 V 5%, Ambient Temperature 0 to +70 C, unless stated otherwise
Parameter
Input Crystal Frequency Input Crystal Accuracy Output Frequency Pullability Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Maximum Absolute Jitter, short term
Symbol
Conditions
Note 1
Min.
Typ.
13.500000
Max. Units
MHz ppm 1.5 1.5 ns ns % ps
FP tOR tOF tD tJ
0V< VIN < 3.3 V, Note 1 0.8 to 2.0 V 2.0 to 0.8 V At VDD/2
+100
40
50 110
60
Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3.
MDS 3715 B In te grated Circuit Systems
5
525 Ra ce Street, San Jose, CA 9512 6
Revision 021804 tel (4 08) 297-1 201
w w w. i c s t . c o m
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 Min Max Inches Min Max
Symbol
Index Area
EH
Pin 1
D
h x 45 0
A A1 B C D E e H h L a
1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 4.80 5.00 3.80 4.00 1.27 Basic 5.80 6.20 0.25 0.50 0.40 1.27 0 8
0.0532 0.0688 0.0040 0.0098 0.013 0.020 0.0075 0.0098 .1890 .1968 0.1497 0.1574 0.050 Basic 0.2284 0.2440 0.010 0.020 0.016 0.050 0 8
A Q e b c
Ordering Information
Part / Order Number
MK3715S MK3715STR
Marking
3715S 3715S
Shipping packaging
Tubes Tape and Reel
Package
8-pin SOIC 8-pin SOIC
Temperature
0 to +70 C 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 In te grated Circuit Systems
6
525 Ra ce Street, San Jose, CA 9512 6
Revision 021804 tel (4 08) 297-1 201
w w w. i c s t . c o m

▲Up To Search▲

Price & Availability of MK3715

	To Download MK3715 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .