View MK3754_991404.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MK3754
LOW COST 54 MHZ 3.3 VOLT VCXO
Description
The MK3754D and MK3754B are drop-in replacements for the MK3754S device. Compared to these earlier devices the MK3754D and MK3754B offer a wider operating frequency range and improved power supply noise rejection. The MK3754 is ICS' lowest cost, low jitter, high performance 3.3 Volt VCXO and PLL clock synthesizer designed to replace expensive 54 MHz VCXOs. The on-chip Voltage Controlled Crystal Oscillator accepts a 0 to 3.3 V input voltage to vary the output clocks by 100 ppm. Using ICS' patented VCXO and analog/digital Phase-Locked Loop (PLL) techniques, the device uses an inexpensive external 13.5 MHz pullable crystal input to produce a 54 MHz output clock. The MK3754D exhibits a moderate VCXO gain of 120ppm/V typical, when used with a high quality external pullable quartz crystal. The MK3754B offers a higher VCXO gain of 150ppm/V. The higher intrinsic VCXO gain of the MK3754B 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. Because VIN is a high impedance input, it can be driven directly from an PWM RC integrator circuit. Frequency output increases with VIN voltage input. The usable range of VIN is 0 to 3V.
Features
* MK3754D and MK3754B are drop-in upgrades to the
earlier MK3754S device
* * * * *
Packaged in 8 pin SOIC MK3754D available in Pb (lead) free package Operating voltage of 3.3 V Uses an inexpensive 13.500 MHz external crystal On-chip VCXO (patented) with pull range of 200ppm (minimum)
* VCXO turning voltage of 0 to 3.3V * 12mA output drive capability at TTL levels * Advanced, low power, sub-micron CMOS process
MK3754D is Recommended for New Designs.
Block Diagram
VDD
V IN 13.5 M H z P ullable C rystal X1
V oltage C ontrolled C rystal O scillator
X2
P LL/C lock S ynthesis C ircuitry
54 M H z
GND
MDS 3754 G 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 033005 te l (40 8) 2 97-12 01
w w w. i c st . c o m
MK3754 LOW COST 54 MHZ 3.3 VOLT VCXO
Pin Assignment
X1 VDD VIN GND 1 2 3 4 MK3754S MK3754B MK3754D 8 Pin (150 mil) SOIC 8 7 6 5 X2 GND CLK VDD
Pin Descriptions
Pin Number
1 2 3 4 5 6 7 8
Pin Name
XI VDD VIN GND VDD CLK GND X2
Pin Type
Input Power Input Power Power Power Input
Pin Description
Crystal connection. Connect to the external pullable crystal. Connect to +3.3 V (0.01uf decoupling capacitor recommended). Voltage input to VCXO -- 0 to 3.3 V analog input which controls the oscillation frequency of the VCXO. Connect to ground. Connect to +3.3 V (0.01uf decoupling capacitor recommended). Connect to ground. Crystal connection. Connect to the external pullable crystal.
Output 54 MHz clock output.
MDS 3754 G In te grated Circuit Systems
2
525 Ra ce Street, San Jose, CA 9512 6
Revision 033005 tel (4 08) 297-1 201
w w w. i c s t . c o m
MK3754 LOW COST 54 MHZ 3.3 VOLT VCXO
External Component Selection
The MK3754 requires a minimum number of external components for proper operation.
variable load capacitors that "pull" (change) the frequency of the crystal. The crystal specified for use with the MK3754 is designed to have zero frequency error when the total of on-chip + stray capacitance is 14pF. Recommended Crystal Parameters: Initial Accuracy at 25C Temperature Stability Aging Load Capacitance Shunt Capacitance, C0 C0/C1 Ratio Equivalent Series Resistance
Decoupling Capacitor
A decoupling capacitor of 0.01F must be connected between VDD (pin 2) and GND (pin 4), as close to these pins 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.
Series Termination Resistor
When the PCB trace between the clock output (CLK, pin 5) 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.
20 ppm 30 ppm 20 ppm 14 pf 7 pF Max 250 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 MK3754. 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.
Quartz Crystal
The MK3754 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 frequency of oscillation of a quartz crystal is determined by its "cut" and by the load capacitors connected to it. The MK3754 incorporates on-chip
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.
MDS 3754 G In te grated Circuit Systems
3
525 Ra ce Street, San Jose, CA 9512 6
Revision 033005 tel (4 08) 297-1 201
w w w. i c s t . c o m
MK3754 LOW COST 54 MHZ 3.3 VOLT VCXO
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK3754. 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
-0.5V to VDD+0.5V 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
MDS 3754 G In te grated Circuit Systems
4
525 Ra ce Street, San Jose, CA 9512 6
Revision 033005 tel (4 08) 297-1 201
w w w. i c s t . c o m
MK3754 LOW COST 54 MHZ 3.3 VOLT VCXO
DC Electrical Characteristics
VDD=3.3V 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 9 50 0 3.3
mA mA V
AC Electrical Characteristics
VDD = 3.3V 5%, Ambient Temperature 0 to +70 C, unless stated otherwise
Parameter
Crystal Pullability MK3754D and MK3754B MK3754S VCXO Gain MK3754D MK3754B MK3754S Output Rise Time Output Fall Time Output Clock Duty Cycle Maximum Output Jitter, short term tOR tOF tD tJ VIN = VDD/2 + 1V, Note 1 VIN = VDD/2 + 1V, Note 1 VIN = VDD/2 + 1V, Note 1 0.8 to 2.0V, CL=15pF 2.0 to 0.8V, CL=15pF Measured at 1.4V, CL=15pF CL=15pF 45 50 100 120 150 100 1.5 1.5 55 ppm/V ppm/V ppm/V ns ns % ps FP FP 0V< VIN < 3.3V, Note 1 0V< VIN < 3.3V, Note 1 + 115 + 100 ppm ppm
Symbol
Conditions
Min.
Typ.
Max. Units
Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3.
MDS 3754 G In te grated Circuit Systems
5
525 Ra ce Street, San Jose, CA 9512 6
Revision 033005 tel (4 08) 297-1 201
w w w. i c s t . c o m
MK3754 LOW COST 54 MHZ 3.3 VOLT VCXO
Package Outline and Package Dimensions (8 pin SOIC, 150 Mil. Narrow Body)
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 1.10 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
(Note 1)
Marking
MK3754D MK3754D 3754DLF 3754DLF MK3754B MK3754B MK3754S MK3754S
Shipping Packaging
Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel
Package
8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC
Temperature
0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C 0 to +70 C
MK3754D MK3754DTR MK3754DLF MK3754DLFTR MK3754B MK3754BTR MK3754S MK3754STR
Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. Note 1: MK3754D and MK3754DLF are recommended for new designs. Call factory for information on MK3754S. 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 3754 G In te grated Circuit Systems
6
525 Ra ce Street, San Jose, CA 9512 6
Revision 033005 tel (4 08) 297-1 201
w w w. i c s t . c o m

▲Up To Search▲

Price & Availability of MK3754

	To Download MK3754 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .