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MK3711
LOW COST 8 - 16 MHZ 3.3 VOLT VCXO
Description
The MK3711D is a drop-in replacement for the original MK3711S device. Compared to these earlier devices, the MK3711D offers a wider operating frequency range and improved power supply noise rejection. Used in conjunction with an external pullable quartz crystal, this monolithic integrated circuit replaces more costly hybrid (canned) VCXO devices. The MK3711 is designed primarily for data and clock recovery applications within end products such as ADSL modems, set-top box receivers, and telecom systems. The MK3711D exhibits a moderate VCXO gain of 120ppm/V typical, when used with a high quality external pullable quartz crystal. The frequency of the on-chip VCXO is adjusted by an external control voltage input into pin VIN. Since 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
* MK3711D is a drop-in replacement for the earlier
MK3711S device
* MK3711D offers an 8-16 MHz output frequency
range and improved power supply noise rejection
* Uses an inexpensive 8 to 16 MHz external crystal * On-chip VCXO with guaranteed pull range of 115
ppm minimum
* * * *
VCXO tuning voltage 0 to 3.3 V Packaged in 8 pin SOIC (150 mil wide) Available in Pb (lead) free package Industrial temperature range available
MK3711B is Obsolete
Block Diagram
VDD VIN
8-16 MHz Pullable Crystal
X1
X2
Voltage Controlled Crystal Oscillator
8-16 MHz
GND
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MK3711 LOW COST 8 - 16 MHZ 3.3 VOLT VCXO
Pin Assignment
X1 VDD VI N GND 1 2 3 4 MK 3 7 1 1 D 8 P i n ( 1 5 0 mi l ) S OI C 8 7 6 5 X2 DC REF DC
Pin Descriptions
Pin Number
1 2 3 4 5 6 7 8
Pin Name
XI VDD VIN GND DC REF DC X2
Pin Type
Input Power Input Power -- Output -- 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. Do not connect anything to this pin. VCXO CMOS level clock output matches the nominal frequency of the crystal. Do not connect anything to this pin. Crystal connection. Connect to the external pullable crystal.
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MK3711 LOW COST 8 - 16 MHZ 3.3 VOLT VCXO
External Component Selection
The MK3711 requires a minimum number of external components for proper operation.
For crystal frequencies between 13.5 MHz and 16 MHz, the nominal crystal load capacitance specification should be 14 pF. Contact ICS MicroClock applications regarding the use of a crystal below 13.5 MHz. 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 MK3711. There should be no vias 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.
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.
Crystal Tuning Load Capacitors
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. The crystal traces should include pads for small fixed capacitors, one between X1 and ground, and another between X2 and ground. 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 MK3711 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 MK3711 incorporates on-chip variable load capacitors that "pull" (change) the frequency of the crystal. The crystal specified for use with the MK3711 is designed to have zero frequency error when the total of on-chip + stray capacitance is 14 pF. Recommended Crystal Parameters: Initial Accuracy at 25C Temperature Stability Aging Load Capacitance Shunt Capacitance, C0 C0/C1 Ratio Equivalent Series Resistance
20 ppm 30 ppm 20 ppm 14 pf 7 pF Max 250 Max 35 Max
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Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK3711. 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 (commercial) Ambient Operating Temperature (industrial) Storage Temperature Soldering Temperature 7V
Rating
-0.5 V to VDD+0.5 V 0 to +70C -40 to +85C -65 to +150C 260C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature (commercial) Ambient Operating Temperature (industrial) Power Supply Voltage (measured in respect to GND) Reference crystal parameters
Min.
0 -40 +3.15
Typ.
Max.
+70 +85 +3.45
Units
C C V
Refer to page 3
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DC Electrical Characteristics
VDD=3.3 V 5% , Ambient temperature -40 to +85C, 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 Output = 12 MHz, no load
Min.
3.15 2.4
Typ.
Max.
3.45 0.4
Units
V V V V
VDD-0.4 7 50 0 3.3
mA mA V
AC Electrical Characteristics
VDD = 3.3 V 5%, Ambient Temperature -40 to +85 C, unless stated otherwise
Parameter
Output Frequency Crystal Pullability, Note 2 VCXO Gain MK3711D, Note 3 Output Rise Time Output Fall Time Output Clock Duty Cycle Maximum Output Jitter, short term
Symbol
FO FP
Conditions
0V< VIN < 3.3 V, Note 1 VIN = VDD/2 1 V, Note 1
Min.
8 115
Typ.
Max. Units
16 MHz ppm
120 1.5 1.5 40 50 100 60
ppm/V ns ns % ps
tOR tOF tD tJ
0.8 to 2.0 V, CL=15 pF 2.0 to 0.8 V, CL=15 pF Measured at 1.4 V, CL=15 pF CL=15 pF
Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3. Note 2: Original MK3711S and MK3711A provided 100 ppm crystal pullability. Note 3: Original MK3711S and MK3711A provided 100 and 170 ppm/V respectively.
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Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters
8
Inches Min Max
Symbol
Min
Max
E INDEX AREA
H
12 D
A A1 B C D E e H h L
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
.0532 .0688 .0040 .0098 .013 .020 .0075 .0098 .1890 .1968 .1497 .1574 0.050 BASIC .2284 .2440 .010 .020 .016 .050 0 8
*For reference only. Controlling dimensions in mm.
A A1 h x 45 C
-Ce
B SEATING PLANE L
.10 (.004)
C
Ordering Information
Part / Order Number
MK3711DM MK3711DMTR MK3711DMLF MK3711DMLFTR MK3711DMI MK3711DMITR MK3711DMILF MK3711DMILFTR
Marking
MK3711DM MK3711DM 3711DMLF 3711DMLF 3711DMI 3711DMI 3711DMIL 3711DMIL
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 -40 to +85 C -40 to +85 C -40 to +85 C -40 to +85 C
Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. 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.
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