View MK2732-06_280063.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MK2732-06
LOW PHASE NOISE VCXO AND MULTIPLIER
Description
The MK2732-06 is a low-cost, low-jitter, high-performance VCXO and PLL clock synthesizer designed to replace expensive discrete VCXOs and multipliers. The on-chip Voltage Controlled Crystal Oscillator (VCXO) accepts a 0 to 3 V input voltage to cause the output clocks to vary by 100 ppm. Using ICS's patented VCXO and analog Phase-Locked Loop (PLL) techniques, the device uses an inexpensive 10 MHz to 14 MHz pullable crystal input to produce up to three output clocks. ICS manufactures the largest variety of clocks for Set-top boxes and Communications. Consult ICS to eliminate VCXOs, crystals, oscillators andbuffers from your board.
Features
* * * * * * *
Packaged in 16-pin TSSOP Available in Pb (lead) free package For xDSL chipsets For MPEG2 decoders Replaces VCXO and multiplier Uses an inexpensive pullable crystal On-chip patented VCXO with pull range of 200 ppm (100 ppm) minimum
* VCXO tuning voltage of 0 to 3 V * Zero ppm synthesis error in all clocks * Full CMOS output swings with 25 mA output drive
capability at TTL levels
* Advanced, low-power, sub-micron CMOS process * 5 V operating voltage for core, ability to run output
clocks at 3.3 V or 5 V for easy interface.
* Available in commercial and industrial temperature
versions
Block Diagram
VDD5 VDDIO
S1, S0
2 PLL/Clock Synthesis Circuitry CLK1
VIN 10 - 14 MHz X1 pullable crystal X2 Voltage Controlled Crystal Oscillator
CLK2
REFCLK
OE (all outputs)
MDS 2732-06 F Integrated Circuit Systems
l
1
5 25 Race Street, San Jose, CA 9 512 6
l
Revision 091004 tel (40 8) 2 97-12 01
l
w w w. i c s t . c o m
MK2732-06 LOW PHASE NOISE VCXO AND MULTIPLIER
Pin Assignment
X1 VDD5 VDD5 VIN GND GND S1 OE 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 X2 REFCLK NC GND CLK2 VDDIO S0 CLK1
Clock Select Table
S1 S0 Input CLK1 CLK2 REFCLK
16-pin (173 mil) TSSOP
0 0 0 M M M 1 1 1
0 M 1 0 M 1 0 M 1
13.248 13.248 13.248 13.248 13.5 13.5 13.5 Test mode 13.5
52.992 13.248 13.248 52.992 54 54 27 -- 27
35.238 35.238 35.238 35.238 27 27 54 -- 27
OFF OFF ON ON OFF ON ON -- ON
0 = connect directly to ground M=leave unconnected (floating) 1 = connect directly to VDDIO off=output stopped low
Pin Descriptions
Pin Number 1 2,3 4 5, 6, 13 7 8 9 10 11 12 14 15 16 Pin Name X1 VDD5 VIN GND S1 OE CLK1 S0 VDDIO CLK2 NC REFCLK X2 Pin Type XI Power VI Power TI Input Output TI Power Output -- Output XO Pin Description Crystal connection. Connect to a pullable crystal of 10 to 14.318 MHz. Core VDD. Connect to +5 V. Voltage input to VCXO. Zero to 3 V signal which controls the frequency of the VCXO. Connect to ground. Select input #1. Selects the outputs per table above. Do not exceed VDDIO. Output Enable. Tri-states outputs when low. Do not exceed VDDIO. Clock output #1 per table above. Amplitude = VDDIO. Select input #0. Selects the outputs per table above. Do not exceed VDDIO. Input and output VDD. Connect to 3.3. V or 5 V. Clock amplitude matches this voltage. Clock output #2 per table above. Amplitude = VDDIO. Nothing connected internally to this pin. Buffered crystal VCXO clock. Crystal connection. Connect to a pullable crystal of 10 to 14 MHz.
Key: TI = tri-level input; VI = analog voltage input; XI, XO = crystal pins
MDS 2732-06 F Integrated Circuit Systems
l
2
525 Ra ce Stree t, Sa n Jose, CA 951 26
l
Revision 091004 te l (4 08) 297 -1 201
l
w w w. i c st . c o m
MK2732-06 LOW PHASE NOISE VCXO AND MULTIPLIER
External Component Selection
The MK2732-06 requires a minimum number of external components for proper operation.
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. To determine the need for and value of the crystal adjustment capacitors, you will need a PC board of your final layout, a frequency counter capable of about 1 ppm resolution and accuracy, two power supplies, and some samples of the crystals which you plan to use in production, along with measured initial accuracy for each crystal at the specified crystal load capacitance, CL. To determine the value of the crystal capacitors: 1. Connect VDD of the MK2732-06 to 3.3 V. Connect pin 3 of the MK2732-06 to the second power supply. Adjust the voltage on pin 3 to 0V. Measure and record the frequency of the CLK output. 2. Adjust the voltage on pin 3 to 3.3 V. Measure and record the frequency of the same output. To calculate the centering error:
Decoupling Capacitor
A decoupling capacitor of 0.01 F and 0.1 F must be connected between VDD5 and GND on pins 2, 3 and 5, 6, and VDDIO and GND on pins 11 and 13, as close to the device 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 outputs and the loads are 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.
Quartz Crystal
The MK2732-06 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 (as described in application note MAN05) must be used, and the layout guidelines discussed in the following section 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 MK2732-06 incorporates on-chip variable load capacitors that "pull" (change) the frequency of the crystal. The crystal specified for use with the MK2732-06 is designed to have zero frequency error when the total of on-chip + stray capacitance is 14 pF. The external crystal must be connected as close to the chip as possible and should be on the same side of the PCB as theMK2732-06. 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.
6 ( f 3.0V - f t arg et ) + ( f 0V - f t arg et ) Error = 10 x ------------------------------------------------------------------------------ - error xtal f t arg et
Where: ftarget = nominal crystal frequency errorxtal =actual initial accuracy (in ppm) of the crystal being measured If the centering error is less than 25 ppm, no adjustment is needed. If the centering error is more than 25 ppm negative, the PC board has excessive stray capacitance and a new PCB layout should be considered to reduce stray capacitance. (Alternately, the crystal may be re-specified to a higher load capacitance. Contact ICS for details.) If the centering
MDS 2732-06 F Integrated Circuit Systems
l
3
525 Ra ce Stree t, Sa n Jose, CA 951 26
l
Revision 091004 te l (4 08) 297 -1 201
l
w w w. i c st . c o m
MK2732-06 LOW PHASE NOISE VCXO AND MULTIPLIER
error is more than 25 ppm positive, add identical fixed centering capacitors from each crystal pin to ground. The value for each of these caps (in pF) is given by: External Capacitor = 2 x (centering error)/(trim sensitivity)
Trim sensitivity is a parameter which can be supplied by your crystal vendor. If you do not know the value, assume it is 30 ppm/pF. After any changes, repeat the measurement to verify that the remaining error is acceptably low (typically less than 25 ppm).
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK2732-06. 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 version Ambient Operating Temperature, Industrial version Storage Temperature Junction Temperature Soldering Temperature 7V
Rating
-0.5 V to VDD+0.5 V 0 to +70 C -40 to +85 C -65 to +150 C 125 C 260 C
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) Reference crystal parameters
Min.
0 +4.75
Typ.
Max.
+70 +5.25
Units
C V
Refer to MAN05
MDS 2732-06 F Integrated Circuit Systems
l
4
525 Ra ce Stree t, Sa n Jose, CA 951 26
l
Revision 091004 te l (4 08) 297 -1 201
l
w w w. i c st . c o m
MK2732-06 LOW PHASE NOISE VCXO AND MULTIPLIER
DC Electrical Characteristics
Unless noted otherwise, VDD5=5.0 V, VDDIO=3.3 V, Ambient temperature 0 to +70C
Parameter
Core Operating Voltage Operating Voltage Operating Supply Current Operating Supply Current Input High Voltage Input Low Voltage Input High Voltage Input Low Voltage Input High Voltage Input Low Voltage Output High Voltage Output Low Voltage Output High Voltage Short Circuit Current Input Capacitance Frequency Synthesis Error VIN, VCXO Control Voltage
Symbol
VDD5 VDDIO IDD IDDIO VIH VIL VIH VIL VIH VIL VOH VOL VOH
Conditions
Min.
4.75 3.13
Typ.
5.0 3.3 11 5
Max.
5.25 5.25
Units
V V mA mA V
No load No load X1 pin only X1 pin only Binary input, OE Binary input, OE Trinary inputs, S1, S0 Trinary inputs, S1, S0 IOH = -25 mA IOL = 25 mA CMOS Level, IOH = -8 mA Each output S1, S0, OE All clocks 0 VDD-0.4 2.4 VDD-0.5 2 3.5
2.5 2.5 1.5 0.8
V V V V
0.5
V V
0.4
V V
50 7 0 3
mA pF ppm V
CIN
MDS 2732-06 F Integrated Circuit Systems
l
5
525 Ra ce Stree t, Sa n Jose, CA 951 26
l
Revision 091004 te l (4 08) 297 -1 201
l
w w w. i c st . c o m
MK2732-06 LOW PHASE NOISE VCXO AND MULTIPLIER
AC Electrical Characteristics
Unless noted otherwise, VDD5=5.0 V, VDDIO=3.3 V, Ambient Temperature 0 to +70 C
Parameter
Crystal Input Frequency Output Rise Time Output Fall Time Output Clock Duty Cycle Maximum Absolute Jitter, short term Phase Noise, relative to carrier Output Pullability
Symbol
FIN tOR tOF
Conditions
0.8 V to 2.0 V 2.0 V to 0.8 V At VDDIO/2
Min.
10
Typ.
Max.
14 1.5 1.5
Units
MHz ns ns % ps dBc/Hz ppm
40 150
60
10 kHz offset 0V < VIN < 3 V 100
-115
MDS 2732-06 F Integrated Circuit Systems
l
6
525 Ra ce Stree t, Sa n Jose, CA 951 26
l
Revision 091004 te l (4 08) 297 -1 201
l
w w w. i c st . c o m
MK2732-06 LOW PHASE NOISE VCXO AND MULTIPLIER
Package Outline and Package Dimensions (16-pin TSSOP, 173 Mil. Body)
Package dimensions are kept current with JEDEC Publication No. 95
16
Millimeters Symbol
E1 INDEX AREA E
Inches Min Max
Min
Max
12 D
A2 A1
A
A A1 A2 b C D E E1 e L aaa
-1.20 0.05 0.15 0.80 1.05 0.19 0.30 0.09 0.20 4.90 5.1 6.40 BASIC 4.30 4.50 0.65 Basic 0.45 0.75 0 8 -0.10
-0.047 0.002 0.006 0.032 0.041 0.007 0.012 0.0035 0.008 0.193 0.201 0.252 BASIC 0.169 0.177 0.0256 Basic 0.018 0.030 0 8 -0.004
c
-Ce
b SEATING PLANE L
aaa C
Ordering Information
Part / Order Number
MK2732-06G MK2732-06GTR MK2732-06GI MK2732-06GITR MK2732-06GLF MK2732-06GLFTR MK2732-06GILF MK2732-06GILFTR 27326ILF 27326LF MK27326I
Marking
MK27326
Shipping Packaging
Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel
Package
16-pin TSSOP 16-pin TSSOP 16-pin TSSOP 16-pin TSSOP 16-pin TSSOP 16-pin TSSOP 16-pin TSSOP 16-pin TSSOP
Temperature
0 to 70 C 0 to 70 C -40 to 85 C -40 to 85 C 0 to 70 C 0 to 70 C -40 to 85 C -40 to 85 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 2732-06 F Integrated Circuit Systems
l
7
525 Ra ce Stree t, Sa n Jose, CA 951 26
l
Revision 091004 te l (4 08) 297 -1 201
l
w w w. i c st . c o m

▲Up To Search▲

Price & Availability of MK2732-06

	To Download MK2732-06 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .