ICST MK2732-06G, MK2732-06GI, MK2732-06GITR, MK2732-06GTR Datasheet
PRELIMINARY INFORMATION
• Available in commercial and industrial temperature
versions
Low Phase Noise VCXO+Multiplier
MK2732-06
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/MicroClock’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 and
buffers from your board.
Features
• Packaged in 16 pin TSSOP
• For xDSL chipsets
• For MPEG 2 decoders
• Replaces a 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 3.3V or 5V for easy interface
Block Diagram
S1, S0
VIN
10-14 MHz
pullable
crystal
X1
X2
2
Voltage
Controlled
Crystal
Oscillator
PLL/Clock
Synthesis
Circuitry
VDDIOVDD5
Output
Buffer
Output
Buffer
Output
Buffer
OE (all outputs)
CLK1
CLK2
REFCLK
MDS 2732-06 C 1 Revision 120600 Printed 12/21/00
Integrated Circuit Systems • 525 Race Street • San Jose • CA •95126 •(408) 295-9800tel•www.icst.com
PRELIMINARY INFORMATION
Low Phase Noise VCXO+Multiplier
MK2732-06
Pin Assignment
Clock Select Table
X1
VDD5
VDD5
VIN
GND
GND
S1
OE
MK2732-06
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
16 pin (173 mil) TSSOP
X2
REFCLK
NC
GND
CLK2
VDDIO
S0
CLK1
S1 S0 Input CLK1 CLK2 Refclk
0 0 13.248 52.992 35.328 off
0 M 13.248 13.248 35.328 off
0 1 13.248 13.248 35.328 on
M 0 13.248 52.992 35.328 on
M M 13.5 54 27 off
M 1 13.5 54 27 on
1 0 13.5 27 54 on
1 M Test mode - - -
1 1 13.5 27 27 on
0=connect directly to GND
M=leave unconnected (floating)
1=connect directly to VDDIO
off=output stopped low.
Pin Descriptions
Number Name Type Description
1 X1 XI Crystal connection. Connect to a pullable crystal of 10-14.318 MHz.
2, 3 VDD5 P Core VDD. Connect to +5V.
4 VIN VI Voltage Input to VCXO. Zero to 3V signal which controls the frequency of the VCXO.
5, 6, 13 GND P Connect to ground.
7 S1 TI Select input #1. Selects outputs per table above. Do not exceed VDDIO.
8 OE I Output Enable. Tri-states outputs when low. Do not exceed VDDIO.
9 CLK1 O Clock Output #1 per table above. Amplitude = VDDIO.
10 S0 TI Select input #0. Selects outputs per table above. Do not exceed VDDIO.
11 VDDIO P Input and output VDD. Connect to +3.3V or +5V. Clock amplitude matches this voltage.
12 CLK2 O Clock Output #2 per table above. Amplitude = VDDIO.
14 NC - Nothing is connected internally to this pin.
15 REFCLK O Buffered crystal VCXO clock
16 X2 XO Crystal connection. Connect to a pullable crystal of 10-14 MHz.
Key: I = Input; TI = tri-level input; O = output; P = power supply connection; VI = analog voltage input;
XI, XO = crystal pins.
External Components
The MK2732-06 requires a minimum number of external components for proper operation. Decoupling
capacitors of 0.01µF should be connected between VDD5 and GND on pins 3 and 5, and VDDIO and
GND on pins 11 and 13, as close to the MK2732-06 as possible. A series termination resistor of 33 Ω may
be used for each clock output. The input crystal must be connected as close to the chip as possible. The
input crystal should be a fundamental mode, parallel resonant, pullable, AT cut. A crystal with 14 pF load
capacitance is recommended. Consult ICS/MicroClock for recommended suppliers. IMPORTANT consult the application note MAN05 for layout guidelines.
MDS 2732-06 C 2 Revision 120600 Printed 12/21/00
Integrated Circuit Systems • 525 Race Street • San Jose • CA •95126 •(408) 295-9800tel•www.icst.com
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