mk3732-10 Integrated Device Technology, mk3732-10 Datasheet - Page 3

• Manufacturer Part Number: mk3732-10
• Description: Vcxo And Multiplier
• Manufacturer: Integrated Device Technology

Pin Descriptions
Pin Descriptions
The MK3732-10 requires a minimum number of external
components for proper operation.
Decoupling Capacitors
Decoupling capacitors of 0.01µF should be connected
between VDD and GND on pins 2 and 5 and pins 3 and 6,
as close to the MK3732-10 as possible. For optimum device
performance, the decoupling capacitors 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 traces between the clock outputs (CLK, pin
5) and the loads are over 1 inch, series termination should
be used. To series terminate a 50Ω trace (a commonly used
trace impedance) place a 33Ω resistor in series with the
clock line, as close to the clock output pin as possible. The
nominal impedance of the clock output is 20Ω.
Quartz Crystal
The MK3732-10 VCXO function consists of the external
IDT™ / ICS™ VCXO AND MULTIPLIER
Number
MK3732-10
VCXO AND MULTIPLIER
2 - 3
5 - 6
Pin
10
11
12
13
14
15
16
1
4
7
8
9
PDCLK3
Name
REF/2
CLK3
GND
VDD
REF
Pin
VIN
OE
S3
S2
S0
S1
X2
XI
Output PLL output clock that is either a multiple of the input or an audio clock. See table
Output Buffered VCXO reference clock output. Matches crystal frequency.
Output Reference clock output divided by two.
Power
Power
Type
Input
Input
Input
Input
Input
Input
Input
Pin
XO
XI
Crystal connection. Connect to a pullable of 16 to 28 MHz cyrstal.
Voltage input to VCXO. Zero to 3.3V signal which controls the VCXO frequency.
Select input #3. Selects outputs per table above. Internal pull-up resistor.
Select input #2. Selects outputs per table above. Internal pull-up resistor.
Power down for CLK3.
Select input #0. Selects outputs per table above. Internal pull-up resistor.
above.
Select input #1. Selects outputs per table above. Internal pull-up resistor.
Output enable. Tri-states outputs when low. Internal pull-up resistor.
Crystal connection. Connect to a pullable 16 to 28 MHz crystal.
Connect to +3.3 V.
Connect to ground.
3
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 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
MK3732-10 incorporates on-chip variable load capacitors
that “pull” (change) the frequency of the crystal. The crystal
specified for use with the MK3732-10 is designed to have
zero frequency error when the total of on-chip + stray
capacitance is 14pF.
Recommended Crystal Parameters:
Pin Description
Initial Accuracy at 25
Temperature Stability
°
C
VCXO AND MULTIPLIER
MK3732-10
±20 ppm
±30 ppm
REV C 050203