MK1581-01GILFTR datasheet(5/11 Pages) IDT

Part #	MK1581-01GILFTR

Description	LOW PHASE NOISE T1/E1 CLOCK GENERATOR

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Manufacturer	IDT [Integrated Device Technology]

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MK1581-01

LOW PHASE NOISE T1/E1 CLOCK GENERATOR

VCXO AND SYNTHESIZER

IDT™ / ICS™ LOW PHASE NOISE T1/E1 CLOCK GENERATOR

5

MK1581-01

REV D 073007

A “normalized” PLL loop bandwidth may be calculated as

follows:

The “normalized” bandwidth (NBW) equation above does

not take into account the effects of damping factor or the

second pole. NBW is approximately equal to the actual -3dB

bandwidth of the loop when the damping factor is about 5

and C2 is very small. In most applications, NBW is about

75% of the actual -3dB bandwidth. However, NBW does

provide a useful approximation of filter performance.

The loop damping factor is calculated as follows:

Where:

RS = Value of resistor in loop filter (Ohms)

ICP = Charge pump current (amps)

(refer to Charge Pump Current Table, below)

N = Crystal multiplier shown in the above table

CS = Value of capacitor CS in loop filter (Farads)

As a general rule, the following relationship should be

maintained between components CS and CP in the loop

filter:

Charge Pump Current Table

Special considerations must be made in choosing loop

components CS and CP.

These recommendations can be found in the design aid

tools section of www.icst.com.

Series Termination Resistor

Clock output traces over one inch should use series

termination. To series terminate a 50

Ω trace (a commonly

used trace impedance), place a 33

Ω 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

Ω. (The

optional series termination resistor is not shown in the

External Component Schematic.)

Decoupling Capacitors

As with any high performance mixed-signal IC, the

MK1581-01 must be isolated from system power supply

noise to perform optimally.

Decoupling capacitors of 0.01µF must be connected

between each VDD and the PCB ground plane. To further

guard against interfering system supply noise, the

MK1581-01 should use one common connection to the PCB

power plane as shown in the diagram on the next page. The

ferrite bead and bulk capacitor help reduce lower frequency

noise in the supply that can lead to output clock phase

modulation.

NBW

RS ICP

×

575

×

N

-----------------------------------------

=

Damping Factor

RS

625

I

CP

×

CS

×

N

-------------------------------------------

×

=

CP

CS

20

------

=

RSET

Charge Pump Current

(ICP)

1.4 M

Ω

10

µA

680 k

Ω

20

µA

540 k

Ω

25

µA

120 k

Ω

100

µA

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