Technical Note

3/18

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2011.08 - Rev.B

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BU2373FV,BU2374FV

◎

BU2374FV(Ta=25℃, VDD=3.3V, unless otherwise specified.)

Parameter

Symbol

Limits

Unit

Conditions

Min.

Typ.

Max.

(VCO)

VCO_IN input impedance

Zi

-

10

-

MΩ

Consumption current

(while in normal mode)

Idd(VCO)

-

12.5

-

mA

With 50 MHz output

Consumption current

(while in standby mode)

Idd_st(VCO)

-

-

1

µA

VCO_INHIBIT=”H”,

VCOIN=”L”

Control voltage

VI

0.5

-

VDD-0.5

V

Oscillation range

frange

37

-

60

MHz

Bias resistor range

Rbias

2.0

-

3.0

KΩ

*1

Frequency sensitivity

β

1

-

23

-

MHz/V

*2

Output duty

Duty

45

50

55

%

Measured at a voltage

of 1/2 of VDD

(PFD)

Consumption current

(while in normal mode)

Idd(PFD)

-

0.5

-

mA

When 1 MHz is input to

the FIN_A and B

Consumption current

(while in standby mode)

Idd_st(PFD)

-

-

1

µA

PFD_INHIBIT=”H”,

FIN_A, B=”L”

*1 Design guaranteed figures

37 MHz to 54 MHz when Rbias =2 .0 kΩ

53 MHz to 60 MHz when Rbias = 3.0 kΩ

*2 Frequency sensitivity

{ f1 (VCOIN = 2.0V)

 f2 (VCOIN = 1.0 V) } / 1.0V

*3 If the SELECT pin is set to “H” and the output frequency is reduced to 1/4, the frequency range and the frequency sensitivity will be all reduced to 1/4.