Technical Note

2/18

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2011.08 - Rev.B

© 2011 ROHM Co., Ltd. All rights reserved.

BU2373FV,BU2374FV

●

Electrical characteristics

◎

BU2373FV(Ta=25℃, VDD=3.0V, 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)

-

15

-

mA

With 60 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

1.5

-

2.0

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 45 MHz when Rbias = 2.0 kΩ

50 MHz to 60 MHz when Rbias = 1.5 kΩ

*2 Frequency sensitivity

{ f1 (VCOIN=2.0V)

 f2 (VCOIN = 1.0V) } / 1.0V

*3 If the SELECT pin is set to “H” and the output frequency is reduced to 1/2, the frequency range and the frequency sensitivity will be all reduced to 1/2.

BU2373FV(Ta=25℃, VDD=5.0V, 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)

-

25

-

mA

With 60 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

43

-

100

MHz

Bias resistor range

Rbias

1.6

-

2.5

KΩ

*1

Frequency sensitivity

β

1

-

25

-

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)

-

1

-

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

43 MHz to 77 MHz when Rbias = 2.5 kΩ

75 MHz to 100 MHz when Rbias = 1.6 kΩ

*2 Frequency sensitivity

{ f1 (VCOIN = 3.5V)

 f2 (VCOIN=1.5 V) } / 2.0V

*3 If the SELECT pin is set to “H” and the output frequency is reduced to 1/2, the frequency range and the frequency sensitivity will be all reduced to 1/2.