CF5072BA

SEIKO NPC CORPORATION —1

155MHz VCXO Module IC

OVERVIEW

The CF5072BA is 155MHz VCXO IC. It incorporates a 155.52MHz fundamental frequency oscillator circuit

and a differential LVPECL output circuit on a single chip. The oscillator circuit features characteristics opti-

mized for VCXO operation, and includes a varicap connection pin. The CF5072BA can be configured with few

external components, making them ideal as miniature VCXO modules.

FEATURES

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3.0 to 3.6V operating supply voltage range

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70MHz to 200MHz oscillator frequency range

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Differential LVPECL output

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50 ± 5% output duty

(measured at the output crossing point)

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Output enable function

High impedance output when OE = LOW

(oscillator continues running)

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−40 to 85°C operating temperature range

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Chip form (CF5072BA)

BLOCK DIAGRAM

ORDERING INFORMATION

ESD sensitive device:

The XR pin is not equipped with a protection circuit. Accordingly, its electrostatic withstand voltage is significantly lower

than that of the other pins.

ESD breakdown prevention handling precautions are strongly recommended.

XC

XIN

XR

VC

C2

C1

100pF

Differential

Converter

X'tal

VSS1

Pre-buffer

ECL

VDD2

Oscillator block equivalent circuit

VSS2

OE

OUT

OUTN

VDD1

Device

Package

CF5072BA

−1

Chip form