NPC CF5008A1-2 Datasheet

CF5008A1

NIPPON PRECISION CIRCUITS INC.

VCXO Module IC

OVERVIEW

The CF5008A1 is a VCXO module IC that employs a circuit structure with low parasitic capacitance effects
and a wide frequency range. Built-in components mean that few external components are required to construct
a VCXO.

FEATURES

■

Up to 30 MHz operation

■

Inverter amplifier feedback resistor built-in

■

8 mA (V

■

2.7 to 5.5 V supply voltage

■

Circuit structure with low parasitic capacitance effects

= 5 V), 4 mA (V

DD

= 3 V) drive capability

DD

• Direct connection to varicap diodes and crystal

■

Few external components required to form a VCXO

■

Amplitude limiting resistor Rd built-in

■

Chip form (CF5008A1)

SERIES CONFIGURATION

Version Output frequency Input level Output duty level Standby output state

CF5008A1 f

O

ORDERING INFORMATION

De vice Pack ag e

CF5008A1–2 Chip form

CMOS CMOS High impedance

NIPPON PRECISION CIRCUITS—1

×

PAD LAYOUT

(Unit : µ m)

CF5008A1

UNUSED2

UNUSED1

XT2

VDD

INH

(1400,1300)

1234 5

(0,0)

78

XTVSS

Chip size: 1.40
Chip thickness: 220 ± 30 µm
Chip base: V

DD

level

6
Q

1.30 mm

PAD DIMENSIONS

Number Name I/O Description

1 UNUSED1 – Not used. 153 1112
2 UNUSED2 – Not used. 425 1112
3XT2 O Oscillator output pin 66 0 1112
4 VD D – Supply voltage 865 1112

5 INH
6 Q O Output pin 1245 152

7 X T I Oscillator input pin 34 6 18 8
8 VSS – Ground 155 188

Output-control input pin. Q signal output enabled when HIGH

I

or open. High-impedance output when LOW.

Pad dimensions [µm]

XY

1202 1112

NIPPON PRECISION CIRCUITS—2

Ω

Ω

Ω

Ω

Ω

BLOCK DIAGRAM

CF5008A1

Rf

XT

XT2

CG

RB2

CD Rd

CC

Control Circuits

VDD

VSS

Q

Rp

INH

OSCILLATOR ELEMENT CONSTANTS (typical values)

R

B1

CF5008A1 100k

R

50k

B2

R

450

d

R

f

150k

R

100k

p

C

G

20pF 10pF 70pF

C

D

C

C

NIPPON PRECISION CIRCUITS—3