2GHz-band PLL IC for Mobile Communications

Descriptions

The CXA1787N is a frequency synthesizer PLL IC

developed for use in mobile communication systems.

This IC has low current consumption, small package

and is suitable for portable sets of cellular telephone

and others.

Features

• Low current consumption

Icc = 8.0mA (typ.)

0.3mA (typ.) in power saving mode

• Maximum operating frequency

1.8GHz guaranteed

• Operating supply voltage range

2.7 to 5.5V

• Ultra small 20-pin SSOP package

• Two types of phase comparator output:

For external charge pump

φR

φP

Two internal charge pumps

Applications

1.1GHz-band mobile communication equipment

such as cellular telephones

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings

• Supply voltage

Vcc

7

V

• Operating temperature Topr

–35 to +85

°C

• Storage temperature

Tstg

–65 to +150

°C

• Allowable power dissipation

300

mW

Operating Condition

Supply voltage

Vcc

2.7 to 5.5

V

– 1 –

E94Z22A8Y

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by

any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the

operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

CXA1787N

Reference Programmable

Counter 14bits

Charge

Pump 2

Phase

Comparator

OSCI

NC

OSCO

Vp

GND

LD

NC

FIN

φR

NC

φP

TEST

FC

LAT

DATA

PS

CK

2

5

7

8

9

12

15

17

18

19

1

Charge

Pump 1

Pulse Swallow

Counter 7bits

Programmable

Counter 11bits

2-modulus

prescaler

64/65

1

128/129

1

or

14-bit Latch

1-bit Latch

1-bit Shift

Resister

18-bit Latch

4

6

10

11

13

14

Pulse swallow programmable counter

20

16

18-bit Shift Resister

3

20 pin SSOP (Plastic)

Block Diagram and Pin Configuration