Sony CXA1787N Datasheet

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 DO1DO2

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

PD 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

VCC

DO1

GND

LD

NC

FIN

φR

NC

φP

TEST

D

O2

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

– 2 –

CXA1787N

Pin Description

Pin
No.

Symbol

Typical pin

voltage (DC)

Equivalent circuit Description

Reference frequency
signal input.

VCO signal input.

No connected.

Reference frequency
signal output.
Oscillator is formed by
connecting the crystal
resonator between this
pin and the OSCI pin; the
oscillator signal is used
as the reference
frequency signal.

Power supply for the
charge pump outputs
(Do1, Do2) and phase
comparator outputs
(φR, φP).

Power supply.

1

10

2

9

19

3

4

5

6

16

7

8

18

20

11

13

14

OSCI

FIN

NC

OSCO

VP

VCC
DO1

DO2

GND
LD

φP

φR

CK

DATA

LAT

Charge pump 1 output.
Charge pump 2 output.

Outputs only when the
LAT pin is High; in high
impedance when the
LAT pin is Low.

Ground.
Lock detection signal

output.

Clock input.

Data input.

Latch input.

Open Low

—

—

3V

High: 2.2V

Low: 2.0V

—

2.2V

—

—

High: 2.2V

Low: 0.1V

Phase comparator output.
Used for the external
charge pump.

VCC

GND

10

1

VCC

GND

3

500Ω

GND

6

16

Vp

Vp

GND

8
18
20

(LD is VCC)

VCC

GND

11

13

14

3V

—

– 3 –

CXA1787N

Pin
No.

Symbol

Typical pin

voltage (DC)

Equivalent circuit Description

Power saving pin.
Power saving mode
when this pin is Low.

Switching for the phases
of phase comparator
output and the output
signals of counter
(reference,
programmable) output to
the TEST pin.

The signal output which
is frequency-divided at
the counter.

12

15

PS

FC

Open High

17

TEST

High: 2.2V

Low: 2.0V

VCC

GND

12
15

17

– 4 –

CXA1787N

Item
Current consumption
Current consumption

(in power saving mode)

FIN operating frequency

FIN input level

OSCI operating frequency

OSCI input level
DO1

High output current

DO2
DO1

Low output current

DO2
DO1 High impedance

DO2 leak current
(leak current DO2 off)

φR
φP High output voltage

LD

φR
φP Low output voltage

LD

CK
DATA
LAT
PS

PS

High input voltage
High input current
Low input voltage
Low input current
Low input current

Icc
Icc

(PS)
fin

Pin

fosc

Vosc

IOH

IOL

IOZ

VOH

VOL

VIH
IOH
VIL
IIL
IIL

Vcc = Vp = 2.7V to 5.5V
Ta = –35°C to +85°C

Vcc = Vp = 2.7V to 5.5V
Ta = –35°C to +85°C

Vcc = Vp = 2.7V to 5.5V
Ta = –35°C to +85°C

Vcc = Vp = 2.7V to 5.5V
Ta = –35°C to +85°C

IL = 0.1mA

IL = 0.1mA

VIN = Vcc

VIN = GND except for PS
VIN = GND

150

–10

5

0.5

1

–1

2

Vcc × 0.7

–1

–1

–30

8.11
300

2.1

80

–15.5

12.5
500

1800

6

20

2

–1

1

500

1

Vcc × 0.3

1

mA

µA

MHz

dBm

MHz

Vpp

mA

mA

µA

V

mV

V

µA

V
µA
µA

Symbol Conditions Min. Typ. Max. Unit

Electrical Characteristics

(Vcc = Vp = 3V, Ta = 25°C, refer to the Electrical Characteristics Measurement Circuit)