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Sony Semiconductor Electronic Components Datasheet

CXA1787N Datasheet

2GHz-band PLL IC for Mobile Communications

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CXA1787N
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 DO1 DO2
Applications
1.1GHz-band mobile communication equipment
such as cellular telephones
20 pin SSOP (Plastic)
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings
Supply voltage
Vcc
Operating temperature Topr
Storage temperature Tstg
Allowable power dissipation
PD
7V
–35 to +85 °C
–65 to +150 °C
300 mW
Operating Condition
Supply voltage
Vcc 2.7 to 5.5
V
Block Diagram and Pin Configuration
OSCI 1
20 φR
NC 2
OSCO 3
Phase
Comparator
19 NC
18 φP
Vp 4
VCC 5
DO1 6
Reference Programmable
Counter 14bits
Charge
Pump 1
Charge
Pump 2
17 TEST
16 DO2
15 FC
GND 7
14 LAT
LD 8
NC 9
FIN 10
Pulse Swallow Programmable
Counter 7bits Counter 11bits
2-modulus
prescaler
1 or 1
64/65 128/129
1-bit Latch 14-bit Latch
18-bit Shift Resister
1-bit Shift
Resister
18-bit Latch
Pulse swallow programmable counter
13 DATA
12 PS
11 CK
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.
–1–
E94Z22A8Y


Sony Semiconductor Electronic Components Datasheet

CXA1787N Datasheet

2GHz-band PLL IC for Mobile Communications

No Preview Available !

Pin Description
Pin
No.
Symbol
Typical pin
voltage (DC)
1 OSCI
10 FIN
2.2V
2
9 NC
19
3 OSCO
High: 2.2V
Low: 2.0V
Equivalent circuit
VCC
1
10
GND
VCC
3
500
GND
4 VP
5 VCC
6 DO1
16 DO2
7 GND
8 LD
18 φP
20 φR
11 CK
13 DATA
14 LAT
3V
3V
High: 2.2V
Low: 0.1V
Open Low
Vp
6
16
GND
8
18
20
11
13
14
–2–
Vp
(LD is VCC)
GND
VCC
GND
CXA1787N
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.
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.
Phase comparator output.
Used for the external
charge pump.
Clock input.
Data input.
Latch input.


Part Number CXA1787N
Description 2GHz-band PLL IC for Mobile Communications
Maker Sony Corporation
Total Page 13 Pages
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