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SA8025A

Low-voltage 1.8GHz fractional-N synthesizer

Philips Electronics 

Philips Semiconductors

1.8GHz low-voltage Fractional-N synthesizer

Product specification

SA8025A

DESCRIPTION

The SA8025A is a monolithic low power, high performance dual

frequency synthesizer fabricated in QUBiC BiCMOS technology.

The SA8025A is an improved version of the SA8025, suitable for

narrow band systems like the Japan Personal Digital Cellular (PDC)

system. The new design improves the performance of the fractional

spur compensation circuitry. The new version is pin-for-pin

compatible with the previous version. Featuring Fractional-N

division with selectable modulo 5 or 8 implemented in the Main

synthesizer to allow the phase detector comparison frequency to be

five or eight times the channel spacing. This feature reduces the

overall division ratio yielding a lower noise floor and faster channel

switching. The phase detectors and charge pumps are designed to

achieve phase detector comparison frequencies up to 5MHz. A four

modulus prescaler (divide by 64/65/68/73) is integrated on chip with

a maximum input frequency of 1.8GHz at 3V. Programming and

channel selection are realized by a high speed 3-wire serial

interface. A 1GHz version (SA7025DK) is also available with the

same pinout.

FEATURES

• Operation up to 1.8GHz at 3V

• Fast locking by “Fractional-N” divider

• Auxiliary synthesizer

• Digital phase comparator with proportional and integral charge

pump output

• High speed serial input

• Low power consumption

• Programmable charge pump currents

PIN CONFIGURATION

DK Package

CLOCK 1

DATA 2

STROBE 3

VSS 4

RFIN 5

RFIN 6

VCCP 7

REFIN 8

RA 9

AUXIN 10

20 VDD

19 TEST

18 LOCK

17 RF

16 RN

15 VDDA

14 PHP

13 PHI

12 VSSA

11 PHA

Figure 1. Pin Configuration

SR00623

• Supply voltage range 2.7 to 5.5V

• Excellent input sensitivity: VRF_IN = –20dBm

APPLICATIONS

• PHS (Personal Handy-phone System)

• PDC (Personal Digital Cellular)

• PCS (Personal Communication Service)

• Portable communication systems

ORDERING INFORMATION

DESCRIPTION

20-Pin Plastic Shrink Small Outline Package (SSOP)

TEMPERATURE RANGE

–40 to +85°C

ORDER CODE

SA8025ADK

DWG #

SOT266-1

ABSOLUTE MAXIMUM RATINGS

SYMBOL

PARAMETER

V

VIN

TSTG

TA

Supply voltage, VDD, VDDA, VCCP

Voltage applied to any other pin

Storage temperature range

Operating ambient temperature range

NOTE: Thermal impedance (θJA) = 117°C/W. This device is ESD sensitive.

RATING

-0.3 to +6.0

-0.3 to (VDD + 0.3)

-65 to +150

-40 to +85

UNITS

V

V

°C

°C

1996 Oct 15

2

853-1785 17401

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