SA8025ADK datasheet(2/23 Pages) PHILIPS

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Philips Semiconductors

Product specification

SA8025A

1.8GHz low-voltage Fractional-N synthesizer

1996 Oct 15

853-1785 17401

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

VSS

DATA

CLOCK

DK Package

STROBE

TEST

VDD

PHA

VDDA

PHP

VSSA

PHI

LOCK

RFIN

VCCP

REFIN

AUXIN

SR00623

Figure 1. Pin Configuration

• Supply voltage range 2.7 to 5.5V

• Excellent input sensitivity: V

RF_IN = –20dBm

APPLICATIONS

• PHS (Personal Handy-phone System)

• PDC (Personal Digital Cellular)

• PCS (Personal Communication Service)

• Portable communication systems

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

20-Pin Plastic Shrink Small Outline Package (SSOP)

–40 to +85

°C

SA8025ADK

SOT266-1

ABSOLUTE MAXIMUM RATINGS

SYMBOL

PARAMETER

RATING

UNITS

Supply voltage, VDD, VDDA, VCCP

-0.3 to +6.0

VIN

Voltage applied to any other pin

-0.3 to (VDD + 0.3)

TSTG

Storage temperature range

-65 to +150

°C

Operating ambient temperature range

-40 to +85

°C

NOTE: Thermal impedance (

θJA) = 117°C/W. This device is ESD sensitive.

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