SA7025 datasheet(2/22 Pages) PHILIPS

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Philips Semiconductors

Product specification

SA7025

1GHz low-voltage Fractional-N synthesizer

1996 Aug 6

853-1786 17157

DESCRIPTION

The SA7025 is a monolithic low power, high performance dual

frequency synthesizer fabricated in QUBiC BiCMOS technology.

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 triple modulus prescaler (divide by

64/65/72) is integrated on chip with a maximum input frequency of

1.04GHz. Programming and channel selection are realized by a

high speed 3-wire serial interface.

FEATURES

• Operation up to 1.04GHz

• 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

• Supply voltage range 2.7 to 5.5V

• Excellent input sensitivity: V

RF_IN = –20dBm

APPLICATIONS

• NADC (North American Digital Cellular)

• PDC (Personal Digital Cellular)

• Cellular radio

• Spread-spectrum receivers

PIN CONFIGURATION

VSS

DATA

CLOCK

DK Package

STROBE

TEST

VDD

PHA

VDDA

PHP

VSSA

PHI

LOCK

RFIN

VCCP

REFIN

AUXIN

SR00600

Figure 1. Pin Configuration

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

20-Pin Plastic Shrink Small Outline Package (SSOP)

–40 to +85

°C

SA7025DK

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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