SA910 datasheet(2/13 Pages) PHILIPS

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Philips Semiconductors

Product specification

SA910

Variable gain RF predriver amplifier

1997 Aug 12

853–2021 18269

DESCRIPTION

The SA910 is a variable gain predriver amplifier designed for

handheld analog cellular telephones. When used with a UHF power

transistor, it forms a cost-effective, low-profile, surface mount power

amplifier solution (1.2W maximum PAE

> 50%). The SA910

integrates power detection and control circuitry that is stabilized over

temperature and voltage. In power down mode, the SA910 draws

less than 10

µA of current. The SA910 is fabricated using Philips

QUBiC BiCMOS process.

FEATURES

• MMIC BiCMOS predriver amplifier

• Low voltage 2.7 to 5.5V single supply operation

• 820 to 905MHz bandwidth

• High power gain >20dB

• High power output >23dBm (typical) @ 3V

• Efficiency = 35% (typical)

• Wide gain control range: >32dB

• Few external components required

• Integrated power detector and comparison gain control circuitry

• 50Ω input, open-collector output

• SSOP-20 package

• Integrated regulator with offset adjustment for biasing an external

output stage

PIN CONFIGURATION

VCC1

VREF

RFIN

GND

BIASOUT

GND

OUTLPF

PWRUP

OFFSET

GND

SR01067

VCC BIAS

RFOUT2

RFOUT1

PSENSE

APPLICATIONS

• 900MHz analog cellular

• Handheld transmitting equipment in the 820 to 905MHz frequency

range

• Cordless phone

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