SA1921 datasheet(2/36 Pages) PHILIPS

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Philips Semiconductors

Product specification

SA1921

Satellite and cellular dual-band RF front-end

1999 Mar 02

853–2121 20917

DESCRIPTION

The SA1921 is an integrated dual-band RF front-end that operates

at both cellular (AMPS, DAMPS, and GSM) and satellite

(1515–1600 MHz) frequencies, and is designed in a 13 GHz fT

BiCMOS process—QUBiC1. The low-band is a combined low-noise

amplifier (LNA) and mixer. The LNA has a 1.7 dB noise figure at 943

MHz with 18.3 dB of gain and an IIP3 of –5 dBm. The wide-dynamic

range mixer has a 11 dB noise figure at 943 MHz with 7.2 dB of gain

and an IIP3 of +5 dBm.

The high-band contains a receiver front-end, and a high frequency

transmit mixer intended for closed loop transmitters. One advantage

of the high-band architecture is an image-rejection mixer with over

30 dB of image rejection; thus, eliminating external filter cost while

saving board space. The system noise figure is 3.9 dB at 1550 MHz

with a power gain of 22.2 dB and an IIP3 of –11.5 dB.

FEATURES

• Low current consumption

• Outstanding low- and high-band noise figure

• Excellent gain stability versus temperature and supply

• Image reject high-band mixer with over 30 dB of rejection

• Increased low-band LNA gain compression during analog

transmission

• LO input and output buffers

• On chip logic for network selection and power down

• Very small outline package

APPLICATIONS

• 800 to 1000 MHz analog and digital receivers

• 1515 to 1600 MHz digital receivers

• Portable radios

• Digital mobile communications equipment

PIN CONFIGURATION

GND

SR01732

Rx ON

LOW BAND LO A

HIGH BAND LO B

HIGH BAND LO A

GND

LOW BAND IF B

LOW BAND IF A

HIGH BAND IF B

HIGH BAND IF A

SYN ON

HI/LO

N/C

GND

STRONG SIGNAL

GND

HIGH BAND LNA IN

LOW BAND LNA IN

GND

LOW BAND LNA OUT

N/C

V CC

GND

Figure 1.

Pin Configuration

ORDERING INFORMATION

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

SA1921

LQFP48

Plastic low profile quad flat package; 48 leads; body 7x7x1.4 mm

SOT313-2

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