SA900 datasheet(2/20 Pages) PHILIPS

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Philips Semiconductors

Preliminary specification

SA900

I/Q transmit modulator

DO NOT DISTRIBUTE WITHOUT ECN DATED AFTER Sept 16, 1997

1997 Sept 16

853-

DESCRIPTION

The SA900 is a monolithic high performance, multi-function transmit

modulator for use in cellular radio applications, fabricated in QUBiC

BiCMOS technology. The SA900 features both analog (AMPS)

mode and complex, I/Q digital (NADC IS–136) mode quadrature

modulation functions, a PLL synthesizer with VCO, crystal oscillator,

programmable prescalers and Gilbert cell multiplier phase detector

with programmable charge pump output. The DUALTX output can

be used in DUAL mode cellular phone applications with the AMPS

and NADC modulation being applied to the I/Q baseband inputs.

The DUALTX output also provides 6-bit power control with 40dB of

gain control in 0.63dB steps. In addition, buffered crystal oscillator

programmable prescaler outputs are provided to support system

clock reference needs. Programming of the SA900 functions are

realized by a high speed 3-wire serial interface. The SA900 can be

programmed into a sleep mode (low current mode providing crystal

oscillator and Master Clock functions), a standby mode (providing

crystal oscillator, Master Clock, System Clock 1 and Transmit LO

buffer functions), and the AMPS mode and the DUAL mode

configurations.

FEATURES

• V

CC = 4.0V

• Tx output frequency = 900MHz

• Direct modulation of RF

• DUAL mode, on-chip PA control

• I/Q modulator

• Single sideband quadrature LO generation with no external

adjustments required

• On-chip crystal oscillator with 3 buffered outputs

• AMPS/TACS compatible

• On-chip VCO

PIN CONFIGURATION

BE Package

13 14

15 16 17 18 19

21 22 23 24

GND

TXLO_2

TXLO_1

GND

Vcc

TANK_1

TANK_2

Vcc

PHSOUT

GND

XTAL_1

Vcc

GND

DUALTX

GND

Vcc

AMPSTX

GND

Vcc

GND

Vcc

GND

IPEAK

SR00636

Figure 1. Pin Configuration

• Selective power-down

– Low power AMPS/TACS mode

– Low power dual mode NADC

• 48-Pin TQFP package

APPLICATIONS

• North American Digital Cellular (TDMA IS-136)

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

48-Pin Plastic Low Profile Quad Flat Package (LQFP)

-40 to +85

°C

SA900BE

SOT313-2

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