SA1620 datasheet(2/26 Pages) PHILIPS

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Philips Semiconductors

Product specification

SA1620

Low voltage GSM front-end transceiver

1997 May 22

853-1784 18066

DESCRIPTION

The SA1620 is a combined receive (Rx) and transmit (Tx) front-end

for GSM cellular telephones. The receive path contains two low

noise amplifiers (LNA1 and LNA2) with four switchable attenuation

steps. A Gilbert Cell mixer in the receive path down-converts the

RF signal to a first IF of 70 to 500 MHz. A second Gilbert Cell in the

transmit path transposes a GMSK or phase modulated IF to RF by

image reject mixing and has a fixed IF of 400 MHz. A buffered LO

signal is fed to Rx and Tx mixers. Rx or Tx path or the entire circuit

may be powered-down.

FEATURES

• Excellent noise figure: <2dB for the LNAs at 950MHz

• LNAs matched to 50Ω with external matching components

• LNAs with gain control, 59dB dynamic range in four discrete steps

• LNA gain stability ±0.5dB within -40 to 85°C

• Feedthrough attenuation LNA1 to Rx mixer ≥ 35dB

• Tx power adjustable from -3 to +12dBm by external resistor

• Direct supply: 2.7V to 5.5V

• Battery supply voltage V

BATT = 3.3V to 7.5V or direct supply

• Two DC regulators programmable for 3.0V, 3.4V, 3.7V or 5.1V

• Low current consumption: 28mA for Rx or 59mA for Tx

• Fully compatible with SA1638 GSM IF Digital I/Q circuit

APPLICATIONS

• 900MHz front end for GSM hand-held units

• Portable radio, TDMA systems

PIN CONFIGURATION

LQFP Package

VBATT

PON

GNDREG1

VREG1

VREGF2

VREG2

GNDREG2

CON1

LO INX

LO IN

VCCL2

IN2

GNDL2

GNDL2A

OUT2

INM

INMX

COMP2

48–PIN LQFP

13 14

15 16 17 18 19

21 22 23 24

COMP1

VCCBM

CON2

GNDTx2

SR00127

Figure 1.

Pin Configuration

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

48-Pin Thin Quad Flat Pack (TQFP)

-40 to +85

°C

SA1620BE

SOT313-2

RECOMMENDED OPERATING CONDITIONS

SYMBOL

PARAMETER

RATING

UNITS

VCCXX

Supply voltages

2.7 to 5.5

VBATT

Battery voltage

3.3 to 7.5

Operating ambient temperature range

-40 to +85

°C

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