Data Sheet

Conexant

Doc. No. 100780D

Proprietary Information and Specifications are Subject to Change

May 24, 2000

RF212

Image-Reject Front End for Dual or Tri-Band GSM Applications

The RF212 device is available as a dual-band (EGSM900/DCS1800) front end or

as a tri-band (EGSM900/DCS1800/PCS1900) front end for Global System for

Mobile Communications (GSM) mobile telephony applications. Each device

integrates all the required front-end components after the frequency pre-select

filters. These components include the Low Noise Amplifiers (LNAs), the internal

image-reject filters, mixers, and a Local Oscillator (LO) amplifier.

The main advantage of the RF212 is its ability to provide a minimum of 35 dB of

image rejection for each band. The block diagrams of the devices are shown in

Figures 1 and 2. The device packages and pin configurations are shown in Figures

3 and 4.

Features

• Supports EGSM

• LNA and mixer for RF to IF conversion

• 12 dB or 20 dB switchable gain step

• Minimum 35 dB of image rejection

• No external post-LNA filters required

• Common Intermediate Frequency (IF) port for all

bands

• IF range from 350 MHz to 450 MHz

• High isolation LO input buffer

• Differential IF output

• High dynamic range with low current consumption

• Three-cell battery operation (2.7 to 3.6 V)

• 20-pin Exposed paddle, Thin Shrink Small Outline

Package (ETSSOP)

Applications

• Dual/tri-band digital cellular mobile telephony

(EGSM900/DCS1800, or

EGSM900/DCS1800/PCS1900)

LNA1800IN

LNA900IN

IFout

Gain

Sel

control

Band Select 1

Step

Sel

C0002

LOIN

Figure 1. RF212 Dual-Band Device Block Diagram

LNA1800IN

LNA900IN

IFout

LNA1900IN

Gain

Sel

control

Band Select 1

Step

Sel

Band Select 2

C0001

LOIN

Figure 2. RF212 Tri-Band Device Block Diagram