LMV242

Dual Output, Quad-Band GSM/GPRS Power Amplifier

Controller

General Description

The LMV242 is a power amplifier (PA) controller intended for

use within an RF transmit power control loop in GSM/GPRS

mobile phones. The LMV242 supports all single-supply PA’s

including InGaP, HBT and bipolar power amplifiers. The

device operates with a single supply from 2.6V to 5.5V.

Included in the PA controller are an RF detector, a ramp filter

and two selectable output drivers that function as error am-

plifiers for two different bands. The LMV242 input interface

consists two analog and two digital inputs. The analog inputs

are the RF input, Ramp voltage input. The digital inputs

perform the function of “Band Select” and “Shutdown/

Transmit Enable” respectively. The “Band Select” function

enables either of two outputs, namely OUT1 when BS =

High, or output OUT2 when BS = Low. The output that is not

enabled is pulled low to the minimum output voltage. The

LMV242 is active in the case TX_EN = High. When TX_EN

= Low the device is in a low power consumption shutdown

mode. During shutdown both outputs will be pulled low to the

minimum output voltage. Individual PA characteristics are

accommodated by a user selectable external RC combina-

tion.

The LMV242 is offered in fully tested die form as well as in a

10-lead LLP package and is therefore especially suitable for

small footprint PA module solutions.

Features

n

Support of InGaP HBT, bipolar technology

n

Quad-band operation

n

Shutdown mode for power save in R

n

Integrated ramp filter

n

50 dB RF detector

n

GPRS compliant

n

External loop compensation option

n

Accurate temperature compensation

n

LLP package 3x3 mm and fully tested die sales

Applications

n

GSM/GPRS/TDMA/TD_SCDMA mobile phone

n

Pulse RF control

n

Wireless LAN

n

GSM/GPRS power amplifier module

n

Transmit module

Typical Application

20079501

July 2004

© 2004 National Semiconductor Corporation

DS200795

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