PA2423U-R datasheet(9/10 Pages) SIGE

9 / 10 page

PA2423U

RangeCharger

TM 2.4 GHz Bluetoothtm Power Amplifier IC

Preliminary

131-DST-01 Rev 1.1 Apr-18-2006

Confidential

9 of 10

QA041806

Applications Information

For test and design purposes, SiGe Semiconductor offers an evaluation board for the PA2423U. The order part

number for the evaluation board is PA2423U-EV1. The evaluation board is intended to simplify the testing with

respect to RF performance of this power amplifier.

The application note, 131-DST-02 provides the supporting information for using the evaluation board. It contains

information on the schematic, bill of materials and recommended layout for the power amplifier and the input and

output matching networks. To assist in the design process, this layout is available, upon request, in gerber file format.

Using VRAMP

VRAMP is a digital pin used to power-up and power-down the PA2423U in time division duplex systems such as

Bluetooth

TM 1.1. During receive mode, VRAMP voltage is pulled down, PA2423U acts as a 35 dB isolation block

between the radio and the antenna while consuming a modest 1 µA. In transmit mode, VRAMP voltage is pulled to VCC

and PA2423U offers 19 dB to 21 dB of large signal gain.

Using VCTL

VCTL is an analog pin that is designed to control the gain of PA2423U. Applying a voltage between 0 V and VCC will

adjust the gain between -15 dB and 21 dB. Used in combination with a variable drive level to PA2423U, the VCTL

function can greatly optimize the PAE of the system at all four Bluetooth

TM transmitted power levels.

PA2423U-R Fiches technique(PDF) 9 Page - SiGe Semiconductor, Inc.