STPAC01F2| Datasheet

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STPAC01F2
IPADTM RF DETECTOR FOR POWER AMPLIFIER CONTROL

MAIN PRODUCT CHARACTERISTICS The STPAC01F2 has two outputs, one for the signal detection and another one for the temperature compensation:

VDCout = 0.88 V at 0.85 GHz at 10 dBm VDCout = 1.07 V at 1.85 GHz at 10 dBm Vsupply = 5 V max Lead free package Flip-Chip (8 Bumps) Table 1: Order Code Part Number STPAC01F2

DESCRIPTION The STPAC01F2 is an integrated RF detector for the power control stage. It converts RF signal coming from the coupler into a DC signal usable by the digital stage. It is based on the use of two similar diodes, one providing the signal detection while the second one is used to provide a temperature information to thermal compensation stage. A biasing stage suppresses the detection diode drop voltage effect. Target applications are cellular phones and PDA using GSM, DCS, PCS, AMPS, TDMA, CDMA and 800 MHz to 1900 MHz frequency ranges. BENEFITS

Marking RA

Figure 1: Pin Configuration (Ball side)
3
DC out
Gnd1

2
V Temp
Gnd1 Gnd1

1

A
Gnd2 Bias

B C

The use of IPAD technology allows the RF front-end designer to save PCB area and to drastically suppress parasitic inductances.

RFin

Figure 2: Functional diagram

Coupler VBIAS RF input RF detector Low pass filter Thermal compensation STPAC01F2 GND1 GND2

VDCOut Vtemp

October 2004

REV. 1

1/7

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STPAC01F2 DATASHEET