sky77543 Skyworks Solutions, Inc., sky77543 Datasheet

sky77543

Manufacturer Part Number

sky77543

Description

Sky77543 Tx?rx Ipac? Fem For Dual-band Gsm / Gprs 824?849 Mhz , 1850?1910 Mhz

Manufacturer

Skyworks Solutions, Inc.

Datasheet

1.SKY77543.pdf (2 pages)

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PRODUCT SUMMARY

SKY77543 Tx–Rx iPAC

(824–849 MHz), (1850–1910 MHz)

Applications

• Dual-band cellular handsets

Features

• High efficiency

• Low transmit supply current

• Internal ICC sense resistor

• Closed loop iPAC

• 50 Ω matched Input/Output

• Tx–VCO-to-antenna and

• Tx harmonics below

• PHEMT RF switches afford

• Small outline: 7 x 6 mm

• Low profile: 0.9 mm

• Compatible with multiple

• Low APC current: 25 μA

encompassing

- Class 4 GSM850

- PCS1900

- Class 12 GPRS multi-slot

- GSM850 45.0%

- PCS1900 38.5%

- GSM850 1.26 A

- PCS1900 0.93 A

for iPAC

antenna-to-Rx-SAW filter

RF interface

high linearity, low insertion

loss, and less than 20 μA

supply current in receive

modes

logic families

–33 dBm

operation

201036A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2009

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

Description

The SKY77543 is a transmit and receive front-end module (FEM) with Integrated Power Amplifier

Control (iPAC

a low profile, compact form factor, the SKY77543 offers a complete Transmit VCO-to-Antenna and

Antenna-to-Receive SAW filter solution. The FEM also supports Class 12 General Packet Radio

Service (GPRS) multi-slot operation.

The module consists of a GSM850 PA block and a PCS1900 PA block, impedance-matching circuitry

for 50 Ω input and output impedances, Tx harmonics filtering, high linearity and low insertion loss

PHEMT RF switches, diplexer and a Power Amplifier Control (PAC) block with internal current sense

resistor. A custom BiCMOS integrated circuit provides the internal PAC function and decoder circuitry

to control the RF switches. The two Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated

onto a single Gallium Arsenide (GaAs) die. One PA block supports the GSM850 band and the other PA

block supports the PCS1900 band. Both PA blocks share common power supply pads to distribute

current. The output of each PA block and the outputs to the two receive pads are connected to the

antenna pad through PHEMT RF switches and a diplexer. The GaAs die, PHEMT die, Silicon (Si) die

and passive components are mounted on a multi-layer laminate substrate. The assembly is

encapsulated with plastic overmold.

Band selection and control of transmit and receive modes are performed using two external control

pads. Refer to the functional block diagram in

between GSM and PCS modes of operation. The transmit enable (Tx_EN) pad controls receive or

transmit mode of the respective RF switch (Tx = logic 1). Proper timing between transmit enable

(Tx_EN) and Analog Power Control (VRAMP) allows for high isolation between the antenna and Tx-VCO

while the VCO is being tuned prior to the transmit burst.

The SKY77543 is compatible with logic levels from 1.2 V to VCC for BS and Tx_EN pads, depending

on the level applied to the VLOGIC pad. This feature provides additional flexibility for the designer in

the selection of FEM interface control logic.

™

) for dual-band cellular handsets comprising 850 and PCS1900 operation. Designed in

FEM for Dual-Band GSM / GPRS

Figure 1. Functional Block Diagram

Figure 1

below. The band select pad (BS) selects

Related parts for sky77543

sky77543 Summary of contents

Page 1

... VCO is being tuned prior to the transmit burst. antenna-to-Rx-SAW filter The SKY77543 is compatible with logic levels from 1 VCC for BS and Tx_EN pads, depending RF interface on the level applied to the VLOGIC pad. This feature provides additional flexibility for the designer in • ...

Page 2

... Manufacturing Part Number SKY77543 SKY77543 ©2009, Skyworks Solutions, Inc. All Rights Reserved Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein ...

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