sky77554-21 Skyworks Solutions, Inc., sky77554-21 Datasheet

sky77554-21

Manufacturer Part Number

sky77554-21

Description

Manufacturer

Skyworks Solutions, Inc.

Datasheet

1.SKY77554-21.pdf (2 pages)

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Bonase Electronics (HK) Co., Limited

Part Number:

SKY77554-21

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SKYWORKS

Quantity:

12 473

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

SKY77554-21

Manufacturer:

SKYWORKS

Quantity:

12 473

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PRODUCT SUMMARY

SKY77554-21 Tx Quad-Band / Rx Dual-Band BiFET iPAC

for GSM / GPRS (824-915 MHz and 1710-1910 MHz)

w/ Dual WCDMA TRx Switch

Applications

• Dual-band cellular handsets

Features

• High efficiency

• Low transmit supply current

• Internal ICC sense resistor for

• Closed loop iPAC

• 50 Ω matched Input/Output

• Tx–VCO-to-antenna and

• RF switch affords high

• Small, low profile package

encompassing

- Class 4 GSM850/900

- DCS1800/PCS1900

- Class 12 GPRS multi-slot

- 42% (GSM850)

- 42% (GSM900)

- 42% (DCS1800)

- 41% (PCS1900)

- 1.36 A (GSM850)

- 1.36 A (GSM900)

- 0.86 A (DCS1800/PCS1900)

iPAC

antenna-to-Rx-SAW filter RF

interface

linearity, low insertion loss,

and 0 V DC on Rx ports

- 6 mm x 6 mm x 0.9 mm

- 28-pad configuration

operation

201482A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • February 8, 2011

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

Description

SKY77554-21 is a transmit and receive Front-End Module (FEM) with Integrated Power Amplifier

Control (iPAC

operation. Designed in a low profile, compact form factor, the SKY77554-21 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 GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedance-

matching circuitry for 50 ohm input and output impedances, Tx harmonics filtering, high linearity /

low insertion loss RF switch, and a Power Amplifier Control (PAC) block with internal current sense

resistor. Two Heterojunction Bipolar Transistor (HBT) PA blocks, a BiFET PAC, and switch control

circuit are fabricated onto a single Gallium Arsenide (GaAs) die. One PA block supports the

GSM850/900 bands and the other PA block supports the DCS1800/PCS1900 bands. 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 an RF switch. The

GaAs die, Switch 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 are performed using four external control pads.

Refer to the block diagram in Figure 1 below. The band select pad, BS, selects GSM850, GSM900,

DCS, and PCS modes of operation.

Transmit enable TxEN controls receive or transmit mode of the RF switch (Tx = logic 1) and sets

the turn-on threshold for VRAMP (VRAMP threshold = V(TxEN) ÷ 7). Proper timing between transmit

enable TxEN 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 SKY77554-21 is compatible with logic levels from 1.2 V to 2.9 V for BS, TxEN, MODE, and

VSW_EN pads.

™

) for Dual-band cellular handsets comprising GSM850/900 and DCS1800/PCS1900

Figure 1. SKY77554-21 Functional Block Diagram

™

FEM

Related parts for sky77554-21

sky77554-21 Summary of contents

Page 1

... TxEN 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. • 50 Ω matched Input/Output The SKY77554-21 is compatible with logic levels from 1 2.9 V for BS, TxEN, MODE, and • Tx–VCO-to-antenna and VSW_EN pads. ...

Page 2

... Model Number Part Number SKY77554 SKY77554-21 ©2011, 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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