SKY74691CDMA SKYWORKS [Skyworks Solutions Inc.], SKY74691CDMA Datasheet

SKY74691CDMA

Manufacturer Part Number

SKY74691CDMA

Description

Receiver for CDMA Mobile Handset Applications

Manufacturer

SKYWORKS [Skyworks Solutions Inc.]

Datasheet

1.SKY74691CDMA.pdf (2 pages)

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

SKY74691CDMA

Manufacturer:

Skyworks

Quantity:

1 400

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PRODUCT SUMMARY

SKY74691: Receiver for CDMA Mobile Handset Applications

Applications

• Single mode CDMA handsets

Features

• Three-step gain control, cellular LNA

• External resistor to adjust LNA bias current

• Buffered LO signal for transmit upconverter

• VGA with 90 dB dynamic range

• Integrated IF VCO and tank circuit

• VCO_ON auto-tuning control

• Battery cell operation (2.7 V < VCC < 3.3 V)

• RFLGA™ (48-pin, 7 x 7 mm) Pb-free package (MSL3, 260 °C

Description

The SKY74691 is a highly integrated, super-heterodyne receiver.

This single band receiver is intended for use in Code Division

Multiple Access (CDMA) phones in cellular CDMA mode.

Except for the Surface Acoustic Wave (SAW) filters and matching

components, the device incorporates all the components required

to implement the receiver chain, from the Low-Noise Amplifier

(LNA) to the In-Phase and Quadrature (I/Q) demodulator stages.

per JEDEC-J-STD-020) with downset paddle

200029B • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • January 14, 2005

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

LNA_BIAS_RES

VCO_DEC_CAP

VCC_RF_BIAS

CELL_LNA_IN

VCO_TUNE

VCO_ON

LNA_0

LNA_1

GND

Figure 1. SKY74691 Pinout – 48-Pin RFLGA

N/C

(Top View)

After RF LNA signal amplification and filtering from the antenna,

the received signal is downconverted from RF to the Intermediate

Frequency (IF).

The LO_IN signal (pin 39) provides a Local Oscillator (LO) port for

the RF mixer. The UHF Voltage Controlled Oscillator (VCO) is

buffered and amplified internally, and provides the LO to drive the

LO port of a transmitter upconverter (such as Skyworks

CX74002).

The Variable Gain Amplifier (VGA) has a minimum dynamic range

of 90 dB with a control voltage range of 0.2 to 2.7 V. A VHF

oscillator operates with an internal tank circuit to provide LO

frequencies for the I/Q demodulator.

The noise figure, gain, and third order Input Intercept Point (IIP3)

of each stage in the receiver are optimized to meet the system

requirements for CDMA according to TIA/EIA-98-B/C. The design

employs SiGe BiCMOS technology for low cost, high performance,

and a high level of integration.

The device package and pinout for the 48-pin RF Land Grid Array

(RFLGA) are shown in Figure 1 and a block diagram of the

SKY74691 is shown in Figure 2.

Skyworks offers lead (Pb)-free “environmentally

friendly” packaging that is RoHS compliant

MODE_1

LO_OUT

LO_BUFF_VCC

N/C

CELL_IF+

CELL_IF–

N/C

VGA_VCC

N/C

CDMA_VGA_IN+

CDMA_VGA_IN–

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SKY74691CDMA Summary of contents

Page 1

PRODUCT SUMMARY SKY74691: Receiver for CDMA Mobile Handset Applications Applications • Single mode CDMA handsets Features • Three-step gain control, cellular LNA • External resistor to adjust LNA bias current • Buffered LO signal for transmit upconverter • VGA with ...

Page 2

PRODUCT SUMMARY • SKY74691 CELL_LNA_IN VCO_TUNE Ordering Information Model Name SKY74691 CDMA Receiver Copyright © 2003, 2004, 2005 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products. These materials ...

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