Datasheet > CX74059

CX74059

更新时间： 2024-09-28 23:44:23

品牌	Logo	应用领域
其他 - ETC		射频过程控制系统手机 PCS
页数	文件大小	规格书
2页	596K
描述
CX74059 Receiver for CDMA. AMPS. and PCS\|Handset RF ICs:CDMA / CDMA2000

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PRODUCT SUMMARY

CX74059: Rx ASIC for CDMA, PCS, and AMPS Applications

This highly integrated, super-heterodyne receiver comprises all

the critical components to implement the receiver chain:

starting from the Low-Noise Amplifier (LNA) to the In-Phase

and Quadrature (I/Q) demodulator stage, excluding the external

Surface Acoustic Wave (SAW) filters, bypass, and external

matching components. Two LNAs are in the front-end of the

receiver. The cellular LNA has three gain stages (bypass, mid,

and high), and the PCS LNA has two gain stages (bypass and

high).

APPLICATIONS

• Tri-mode CDMA handsets

FEATURES

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

• Two-step gain control PCS LNA

• Three-step gain control cellular LNA

• External pot resistor to adjust LNA bias current

• Independent cellular and PCS mixers

• Single LO input signal for cellular and PCS mixer

• Frequency divide-by-2 to switch mixer LO from PCS to cell

frequency range

• Buffered LO signal for Tx upconverter

• Single external UHF VCO is only required

• 90 dB dynamic range variable gain amplifier

• I/Q demodulator

After RF signal amplification and SAW filtering from the

antenna, the signal is mixed down from RF to the IF by the

mixer – one independent mixer for each individual band. The

CDMA cellular and PCS mixer outputs are shared in a

differential output to accommodate a single IF frequency plan,

while the AMPS mixer differential output is matched to a

differential input SAW filter, and SAW filter output is matched

single-ended into a Variable Gain Amplifier (VGA). After external

IF filtering, the signal is amplified by a VGA and fed to an I/Q

demodulator, which outputs baseband I/Q signals. The VGA

has a minimum dynamic range of 90 dB with a control voltage

range from 0.3 to 2.5 V, and it is common to all modes. A VHF

oscillator with external tank circuitry provides the Local

Oscillator (LO) frequency for the I/Q demodulator.

• 200 to 600 MHz VHF oscillator

• VCO on/off control for standby current optimization

• 6 mm x 6 mm RFLGA™ package with downset paddle

DESCRIPTION

With different frequency bands input to the mixer, the mixer LO

is tuned to have the same IF frequency output. Since IF

frequency is the same for all bands, it usually refers to a single

IF frequency plan at 183.6 MHz. One LO port for the AMPS,

CDMA, and PCS mixer is designed on the device. A divide-by-2

is used to switch the mixer LO frequency from PCS to the

cellular band. In addition, the LO oscillator signal is coupled out

and further amplified, providing an RF signal for the transmitter

upconverter LO port (LO_OUT).

The CX74059 Application-Specific Integrated Circuit (ASIC) is a

single Intermediate Frequency (IF), multi-mode, dual-band

receiver designed for use in Code Division Multiple Access

(CDMA) portable phones implementing both cellular and

Personal Communications System (PCS), as well as Advanced

Mobile Phone System (AMPS) modes.

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 AMPS and CDMA modes per TIA/EIA-

98-C. The CX74059 uses BiCMOS technology and is designed

for low cost, high performance, and a high level of integration.

A block diagram of the CX74059 is shown in Figure 1.

Skyworks Solutions, Inc. Proprietary and Confidential

103086A

[781] 376-3000 I FAX [781] 376-3100 I SALES@SKYWORKSINC.COM I WWW.SKYWORKSINC.COM

FEBRUARY 5, 2003

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与CX74059相关器件

型号	品牌	获取价格	描述	数据表
CX74061	SKYWORKS	获取价格	Rx ASIC for CDMA, AMPS, PCS, and GPS Mobile Handset Applications
CX74061-11P	SKYWORKS	获取价格	Rx ASIC for CDMA, AMPS, PCS, and GPS Mobile Handset Applications
CX74063	SKYWORKS	获取价格	RF Transceiver for Multi-Band GSM/GPRS/EDGE Applications with Integrated Crystal Oscillato
CX74063-26	SKYWORKS	获取价格	RF Transceiver for Multi-Band GSM, GPRS, and EDGE Applications with Power Ramping Controll
CX74063-34	SKYWORKS	获取价格	RF Transceiver with Power Ramping Controller and Integrated Crystal Oscillator with 13 MHz
CX74063-35	SKYWORKS	获取价格	RF Transceiver with Power Ramping Controller and Integrated Crystal Oscillator with 13 MHz
CX74063-36	SKYWORKS	获取价格	RF Transceiver with Power Ramping Controller and Integrated Crystal Oscillator with 13 MHz
CX74063-3X	SKYWORKS	获取价格	RF Transceiver with Power Ramping Controller and Integrated Crystal Oscillator with 13 MHz
CX74070	ETC	获取价格	CX74070 Receiver for PCS and GPS\|Handset RF ICs:CDMA / CDMA2000
CX74076	ETC	获取价格	CX74076 Receiver for CDMA and GPS\|Handset RF ICs:CDMA / CDMA2000

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