Datasheet > CX74040

CX74040

更新时间： 2022-01-18 22:23:00

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其他 - ETC		射频手机
页数	文件大小	规格书
2页	603K
描述
Transmitter for WCDMA and UMTS Applications\|Handset RF ICs:WCDMA

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CX74040 数据手册

PRODUCT SUMMARY

CX74040: Tx ASIC for WCDMA and UMTS Applications

The CX74040 Application-Specific Integrated Circuit (ASIC) is a

APPLICATIONS

single supply, monolithic integrated circuit that incorporates all

the active functional blocks required for a transmitter. It is

designed for use in Wideband Code Division Multiple Access

(WCDMA) and Universal Mobile Telecommunication System

(UMTS) voice/data applications in the IMT-2000 frequency

band.

• WCDMA

FEATURES

• Single battery cell operation (2.7 V < VCC < 3.3 V)

• Low power consumption in all operating modes

• Transmit power control with 90 dB dynamic range

• Variable gain RF block to meet Signal-to-Noise Ratio (SNR)

• 100 to 1200 MHz oscillator (external tank)

• VCO_ON feature to increase the talk time of the radio

• Two separate Phase Lock Loop (PLL) synthesizers: dual-

loop multiband operation, power-save mode for both

standby and lower frequency of operation

The highly integrated super-heterodyne transmitter comprises

all the critical components to implement the transmitter chain:

an In-Phase and Quadrature (I/Q) modulator that accepts the

analog I and Q outputs from the baseband processor and

converts them to Intermediate Frequency (IF) signals; a Voltage

Controlled Oscillator (VCO) and VHF synthesizer to generate the

Local Oscillator (LO) signal for the quadrature demodulators; a

UHF synthesizer to control the UHF oscillator; and a Variable

Gain Amplifier (VGA), which is required in CDMA systems to

provide a linear variable output power at the antenna.

• Fully programmable PLL dividers, selectable charge-pump

currents for multi-VCO applications controlled via the Serial

Bus Interface

The output of the VGA is fed to the upconverter with a provision

of Rx band filtering using a discrete IF filter. The output of the

upconverter is fed to the power amplifier pre-driver and filtered

using a bandpass filter. The output is sent to an external power

amplifier to obtain the rated final output power at the antenna.

• 40-pin, 6 mm x 6 mm RFLGA package with downset paddle

The device package and pinout for the 40-pin RF Land Grid

Array (RFLGA™) device is shown in Figure 1. A block diagram

of the CX74040 is shown in Figure 2.

VCC_CLK

VCC_VHF

VGA_OUT+

VGA_OUT–

VCC_IF

VHF_CP

REF

POT_MIX

LD_OUT

DRIVER_ON

IF_IN+

UHF_CP

VCC_UHF_SYNTH

UHF_LO_SYNTH

POT_DRV

UHF_LO

IF_IN–

POT_UHF_LO

VCC_MIXER2

VCC_MIXER1

VCC_BIAS_MIX

VCC_UHF

Figure 1. CX74040 Pinout – 40-Pin LGA (Top View)

Skyworks Solutions, Inc. Proprietary and Confidential

103117A

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

APRIL 25 2003

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