Datasheet > CX20489

CX20489

更新时间： 2024-09-14 23:44:23

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CX20489 CDMA and AMPS Baseband Analog Processor\|Handset RF ICs:CDMA / CDMA2000

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PRODUCT SUMMARY

CX20489: CDMA and FM Baseband Analog Processor

APPLICATIONS

DESCRIPTION

The CX20489 is a receive-only Baseband Analog Processor

(BAP) that can be used for Code Division Multiple Access

(CDMA) and Advanced Mobile Phone System (AMPS)

Frequency Modulation (FM) baseband signals. The device is

designed for dual-mode CDMA and AMPS portable phones.

• Dual-band, dual-mode mobile phones

FEATURES

• Single supply voltage from 2.7 to 3.3 V

• Operational temperature of –30 °C to +85 °C

• Low power consumption in all operating modes including

sleep operation

• Dual mode for CDMA and FM operation

• Receive signal path includes:

− Separate CDMA/FM filters and ADCs

− DC offset control loop

• Receive VHF PLL synthesizer:

The CX20489 is designed to interface between the Radio

Frequency (RF) receive section and the digital processing

circuitry of the telephone. The device includes all of the

circuitry needed to support the receive baseband signal

processing and conversions between analog and digital signals

for CDMA and AMPS (FM).

For a given operation, the CX20489 accepts analog baseband

In-phase (I) and Quadrature-phase (Q) signals, performs

channel selection low-pass filtering, and converts the analog

baseband signals into digital signals. For clock generation, the

CX20489 includes internal digital and Phase-Locked Loop

(PLL) clock synthesis for 19.2, 19.68, and 19.8 MHz system

clocks. The device also provides the capability to generate or

to accept the CHIPx8 clock to or from the Mobile Station

Modem (MSM) or equivalent baseband device. The CX20489

also integrates a VHF PLL synthesizer to synthesize the receive

Intermediate Frequency (IF).

− Programmable charge pump current

− Lock detector output

• System clock generation:

− 19.2, 19.68, and 19.8 MHz system clock support

− Accepts external CHIPx8 clock (9.8304 MHz or 8.184

MHz) and/or generates an internal CHIPx8 clock

(9.8304 MHz)

− Adjustable TCXO or TCXO/4 clock output driver levels and

power-down capability

− Provides a TCXO clock through the TCXO/4 output pin

• Mode control logic for Rx, sleep, and idle modes

• Pin-for-pin and functional compatibility with Skyworks’

CX20529 Baseband Analog Processor (but without GPS

processing capability)

The CX20489 is characterized for operation from a power

supply voltage range of 2.7 V to 3.3 V, with power control logic

to maintain a minimum power consumption. Electrical

performance parameters are designed to operate over the

–30 °C to +85 °C range. The device is available in 40-pin

6 x 6 mm RF Land Grid Array (RFLGA™) package.

• 40-pin 6 x 6 mm RFLGA™ package

A system block diagram of the CX20489 is shown in Figure 1.

Skyworks Solutions, Inc., Proprietary and Confidential

103088A

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

FEBRUARY 5, 2003

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