PRODUCT SUMMARY

CX20529: CDMA/FM/GPS Baseband Analog Processor

APPLICATIONS

•

•

•

•

•

•

•

•

•

•

•

•

Tri-band, quad-mode mobile phones (including E911

capabilities)

GPS receivers

FEATURES

Single supply voltage 2.7 to 3.3 V

Operational temperature –30

°C to +85 °C

Low power consumption in all operating modes including

sleep operation

Dual mode for CDMA and FM operation with GPS position

location capability

Receive signal path includes:

− Separate CDMA, FM, GPS filters, and A/Ds

− DC offset control loop

Receive VHF PLL synthesizer:

− 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 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, idle, and GPS modes

Pin-for-pin and functionality compatible with the CX20489

(but with GPS processing capability added)

Available in a 40-pin, 6 x 6 mm LGA package

The CX20529 is a receive-only Baseband Analog Processor

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

(CDMA), Advanced Mobile Phone System (AMPS) Frequency

Modulation (FM), and Global Positioning System (GPS)

baseband signals. The device is designed for dual-mode CDMA

and AMPS portable phones with GPS capability.

The CX20529 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, AMPS (FM), and GPS operation. For a given

operation, the CX20529 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 CX20529 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 CX20529 also integrates a

VHF PLL synthesizer to synthesize the receive Intermediate

Frequency (IF).

The CX20529 is characterized for operation from a power

supply voltage range of 2.7 V to 3.4 V, with power control logic

maintaining 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 Land Grid Array (LGA) package. A system block

diagram of the CX20529 is shown in Figure 1.

Skyworks Solutions, Inc. Proprietary and Confidential

1

103082A

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

FEBRUARY 4, 2003