Datasheet > CX20470

CX20470

更新时间： 2024-09-15 03:27:39

品牌	Logo	应用领域
思佳讯 - SKYWORKS		/
页数	文件大小	规格书
18页	212K
描述
CDMA Baseband Analog Processor

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CX20470 数据手册

CX20470

CDMA Baseband Analog Processor

The CX20470 is a dual-mode Baseband Analog Processor (BAP) for use in Code

Division Multiple Access (CDMA) and Frequency Modulated (FM) portable

telephones. The device is designed to interface between the RF section and the

digital processing circuitry of the telephone. The CX20470 CDMA BAP includes all

of the circuitry needed to support baseband signal processing and conversions

between analog and digital signals in a dual mode CDMA and FM phone.

Distinguishing Features

•

Dual mode for CDMA and FM operation.

Receive signal path includes:

− Separate CDMA, and FM filters and ADCs

− Offset control loop

•

Transmit signal path includes:

− Configurable input interface to either digital or

analog I/Q signals from the baseband modem

− Selectable conversion of digital I-Q data to analog

signals

− Separate CDMA filters and FM filters

Two VHF PLL synthesizers:

The receive section accepts analog baseband in-phase (I) and quadrature-phase

(Q) signals, performs channel selection lowpass filtering, and converts the analog

baseband signals into digital signals. The transmit section function provides the

reverse conversions for digital input signals. In addition, the transmit section also

accepts differential analog I and Q signals from baseband.

•

− Programmable charge pump current

− Lock detector output

The CX20470 CDMA BAP also includes digital and Phase Locked Loop (PLL) clock

synthesis for 19.2 MHz, 19.68 MHz, and 19.8 MHz system clocks, general purpose

Analog-to-Digital (A/D) conversions for battery and signal strength monitoring, and

two PLL synthesizers

− Operate in concert with CDMA mode operation

System clock generation and support includes:

− 19.2/19/68/19.8 MHz system clock support

− External CHIPx8 clocks (input to BAP)

− TCXO/4 and CHIPx8 clocks powerdown capability

Audio CODEC includes:

The CX20470 CDMA BAP integrates an audio Coder/Decoder (CODEC) that

provides signal translation between an analog voice band signal and a Pulse Code

Modulation (PCM) digital signal. The CODEC is designed to perform the transmit

encoding A/D conversion, together with transmit and receive filtering, for voice-

band communication systems. The CODEC’s audio interface consists of 3

microphone inputs, 3 audio speaker outputs, and DTMF/tone(s)/ring/side tone

generation. The CODEC operation and configuration registers can be programmed

by a microcontroller via an Inter-Integrated Circuit (I²C) compatible or 3-wire bus

interface at any time. The CODEC also integrates the microphone amplifier and

speaker post amplifier on-chip. The post amplifier is capable of driving a 32 Ω load

directly.

− 14-bit linear CODEC with on-chip filters meet ITU-T

G.712 requirements

− Switchable 3 microphone inputs with pre-amplifier

gain control from –4 to 40 dB in 2 dB steps

− Switchable 3 speaker outputs with programmable

post-amplifiers from 0 to –30 dB in 2 dB steps, and

capable of driving 32 Ω load directly.

− Programmable frequency and gain for

DTMF/Tone(s)/Ring/Sidetone generation

− Separate ringer output with gain control

8-bit general purpose ADC with 7 input channels

Independent mode and operation controls for BAP

and CODEC functions

•

The device is available in 100-pin µBGA and 56-pin Land Grid Array (LGA)

packages:

•

Low power consumption in all operation modes

Baseband modem interface compatibility includes:

− MSM2300/MSM3000

•

100-pin µBGA – CDMA, FM, dual VHF synthesizers, 7-input monitor ADC,

audio CODEC

56-pin LGA – CDMA, single VHF synthesizer, 2-input monitor ADC.

− MSM3100

•

Single supply voltage from 2.7 V to 3.6 V

Operating temperature of –40 °C to +85

Package options include:

The device package pinout for each of these are shown in Figures 1 and 2. A

general block diagram of the CX20470 BAP is shown in Figure 3.

− 100-pin µBGA

− 56-pin LGA

Applications

•

Cellular and Advanced Mobile Phone System (AMPS)

band phones

•

Dual band PCS/cellular CDMA

Dual mode/dual band

Data Sheet

Skyworks – Preliminary

Proprietary Information and Specifications are Subject to Change

Order No. 101106A

August 24, 2000

12 3 4 5 6 7...18

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型号	品牌	获取价格	描述	数据表
CX-2-0470MHZ(A/10PPM/50PPM/C)	STATEK	获取价格	Parallel - Fundamental Quartz Crystal, 70MHz Nom, HERMETIC SEALED, MINIATURE, CERAMIC PACK
CX-2-0470MHZ(A/20PPM/50PPM/C)	STATEK	获取价格	Parallel - Fundamental Quartz Crystal, 70MHz Nom, HERMETIC SEALED, MINIATURE, CERAMIC PACK
CX-2-0470MHZ(B/10PPM/50PPM/I)	STATEK	获取价格	Parallel - Fundamental Quartz Crystal, 70MHz Nom, HERMETIC SEALED, MINIATURE, CERAMIC PACK
CX-2-0470MHZ(B/20PPM/50PPM/I)	STATEK	获取价格	Parallel - Fundamental Quartz Crystal, 70MHz Nom, HERMETIC SEALED, MINIATURE, CERAMIC PACK
CX-2-0470MHZ(B/30PPM/50PPM/I)	STATEK	获取价格	Parallel - Fundamental Quartz Crystal, 70MHz Nom, HERMETIC SEALED, MINIATURE, CERAMIC PACK
CX-2-0470MHZ(C/20PPM/50PPM/M)	STATEK	获取价格	Parallel - Fundamental Quartz Crystal, 70MHz Nom, HERMETIC SEALED, MINIATURE, CERAMIC PACK
CX-2-04760.0KHZ(B/C)	STATEK	获取价格	Parallel - Fundamental Quartz Crystal, 0.76MHz Nom, HERMETIC SEALED, MINIATURE, CERAMIC PA
CX-2-04760.0KHZ(C/M)	STATEK	获取价格	Parallel - Fundamental Quartz Crystal, 0.76MHz Nom, HERMETIC SEALED, MINIATURE, CERAMIC PA
CX-2-04-760.0KHZ,A/I	EUROQUARTZ	获取价格	Parallel - Fundamental Quartz Crystal, 0.76MHz Nom,
CX-2-04-760.0KHZ,A/M	EUROQUARTZ	获取价格	Parallel - Fundamental Quartz Crystal, 0.76MHz Nom,

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