Datasheet > RF250-32

RF250-32

更新时间： 2024-10-13 23:32:43

品牌	Logo	应用领域
其他 - ETC		电信集成电路
页数	文件大小	规格书
17页	428K
描述
QUADRATURE DEMODULATOR\|BIPOLAR\|QFP\|48PIN\|PLASTIC

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中文翻译

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RF250-32 数据手册

RF250

Rx ASIC for CDMA, AMPS, and PCS Applications

The RF250 Application-Specific Integrated Circuit (ASIC) is a

triple-mode, dual-band receiver (Rx) intended for use in Code

Division Multiple Access (CDMA) portable phones in both

cellular and Personal Communications System (PCS) bands. As

a dual mode IC, it can be used in CDMA mode or Advanced

Mobile Phone System (AMPS) mode.

Features

•

Supports CDMA/AMPS/PCS1900

modes.

Three battery cell operation

(2.7 V < VCC < 3.6 V).

•

Higher level of integration.

I/Q outputs.

On-chip 100 to 640 MHz oscillators.

Low power operation: <60 mA.

48-pin Thin Quad Flat Pack (TQFP)

package with downset paddle.

The device incorporates all the components required to

implement the receiver front end and the In-Phase and

Quadrature (I/Q) demodulator stages except for the filter blocks

and PCS Low Noise Amplifier (LNA). Besides a cellular band

LNA, there are separate mixers for AMPS, CDMA 800 MHz, and

PCS bands. The AMPS mixer output is single-ended, followed

by the AMPS Intermediate Frequency (IF) Surface Acoustic

Wave (SAW) filter. The cellular and PCS mixers have balanced

outputs for the CDMA IF SAW filters. The mixers are followed by

an IF Variable Gain Amplifier (VGA) and an I/Q demodulator.

Applications

•

Tri-mode handsets.

CDMA and AMPS modes in the

cellular band:

- AMPS

- CDMA-US

- CDMA-J

CDMA mode in the PCS band:

- US-PCS

The outputs from the filters are combined through separate

buffers at the input of the VGA. The buffers are enabled

depending on the selected mode. The VGA has a gain control

range greater than 90 dB. There are two VHF oscillators that

operate with external tank circuits. They provide signals to the

Local Oscillator (LO) for the I/Q demodulator in the cellular and

PCS bands.

•

- K-PCS

The noise figure, gain, and third order Input Intercept

Point (IIP3) of each stage in the receiver chip are

optimized to meet the system requirements for AMPS

and CDMA modes as per TIA/EIA-98-B and ANSI J-

STD-018 (PCS). Employing silicon bipolar technology,

the ASIC is designed for high performance and a high

level of integration.

48 47 46 45 44 43 42 41 40 39 38 37

GND

PCS_IF_OUT+

PCS_IF_OUT-

AMPS_IF_OUT

CDMA_IF_OUT+

CDMA_IF_OUT-

CELL_MIX_BYPASS

VGA_PCS_IN+

VGA_PCS_IN-

VGA_AMPS_IN

VGA_CDMA_IN+

VGA_CDMA_IN-

VCC3

The device package and pinout are shown in Figure 1. A^{CELL_LNA_DECOUPLE}

block diagram of the RF250 is shown in Figure 2.

CELL_LNA_IN

VCC1

CELL_BIAS_SET

CELL/PCS

FM/CDMA

VCC2

GND

CELL_TANK-

CELL_TANK+

13 14 15 16 17 18 19 20 21 22 23 24

C452

Figure 1. RF250 Rx ASIC Pinout – 48-Pin TQFP

Package With Downset Paddle

Data Sheet

Conexant Systems, Inc.

Doc. No. 101251A

August 24, 2000

12 3 4 5 6 7...17

中文翻译

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