RF250-32 Ver la hoja de datos (PDF) - Conexant Systems

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RF250-32

Rx ASIC for CDMA, AMPS, and PCS Applications

Conexant Systems 

RF250

The local oscillators for the I/Q demodulators are

derived by an on-chip frequency divider. The logic

signal to select the divider ratio (2 or 4) is available

on Pin 15 (DIV2/DIV4).

Mode Control. The operation of the chip is

controlled by signals at Pin 7 (CELL/PCS), Pin 8

(FM/CDMA), Pin 23 (SLEEP), and the DIV2/DIV4

select commands at Pin 15. All the switching is

done internally. The supply voltage should be

present at all the VCC pins for normal operation.

The internal switching needed to select each of

these signals is shown in Table 1.

Electrical and Mechanical Specifications.

Included in this document are Tables 1 through 5

and Figures 1 through 29, which define the

electrical and mechanical specifications of the

RF250.

Table 1:

Table 2:

Table 3:

Table 4:

Table 5:

Figure 1:

Mode Control Select Signal

Switching

Pin Assignments and Functional

Pin Descriptions

Absolute Maximum Ratings

Recommended Operating

Conditions

Electrical Specifications

Pinout Configuration

Rx ASIC

Figure 2:

Functional Block Diagram

Figures 3 - 27: Typical Functional Block

Performances

Figure 28:

Package Dimensions

Figure 29:

Tape and Reel

Dimensions

ESD Sensitivity

The RF250 is a Class 1 device. The following

extreme Electrostatic Discharge (ESD) precautions

are required according to the Human Body Model

(HBM):

• Protective outer garments.

• Handle device in ESD safeguarded work

area.

• Transport device in ESD shielded

containers.

• Monitor and test all ESD protection

equipment.

The HBM ESD withstand threshold value, with

respect to ground, is ±1.5 kV. The HBM ESD

withstand threshold value, with respect to VDD

(the positive power supply terminal) is also ±1.5

kV.

Pin

7 (CELL/PCS)

8 (FM/CDMA)

15 (DIV2/DIV4)

23 (SLEEP)

Key: 0 = LOW

1 = HIGH

x = N/A

AMPS

0

0

0

1

CDMA

0

1

0

1

PCS

1

x

0

1

Table 1. Mode Control Select Signal Switching

101251A

Conexant Systems, Inc.

3

August 24, 2000

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