CX74001(2000) 데이터 시트보기 (PDF) - Conexant Systems

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CX74001
(Rev.:2000)

Rx ASIC for CDMA, AMPS, and PCS Applications

Conexant Systems 

Rx ASIC

CX74001

Pin #

23

24

Name

SLEEP

VGA_CONTROL

Table 1. CX74001 Pin Assignments and Signal Descriptions (2 of 2)

Description

Digital signal used to activate the receiver ASIC: 0 = sleep, 1= enable.

Analog gain control of the VGA. Typical 0.5 to 2.5V to control VGA dynamic range of greater

than 90dB.

Equivalent Circuit

25

VCC_IF

Voltage supply to VGA from I/Q demodulator stages and logic blocks. Supply should be

bypassed to prevent signal modulation to the supply line.

26

CDMA_VGA_IN–

CDMA differential VGA input

+

–

27

CDMA_VGA_IN+

CDMA differential VGA input

28

AMPS_VGA_IN

AMPS VGA input

29

PCS_VGA_IN–

PCS differential VGA input

+

–

30

PCS_VGA_IN+

PCS differential VGA input

31

CDMA_MIX_OUT–

CDMA differential cellular mixer open collector output. VCC pull up inductor is required, and

the output impedance is set by an external matching network.

32

CDMA_MIX_OUT+

CDMA differential cellular mixer open collector output. VCC pull up inductor is required, and

the output impedance is set by an external matching network.

+

33

AMPS_MIX_OUT–

AMPS differential mixer open collector output. VCC pull up inductor is required, and the output

impedance is set by an external matching network.

–

34

AMPS_MIX_OUT+

AMPS differential mixer open collector output. VCC pull up inductor is required, and the output

impedance is set by an external matching network.

35

PCS_MIXER_OUT–

PCS differential mixer open collector output. VCC pull up inductor is required, and the output

impedance is set by an external matching network.

36

PCS_MIXER_OUT+

PCS differential mixer open collector output. VCC pull up inductor is required, and the output

impedance is set by an external matching network.

37

VCC_MIX

Voltage supply for the mixers. RF bypass capacitor should be close to pin with minimal trace

length.

38

PCS_LO

The local oscillator input for the PCS band mixer.

39

CELL_LO

The local oscillator input for the cellular band mixer.

101134A

Conexant - Preliminary

5

October 20, 2000

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