cx24128 Conexant Systems, Inc., cx24128 Datasheet

cx24128

Manufacturer Part Number

cx24128

Description

Digital Satellite Dual Tuner Rf Ic

Manufacturer

Conexant Systems, Inc.

Datasheet

1.CX24128.pdf (2 pages)

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Bonase Electronics (HK) Co., Limited

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CONEXANT

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Set-top Box Solutions

Satellite

Digital Satellite Dual Tuner RF IC

The CX24128 has a built-in auto-tuning machine that eliminates the need for software

The CX24128 requires a single 3.3 V power supply and has an improved power

RF INPUT

CX24128

calibration routine and accelerates the calibration time. The on-chip fractional

synthesizers enable fine frequency step size without adversely affecting lock time.

supply rejection ratio (PSRR) that reduces the need for power supply conditioning

components required for proper operation. The CX24128 does not require a Balun,

thus reducing external BOM cost. Its highly integrated design saves valuable board

space and simplifies RF layout.

Industry’s First Dual Tuner for DVR Applications

Conexant’s portfolio includes a comprehensive suite of semiconductor solutions for

is Conexant’s innovative dual stream direct down-conversion satellite tuner RF IC

intended for high-volume digital video, audio, and data receivers. The CX24128 offers

excellent phase noise performance and very low implementation loss, required for

advanced modulation systems such as 8PSK and DVB-S2. The CX24128 provides

set-top boxes (STBs).

broadband communications, enterprise networks and the digital home. The CX24128

bill of materials (BOM) savings over two single tuners and simplifies layout for DVR

Reference

Oscillator

Reference

to Demod

VCO

Programming

and Control

CX24128 Block Diagram

PLL Dividers, Phase

Detector and Charge Pump

VCA

PLL Dividers, Phase

Detector and Charge Pump

Amplifier

AGC

Variable Low

Pass Filter

I Channel

Output A

Q Channel

Output A

I Channel

Output B

Q Channel

Output B

Distinguishing Features

• Dual stream RF-to-baseband

• State-of-the-art architecture that

• Zero-IF architecture eliminates the

• Very low phase noise for 8PSK and

• Variable baseband filters for optimal

• Auto-tuning machine eliminates need

• Very low power consumption

• Small (7 mm x 7 mm) footprint

• Lead-free package

Part Number CX24128

Description

satellite receiver

provides for up to 60 decibel (dB)

isolation between two channels

need for image reject filtering

DVB-S2 applications

interference rejection

for software calibration

Digital Satellite Dual Tuner RF IC

Related parts for cx24128

cx24128 Summary of contents

Page 1

... The on-chip fractional synthesizers enable fine frequency step size without adversely affecting lock time. The CX24128 requires a single 3.3 V power supply and has an improved power supply rejection ratio (PSRR) that reduces the need for power supply conditioning components required for proper operation ...

Page 2

... In addition to its IEEE 802.11a/b/g-compliant WLAN chipsets, software, and reference designs, Conexant CX24128 Features • State-of-the-art architecture that provides for decibel (dB) isolation between two channels • RF input: 925–2175 MHz • ...

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