bcm3421 Broadcom Corp., bcm3421 Datasheet

bcm3421

Manufacturer Part Number

bcm3421

Description

Advanced Direct Conversion Cable Tuner

Manufacturer

Broadcom Corp.

Datasheet

1.BCM3421.pdf (2 pages)

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Download datasheet (134Kb)

•

Single-chip direct conversion silicon tuner completes system

design with Broadcom cable modem or set-top box

DOCSIS

Supports 64, 256, and 1024 QAM

Input frequency range of 50 MHz through 930 MHz

IF (intermediate frequency) output range of 4 MHz, 4.5 MHz,

and 5 MHz

For use in 6-MHz, 7-MHz, and 8-MHz systems

High linearity across entire frequency range

Differential signals for high noise immunity

Integrated and cost-effective BOM:

• True single-chip tuner

• Single 3.3V supply voltage

• Fully integrated oscillator

• Fully integrated channel selectivity

Symmetrical IF output for direct connection to channel decoder

Received Strength Signal Indicator (RSSI) information

provided through Broadcom Serial Control (BSC) bus

Standby mode

40-pin MLF package

RoHS-compliant

ADVANCED DIRECT CONVERSION CABLE TUNER

/EuroDOCSIS™ 1.0/1.1/2.0

F E A T U R E S

Diplex

Filter

Tuner Application Example (Cable Modem)

50 MHz–930 MHz

Silicon Tuner

BCM3421

5 MHz–65 MHz

BCM3421

•

Cable modems

Cable gateways

Single-tuner set-top boxes

Non-battery voice cable modems

Extreme integration level leads to highly cost-effective BOM

Eliminates significant external components:

• SAW (Surface Acoustic Wave) IF filters

• RSSI measurement components

• IF amplifiers

• Oscillator components

Package optimization enables low-cost two-layer system PCB

Minimal in-house RF expertise required

Support for DOCSIS/EuroDOCSIS 2.0 enables one device

solution to be used worldwide

Superior alternative to can tuners

• High quality and reliability (no hand tweaking)

• Enables lower profile and smaller designs

• Proven reference design for quick time-to-market

• Simplified manufacturing flow

Single supply voltage provides low-cost operation

S U M M A R Y O F B E N E F I T S

A P P L I C A T I O N S

DRAM

Cable Modem

Device

Flash

Related parts for bcm3421

bcm3421 Summary of contents

Page 1

... Cable gateways • Single-tuner set-top boxes • Non-battery voice cable modems Tuner Application Example (Cable Modem) 50 MHz–930 MHz BCM3421 Silicon Tuner 5 MHz–65 MHz DRAM Flash ...

... BSC BSC BCM3421 Block Diagram The BCM3421 supports an IF output frequency range of 4 MHz, 4.5 MHz, and 5 MHz, enabling one device to support both DOCSIS and EuroDOCSIS standards. Extreme care was taken to develop proven reference designs that both reduce cost and provide a platform that increases the speed of product development ...

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bcm3421 Broadcom Corp., bcm3421 Datasheet

bcm3421

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bcm3421 Summary of contents

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