bcm3420 Broadcom Corp., bcm3420 Datasheet

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bcm3420

Manufacturer Part Number
bcm3420
Description
Bcm3420 - Low-power Direct Conversion Cable Tuner
Manufacturer
Broadcom Corp.
Datasheet

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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 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 the 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
RF splitter provides for loop-through or out-of-band receiver
functions
Standby mode
40-pin MLF package
RoHS-compliant
LOW-POWER DIRECT CONVERSION CABLE TUNER
®
/EuroDOCSIS™ 1.0/1.1/2.0
F E A T U R E S
5 MHz–65 MHz
Diplex
Filter
®
Tuner Application Example (Cable Modem)
50 MHz–930 MHz
BCM3420
Silicon Tuner
BCM3420
Extreme integration level leads to highly cost-effective BOM
Eliminates significant external components
• Surface Acoustic Wave (SAW) IF filters
• RSSI measurement components
• IF amplifiers
• Oscillator components
Package optimization enables low-cost two-layer system PCB
Minimal in-house RF expertise required
Pass-through mode for multituner applications
Support for DOCSIS/EuroDOCSIS 2.0 enables one device
solution to be used worldwide
Superior alternative to can tuners
• High quality and reliability
• Enables lower profile and smaller designs
• Proven reference design for quick time to market
• Simplified manufacturing flow
Single supply voltage provides low-cost operation
Low power consumption is ideal for systems that require
battery back-up operation
Battery backup voice cable modems
Cable set-top boxes
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

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bcm3420 Summary of contents

Page 1

... Battery backup voice cable modems • Cable set-top boxes Tuner Application Example (Cable Modem) 50 MHz–930 MHz BCM3420 Silicon Tuner DRAM Cable Modem Device ...

Page 2

... The BCM3420 is specifically designed for use with Broadcom’s industry-leading single-chip cable modem and set-top box devices. With a low BOM cost and a proven reference design, the BCM3420 provides a better alternative to traditional can tuners. Its low power operation is suited well for applications that require battery backup capability such as VoIP cable modems. With an RF splitter, the device’ ...

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