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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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
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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 ...
Page 2
... 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 ...