Low-Power Direct-Conversion Cable Tuner

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The BCM3420 is a highly integrated, advanced direct-conversion, single-chip silicon tuner.
The BCM3420 is specifically designed for use with Broadcom's 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 BCM3420 pass-through mode is ideal for use in multituner applications.


  • Integrates the global tuning function including selectivity and supports 64-QAM, 256-QAM and 1024-QAM digital cable modem applications. Single-chip direct-conversion silicon tuner completes system design with Broadcom cable modem or set-top box
  • DOCSIS®/EuroDOCSIS™ 1.0/1.1/2.0
  • Eliminates significant external components such as SAW (Surface Acoustic Wave) IF filters, RSSI measurement components, IF amplifiers and oscillator components
  • VCO (Voltage Controlled Oscillator) is fully integrated with no external tank component


  • Set-Top Boxes
  • Voice over IP (VoIP)

Lifecycle Status

Not Recommended for New Design

Replacement Part

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Specification Value
Lifecycle Not Recommended for New Design
Distrib. Inventory No


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