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BCM3125 Datasheet, PDF (1/2 Pages) Broadcom Corporation. – UNIVERSAL TRANSMISSION SOLUTION | |||
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BCM312 5
PRODUCT
®
Brief
BCM312 5 QAMLink® UNIVERSAL TRANSMISSION SOLUTION
BCM3125 FEATURES
⢠Integrated QAMLink® in-band receiver
⢠10-bit A/D converter with input AGC amplifier
⢠Variable symbol rate 256-QAM receiver
⢠Digital demodulator, Nyquist filters, tracking loops,
and 32-tap adaptive decision feedback equalizer
⢠ITU-T J.83 Annex A/B/C compatible FEC decoder
⢠Integrated QPSK out-of-band receiver
⢠Baseband interface to dual 6-bit A/D converters or IF
interface to signal A/D converter
⢠Variable symbol rate QPSK receiver
⢠Digital demodulator, Nyquist filters, tracking loops,
and 4-tap adaptive decision feedback equalizer
⢠DigiCipher®II/DVB/DAVIC FEC decoder
⢠MPEG transport output interface/DAVIC MAC
output interface
⢠Integrated upstream transmitter
⢠Programmable Starvue
II/DOCSISâ¢/EuroDOCSISâ¢/DVB/ DAVIC FEC
encoder
⢠Pre-equalization filter
⢠Up to 6 MBaud variable rate QPSK/16-QAM modulator
⢠10-bit D/A converter with output power control
interfaces
⢠Control unit
⢠BSC/SPI compatible interface for configuration and
device control
⢠RF tuner control
⢠160-pin PQFP package
SUMMARY OF BENEFITS
⢠Universal set-top and cable modem front-end
supports the ITU-T J.83 Annex A/B/C standards, as
well as OpenCableâ¢, DOCSIS/EuroDOCSIS, and
DVB/DAVIC
⢠Connects directly to Broadcom digital TV ICs
supporting physical layer requirements including
out-of-band
⢠Represents a complete solution for dual
downstream channels (in-band and out-of-band) and
the upstream channel
⢠Integrated analog front end for the dual downstream
and upstream blocks reduces board complexity and
system costs
⢠Serial control interface results in reduced overall pin
count
⢠Out-of-band QPSK receiver provides flexibility for
IF or baseband inputs
⢠Single, low-cost crystal solution eliminates costly
VCXOs
⢠Includes direct interface to the OpenCable point-of-
deployment (POD) module
⢠Single device supports both 6-MHz and 8-MHz
channels
⢠Allows direct connection to Broadcom ICs to support
additional data and video channels for
DOCSIS/EuroDOCSIS/DAVIC systems and PVR set-
top boxes
Set-Top Box Block Diagram
Tuner
In-Band Channel
Out-of-Band Channel
Upstream Channel
BCM3125
QAMLink®
Universal
Transmission
Solution
BCM7020/BCM7030
High Definition Video /
Graphics Subsystem
Audio
Video
CPU
I/O
Memory
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