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HSP50307 - Burst QPSK Modulator

Datasheet Summary

Description

The HSP50307 is a mixed signal burst QPSK Modulator for upstream CATV Applications.

The HSP50307 demultiplexes and modulates a serial data stream onto an RF Carrier centered between 8 and 15MHz.

The signal spectrum is shaped with α = 0.5 root raised cosine (RRC) digital filters.

Features

  • 256 KBPS Data Rate and 128 KBPS Baud Rate.
  • Burst QPSK Modulation.
  • Programmable Carrier Frequency from 8MHz to 15MHz With a Frequency Step Size of 32kHz.
  • α = 0.5 Root Raised Cosine (RRC) Filtering For Spectrum Shaping.
  • On-Board Synthesizer.
  • Programmable Output Level From 22 to 62dBmV in 1dB Steps.
  • Programmable Charge Pump Current Control.
  • 62dBmV Differential Output Driver for 75Ω Cable.

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Datasheet preview – HSP50307

Datasheet Details

Part number HSP50307
Manufacturer Intersil Corporation
File Size 48.45 KB
Description Burst QPSK Modulator
Datasheet download datasheet HSP50307 Datasheet
Additional preview pages of the HSP50307 datasheet.

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Full PDF Text Transcription

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HSP50307 December 1996 Burst QPSK Modulator Description The HSP50307 is a mixed signal burst QPSK Modulator for upstream CATV Applications. The HSP50307 demultiplexes and modulates a serial data stream onto an RF Carrier centered between 8 and 15MHz. The signal spectrum is shaped with α = 0.5 root raised cosine (RRC) digital filters. On-chip filtering limits spurs and harmonics to levels below -35dBc during transmissions. The output power level is adjustable over a 40dB range in 1dB steps. The maximum differential output level is +62dBmV into 75Ω . A transmitter inhibit function disables the RF output outside the burst interval. The differential output amplifier int7-erfaces to the cable via a transformer. The Block Diagram of the HSP50307 QPSK Modulator is shown below.
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