CXA1994AM データシートの表示（PDF） - Sony Semiconductor

部品番号

コンポーネント説明

メーカー

CXA1994AM

M-ary FSK Demodulating Comparator

Sony Semiconductor 

CXA1994AM/BM

Description of Operation

M-ary (M = 2- or 4-level) FSK emodulation system

Polarity discrimination output and MSB comparator output are used to demodulate the 4-level waveform shown

below.

4-level FSK demodulating waveform

+4.8kHz

+1.6kHz

–1.6kHz

01 00 10 11 01 10 00

–4.8kHz

Polarity discrimination output

POS

NEG

0 011 010

MSB comparator output

1.6kHz

4.8kHz

10 011 00

The 4-level FSK demodulating data is divided into a polarity discrimination output and a MSB comparator

output shown above. Here, the polarity discrimination output corresponds to a conventional NRZ comparator

output. The MSB comparator output is made comparing to the optional level setting between MSB and LSB

levels as reference.

For the 2-level FSK demodulation, it corresponds to a conventional NRZ comparator output.

Take care that the polarity of NRZ output is inverted in CXA1484A.

–6–

Share Link: