QR96 Datasheet, PDF (1/2 Pages) Radiometrix Ltd – 9600 Baud Quasi DC Data Recovery Module

NEW
Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
27 February 2008
Tel: [phone], Fax: [phone]
QR96
Wide₉.co₆.u₀k _{0 Baud Quasi DC Data Recovery Module}
The Quasi DC Recovery circuit (QR96) can be
used to improve data recovery of receiver if the
raw data is transmitted without any bit
balancing. The QR96 measures the minimum
and maximum levels of the AF output of the
receiver, averages that and compares the
original AF output signal with it. The module
can be used in applications where raw (non-bit
balanced) data need to be transmitted and
received between two UARTs.
Figure 1: QR96
Features
Recovery of data signals with frequencies down to 2Hz
Tolerates time between bit transitions as long as 250ms
Permits non-bit balanced data stream like straight ASCII
Improves link margin by about 6dB, hence doubles the line of sight range on raw data
Customisable to different data, preamble timing requirements (e.g. NMEA sentences)
Supply Voltage: 3 to 5V
Small size: 18.5 x 10 x 5.5mm
Pin outs and foot print compatible with Radiometrix SIL Receivers
Compared to conventional Data Slicer circuit currently used in the most of the FSK receivers, Quasi DC
Recovery circuit can extract non-bit balanced data at RF signal level that is 6dB lower, resulting in double the
range.
Conventional Data Slicers are based on simple ‘RC integrate and compare’ method to digitise the
demodulated analogue signal, whereas, the QR96 samples positive and negative peaks of the Audio (AF)
output and then averages them, before using that voltage as the comparator reference. QR96 behaves better
on very unbalanced (raw) data, and at the start of bursts (where the simple RC takes time to acquire or
charged to the mid average point).
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QR96 - Short Technical Overview
www.radiometrix.com