TDA5230 Datasheet, PDF (83/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
ADCDIV
=
ro
un
d


f--f-_A^--s--_Dy^{---sC--}
–
1
f_ADC
=
[ 96 … 320 k H z ]
ASKDEC
=
r o u n d _{ 1----6-f--}^A-_â‹---^D_f--d--^C-_a--_t--_{a}
–
1
f_ADC
=
--------------f--^s--^y---^s-------------
ADCDIV + 1
Dual: ADCSPLRDIV and BDCSPLRDIV: ADC dividing factor
ADDR: 0x6D and 0x8D
Bit R/W Description
7:0 W ADCDIV: ADC sampling rate division factor.
Reset Value: 0x00
Dual: ADATFILT0 and BDATFILT0: Matched Filter Scaling and Delay
ADDR: 0x6F and 0x8F
Bit R/W Description
5:3 W ASKSCA: CIC-filter Input Scaling Factor¹⁾
000b: default
2:0 W ASKDEL: CIC-filter comb Section delay Factor¹⁾²⁾
use always 110b
1) use default value
2) the CIC filter delay = ASKDEL + 1
Reset Value: 0x00
Dual: ADATFILT1 and BDATFILT1: Matched Filter Decimation
ADDR: 0x70 and 0x90
Bit R/W Description
5:0 W ASKDEC: CIC filter Decimation Factor
Reset Value: 0x00
Matched Data Filter
The CIC Filter together with the DC-offset canceller (realized as differentiator) is a
matched filter for one manchester coded bit.
The Matched Data Filter has two major tasks: to reconstruct Manchester-coded data of
the correct data rate, and to deliver a “quality” value, the so-called ASKNP value.
Data Sheet
79
Version 4.0, 2007-06-01