TDA5230 Datasheet, PDF (91/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
The selection is done with the registers FSKFILBW0 and FSKFILBW1.
Setting
+/-250
+/-125
+/-62.5
+/-31.25
Typical 3dB Bandwidth¹⁾
+/-80kHz
+/-50kHz
+/-40kHz
+/-20kHz
FSKDEC Setting
0001b recommended
0011b
0111b
1111b
1) Values are only ”about” values and should be used for orientation only. Bandwidth is also dependent on
IF Filter, FSK Deviation, Data Rate and different configuration settings.
THe CIC-Filter also requires a comb delay and a scaling. For the comb delay, a value of
8 must be used.
The scaling is calculated as below:
SCA = 14 − round [log ₂ (R * M ) + 4]
SCA... Scaling
R...Decimation Factor(=FSKFILBW0+1)
M...Comb Delay Value(=8 +1= 9)
The calculation above is fully automatically performed by the IAF TDA523x
Configuration Tool!
Dual: AFSKFILBW0 and BFSKFILBW0: FSK Pre Filter Decimation
ADDR: 0x7B and 0x9B
Bit R/W Description
3:0 W FSKDEC: FSK Pre Filter Decimation Factor
0001b: ±250 prefilter bandwidth .. recommended
0011b: ±125 prefilter bandwidth
0111b: ±62.5 prefilter bandwidth
1111b: ±31.25 prefilter bandwidth
Reset Value: 0x00
Data Sheet
87
Version 4.0, 2007-06-01