TDA5230 Datasheet, PDF (90/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
TDA2531:
For Hi-Side LO Injection mode operation:
NCO _dec
=
round


^{224 *}

5 * f_{SYS −}
4
f _SYS
f _IF






This value must be converted to HEX Format and written to the registers FSKNCO2
FSKNCO1 and FSKNCO0, where FSKNCO2 is the MSB register.
The calculation above is fully automatically performed by the IAF TDA523x
Configuration Tool!
Dual: AFSKNCO0 and BFSKNCO0: FSK DDS NCO Frequency Offset
ADDR: 0x78 and 0x98
Bit R/W Description
7:0 W NCOINC: FSK NCO Register Bits (7:0) LSB
Reset Value: 0x00
Dual: AFSKNCO1 and BFSKNCO1: FSK DDS NCO Frequency Offset
ADDR: 0x79 and 0x99
Bit R/W Description
7:0 W NCOINC: FSK NCO Register Bits (15:8)
Reset Value: 0x00
Dual: AFSKNCO2 and BFSKNCO2: FSK DDS NCO Frequency Offset
ADDR: 0x7A and 0x9A
Reset Value: 0x00
Bit R/W Description
7:0 W NCOINC: FSK NCO Register Bits (23:16) MSB
NCO value calculation (for the register FSKNCO0, FSKNCO1 and
FSKNCO2)
CIC Filter
The CIC Decimation Filter is used for bandwidth reduction. The selectable pre-filter
bandwidths are identified in the following table:
Data Sheet
86
Version 4.0, 2007-06-01