TDA8295 Datasheet, PDF (27/77 Pages) NXP Semiconductors – Digital global standard low IF demodulator for analog TV and FM radio

NXP Semiconductors
TDA8295
Digital global standard low IF demodulator for analog TV and FM radio
9.3.5 Picture and sound carrier DTO
Table 21. DTO_PC_LOW, DTO_PC_MID and DTO_PC_HIGH register (address 09h to 0Bh) bit description
Legend: * = default value.
Address Register
Bit Symbol
Access Value Description
09h
DTO_PC_LOW 7 to 0 DTO_PC[7:0] R/W 85h* With the digitally tuned picture carrier oscillator
0Ah
DTO_PC_MID 7 to 0 DTO_PC[15:8] R/W F6h* ^{(DTO_PC), the IF frequency for the picture carrier}
0Bh
DTO_PC_HIGH 7 to 0 DTO_PC[23:16] R/W 92h* ^{demodulation can be set. This function is}
implemented for general purpose applications which
are different from nominal TV standards. It can also
be used for debugging purposes. The DTO_PC is
part of the picture carrier PLL. To set the DTO_PC
value to a certain PC input frequency (f_IF), please
use the following formula:
DTO_PC = -¹--³---^.--₁₅---₃-^M--_.-₅--^H---_M--^z---_H-^–---_z--^f---^I--^F- × 2²⁴ . If e.g. the IF
picture carrier input frequency is 5.75 MHz
(M/N standard), one gets 92 F685h as result for
DTO_PC.
Table 22. DTO_SC_LOW, DTO_SC_MID and DTO_SC_HIGH register (address 0Ch to 0Eh) bit description
Legend: * = default value.
Address Register
Bit Symbol
Access Value Description
0Ch
DTO_SC_LOW 7 to 0 DTO_SC[7:0] R/W 55h* The DTO_SC is part of the FM/AM mono sound
0Dh
DTO_SC_MID 7 to 0 DTO_SC[15:8] R/W 55h* ^{demodulator. DTO_SC is calculated in the same}
way as DTO_PC (described above). In case of
0Eh
DTO_SC_HIGH 7 to 0 DTO_SC[23:16] R/W 55h* _{M/N standard (sound carrier at 4.5 MHz), one gets}
55 5555h for DTO_SC.
TDA8295_1
Product data sheet
Rev. 01 — 4 February 2008
© NXP B.V. 2008. All rights reserved.
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