TDA8296 Datasheet, PDF (26/87 Pages) NXP Semiconductors – Digital global standard low IF demodulator for analog TV and FM radio

NXP Semiconductors
TDA8296
Digital global standard low IF demodulator for analog TV and FM radio
9.3.4 Picture carrier PLL functions
Table 16. PC_PLL_FUNC register (address 04h) bit description
Legend: * = default value.
Bit
Symbol
Access
Value Description
7 to 3 PC_PLL_BW[4:0]
R/W
picture carrier PLL loop bandwidth selection
0 0001 loop bandwidth 15 kHz (not recommanded)
0 0010 loop bandwidth 30 kHz
0 0100* loop bandwidth 60 kHz
0 1000 loop bandwidth 130 kHz
1 0000 loop bandwidth 280 kHz (not recommanded)
2
PLL_ON
R/W
the picture carrier PLL can be disengaged (e.g. in FM radio
standard)
0
PLL off (FM radio)^[1]
1*
PLL on^[2]
1
PULL_IN
R/W
PULL_IN selects the pull-in range of the picture carrier
PLL/FPLL
0*
pull-in range ±1.66 MHz
1
pull-in range ±830 kHz
0
-
R/W
0*
reserved, must be set to logic 0
[1] The DTO_PC frequency is set via register 09h to 0Bh
[2] The DTO_PC frequency is controlled by VIF_PLL function
9.3.5 Picture and sound carrier DTO
Table 17. 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
09h
DTO_PC_LOW 7 to 0 DTO_PC[7:0] R/W 9Ah*
0Ah
DTO_PC_MID 7 to 0 DTO_PC[15:8] R/W 99h*
0Bh
DTO_PC_HIGH 7 to 0 DTO_PC[23:16] R/W 99h*
Description
For picture processing the digital tuned oscillator
(DTO_PC) provides its oscillation signal to the
demodulator part. For demodulation the
oscillation frequency of the DTO_PC is controlled
by the VIF_PLL. Optional the DTO_PC can
operate at fixed programmed frequency. This will
be the case if PLL_ON register is set to “off”
mode. In case of VIF_PLL mode of the DTO_PC
the register value defines the nominal frequency
of AFC register (seeTable 39). If PLL_ON register
is set to “off” mode the DTO_PC register defines
the fixed oscillation frequency value of the
DTO_PC. The frequency of the DTO_PC is in
relation to the register value by following formula:
DTO_PC
=
f_{--A----D---C-----}⁄_--4_{-----–----}f_--P----C-
f_ADC ⁄ 4
×
2²⁴
.
In case of standard L’ please use the following
formula:
DTO_PC
=
f_PC
×
-----⁴------
f_ADC
×
2²⁴
TDA8296
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 3 March 2011
© NXP B.V. 2011. All rights reserved.
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