tda8295 NXP Semiconductors, tda8295 Datasheet - Page 24

• Manufacturer Part Number: tda8295
• Description: Tda8295 Digital Global Standard Low If Demodulator For Analog Tv And Fm Radio
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8295_1
Product data sheet
9.3.4 Picture carrier PLL functions
Table 16.
Legend: * = default value.
Bit
7 to 3 PC_PLL_BW[4:0]
2
1
0
Symbol
PLL_ON
PULL_IN
CAR_DET
PC_PLL_FUNC register (address 04h) bit description
Digital global standard low IF demodulator for analog TV and FM radio
Rev. 01 — 4 February 2008
Access Value
R/W
R/W
R/W
R/W
0 0001
0 0010
0 0100*
0 1000
1 0000
0
1*
0
1*
0*
1
Description
picture carrier PLL loop bandwidth selection
the picture carrier PLL can be disengaged (e.g. in
FM radio standard)
PULL_IN selects the pull-in range of the picture
carrier PLL/FPLL
The carrier detector freezes the PLL in case of a
picture carrier overmodulation (especially when the
picture carrier is very low or disappears). In
addition, the picture carrier DTO value is forced to
an optimal one to avoid picture carrier phase drift.
To adjust the threshold see CAR_DET_LVL.
loop bandwidth 15 kHz
loop bandwidth 30 kHz
loop bandwidth 60 kHz
loop bandwidth 130 kHz
loop bandwidth 280 kHz (for very bad transmitter
quality)
PLL off (FM radio)
PLL on
pull-in range 1.66 MHz
pull-in range 830 kHz
carrier detector off
carrier detector on
TDA8295
© NXP B.V. 2008. All rights reserved.
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