tda8295 NXP Semiconductors, tda8295 Datasheet - Page 39

• 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
9.3.13 Status registers: ADC saturation, AFC, H/V PLL and AGC
Table 40.
Legend: * = default value.
Table 41.
Table 42.
Bit
7 to 5 -
4 to 0 SSIF_LVL[4:0] R/W
Bit
7 to 0 ADC_SAT[7:0] R
Bit
7 to 0 AFC[7:0]
Symbol
Symbol
Symbol
SSIF_LEVEL register (address 23h) bit description
ADC_SAT register (address 24h) bit description
AFC register (address 25h) bit description
Digital global standard low IF demodulator for analog TV and FM radio
Access Value
R/W
Access Value
Access Value
R
Rev. 01 — 4 February 2008
-
0 0001
0 0010
0 0100*
0 1000
1 0000
X XXXX
-
-
Description
not used
SSIF output level
Description
With ADC_SAT, the ADC saturation percentage in a
period of 40 ms can be calculated by the following
formula:
Description
This is the readout for AFC. AFC contains the
frequency deviation from nominal IF picture carrier. The
format is twos complement, 13.2 kHz steps are done
per LSB. See
deviation could also be given by the following formula:
deviation from the nominal IF picture carrier greater
than the FPLL pull-in capability ( 830.6 kHz to
+843.8 kHz or 1674.3 kHz to +1687.5 kHz), the
output reading is undefined. The AFC lock indication
can be taken from the N_H_LOCK information from the
H-sync PLL. The lock occurs inside a frequency
window, which is determined by the pull-in capability of
the FPLL.
f
IF
With this setting, the adaptation to different standard
requirements can be done.
With this setting, the adaptation to different standard
requirements can be done.
Nominal setting; typical output level is 55 mV (RMS)
for PC / SC ratio of 13 dB (see
+6 dB nominal; implemented for flexibility reasons.
With this setting, the adaptation to different standard
requirements can be done.
+12 dB nominal; implemented for flexibility reasons.
With this setting, the adaptation to different standard
requirements can be done.
don’t care if mono sound output is chosen
(SSIF_SND[1:0] = 01)
12 dB nominal; implemented for flexibility reasons.
6 dB nominal; implemented for flexibility reasons.
–
f
nom
saturation
=
–
--------------------------------- - (kHz)
Table 43
AFC
256
=
6 750
ADC_SAT
------------------------ - (%)
for details. The frequency
256
. For a frequency
Section
TDA8295
© NXP B.V. 2008. All rights reserved.
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