TDA8295_09 Datasheet, PDF (40/83 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
Table 40. SSIF_LEVEL register (address 23h) bit description
Legend: * = default value.
Bit Symbol
Access Value Description
7 to 5 -
R/W -
not used
4 to 0 SSIF_LVL[4:0] R/W
SSIF output level
0 0001
−12 dB nominal; implemented for flexibility reasons.
With this setting, the adaptation to different standard
requirements can be done.
0 0010
−6 dB nominal; implemented for flexibility reasons.
With this setting, the adaptation to different standard
requirements can be done.
0 0100* Nominal setting; typical output level is 55 mV (RMS)
for PC / SC ratio of 13 dB (see Section 12).
0 1000
+6 dB nominal; implemented for flexibility reasons.
With this setting, the adaptation to different standard
requirements can be done.
1 0000
+12 dB nominal; implemented for flexibility reasons.
With this setting, the adaptation to different standard
requirements can be done.
X XXXX don’t care if mono sound output is chosen
(SSIF_SND[1:0] = 01)
9.3.13 Status registers: ADC saturation, AFC, H/V PLL and AGC
Table 41. ADC_SAT register (address 24h) bit description
Bit Symbol
Access Value Description
7 to 0 ADC_SAT[7:0] R
-
With ADC_SAT, the ADC saturation percentage in a
period of 40 ms can be calculated by the following
formula:
saturation
=
A_----D_-----C_----__---S_---A_---T_--
256
(%)
.
Table 42. AFC register (address 25h) bit description
Bit Symbol
Access Value Description
7 to 0 AFC[7:0]
R
-
This is the readout for AFC^[1]. AFC contains the
frequency deviation from nominal IF picture carrier.
The format is twos complement, 13.2 kHz steps are
done per LSB. See Table 43 and Figure 11 for details.
The frequency deviation could also be given by the
following formula:
f_IF – f_nom
=
–_----A_---F_----C_------×_----6_-----7_---5_---0_{- (kHz)}
512
.
For a frequency deviation from the nominal IF picture
carrier greater than the FPLL pull-in capability
(−830.6 kHz to +843.8 kHz or −1 674.3 kHz to
+1 687.5 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.
TDA8295_C2_2
Product data sheet
Rev. 02 — 27 November 2009
© NXP B.V. 2009. All rights reserved.
40 of 83