TDA8295 Datasheet, PDF (39/77 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
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----^C2---₅-^_--₆-^S---^A----^T-- (%) .
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. 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 for details. The frequency
deviation could also be given by the following formula:
f _IF – f _nom = ^–----^A---^F----^C--₂---₅-^×--₆--⁶-----⁷---⁵---⁰- (kHz) . 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 −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.
TDA8295_1
Product data sheet
Rev. 01 — 4 February 2008
© NXP B.V. 2008. All rights reserved.
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