TDA8295 Datasheet, PDF (59/77 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 68. Characteristics …continued
Power supplies 3.3 V, 1.2 V; T_amb = 25 °C; PC / SC1 for L and M = 10 dB, all others 13 dB; residual picture carrier for L = 3 %,
all others 10 %; FM/AM modulation = 54 %, 1 kHz modulation frequency; measured in application PCB (see Figure 12) with
16 MHz crystal frequency, loaded with 75 Ω (CVBS) and 1 kΩ (SSIF/audio). Values are meant for ‘easy programming’
settings (recommended) except internal mono audio and IF demodulation. The low IF spectrum is delivered by a professional
downconverter.
Symbol
Parameter
Conditions
Min
Typ
Max Unit
α_hr(AF)
AF headroom
before clipping; 1 kΩ DC or
AC load
M standard; related to
7
±25 kHz peak deviation
before pre-emphasis
7
7 dB
B, G/H, I, D, K standard;
7
related to ±50 kHz peak
deviation before
pre-emphasis
7
7 dB
L/L-accent standard;
1
PC / SC1 ratio for start of
audio output clipping; AM;
m = 100 %; related to mean
SC1
1
1 dB
FM radio; 30 % modulation
7
degree related to ±22.5 kHz
peak deviation before
pre-emphasis
7
7 dB
τ_deemp
de-emphasis time constant M/N standard (mono);
FM radio USA
75
75
75 µs
B/G/H, I, D/K standard;
FM radio Europe
50
50
50 µs
B_−3dB
−3 dB bandwidth
audio low-pass filter
L/L-accent standard
30
30
30 kHz
M-BTSC standard
140
140
140 kHz
THD
total harmonic distortion
FM; for 50 kHz deviation
-
before pre-emphasis (25 kHz
for M standard)
0.1
0.2 %
AM; m = 80 %
-
0.6
1%
B_{AF(−3dB)}
−3 dB AF bandwidth
AM
FM
20
27
- kHz
40
50
- kHz
α_AM
AM suppression
of FM demodulator;
40
AM: f = 1 kHz; m = 54 %
referenced to 27 kHz FM
deviation
46
- dB
TDA8295_1
Product data sheet
Rev. 01 — 4 February 2008
© NXP B.V. 2008. All rights reserved.
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