TDA8295 Datasheet, PDF (54/77 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
B_{video(−1dB)}
−1 dB video bandwidth
M/N standard
-
B/G/H, I, D/K, L/L-accent
-
standard
3.9
- MHz
4.9
- MHz
t_ripple(GDE)
group delay equalizer ripple peak value for B/G/H half,
-
time
D/K half, I flat, M (FCC) full,
L/L-accent full standard
20
40 ns
Digital IF AGC (internal loop)
B_{−3dB(cl)}
closed-loop −3 dB
bandwidth
negative modulation (all
[6] ₄₀₀
standards except L/L-accent)
-
- Hz
positive modulation
(L/L-accent standard)
0.2
-
- Hz
t_resp
response time
±20 dB level change; video
settled within ±3 dB
negative modulation (all
3
standards except
L/L-accent)
3
3 ms
positive modulation
(L/L-accent standard)
100
100
100 ms
∆G_AGC
AGC gain range
Tuner IF AGC (external loop)
−20
-
+48 dB
t_resp
response time
at 60 dBµV (RMS) PC input; ^[7]
±20 dB level change; video
settled within ±3 dB
with TDA8275A;
-
4 000
- ms
positive modulation
with TDA8275A;
-
negative modulation
500
- ms
with TDA1827x;
-
3 000
- ms
positive modulation
with TDA1827x;
-
negative modulation
600
- ms
f_{−3dB(lpf)}
low-pass filter −3 dB
frequency
IF AGC postfilter
0.9
1.0
1.1 kHz
TDA8295_1
Product data sheet
Rev. 01 — 4 February 2008
© NXP B.V. 2008. All rights reserved.
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