TDA8295_09 Datasheet, PDF (68/83 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 72. 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 15) 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
PSRR
power supply rejection ratio f_ripple = 70 Hz; 100 mV (p-p);
video signal: gray; level: 50 %;
TDA8295 stand alone
FM sound; 1.2 V
-
72
- dB
FM sound; 3.3 V
[9] _-
33
- dB
AM sound; 1.2 V
-
68
- dB
AM sound; 3.3 V
[9] _-
37
- dB
f_ripple = 70 Hz; 100 mV (p-p);
video signal: gray; level: 50 %;
together with TDA8275A;
input level: 60 dBμV (RMS)
PC
FM sound; 1.2 V
-
72
- dB
FM sound; 3.3 V
[9] _-
33
- dB
AM sound; 1.2 V
-
22
- dB
AM sound; 3.3 V
[9] _-
22
- dB
f_ripple = 70 Hz; 100 mV (p-p);
video signal: gray; level: 50 %;
together with TDA1827x; input
level: 60 dBμV (RMS) PC
FM sound; 1.2 V
-
72
- dB
FM sound; 3.3 V
[9] _-
33
- dB
AM sound; 1.2 V
-
22
- dB
AM sound; 3.3 V
[9] _-
22
- dB
α_sup(f)L(unw) unwanted leakage
related to SSIF (SC1) in
-
frequency suppression
10 MHz to 200 MHz band
33
- dB
[1] 100 % ADC current; 100 % video DAC current; 50 % sound DAC current.
[2] 100 % ADC current; 50 % video DAC current; 25 % sound DAC current.
[3] See Section 9.3.19 for PLL setting.
[4] Standard dependent located at 7.25 MHz, 8.25 MHz, 9.25 MHz, 9.75 MHz and 10.25 MHz.
[5] The pull-in range can be doubled to ±1660 kHz by I²C-bus register like described in Table 16. Then the AFC read-out has 256 steps.
[6] To counteract a fast IF level reduction, the digital IF AGC loop has a speed-up circuit for positive video modulation.
[7] In the ordinary system application, this slow response is counteracted by the fast digital IF AGC loop. ADC clipping is practically avoided
by fast-attack AGC characteristic.
[8] HAD: 250 ns for M standard, 200 ns for others.
[9] The values given are measured with an IF AGC time constant of 5 Hz. For that, capacitor C7 in Figure 15 must be chosen 220 nF
instead of 2.2 nF. Doing so, the PSRR on 3.3 V together with the tuner can be improved.
[10] SC2 is not listed, but supported for all world standards.
TDA8295_C2_2
Product data sheet
Rev. 02 — 27 November 2009
© NXP B.V. 2009. All rights reserved.
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