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TDA8295 Datasheet, PDF (62/77 Pages) NXP Semiconductors – Digital global standard low IF demodulator for analog TV and FM radio | |||
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NXP Semiconductors
TDA8295
Digital global standard low IF demodulator for analog TV and FM radio
Table 68. Characteristics â¦continued
Power supplies 3.3 V, 1.2 V; Tamb = 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 ⦠(CVBS) and 1 k⦠(SSIF/audio). Values are meant for âeasy programmingâ
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 fripple = 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
fripple = 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
fripple = 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
αsup(f)L(unw) unwanted leakage
related to SSIF (SC1) in
-
frequency suppression
10 MHz to 200 MHz band
33
- dB
[1] 50 % ADC current; 100 % video DAC current; 50 % sound DAC current.
[2] 50 % 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 12 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_1
Product data sheet
Rev. 01 â 4 February 2008
© NXP B.V. 2008. All rights reserved.
62 of 77
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