TDA8296 Datasheet, PDF (63/87 Pages) NXP Semiconductors – Digital global standard low IF demodulator for analog TV and FM radio

NXP Semiconductors
TDA8296
Digital global standard low IF demodulator for analog TV and FM radio
Table 64. 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; nominal residual picture carrier of
3 % for L/L’ , 10 % for M, 10 % for B/G, 12.5 % for D/K, 20 % for I; FM/AM modulation = 54 %, 1 kHz modulation frequency;
measured in application PCB (see Figure 22 and Figure 23) with 16 MHz crystal frequency, terminated with 75 Ω (CVBS) and
1 kΩ (SSIF/audio). Operation mode set via easy programming (Section 9.3.1), otherwise stated. Low IF input signal at -3dB
full scale, input frequencies as defined under row header IF input.
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 %;
TDA8296 stand alone
FM sound; 1.2 V
-
80
-
dB
FM sound; 3.3 V
[8] _-
39
-
dB
AM sound; 1.2 V
-
40
-
dB
AM sound; 3.3 V
[8] _-
38
-
dB
α_sup(f)L(unw) unwanted leakage
related to SSIF (SC1) in
-
frequency suppression
10 MHz to 200 MHz band
wanted signal (peak-to-peak)
and unwanted signal (RMS)
51
-
dB
[1] See Section 9.3.17 for PLL setting.
[2] Standard dependent located at 6.9 MHz, 7.9 MHz, 8.3 MHz and 9.25 MHz.
[3] 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.
[4] To counteract a fast IF level reduction, the digital IF AGC loop has a speed-up circuit for positive video modulation.
[5] 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.
[6] Graph differential gain versus temperature.
[7] HAD: 250 ns for M standard, 200 ns for others.
[8] The values given are measured with an IF AGC time constant of 5 Hz. For that, capacitor C7 in Figure 19 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.
[9] SC2 is not listed, but supported for all world standards.
[10] At high deviation mode at D/K standard, IF frequency has to be programmed, that SIF frequency is higher than 500 kHz
(default: 350 kHz).
[11] To set audio gain to +6 dB for internal sound demodulation, register 22h has to be programmed to 08h.
TDA8296
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 3 March 2011
© NXP B.V. 2011. All rights reserved.
63 of 87