TDA8296 datasheet(63/87 Pages) NXP

63 / 87 page

TDA8296

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Product data sheet

Rev. 1 — 3 March 2011

63 of 87

NXP Semiconductors

TDA8296

Digital global standard low IF demodulator for analog TV and FM radio

[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.

PSRR

power supply rejection ratio fripple = 70 Hz; 100 mV (p-p);

video signal: gray; level: 50 %;

TDA8296 stand alone

FM sound; 1.2 V

FM sound; 3.3 V

[8] -

AM sound; 1.2 V

AM sound; 3.3 V

[8] -

sup(f)L(unw)

unwanted leakage

frequency suppression

related to SSIF (SC1) in

10 MHz to 200 MHz band

wanted signal (peak-to-peak)

and unwanted signal (RMS)

Table 64.

Characteristics …continued

Power supplies 3.3 V, 1.2 V; Tamb = 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 k

Ω (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

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