TDA9898HLSLASHV3 datasheet(63/103 Pages) NXP

63 / 103 page

TDA9897_TDA9898_4

Product data sheet

Rev. 04 — 25 May 2009

63 of 103

NXP Semiconductors

TDA9897; TDA9898

Multistandard hybrid IF processing

[5]

BLF(−3dB) = 100 kHz (damping factor d = 1.7; calculated with sync level within gain control range). Calculation of the VIF PLL ﬁlter by

using the following formulae:

, valid for d

≥ 1.2

with the following parameters:

KO = VCO steepness (Hz/V),

KD = phase detector steepness (A/rad),

R = loop ﬁlter serial resistor (

Ω),

C = loop ﬁlter serial capacitor (F),

BLF(−3dB) = −3 dB LF bandwidth (Hz),

d = damping factor.

[6]

The VCO frequency offset related to the PC frequency is set to 1 MHz with white picture video modulation.

[7]

AC load; CL < 20 pF and RL >1kΩ. The sound carrier frequencies (depending on TV standard) are attenuated by the integrated sound

carrier traps.

[8]

Condition: luminance range (5 steps) from 0 % to 100 %. Measurement value is based on 4 of 5 steps.

[9]

Measurement using 200 kHz high-pass ﬁlter, 5 MHz low-pass ﬁlter and subcarrier notch ﬁlter (

“ITU-T J.64”).

[10] Modulation VSB; sound carrier off; fvideo > 0.5 MHz.

[11] Sound carrier on; fvideo = 10 kHz to 10 MHz.

[12] The sound carrier trap can be bypassed by setting the I2C-bus bit W2[0] to logic 0; see Table 23. In this way the full composite video

spectrum appears at pin CVBS. The video amplitude is reduced to 1.1 V (p-p).

[13] Measurement condition: with transformer, transmitter pre-correction on; reference is at 1 MHz.

[14] The response time is valid for a VIF input level range from 200

µVto70mV.

[15] AGC response time increased if no AGC event occurs during two lines at minimum.

[16] AGC response time increased if video level falls below half of selected level.

[17] Load applied to output pin causes signal loss. The resulting gain can be calculated by using

[18] See Figure 19 to smooth current pulses.

[19] To match the AFC output signal to different tuning systems a current output is provided. The test circuit is given in Figure 19. The

AFC steepness can be changed by different applications of resistors R1 and R2.

[20] The AFC value of the VIF and RIF frequency is generated by using digital counting methods. The used counter resolution is provided

with an uncertainty of

±1 bit corresponding to ±25 kHz. This uncertainty of ±25 kHz has to be added to the frequency accuracy

parameter.

[21] Measured with an FM deviation of 25 kHz and the typical AF output voltage of 500 mV (RMS). The audio signal processing stage

provides headroom of 6 dB with THD < 1.5 %. The I2C-bus bits W3[0] and W3[1] control the AF output signal amplitude from

0dBto

−18 dB in steps of −6 dB. Reducing the audio gain for handling a frequency deviation of more than 55 kHz avoids AF output

signal clipping.

[22] Amplitude response depends on dimensioning of FM PLL loop ﬁlter.

[23] The lower AF cut-off frequency depends on the value of the capacitor at pin CAF. A value of CAF1 = 470 nF leads to f−3dB(AF)l ≈ 20 Hz

and CAF1 = 220 nF leads to f−3dB(AF)l ≈ 40 Hz.

[24] For all signal-to-noise measurements the used VIF modulator has to meet the following speciﬁcations:

a) Incidental phase modulation for black-to-white jump less than 0.5 degrees.

b) QSS AF performance, measured with the television demodulator AMF2 (audio output, weighted signal-to-noise ratio) better than

60 dB (at deviation 27 kHz) for 6 kHz sine wave black-to-white video modulation.

c) Picture-to-sound carrier ratio PC / SC1 = 13 dB (transmitter).

[25] The PC / SC ratio is calculated as the addition of TV transmitter PC / SC1 ratio and SAW ﬁlter PC / SC1 ratio. This PC / SC ratio is

necessary to achieve the weighted signal-to-noise values as noted. A different PC / SC ratio will change these values.

[26] Measurement condition is SC1 / SC2

≥ 7dB.

[27] The differential QSS signal output on pins OUT1A and OUT1B is analyzed by a test demodulator TDA9820. The signal-to-noise ratio of

this device is better than 60 dB. The measurement is related to an FM deviation of

±27 kHz and in accordance with “ITU-R BS.468-4”.

3dB

–

()

OK D R

---R2

πK

OKDC

v(load)

--------------------





log

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