TDA9554PS datasheet(99/125 Pages) PHILIPS

99 / 125 page

2000 Jun 22

Philips Semiconductors

Tentative Device Speciﬁcation

TV signal processor-Teletext decoder with

embedded

µ-Controller

TDA955X/6X/8X PS/N1 series

10. Measured in accordance with the test line given in Fig.36. For the differential phase test the peak white setting is

reduced to 87%.

The differential gain is expressed as a percentage of the difference in peak amplitudes between the largest and

smallest value relative to the subcarrier amplitude at blanking level.

The phase difference is defined as the difference in degrees between the largest and smallest phase angle.

11. This figure is valid for the complete video signal amplitude (peak white-to-black), see Fig.37.

12. The noise inverter is only active in the ‘strong signal mode’ (no noise detected in the incoming signal)

13. The test set-up and input conditions are given in Fig.38. The figures are measured with an input signal of

10 mV RMS. This test can only be carried out in a test set-up in which the test options of the IC can be activated.

This because the IF-AGC control input is not available in this IC.

14. Measured at an input signal of 10 mVRMS. The S/N is the ratio of black-to-white amplitude to the black level noise

voltage (RMS value). B = 5 MHz. Weighted in accordance with CCIR 567.

15. The time-constant of the IF-AGC is internal and the speed of the AGC can be set via the bits AGC1 and AGC0 in

subaddress 28H. The AGC response time is also dependent on the acquisition time of the PLL demodulator. The

values given are valid for the ‘norm’ setting (AGC1-AGC0 = 0-1) and when the PLL is in lock.

16. The AFC control voltage is generated by the digital tuning system of the PLL demodulator. This system uses the

clock frequency of the

µ-Controller/Teletext decoder as a reference and is therefore very accurate. For this reason

no maximum and minimum values are given for the window sensitivity figures (parameters M.7.2 and M.7.3). The

tuning information is supplied to the tuning system via the AFA and AFB bits in output byte 02H. The AFC value is

valid only when the LOCK-bit is 1.

17. The reference signal for the I-mixer (frequency 42 or 48 MHz) is internally generated. It is also possible to supply an

external reference signal to the mixer. This external mode is activated by means of the IFE bit, the signal has to be

supplied to the pin which is normally used as the reference signal output of the colour decoder (REFO).

18. The weighted S/N ratio is measured under the following conditions:

a) The vision IF modulator must meet the following specifications:

Incidental phase modulation for black-to-white jumps less than 0.5 degrees.

QSS AF performance, measured with the television-demodulator AMF2 (audio output, weighted S/N ratio) better

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

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

b) The measurements must be carried out with the Siemens SAW filters G3962 for vision IF and G9350 for sound

IF. Input level for sound IF 10 mVRMS with 27 kHz deviation.

c) The PC/SC ratio at the vision IF input is calculated as the addition of the TV transmitter ratio and the SAW filter

PC/SC ratio. This PC/SC ratio is necessary to achieve the S/N(W) values as indicated.

TDA9554PS Datasheet(PDF) 99 Page - NXP Semiconductors