TDA8822 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TDA8822

Universal I2C-bus programmable RF modulator

Philips Electronics 

Philips Semiconductors

Universal I2C-bus programmable RF

modulator

Preliminary specification

TDA8822

6. Measured with no pre-emphasis on the audio input and no de-emphasis in the receiver. Measurement is done for

frequencies between 50 Hz and 15 kHz, reference is the level measured at 1 kHz.

7. The accuracy only depends on the accuracy of the reference frequency (accuracy of the crystal). Notice that the

value of the capacitor in series with the crystal must be chosen to be as close as possible to the load capacitance of

the crystal.

8. Except for the harmonics of the RF oscillator frequency and for the combinations between the RF oscillator

frequency and the sound oscillator frequency (fRF + 2fs, 2fRF + fs, etc.). This measurement includes the spurious at

the 1⁄4fRF, 1⁄2fRF and 3⁄4fRF.

9. Chroma beat

a) For PAL: measured applying a 4.43 MHz sine wave of 200 mV (p-p) at the video input. Measurement is the

difference between the level of the unmodulated picture carrier and the level of the spike appearing at the

frequency of the picture carrier plus 1.07 MHz for PAL B/G, 1.57 MHz for PAL I and 2.07 MHz for PAL D/K.

b) For NTSC: measured applying a 3.58 MHz sine wave of 200 mV (p-p) at the video input. Measurement is the

difference between the level of the unmodulated picture carrier and the level of the spike appearing at the

frequency of the picture carrier plus 920 kHz.

10. NICAM beat

a) For PAL B/G: measured applying a sine wave of 150 mV (p-p) at 5.85 MHz on the NICAM input. Measurement

is the difference between the level of the unmodulated picture carrier and the level of the spike appearing at the

frequency of the picture carrier plus 350 kHz or 5.15 MHz.

b) For PAL I: measured applying a sine wave of 150 mV (p-p) at 6.552 MHz on the NICAM input. Measurement is

the difference between the level of the unmodulated picture carrier and the level of the spike appearing at the

frequency of the picture carrier plus 552 kHz or 5.448 MHz.

11. NICAM eye height and Bit Error Rate measurement conditions:

a) A NICAM frame is applied from a Textronix 728E in B/G mode on the NICAM input of the TDA8822 through an

attenuator to get 150 mV (p-p). The sound subcarrier is set to 5.5 MHz (SC = 1) and the picture to sound ratio is

set to -12 dB (PS = 1). There is no video signal applied to the video input and no audio signal on the audio input.

b) The RF carrier is demodulated with a Rohde & Schwartz EMFP demodulator for PAL B/G, the sound trap filter is

set off, and the video signal is fed to a Textronix 728D NICAM demodulator for B/G. Measurements of the eye

height and bit error rate are done on the 728D.

1997 Jan 08

17

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