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TDA8822M Datasheet(PDF) 7 Page - NXP Semiconductors |
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TDA8822M Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 28 page 1997 Jan 08 7 Philips Semiconductors Preliminary specification Universal I2C-bus programmable RF modulator TDA8822 Audio part The audio part provides the following: • The sound subcarrier is created in an integrated VCO. The signal at the output of this VCO is fed to a stage that adjusts the picture-to-sound ratio and to the audio programmable divider. • The frequency of the sound subcarrier is set by programming the bits SC1 and SC0 of the I2C-bus (see Table 2). These two bits set the dividing ratio of the audio programmable divider to get the divided frequency fdiv(audio). • The audio phase detector compares the phase/frequency of the divided audio frequency fdiv(audio) and the reference frequency for the audio, fref(audio) and drives the Charge Pump (CP) that charges or discharges the audio loop filter connected between pins ACP and AGND to get the VCO oscillating to the programmed frequency. • fref(audio) and fdiv(audio) can be monitored on the general purpose output port during a special test mode. • The frequency deviation of the sound subcarrier is set using 3 bits DEV2, DEV1 and DEV0 of the I2C-bus programming (see Table 3), when a signal of 1 kHz with a level of 50 mV (p-p) is applied on the audio input pin. • The difference between the picture carrier level and the sound subcarrier level is adjusted using 3 bits PS2, PS1 and PS0 (see Table 4). • The NICAM amplifier has a constant gain, and is designed for adding a second sound subcarrier in the TV channel. This subcarrier can be either a second FM carrier for dual-sound/stereo system used in PAL B/G or a modulated NICAM carrier. The level between the picture carrier and the NICAM carrier (P/N) will depend on the input level on the NICAM input. Table 2 Sound subcarrier frequency setting Table 3 Sound subcarrier frequency deviation setting (typical values) SC SETTING BIT SOUND SUBCARRIER FREQUENCY (MHz) STANDARD SC1 SC0 0 0 0 4.5 M, N 1 0 1 5.5 B, G 2 1 0 6.0 I 3 1 1 6.5 D, K DEV SETTING BIT DEVIATION (%) DEVIATION (kHz) DEV2 DEV1 DEV0 B, G, I, D, K M, N 0 0 0 0 40.0 20.0 10.0 1 0 0 1 45.0 22.5 11.3 2 0 1 0 50.5 25.3 12.6 3 0 1 1 56.5 28.3 14.1 4 1 0 0 63.5 31.8 15.9 5 1 0 1 71.5 35.8 17.9 6 1 1 0 80.0 40.0 20.0 7 1 1 1 90.0 45.0 22.5 |
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