TDA8822M Philips Semiconductors, TDA8822M Datasheet - Page 7

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TDA8822M

Manufacturer Part Number
TDA8822M
Description
Universal I2C-bus programmable RF modulator
Manufacturer
Philips Semiconductors
Datasheet

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Philips Semiconductors
Audio part
The audio part provides the following:
Table 2 Sound subcarrier frequency setting
Table 3 Sound subcarrier frequency deviation setting (typical values)
1997 Jan 08
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 I
Table 2). These two bits set the dividing ratio of the
audio programmable divider to get the divided frequency
f
The audio phase detector compares the
phase/frequency of the divided audio frequency f
and the reference frequency for the audio, f
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.
Universal I
modulator
div(audio)
DEV SETTING
SC SETTING
0
1
2
3
0
1
2
3
4
5
6
7
.
2
C-bus programmable RF
DEV2
0
0
0
0
1
1
1
1
SC1
0
0
1
1
DEV1
BIT
BIT
0
0
1
1
0
0
1
1
SC0
2
ref(audio)
C-bus (see
0
1
0
1
DEV0
0
1
0
1
0
1
0
1
div(audio)
and
DEVIATION
7
SOUND SUBCARRIER
FREQUENCY (MHz)
40.0
45.0
50.5
56.5
63.5
71.5
80.0
90.0
(%)
f
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 I
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.
ref(audio)
4.5
5.5
6.0
6.5
and f
B, G, I, D, K
div(audio)
20.0
22.5
25.3
28.3
31.8
35.8
40.0
45.0
can be monitored on the general
DEVIATION (kHz)
Preliminary specification
STANDARD
M, N
M, N
B, G
D, K
10.0
11.3
12.6
14.1
15.9
17.9
20.0
22.5
TDA8822
I
2
C-bus

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