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TDA8822 Folha de dados(PDF) 7 Page - NXP Semiconductors

Nome de Peças TDA8822
Descrição Electrónicos  Universal I2C-bus programmable RF modulator
Download  28 Pages
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Fabricante Electrônico  PHILIPS [NXP Semiconductors]
Página de início  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8822 Folha de dados(HTML) 7 Page - NXP Semiconductors

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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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