TDA8822 View Datasheet(PDF) - Philips Electronics
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TDA8822 Datasheet PDF : 28 Pages
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Philips Semiconductors
Universal I2C-bus programmable RF
modulator
Preliminary specification
TDA8822
Table 9 Overview of the test modes
T0 RF0 TPSG P0 PIN(1) TPSG
TEST MODES
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
X
fref(audio) on P0; both CP sinking current; notes 2 and 6
X
fdiv(audio) on P0; note 3
X
fref(video) on P0; both CP sourcing current; notes 4 and 6
X
fdiv(video) on P0; note 5
X
video charge pump off; note 7
X
audio charge pump off and balance test; notes 8 and 11
X
video high impedance test; note 9
X
baseband signal on RF outputs; note 10
Notes
1. During the test mode (bit T0 set to logic 1), the pin TPSG is unused, meaning that the input information does not have
any effect, and that the output port does not sink any current.
2. In ‘fref(audio) on P0’ mode, the reference frequency of the audio PLL is available on the port P0.
3. In ‘fdiv(audio) on P0’ mode, f--d---i--v---(--a2---u---d--i--o---) is available on the port P0 (fdiv(audio) is the frequency from the sound oscillator
divided by the dividing ratio of the audio programmable divider).
4. In ‘fref(video) on P0’ mode, the reference frequency of the video PLL is available on the port P0.
5. In ‘fdiv(video) on P0’ mode, f--d---i--v---(--2v---i-d---e---o--)- is available on the port P0 (fdiv(video) is the frequency of the RF oscillator divided
by the dividing ratio of the video programmable divider).
6. In ‘both CP sinking or sourcing current’ modes, the charge pump of the audio PLL and the one of the video PLL are
sinking or sourcing their nominal current.
7. The ‘video charge pump off’ mode allows to measure the leakage current on the video PLL charge pump.
8. The ‘audio charge pump off’ mode allows to measure the leakage current on the audio PLL charge pump.
9. In the ‘video high-impedance’ mode, it is possible to inject an external tuning voltage for the RF carrier setting.
In this mode, the video PLL is off.
10. In the ‘baseband signal on RF outputs’ mode, the RF oscillator is off, and it is possible to measure the baseband
video and audio subcarrier signals on the RF output pins.
11. During the ‘balance test’ mode the picture carrier is over-modulated allowing the measurement of the residual carrier.
1997 Jan 08
11
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