TDA8822T PHILIPS [NXP Semiconductors], TDA8822T Datasheet - Page 11

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TDA8822T

Manufacturer Part Number
TDA8822T
Description
Universal I2C-bus programmable RF modulator
Manufacturer
PHILIPS [NXP Semiconductors]
Datasheet

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Table 9 Overview of the test modes
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
2. In ‘f
3. In ‘f
4. In ‘f
5. In ‘f
6. In ‘both CP sinking or sourcing current’ modes, the charge pump of the audio PLL and the one of the video PLL are
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.
10. In the ‘baseband signal on RF outputs’ mode, the RF oscillator is off, and it is possible to measure the baseband
11. During the ‘balance test’ mode the picture carrier is over-modulated allowing the measurement of the residual carrier.
1997 Jan 08
Universal I
modulator
T0
1
1
1
1
1
1
1
1
any effect, and that the output port does not sink any current.
divided by the dividing ratio of the audio programmable divider).
by the dividing ratio of the video programmable divider).
sinking or sourcing their nominal current.
In this mode, the video PLL is off.
video and audio subcarrier signals on the RF output pins.
div(video)
ref(audio)
div(audio)
ref(video)
RF0
0
0
0
0
1
1
1
1
on P0’ mode, the reference frequency of the audio PLL is available on the port P0.
on P0’ mode, the reference frequency of the video PLL is available on the port P0.
on P0’ mode,
on P0’ mode,
TPSG
2
C-bus programmable RF
0
0
1
1
0
0
1
1
P0
0
1
0
1
0
1
0
1
f
-------------------------
f
------------------------- -
div video
div audio
2
2
PIN
(1)
is available on the port P0 (f
X
X
X
X
X
X
X
X
is available on the port P0 (f
TPSG
f
f
f
f
video charge pump off; note 7
audio charge pump off and balance test; notes 8 and 11
video high impedance test; note 9
baseband signal on RF outputs; note 10
ref(audio)
div(audio)
ref(video)
div(video)
11
on P0; both CP sourcing current; notes 4 and 6
on P0; both CP sinking current; notes 2 and 6
on P0; note 5
on P0; note 3
div(video)
div(audio)
is the frequency of the RF oscillator divided
TEST MODES
is the frequency from the sound oscillator
Preliminary specification
TDA8822

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