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TDA1180 Scheda tecnica(PDF) 8 Page - STMicroelectronics

Il numero della parte TDA1180
Spiegazioni elettronici  TV HORIZONTAL PROCESSOR
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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APPLICATION INFORMATION
Pin 1 - Positive supply
The operating supply voltage of the device ranges
from 10V to 13.2V
Pin 2 and 3 - Output
The outputs of TDA1180P are suitable for driving
transistor output stages, they deliver positive pulse
at Pin 3 and negative pulse at Pin 2.
The negative pulse is used for direct driving of the
output stage, while positive pulse is useful when a
driver stage is required.
The rise and fall times of the output pulses are
about 150 ns so that interference due to radiation
are avoided.
Furthermore the output stages are internally pro-
tected against short circuit.
Pin 4 - Protection circuit input
By connecting Pin 4 of the IC to earth the output
pulses at Pin 2 and 3 are shut off ; this function has
been introduced to produced to protect the final
stages from overloads.
The same pulses are also shut off when the supply
voltage falls below 4V.
Pin 5 - Phase shifter filter
To compensate for the delay introduced by the line
final stages, the flyback pulses to Pin 6 and the
oscillator waveform are compared in the oscillator-
flyback pulse phase comparator.
The result of the comparison is a control current
which, after it has been filtered by the external
capacitor connected to Pin 5, is sent to a phase
shifter which adequately regulates the phase of the
output pulses.
The maximum phase shift allowed is: td = tp - tf
where tf is the flyback pulse duration.
Pin 5 has high input and output resistance (current
generator).
Pin 6 - Flyback input
The flyback pulse drives the high impedance input
through a resistor in order to limit the input current
to suitable maximum values.
The flyback input pulses are processed by a double
threshold circuit; this generates the blanking pulses
by sensing low level flyback voltage and the pulses
to drive the phase comparator by sensing high level
flyback voltage, therefore phase jitter caused by
ringing normally associated with the flyback pulse,
is avoided.
Pin 7 - Key and blanking pulse output
The key pulse for taking out the burst from the
chrominance signal is generated from the oscillator
ramp and has therefore a fixed phase position with
respect to the sync.
The key pulse is then added internally to the blank-
ing pulse obtained by correctly forming the flyback
pulse present at Pin 6.
The sum of the two signals (sandcastle pulse) is
available on low impedance at output Pin 7.
Pin 8 and 9 - Sync separators inputs
The video signal is applied by means of two distinct
biasing networks to pins 8 and 9 of the IC and
therefore to the respective vertical and horizontal
sync separators.
The latter take the sync pulses out of the video
signal and make them available to the rest of the
circuit for further processing.
f
(kHz)
O
ϕ
1
0
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
(µs)
Figure 4 : Loop Gain
f
(kHz)
O
V (V)
S
16
15
15.5
15.625
0
2
4
6
8
10
12
14
16
Figure 3 : Free Running Frequency versus
Supply Voltage
TDA1180P
8/12


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