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PDF TDA4454 Data sheet ( Hoja de datos )
| Número de pieza | TDA4454 | |
| Descripción | Multistandard VIF Amplifier and PLL Demodulator | |
| Fabricantes | TEMIC Semiconductors | |
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TELEFUNKEN Semiconductors
TDA4454
Multistandard VIF Amplifier and PLL Demodulator
Application
Monolithic integrated circuit for vision IF signal processing in multistandard TV and VTR sets.
Description
This multistandard video IF processing circuit with PLL
picture carrier regeneration gives a high performance of
linear video demodulation.
The IF signal is internally fed via a 3-stage controlled
wideband amplifier to the video demodulator and the
phase detector. The phase detector compares the phase of
IF signal (0°) with the output signal of the VCO (90°) and
sets the VCO frequency accordingly. A lock detector
switches the PLL loop filter according to the state of the
PLL (locked-PLL slow, unlocked-PLL fast).
A second output of the VCO (0°) provides the reference
carrier for the video demodulator. The polarity of the
demodulator can be inverted by the standard switch
(Pin 10), so that negative or positive modulated IF signals
are always available with the same polarity at the demo-
dulator output. The demodulated video signal is filtered,
amplified and fed via an interference limiter to the video
output (Pin 6).
The standard switch also determines the clamp level of
the video amplifier and the required IF-AGC mode. In the
standard B/G mode the sync peak value is the criterion for
a fast charge and discharge. In the standard L mode on the
other hand, fast AGC action is achieved by charging at
peak white level and discharging by the averaged video
signal (time constant on Pin 7). The response level for dis-
charge has a hysteresis. In the D2MAC mode a similar
function is applied to achieve the AGC, but with different
threshold levels.
An overload detector prevents the PLL becoming
unlocked by large IF input signals.
To achieve a delayed tuner-AGC action, the current
output (Pin 3) can be adjusted with a resistor at Pin 2.
Features
D Suitable for standard B/G, L and D2MAC, processes
negative and positive modulated IF-signals with equal
polarity of the output signal
D High performance video demodulator with PLL
picture carrier regeneration
D Extended video bandwidth (12 MHz) for the demo-
dulation of amplitude modulated MAC-signals
D Standard B/G: AGC acting on the sync peak pulse
D Standard L: fast AGC acting on peak white level with
average value controlled capacitor discharge and
reference hysteresis
D D2MAC: fast AGC acting on peak level with
controlled capacitor discharge
D Output for delayed tuner-AGC, take over point
adjustable
D High input sensitivity
D Ultra white and ultra black limiting
D Supply voltage range 6.8 to 13 V
D Low power consumption
D ESD protection
Package Options
Case: 16-pin DIL plastic
Rev. A1: 04.05.1995
Preliminary Information
1 (11)
1 page  
TELEFUNKEN Semiconductors
TDA4454
Parameters
Test Conditions / Pins Symbol Min. Typ. Max. Unit
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁIF residual voltage
f = 38.9 MHz
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁf = 77.8 MHz
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁUpsetting factor of sync
Vres1
Vres2
DVsync
2
5
3
mV
mV
%
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁpulse in the AGC range
Vsync
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁTilt of half picture
between black and white
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁUltra black limiting
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁthreshold
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁUltra white limiting
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁthreshold
Standard L
Below sync level
Above ultra white level
DVlim1
DVlim2
5 10 %
250 mV
500 mV
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁStandard switch
Pin 10
Control voltage B/G
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁControl voltage L
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁControl voltage D2MAC
Note 6
Vsw1
Vsw2
Vsw3
2.5
0
5.0
4.0 V
1.5 V
Vs V
Notes
Alignment of the VCO
1. A peak white value for at least 10 µs must be
transmitted for each complete frame
2. Loop filter: R1 = 500 W – 1 k, C1 = 0.47 µF
Capacitor VCO circuit: CVCO = 27 – 47 pF
3. Pin 6 unloaded
4. Residual carrier: 10% carrier amplitude
5. Blanking level: 30% carrier amplitude
1. Apply 4.5 V to Pin 5, to disable the broadband
amplifier.
2. Measure the dc-voltage at Pin 11 (phase detector).
3. Apply a 38.9 MHz unmodulated carrier signal to the
IF input (Pins 1–16); adjust the input level so that the
AGC voltage at Pin 5 is between 2.0 V and 2.5 V.
6. Without control voltage at Pin 10 – standard B/G is 4. Adjust the VCO circuit until at Pin 11 is the same
automatically selected
dc-voltage as measured in step 2.
Rev. A1: 04.05.1995
Preliminary Information
5 (11)
5 Page 
TELEFUNKEN Semiconductors
TDA4454
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances ( ODSs).
The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of
continuous improvements to eliminate the use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency ( EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively.
TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain
such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
Rev. A1: 04.05.1995
Preliminary Information
11 (11)
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet TDA4454.PDF ] | |
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