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TDA4657 Datasheet(PDF) 10 Page - NXP Semiconductors

No. de pieza TDA4657
Descripción Electrónicos  Generic multi-standard decoder
Download  17 Pages
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA4657 Datasheet(HTML) 10 Page - NXP Semiconductors

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June 1993
10
Philips Semiconductors
Preliminary specification
Generic multi-standard decoder
TDA4657
Notes to the characteristics
1. Burstkey width 4.3
µs.
Burst width 2.25
µs, ratio burst chrominance amplitude 1/2.2.
2. At nominal phase of hue control.
3. V (p-p) of signal divided by 6 times effective noise voltage.
4. H/2 blanking alternately every second line.
5. These pins are leakage current sensitive. Pin 4 for (B
−Y) Channel, pin 8 for (R−Y) Channel.
6. Within 2 dB output voltage deviation.
7. This pin is leakage current sensitive.
8. IC only.
9. Depends also on network on pin 15.
10. Pin 19 for PAL, pin 18 for SECAM, pin 17 for NTSC 4.43 MHz.
Threshold levels are dependent of supply.
11. The field interval of the sandcastle has to be adapted to the ICs TDA2579B and TDA4690.
The thresholds are independent of supply voltage.
12. System scanning sequence: PAL, SECAM, NTSC 4.4.
Sandcastle pulse detector (pin 20; note 11)
C20
input capacitance
−−
10
pF
V20
thresholds for field and line pulse
pulse ON
1.3
1.6
1.9
V
separation
pulse OFF
1.1
1.4
1.7
V
line pulse separation
pulse ON
3.3
3.6
3.9
V
pulse OFF
3.1
3.4
3.7
V
burst pulse separation
pulse ON
5.3
5.6
5.9
V
pulse OFF
5.1
5.4
5.7
V
System control processing (note 12)
td
system hold delay
in event of a signal
disappearing for a
short time
2
3
field
periods
colour killer; colour ON delay
switching occurs
during field blanking
2
3
field
periods
colour OFF delay
0
1
field
periods
ts
scanning time for each system
4
field
periods
QUALITY SPECIFICATION: URV-4-2-59/601
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT


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