TDA4657 Datasheet, PDF (10/17 Pages) NXP Semiconductors – Generic multi-standard decoder

Philips Semiconductors
Generic multi-standard decoder
Preliminary specification
TDA4657
SYMBOL
PARAMETER
Sandcastle pulse detector (pin 20; note 11)
C₂₀
input capacitance
V₂₀
thresholds for field and line pulse
separation
line pulse separation
burst pulse separation
System control processing (note 12)
t_d
system hold delay
colour killer; colour ON delay
colour OFF delay
t_s
scanning time for each system
QUALITY SPECIFICATION: URV-4-2-59/601
CONDITIONS
MIN. TYP. MAX. UNIT
pulse ON
pulse OFF
pulse ON
pulse OFF
pulse ON
pulse OFF
−
−
10
pF
1.3
1.6
1.9
V
1.1
1.4
1.7
V
3.3
3.6
3.9
V
3.1
3.4
3.7
V
5.3
5.6
5.9
V
5.1
5.4
5.7
V
in event of a signal 2
disappearing for a
short time
switching occurs 2
during field blanking
0
−
−
3
−
3
−
1
4
−
field
periods
field
periods
field
periods
field
periods
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.
June 1993
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