LA7642N Datasheet, PDF (4/6 Pages) Sanyo Semicon Device – SECAM Format Color TV Chrominance Circuit

Continued from preceding page.
Parameter
De-emphasis 63k R-Y
De-emphasis 250k B-Y
De-emphasis 250k R-Y
[Sandcastle Pulse]
V threshold voltage
H threshold voltage
BGP threshold voltage
[System Switching]
SECAM threshold voltage 1
SECAM threshold voltage 2
[Killer Output: Pin 13]
Killer on output level
Killer off output level
[Reference Frequency Input Block]
4.00-MHz input level variations 1
LA7642N
Symbol
Conditions
DE63R
DE250B
DE250R
Input a signal to which a 63-kHz modulation
has been applied to pin 14 and measure the
pin 6 R-Y amplitude Vron (V p-p) when pre-
emphasis is on. Next, turn off preemphasis,
measure the pin 6 R-Y amplitude Vroff
(V p-p), and calculate DE63R from the
following formula.
DE63R = 20 × log (Vroff/Vron) (dB)
Input a signal to which a 250-kHz modulation
has been applied to pin 14 and measure the
pin 7 B-Y amplitude Vbon (V p-p) when pre-
emphasis is on. Next, turn off preemphasis,
measure the pin 7 B-Y amplitude Vboff
(V p-p), and calculate DE250B from the
following formula.
DE250B = 20 × log (Vboff/Vbon) (dB)
Input a signal to which a 250-kHz modulation
has been applied to pin 14 and measure the
pin 6 R-Y amplitude Vron (V p-p) when pre-
emphasis is on. Next, turn off preemphasis,
measure the pin 6 R-Y amplitude Vroff
(V p-p), and calculate DE250R from the
following formula.
DE250R = 20 × log (Vroff/Vron) (dB)
Ratings
min
typ
–1.0
–2.6
–4.5
–7.0
–6.5
–9.0
Unit
max
–4.0
dB
–9.5
dB
–11.5
dB
Apply at least 16 pulses with an amplitude of
0 V to V_CC and then take the following
measurement. Apply a DC voltage to pin 10
VBLK _{and slowly increase this voltage starting at}
1.0
1.3
1.6
V
0 V. Measure the DC voltage applied to pin
at the point the pin 3 DC voltage exceeds 3 V.
Apply at least 16 pulses with an amplitude of
0 V to V_CC and then take the following
measurement. Apply a pulse signal with a
12-µs high period and a 52-µs low period
HBLK (for a 64-µs cycle) and slowly increase the
2.5
3.0
3.5
V
amplitude of that signal starting at 0. Measure
the wave height of that pulse signal at the
point the pin 7 (B-Y) DC voltage exceeds
VBYBLK + 100 mV.
Apply at least 16 pulses with an amplitude of
0 V to V_CC and then take the following
measurement. Apply a pulse signal with a
12-µs high period and a 52-µs low period
(for a 64-µs cycle) and slowly increase the
BGP _{amplitude of that signal starting at 0. Measure}
4.5
5.0
5.5
V
the wave height of that pulse signal at the
point the pin 4 (IDF) DC voltage becomes
higher than it was at the point the pulse signal
wave height was 0.
Slowly increase the pin 12 DC voltage from
SESWLO 0 V and measure that voltage at the point
the mode switches to a non-SECAM mode.
Slowly increase the pin 12 DC voltage from
SESWHI 3 V and measure that voltage at the point
the mode switches to SECAM mode.
1.0
1.3
1.6
V
3.6
3.9
4.3
V
VKILON
VKILOF
Measure the pin 13 voltage when the killer
circuit is on.
Measure the pin 13 voltage when the killer
circuit is off.
0.0
0.2
0.5
V
7.3
7.8
7.8
V
Measure the variation in the pin 5 DC voltage
V5DS4 when the 4.00-MHz input level is changed
–50
from 200 mV p-p to 100 mV p-p.
0
+50 mV
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