la7688b Sanyo Semiconductor Corporation, la7688b Datasheet - Page 13

• Manufacturer Part Number: la7688b
• Description: Pal/ntsc Color Television-use Single-chip Lsi
• Manufacturer: Sanyo Semiconductor Corporation

[Chroma block PAL]
RGB output DC
difference voltage
RGB output
residual harmonic
level
RGB output carrier
leak
fsc output pin DC
voltage
fsc output level P
fsc output level N
DEF COIN-L
Xtal SW threshold
PAL SW threshold
NT SW threshold
ACC amplitude
characteristics
Killer operating
point
Killer hyesteresis
RGB output level
Maximum RGB
output
APC pull-in range
Parameter
DVC
Ecar2
Ecar
V 27 OPN
V 27 ACP
V 27 ACN
V 27 LO
V 27 A
V 18 PTH
ACC1p
ACC2p
EKILp
DEKILp
Ebp
EBMAXp
Dfscp+
Dfscp-
V 18 NTH
Symbol
O-33
O-34
O-35
O-33
O-34
O-35
O-33
O-34
O-35
Z-27B
Z-27A
Z-27A
Z-27B
Z-27A
O-35
O-35
O-33
O-33
O-33
O-33
O-33
O-33
O-27A
point
Test
(3)
(3)
(2)
(3)
(3)
(3)
No signal
No signal
(1) PAL
(1) NT
(1)
0dB/6dB
(1)
-20dB
(1) : Level
variable
(1) : Level
variable
(1) Y-OFF
Chroma
50%
(1) Y-OFF
Chroma
50%
(1) fsc
frequency
variable
signal
Input
Obtain the DC difference voltage of each
output measured for Parameter "RGB
difference output DC voltage".
Measure the residual harmonic level for
the scanning period each of RGB
difference outputs.
(SHARP : 0V)
Measure the residual carrier level for the
scanning period each of RGB difference
outputs.
(SHARP : 0V)
Measure the DC voltage.
Measure the AC voltage.
Measure the AC voltage.
Measure the DC voltage.
Measure the frequency voltage.
Measure the AC voltage.
Measure the AC voltage.
Measure the output's Vp-p value.
After chaning the input signal level from
0dB to 6dB, measure the B output's Vp-p
value and calculate the ratio in dB to the B
output's Vp-p value when the input signal
level is 0dB.
In the same manner, obtain the amplitude
variations when the input signal level is
changed from 0dB to -20dB.
Attenuate the input signal level from 0dB
until there comes a point where the B
output ceases ; that point is the killer
operating point.
Measure the difference between killer-on
level and killer-off level.
Measure the Vp-p value of the B output’s
signal component.
BRIGHT : 5V
Measure the Vp-p value of the B output’s
output amplitude.
BRIGHT : 5V
Vary the subcarrier frequency to measure
the pull-in frequency and calculate the
difference from fsc.
LA7688B
Test method
COLOR VR
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
5V
Continued on next page.
CONTRAST
4V
4V
4V
4V
4V
4V
4V
4V
4V
4V
4V
4V
4V
4V
4V
4V
4V
No.0077-13/20
TINT VR
0.6V
0.9V
0V
0V
0V
0V
0V
3V
0V
0V
0V
0V
0V
0V
0V
0V
0V