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PDF LA7688B Data sheet ( Hoja de datos )
| Número de pieza | LA7688B | |
| Descripción | PAL/NTSC Color Television-use Single-chip LSI | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number : ENA0077
LA7688B
Monolithic Linear IC
PAL/NTSC Color Television-use
Single-chip LSI
Overview
The LA7688B integrates VIF, SIF, video, chrominance, and deflection processing circuits for PAL/NTSC format TV sets on
a single chip and is provided in a 52-pin shrink package.
The VIF and SIF circuits achieve semi-adjustment-free operation, and are adjustment-free except for the VCO coil and the
RF AGC circuit. The chrominance circuit can be made adjustment-free by using the LC89950 1H delay line IC. All the signal
processing required for a multi-format color TV can be implemented by combining this product with the LA7642 SECAM
decoder IC.
Functions
• VIF, SIF, VIDEO, CHROMA DEFLECTION
Specitications
Absolute Maximum Ratings at Ta = 25 °C
Parameter S
ymbol
Conditions
Maximum supply voltage
Maximum supply current
FBP input current
FBP input voltage
Allowable power dissipations
V40 max
V45 max
I24 max
I26 max
I32 max
V26 min
Pd max
Ta ≤ 65°C, ∗Mounted on board
Operating temperature
Topr
Storage temperature
Tstg
∗Board size : 83×86×1.5mm, material : bakelite
Operating Conditions at Ta = 25 °C
Parameter S
Recommended supply voltage
Recommended supply current
Operating supply voltage range
Operating supply current range
ymbol
V40
V45
I24
V40 op
V45 op
I24 op
Conditions
Ratings
9
9V
16
5
10
-5
1.3
-10 to +65
-55 to +150
Unit
V
mA
mA
mA
V
W
°C
°C
Ratings
7.6
7.6
12
7 to 8.2
7 to 8.2
10 to 16
Unit
V
V
mA
V
V
mA
O3005 MS PC B8-4714 No.0077-1/20 http://www.Datasheet4U.com
1 page  
Continued from preceding page.
Parameter S
ymbol
Horizontal sync maximum cycle 50
Horizontal sync maximum cycle 60
Horizontal sync minimum cycle 50
Horizontal sync minimum cycle 60
Horizontal blanking peak value
Horizontal blanking pulse width 50
Horizontal blanking pulse width 60
Horizontal blanking pulse width
Horizontal output voltage H
Horizontal output voltage M
Horizontal output voltage L
Vertical external trigger load resistance
Vertical automatic sync stop voltage
Vertical AFC gate release voltage
Horizontal output start VCC voltage
Vertical free-run frequency deviation
Dependence of vertical free-run frequency
on VCC
Vertical pull-in range
Vertical output start VCC voltage
AFC2 FBP peak value H
AFC2 FBP peak value M
AFC2 FBP peak value L
Vertical output pulse width
Vertical output phase max
Vertical output phase center
Vertical output phase min
Burst gate pulse width
Burst gate pulse phase
50/60 output voltage 50
50/60 output voltage 60
50/60 input voltage 50
50/60 input voltage 60
SECAM V pulse peak value
SECAM V pulse width
TV MAX50
TV MAX60
TV MIN50
TV MIN60
VHVBL
PWBLK50
PWBLK60
PWVOUT
VOUTH
VOUTM
VOUTL
RTR
VSAS
VGS
SVV
∆fH
∆fH/VCC
fHPULL
SHV
FBPH
FBPM
FBPL
PWHOUT
HPMAX
HPCEN
HPMIN
PWBGP
TdBGP
V50
V60
VIN50
VIN60
SVH
SVW
LA7688B
Conditions
Vertical sync signal only
Vertical sync signal only
Package Dimensions
unit : mm
3128
min t
356.5
296.5
268.5
224.5
23
19
8
5.3
4.0
Ratings
yp
357
297
269
225
0.6
23.5
19.5
8.5
5.6
4.3
3.0
-150
±450
6.0
3.2
-0.3
21.8
14
4.8
3
-0.2
3.8
0.5
4.7
1.4
2.0
4.2
0
2
4.8
6.5
3.7
0.2
23.8
17
5.8
3.8
4
0.3
1.1
4.1
1.8
11.0
2.2
11.5
max
357.5
297.5
269.5
225.5
1.0
24
20
9
5.9
4.6
0.3
1.9
2.5
4.7
150
5.2
7.0
4.2
0.7
25.8
6.8
4.8
5
0.8
1.5
7.0
2.6
12.0
Unit
H
H
H
H
V
H
H
H
V
V
V
kΩ
V
V
V
Hz
Hz
Hz
V
V
V
V
µs
µs
µs
µs
µs
µs
V
V
V
V
V
H
No.0077-5/20
5 Page 
Continued from preceding page.
Parameter S
ymbol
SIF signal level
Sout
[AUDIO SW block]
AF EXT gain
GAF
AF EXT distortion
THDAF
Test
point
TPO-8
TPO-51
TPO-51
LA7688B
Input
symbol
SG1
fp = 38.9MHz
cw 80dBµ
SG2
fp = 33.4MHz
cw 60dBµ
SG1
fo = 400Hz
Vf = 500mVrms
SG1
fo = 400Hz
Vf = 500mVrms
Test method
Mix SG1 and SG2 and enter the mixed
signal to VIF IN.
Connect the spectrum analyzer to
TPO-8 and measure the 5.5MHz level.
Applied voltage (V)
TPO-2 T
PZ-46
VR center
OPEN
Apply the DC voltage so that I-1A
becomes EXT.
Enter SG1 from Z-12 and connect the
AC voltmeter to TPO-51.
Measure the 400Hz level and set it as
V51.
GAF = 20log V51/500mVrms
Apply the DC voltage so that I-1A
becomes EXT.
Enter SGI from Z-12 and connect a
distortion factor meter to TPO-51.
Measure the distortion factor in this
case.
B.P.F 20Hz to 20kHz
VR center
VR center
7.8V
7.8V
Description of LA7688B chroma block input waveforms
1. The color bar signals which are input from pin 10 and pin 14 are a standard composite video signal.
(1) Color bar : 0dB
Composite video signal with 1Vp-p color bar
(2) Monochrome signal
[PAL] SYNC : 0.3Vp-p Burst : 300mVp-p Chroma : 600mVp-p
[NTSC] SYNC : 0.3Vp-p Burst : 286mVp-p Chroma : 572mVp-p
(3) Burst only
Signal obtained by eliminating the chroma component from the signal of (2)
(4) 8-division signal
No.0077-11/20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LA7688B.PDF ] | |
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