Page 1
Overview
The LA7688 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.
Features
[VIF] • PLL detector • Buzz canceller
[SIF] • PLL detector • Audio switch
[VIDEO] • Built-in trap • Built-in DL
• Aperture control
• Video switch (SVO output)
• Black expansion
[CHROMA] • PAL/NT • Base band processing
(adjustment free)
• Built-in bandpass filter
[OSD] • Analog OSD
[DEF] • Automatic 50/60 Hz discrimination
• Fixed vertical size • Double AFC
• Built-in sync separator circuit
[Other features] • Sandcastle pulse (for the 1H delay line)
• fsc output (for SECAM systems)
• Primary color output
Package Dimensions
unit: mm
3218-DIP52S
Monolithic Linear IC
Ordering number : EN5635
82097HA(OT) No. 5635-1/6
SANYO: DIP52S
[LA7688]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
Single-Chip CTV Signal-Processing Circuit
for PAL and NTSC Formats
LA7688
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage
V
40
max 9V
V
45
max 9V
Maximum supply current I
24
max 16 mA
FBP input current
I
26
max 5mA
I
32
max 10 mA
FBP input voltage I
26
min –5 V
Allowable power dissipation Pd max Ta ≤ 65°C When mounted on a printed circuit board* 1.3 W
Operating temperature Topr –10 to +65 °C
Storage temperature Tstg –55 to +150 °C
Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage
V
40
7.6 V
V
45
7.6 V
Recommended supply current I24 12 mA
Operating voltage range
V
40
op 7 to 8.2 V
V
45
op 7 to 8.2 V
Operating current range I
24
op 10 to 16 mA
Operating Conditions at Ta = 25°C
Note : * Printed circuit board size: 83 × 86 × 1.5 mm, material: Bakelite
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No. 5635-2/6
LA7688
Parameter Symbol Conditions
Ratings
Unit
min typ max
[Circuit Voltages and Currents]
Horizontal power-supply voltage V
CC
H Deflection system (V24) 6.4 6.9 7.4 V
Current drain
I
40
78 90 100 mA
I
45
34 40 48 mA
[VIF Block]
RF AGC maximum voltage V
50H
7.5 7.8 7.8 V
RF AGC minimum voltage V
50L
0.2 0.6 V
Input sensitivity V
i
39 45 dBµ
AGC range GR 56 60 dB
Maximum allowable input V
IN max
95 100 dBµ
Quiescent video output voltage V
8
4.1 4.4 4.7 V
Synchronizing signal tip voltage V
8tip
1.7 2.0 2.3 V
Video output amplitude V
O
1.7 2.0 2.3 Vp-p
Black noise threshold voltage V
BTH
1.0 1.3 1.7 V
Black noise clamp voltage V
BCL
2.7 3.0 3.3 V
Output signal-to-noise ratio S/N 48 52 dB
1.07 MHz beat level C/S 40 44 dB
Frequency characteristics f
C
6 9 MHz
Differential gain DG 5 10 %
Differential phase DP 6 10 deg
Quiescent AFT voltage V
7
3.6 3.9 4.2 V
Maximum AFT voltage V
7H
7.3 7.6 7.8 V
Minimum AFT voltage V
7L
0 0.3 0.7 V
AFT detection sensitivity Sf 10 15 20 mV/kHz
VIF input resistance Ri f = 38.9 MHz 1.0 1.3 1.6 kΩ
VIF input capacitance Ci f = 38.9 MHz 2 3 5 pF
APC pull-in range (U) f
PU
0.8 2.0 MHz
APC pull-in range (L) f
PL
–2 –0.8 MHz
VCO1 maximum variation range
∆
fU1
0.8 2.0 MHz
∆
fL1
–2.0 –0.8 MHz
SIF signal level S
OUT
110 140 170 mVrms
VCO1 control sensitivity ß 2.4 4.8 9.6 kHz
[SIF Block]
SIF limiting sensitivity V
i
(lim) 40 46 52 dBµ
FM detector output voltage V
O
(FM) 390 500 710 mVrms
AMR AMR 40 60 dB
Total harmonic distortion THD 0.3 1.0 %
SIF S/N S/N (SIF) 55 62 dB
FM detector range (L) W
FML
2.5 4.0 MHz
FM detector range (H) W
FMH
7.0 8.0 MHz
FM detector output variability ∆V
O
0 2.0 3.0 dB
[INT/EXT Switching Block]
AFT EXT gain G
AF
–0.7 –0.2 +0.3 dB
AFT EXT distortion THD
AF
0.03 0.5 %
System switch I-SE V1
TH1
Notes: 0 1.2 V
System switch I-P/N V1
TH2
I = INT, E = EXT 1.7 2.6 V
System switch E-P/N V1
TH3
P/N = PAL/NTSC 2.9 3.8 V
System switch E-SE V1
TH4
SE = SECAM 4.1 5 V
[Video Switching Block]
Video signal input 1 DC voltage V
10DC
3.2 3.5 3.8 V
Video signal input 1 AC voltage V
10AC
1.0 Vp-p
Video signal input 2 DC voltage V
14DC
3.2 3.5 3.8 V
Video signal input 2 AC voltage V
14AC
1.0 Vp-p
SVO pin DC voltage V
16DC
2.5 2.8 3.1 V
SVO pin AC voltage V
16AC
1.7 2.0 2.3 Vp-p
Operating Characteristics at Ta = 25°C, V
CC40, 45
= 7.8 V, I24= 12 mA
Continued on next page.
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No. 5635-3/6
LA7688
Continued from preceding page.
Parameter Symbol Conditions
Ratings
Unit
min typ max
[Filter Block]
Filter automatic adjustment open voltage V
9OPNfSC
= 4.43 MHz 3.3 3.8 4.3 V
S input threshold V
9TH
1.5 2.0 2.5 V
C-TRAP G
TRAP
–20 –26 –32 dB
C-BPF1 G
BPF1
–5 –3 –1 dB
C-BPF2 G
BPF2
–2 –1 0 dB
C-BPF3 G
BPF3
–6 –4 –2 dB
Y-DL TIME1 T
dy1
PAL 400 450 500 ns
Y-DL TIME2 T
dy2
NTSC 410 460 510 ns
Y-DL TIME3 T
dy3
S (PAL) 230 280 330 ns
Y-DL TIME4 T
dy4
SECAM 510 560 610 ns
[Video Block]
Contrast center E
CCEN
1.0 1.2 1.4 Vp-p
Contrast variation range dGC 18 22 26 dB
Brightness minimum (0.5 V) VB min 0.4 0.7 1.0 V
Brightness typical (2.5 V) VB typ 1.9 2.2 2.5 V
Brightness maximum (4.5 V) VB max 3.4 3.7 4.0 V
Soft control characteristics dG
SOFT
–6.0 –4.0 –2.0 dB
Sharp control characteristics dG
SHARP
4.5 7.5 10.5 dB
Y signal frequency characteristics (1) BW1 S-VHS 3.9 4.4 4.9 MHz
Y signal frequency characteristics (2) BW2 PAL 3.0 3.35 3.7 MHz
Y signal frequency characteristics (3) BW3 NTSC 2.5 2.85 3.2 MHz
DC transmission ratio dVAPL 100 %
Black expansion threshold BS
TH
40 50 60 IRE
Black expansion maximum gain BSmax –20 –13 –6 IRE
[Chrominance Common]
R-Y output DC voltage V
39DC
3.6 4.0 4.4 V
R-Y output AC voltage E
39AC
0.45 0.60 0.75 Vp-p
B-Y output DC voltage V
38DC
3.6 4.0 4.4 V
B-Y output AC voltage E
38AC
0.35 0.5 0.65 Vp-p
R-Y input DC voltage V
37DC
4.2 4.6 5.0 V
R-Y input AC voltage E
37AC
0.45 0.60 0.75 Vp-p
R-Y input AC range E
37ALC
160 200 250 mVp-p
B-Y input DC voltage V
36DC
4.2 4.6 5.0 V
B-Y input AC voltage E
36AC
0.35 0.5 0.65 Vp-p
B-Y input AC range E
36ALC
160 200 250 mVp-p
Residual color E
CMIN
200 mVp-p
Contrast color amplitude characteristics dG
CC
30 35 40 dB
RGB output DC difference voltage dVC With no chrominance signal input –0.3 0 +0.3 V
RGB output DC voltage temperature
∂VC/∂T With no chrominance signal input 0 mV/°C
characteristics
RGB output residual high-frequency level E car 0.2 Vp-p
RGB output residual carrier level e car With no chrominance signal input 0.3 Vp-p
fSC output pin DC voltage V
27OPN
4.5 5.0 5.3 V
fSC output level P V
27ACP
PAL 0.14 0.2 0.26 Vp-p
fSC output level N V
27ACN
NTSC 0.19 0.26 0.33 Vp-p
DEF COIN-L V
27LO
1.0 1.3 1.6 V
Crystal switching threshold V
27TH
400 µA
PAL switching threshold V
18PTH
0.6 V
NT switching threshold V
18NTH
0.9 V
Continued from preceding page.
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No. 5635-4/6
LA7688
Continued from preceding page.
Parameter Symbol Conditions
Ratings
Unit
min typ max
[Chrominance System PAL Block]
ACC amplitude characteristics 1 ACC1p –2 +1 +4 dB
ACC amplitude characteristics 2 ACC2p –4 0 +2 dB
Killer operating point E KILp –37 –30 –25 dB
Killer hysteresis dE KILp 1 3 7 dB
RGB output level E Bp Chrominance: 50%, color: typical 4.1 4.6 5.1 Vp-p
Maximum RGB output EBmaxp Chrominance: 50%, color: maximum 5.4 5.9 6.4 Vp-p
APC pull-in range
+
df scp
+
500 Hz
APC pull-in range
–
df scp
–
–500 Hz
Demodulated output ratio B/R B/Rp 1.50 1.78 2.00 double
Demodulated output ratio G/R G/Rp With no B-Y signal –0.56 –0.51 –0.46 double
Demodulated output ratio G/B G/Bp With no R-Y signal –0.21 –0.91 –0.17 double
Demodulation angle RBp 85 90 95 deg
[Chrominance System NTSC Block]
ACC amplitude characteristics 1 ACC1n –2 +1 +4 dB
ACC amplitude characteristics 2 ACC2n –4 0 +2 dB
ACC phase characteristics 1 PCC1n –3 0 +3 deg
ACC phase characteristics 2 PCC2n –5 0 +5 deg
Killer operating point E KILn –40 –34 –29 dB
Killer hysteresis dE KILn 1 4 8 dB
RGB output level E Bn Chrominance: 50%, color: typical 3.4 3.9 4.4 Vp-p
Maximum RGB output EBmaxn Chrominance: 50%, color: maximum 5.0 5.5 6.0 Vp-p
APC pull-in range
+
df scn
+
350 Hz
APC pull-in range – df scn
–
–350 Hz
Tint control variation range dP TI –33 +50 deg
Demodulated output ratio R R/Bn 0.81 0.90 0.99 double
Demodulated output ratio G G/Bn 0.24 0.30 0.36 double
Demodulation angle RB RBn 95 105 115 deg
Demodulation angle GB GBn –130 –120 –110 deg
[RGB Block]
OSD input level E
OSD
Standard input, 100% white level 0.7 Vp-p
OSD input DC voltage V
OSD
With no signal 2.9 3.2 3.5 V
F-BLK input threshold level V
28TH
0.8 1.0 1.2 V
OSD output pedestal level difference V
OSDC
–0.3 0 +0.3 Vp-p
OSD output maximum E
OSD
max 4.3 4.8 5.3 Vp-p
OSD output minimum E
OSD
min 0.3 0.6 0.9 Vp-p
Character signal output frequency
BW
OSD
5 7 MHz
characteristics
TV-OSD crosstalk (C-Y) CT
TVC
50 dB
OSD-TV crosstalk (C-Y) CT
OSDC
40 dB
Character signal inter-character crosstalk CT
OSD
30 dB
[DEF Block]
Vertical free-running period 50 TV
FREE50
312.0 312.5 313.0 H
Vertical free-running period 60 TV
FREE60
262.0 262.5 263.0 H
Vertical synchronization maximum period 50 TVmax50 Horizontal synchronizing signal only 356.5 357.0 357.5 H
Vertical synchronization maximum period 60 TVmax60 Horizontal synchronizing signal only 296.5 297.0 297.5 H
Vertical synchronization minimum period 50 TVmin50 268.5 269.0 269.5 H
Vertical synchronization minimum period 60 TVmin60 224.5 225.0 225.5 H
Vertical blanking peak value V
HVBL
0.6 1.0 V
Vertical blanking pulse width 50 PW
BLK50
23 23.5 24 H
Vertical blanking pulse width 60 PW
BLK60
19 19.5 20 H
Vertical output pulse width PW
VOUT
8.0 8.5 9.0 H
Vertical output voltage H V
OUTH
5.3 5.6 5.9 V
Vertical output voltage M V
OUTM
4.0 4.3 4.6 V
Vertical output voltage L V
OUTL
0.3 V
Continued on next page.
Page 5
No. 5635-5/6
LA7688
Continued from preceding page.
Parameter Symbol Conditions
Ratings
Unit
min typ max
Vertical external trigger load resistance RTR 3.0 4.7 kΩ
Vertical automatic synchronization stop voltage V
SAS
1.4 1.9 V
Horizontal AFC gate release voltage V
GS
2.0 2.5 V
Vertical output start V
CC
voltage SVV 4.2 4.7 V
Horizontal free-running deviation ∆f
H
–150 0 +150 Hz
Horizontal free-running frequency V
CC
∆fH/V
CC
2 Hz
dependence
Horizontal pull-in range f
HPLL
±450 Hz
Horizontal output start V
CC
voltage S
HV
4.8 5.2 V
AFC2 FBP peak value H F
BPH
6.0 6.5 7.0 V
AFC2 FBP peak value M F
BPM
3.2 3.7 4.2 V
AFC2 FBP peak value L F
BPL
–0.3 +0.2 +0.7 V
Horizontal output pulse width P
WHOUT
21.8 23.8 25.8 µs
Horizontal output phase maximum HPmax 14 17 µs
Horizontal output phase center HPcen 4.8 5.8 6.8 µs
Horizontal output phase minimum HPmin 3.8 4.8 µs
Burst gate pulse width PW
BGP
3 4 5 µs
Burst gate pulse phase Td
BGP
–0.2 +0.3 +0.8 µs
50/60 Hz output voltage 50 V50 1.1 1.5 V
50/60 Hz output voltage 60 V60 3.8 4.1 V
50/60 Hz input voltage 50 V
IN
50 0.5 V
50/60 Hz input voltage 60 V
IN
60 7.0 V
SECAM V pulse peak value SVH 1.8 2.2 2.6 V
SECAM V pulse width SVW 11.0 11.5 12.0 H
Page 6
No. 5635-6/6
LA7688
This catalog provides information as of August, 1997. Specifications and information herein are subject to
change without notice.
■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
■ Anyone purchasing any products described or contained herein for an above-mentioned use shall:
➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
■ Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
Test Circuit
LC4528
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