Overview
The LA75665M is a VIF/SIF IC that supports PAL and
NTSC multisound and that adopts a semi-adjustment-free
system. To simplify adjustment, the VIF block adopts a
technique in which AFT adjustment is no longer required
by VCO adjustment. The SIF block supports audio multi-
detection by adopting a PLL detection technique. The SIF
block provides 4 inputs with IC internal switching for easy
design of multi-sound systems. Additionally, these
switches can also be used for video system sound trap
switching. The LA7566 also includes a buzz canceller that
suppresses Nyquist buzz to achieve improved audio
quality.
Features
No coils are used in the AFT and SIF blocks, making
these circuits adjustment free.
PAL / NTSC multisound system can be constructed
easily.
Built-in buzz canceller for excellent audio performance
Functions
[VIF Block]
VIF amplifier
PLL detector
BNC
RF AGC
EQ amplifier
AFT
IF AGC
Buzz canceller
[First SIF Block]
First SIF amplifier
First SIF detector
AGC
[SIF Block]
Multiple input switch
Limiter amplifier
PLL FM detector
Package Dimensions
unit: mm
3112-MFP24S
Monolithic Linear IC
N3099TH (OT) No. 6227-1/12
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
VIF/SIF IF Signal-Processing Circuit with TV/VCR PAL
and NTSC Multisound Support
LA75665M
Ordering number : ENN6227A
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft's
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
1
12
24
13
12.6
0.8
1.0
0.15
0.35
5.4
6.35
7.6
0.625
1.8max
1.5
0.1
SANYO: MFP24S
[LA75665M]
No. 6227-2/12
LA75665M
100
0
200
300
400
420
500
600
700
720
800
20
0
20
40
60
70
80
100
Pd max -- Ta
Ambient temperature, Ta -- C
Allowable power dissipation, Pd max -- mW
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
6
V
Circuit voltage
V7, V10,
V
CC
V
I1
2
mA
Circuit current
I13
3
mA
I18
10
mA
Allowable power dissipation
Pd max
Ta
50C, independent IC
420
mW
When mounted on a printed circuit board
*
720
mW
Operating temperature
Topr
20 to +70
C
Storage temperature
Tstg
55 to +150
C
Specifications
Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Recommended supply voltage
V
CC
5
V
Operating supply voltage range
V
CC
op
4.6 to 5.5
V
Operating Conditions
at Ta = 25C
Note:
*
Size: 65
72
1.6 mm
3
, Material: paper/phenol composite
Independent IC
With substrate (65
72
1.6 mm
3)
No. 6227-3/12
LA75665M
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
[VIF Block]
Circuit current
I3
39
46
53
mA
Maximum RF AGC voltage
V9H
4.5
4.9
V
Minimum RF AGC voltage
V9L
0
0.5
V
Input sensitivity
V
IN
S1 = OFF
29
35
41
dBV
AGC range
G
R
45
50
dB
Maximum allowable input
V
IN
max
95
100
dBV
No-signal video output voltage
V13
3.2
3.5
3.8
V
Sync tip voltage
V13 tip
0.8
1.0
1.2
V
Video output level
V
O
1.75
2.1
2.42
Vp-p
Black noise threshold voltage
V
BTH
0.3
0.6
0.9
V
Black noise clamp voltage
V
BCL
1.5
1.8
2.1
V
Video signal-to-noise ratio
S/N
48
52
dB
C-S beat
IC-S
44
49
dB
Frequency characteristics
f
C
6 MHz
3
1.5
dB
Differential gain
DG
3
8
%
Differential phase
DP
3
8
deg
AFT voltage with no input signal
V10
4
4.5
5.0
V
Maximum AFT voltage
V10H
4.2
4.8
5.0
V
Minimum AFT voltage
V10L
0
0.1
0.2
V
AFT detection sensitivity
Sf
19
25
32
mV/kHz
VIF input resistance
Ri
38.9 MHz
1.5
k
VIF input capacitance
Ci
38.9 MHz
3
pF
APC pull-in range (U)
f
PU
1.0
1.5
MHz
APC pull-in range (L)
f
PL
1.5
0.8
MHz
AFT tolerance frequency 1
dfa1
200
0
+200
kHz
VCO 1 maximum variability range (U)
dfu
1.3
1.5
MHz
VCO 1 maximum variability range (L)
dfl
1.5
0.75
MHz
VCO control sensitivity
B
1.25
2.3
5.0
kHz/mV
Drift when the AFT switch is on
Drift
3
s
[First SIF Block]
Conversion gain
VG
28
31
34
dB
5.5 MHz output level
S
O
125
177
251
mVrms
Maximum first SIF input
S
IN
max
500
1000
mVrms
First SIF input resistance
R
IN
(SIF)
33.4 MHz
2
k
First SIF input capacitance
C
IN
(SIF)
33.4 MHz
3
pF
[SIF Block]
Limiting sensitivity
VIi(lim)
36
42
dBV
FM detector output voltage
V
O
(FM)
5.5 MHz 30 kHz
450
570
720
mVrms
AM rejection ratio
AMR
50
60
dB
Total harmonic distortion
THD
0.2
1.5
%
SIF S/N
S/N (FM)
55
60
dB
FM detector output DC voltage
FMDC
1.9
2.2
2.5
V
[SIF Switch Block] Switches A, B, and C: H = open, L = ground
NTSC mode 6-dB amplifier
NTSW
5
6
7
dB
SIF crosstalk 21
CT21
51
57
dB
SIF crosstalk 22
CT22
51
57
dB
SIF crosstalk 23
CT23
51
57
dB
SIF crosstalk 24
CT24
51
57
dB
Switch threshold low-level voltage
SW (L)
1.0
1.5
2.0
V
Operating Characteristics
at Ta = 25C, V
CC
= 5 V, fp = 38.9 MHz
Pin Assignment
No. 6227-4/12
LA75665M
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
FM DET OUT
SIF FILTER
V
CC
GND
VIF IN
VIF IN
IFAGC
1st SIF IN
RFAGC OUT
AFT OUT
VCO COIL
VCO COIL
VIDEO OUT
EQ FILTER
PAL VIDEO IN
NT VIDEO IN
APC
COMP OUT
1st SIF OUT
FM FILTER
SIF IN (4.5MHz)
SIF IN (5.5MHz)
SIF IN (6.0MHz)
SIF IN (6.5MHz) /RFAGC VR
A12481
LA75665M
Top view
Application Circuit Diagram
H : OPEN
L : GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
+
+
+
+
0.01
F
1
F
100
F
0.01
F
0.022
F
0.01
F
30 k
150
2.2 k
2.2 k
5.1 k
2.2 k
150
560
330
330
15
H
8.2
H
4.5 MHz
4.5 MHz
330
5.5 MHz
330
6.0 MHz
330
6.5 MHz
5.5 MHz, 6.0 MHz, 6.5 MHz
0.01
F
0.47
F
1
F
30 pF
47
H
0.01
F
0.01
F
0.01
F
100 k
100 k
3 k
2.2 k
AUDIO
OUT
RFAGC
OUT
AFT
OUT
VIDEO
OUT
C
B
A
VCC
SAW(P)
SAW
(S)
A12482
FM
DET
AFT
VCO
RF
AGC
IF
AGC
F
VIDEO
DET
LIM
AMP
VIF
1ST SIF
DET
EQ
AMP
INPUT SW
1ST
AMP
Switch
5.5 MHz
6.0 MHz
6.5 MHz
4.5 MHz
A
B
C
H
H
H
q
q
H
H
L
q
q
H
L
H
q
q
H
L
L
q
q
L
H
H
q
q
q
q
q
q
L
L
L
q
q
q
q
q
q
q
q
L
H
L
q
q
q
q
L
L
H
q
q
q
q
Internal Equivalent Circuit Diagram
No. 6227-5/12
LA75665M
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
+
+
+
+
0.01
F
1
F
100
F
0.01
F
0.022
F
0.01
F
30 k
150
2.2 k
2.2 k
1 k
2 k
2 k
1 k
1 k
2 k
200
200
1 k
1 k
1 k
1 k
2 k
1.5 k
2.5 k
15 k
15 k
15 k
15 k
100
100
28 k
100
28 k
28 k
100
28 k
3.6 V
1.5 k
2.2 k
5.1 k
150
560
330
330
330
330
2 k
1 k
1 k
100
1 k
1.2 k
1.2 k
2.5 k
9.2 k
1 k
2 pF
15 pF
10 k
1 k
2 k
330
15
H
8.2
H
4.5 MHz
4.5 MHz
5.5 MHz
6.0 MHz
6.5 MHz
5.5 MHz, 6.0 MHz, 6.5 MHz
0.01
F
0.47
F
1
F
47
H
30 pF
0.01
F
0.01
F
0.01
F
50 k
-B
100 k
100 k
3 k
2.2 k
AUDIO
OUT
RFAGC
OUT
VCO COIL
AFT
OUT
VIDEO
OUT
C
B
A
V
CC
SAW (P)
SAW
(S)
A12483
AC Characteristics Test Circuit Diagram
No. 6227-6/12
LA75665M
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
+
+
+
0.01
F
(M)
1
F
100
F
0.01
F
51
5.1 k
51
30 k
GND
VIF IN
1ST SIF IN
VCC
GND
MA6389
RFAGC
OUT
(F)
VIDEO
OUT
(A)
1st SIF OUT
(C)
2nd SIF IN
AFT
OUT
(B)
IF AGC
0.022
F
100 k
S1
330
330
0.01
F
0.01
F
150
560
51
0.47
F
+
1
F
0.01
F
0.01
F
0.01
F
0.01
F
100 k
100 k
FM DET OUT
(D)
SWA
SWB
SWC
A12484
FM
DET
AFT
VCO
RF
AGC
IF
AGC
F
VIDEO
DET
LIM
AMP
VIF
AMP
1ST SIF
DET
EQ
AMP
INPUT SW
1ST
AMP
0.01
F
0.01
F
1000 pF
51
51
51
RF
vr 20K-B
Input Impedance Test Circuit Diagram
(VIF and first SIF input impedance)
1
24
23
22
21
20
19
18
17
16
15
14
13
2
3
4
5
6
7
8
9
10
11
12
+
0.01
F
0.01
F
0.01
F
0.01
F
0.01
F
0.01
F
0.01
F
100
F
0.01
F
100k
100k
330
330
10k
0.01
F
0.01
F
0.01
F
VIF IN
VCC
1st SIF IN
A12485
LA75665M
Impedance analyzer
No. 6227-7/12
LA75665M
Pin No.
Symbol
Pin function
Equivalent circuit
Pin Functions
1
FM DET OUT
Audio FM detector output
This circuit includes an internal 300
resistor in series with the
emitter-follower output.
Stereo applications
The input impedance may be reduced according to the
applications that input this signal to a stereo decoder. This can
result in distortion in the left and right signals and a degradation
of the stereo characteristics. If this problem occurs, add a
resistor between pin 24 and ground.
R1
5.1 k
Mono applications
Forms an external deemphasis circuit.
t = CR2
A12486
R2
300
10 k
C
R1
1
2
SIF FILTER
Connection for a filter that holds the FM detector output DC
voltage at a fixed level. Normally, a 1-F electrolytic capacitor is
used. To improve the low band (around 50 Hz) frequency
characteristics, increase the value of this capacitor (C1).
The FM detector output level can be reduced and the FM
dynamic range increased by inserting this resistor in series with
the capacitor.
2
+
1 k
1 k
C1
R
A12487
5
6
VIF IN
VIF amplifier input.
The input circuit is constructed as a balanced input, and the
input has the following impedance characteristics:
R
1.5 k
C
3 pF
5
6
1 k
1 k
A12488
Continued on next page.
No. 6227-8/12
LA75665M
Continued from preceding page.
Pin No.
Symbol
Pin function
Equivalent circuit
7
IF AGC
IF AGC filter connection.
The AGC voltage is created at pin 7 from the signal to which
peak detection was applied by the internal AGC detector.
Additionally, the IC includes an internal second AGC filter (a
lag-lead filter) used to create a dual time constant. A 0.022 F
capacitor is used as the external capacitor. The value of this
capacitor must be adjusted according to measurement of the
sag, AGC speed, and other circuit aspects.
7
C1
2 k
1 k
10 k
A12489
8
1st SIF IN
First SIF input.
A DC cut capacitor must be inserted in the input to this circuit.
When a SAW filter is used: The first SIF sensitivity can be
increased by inserting an inductor between the SAW and the IC
to match the SAW output and IC input capacitances.
When an intercarrier system is used: This pin must be
connected to ground through a capacitor.
8
A12490
2 k
2 k
9
RF AGC OUT
RF AGC output.
This output controls the tuner RF AGC. This is an open-
collector output with an inserted 100-
protective resistor.
Determine the value of the external bleeder resistor to match
the tuner specifications.
9
A12491
VCC
100
3 pF
500
10
AFT OUT
AFT output.
The AFT center voltage is created with an external bleeder
resistor. The AFT gain increases as the value of this bleeder
resistor increases. The value of this resistor must not exceed
390 k
. This circuit includes a control function that controls the
AFT voltage to be equal to the center voltage in weak field
reception conditions.
10
1 k
A12492
Continued on next page.
No. 6227-9/12
LA75665M
Continued from preceding page.
Pin No.
Symbol
Pin function
Equivalent circuit
11
12
VCO
VCO tank circuit used for video detection.
See the separately provided documentation for the tank circuit
coil (inductor) specifications.
12
11
1.2 k
1.2 k
A12493
13
14
VIDEO OUT
EQ FILTER
Equalizer circuit. This circuit corrects the video signal frequency
characteristics.
Notes on equalizer amplifier design:
The equalizer amplifier is designed as a voltage follower
amplifier with a gain of about 2.3 dB. When the frequency
characteristics are corrected, connect an inductor, a capacitor,
and a resistor in series between pin 14 and ground.
The equalizer amplifier gain is given by:
R1
AV = ---- + 1
Z
Here, R1 is an IC internal resistor with a value of 1 k
. Select Z
according to the desired characteristics. However, care is
required to prevent distortion at the resonant point determined
by Z, where the gain is maximum.
13
14
2 k
1 k
9.2 k
C
Z
L
R
A12494
15
16
PAL VIDEO IN
NT VIDEO IN
Equalizer amplifier inputs.
Pin 15 is for PAL, and pin 16 for NTSC format signals. These
inputs are linked to and switched by the SIF switches.
15
16
200
200
A12495
17
APC FILTER
PLL detector APC filter connection.
The APC time constants are switched internally in the IC. When
locked, the VCO is controlled over the path A, and the loop gain
is reduced. When unlocked and during weak field reception, the
VCO is controlled over the path B, thus increasing the loop
gain.
We recommend values of:
R = 150 to 390
, and
C = 0.47 F
for the loop filter constants.
17
A12496
FRO
APC
A
B
1 k
1 k
1 k
Continued on next page.
No. 6227-10/12
LA75665M
Continued from preceding page.
Pin No.
Symbol
Pin function
Equivalent circuit
18
COMP OUT
Output for the video signal that includes the SIF carrier.
A resistor must be inserted between pin 18 and ground to
acquire an adequate drive capability.
R
470
18
A12497
1.5 k
2 k
2pF
1 K
15pF
19
1st SIF OUT
First SIF output
The signal output from this pin is passed through a bandpass
filter and input to the SIF circuit. This is an emitter-follower
output.
19
1 k
A12498
20
FM FILTER
The FM detector signal-to-noise ratio can be improved by
inserting a filter in the FM detector bias line.
C1 should have a value of 0.47 F or greater, and 1 F is
recommended .
If the FM detector is not used, pin 20 must be connected to
ground through a 2-k
resistor. This stops the FM detector
VCO circuit.
20
+
A12499
C1
2.5 k
1.5 k
21
22
23
24
SIF IN (4.5 MHz)
SIF IN (5.5 MHz)
SIF IN (6.0 MHz)
SIF IN (6.5 MHz)
RF AGC VR
SIF inputs.
Four input pins are provided to support multi-side systems, and
a switching function is also included. Since buzzing and bass
beating can occur if interference signals, such as the video
signal or the chrominance signal, enter these pins, extra care
must be taken in designing the input circuit pattern layout. Note
that pin 24 also functions as the RF AGC adjustment pin. This
pin sets the tuner RF AGC operating point. Also, the FM output
and the video output can be muted at the same time by setting
this pin to the ground level.
21
22
23
24
28 k
4.5MEG
SWA
SWB
SWC
VCC
VBGZ=3.6
5.5MEG
6.0MEG
6.5MEG
30 k
12 k
30 k
28 k
15 k
11 k
11 k
11 k
15 k
100
100
100
100
28 k
30 k
28 k
A12500
Switch
5.5 MHz
6.0 MHz
6.5 MHz
4.5 MHz
A
B
C
H
H
H
q
q
H
H
L
q
q
H
L
H
q
q
H
L
L
q
q
L
H
H
q
q
q
q
q
q
L
L
L
q
q
q
q
q
q
q
q
L
H
L
q
q
q
q
L
L
H
q
q
q
q
Notes on Sanyo SAW Filters
There are two types of SAW filters, which differ in the piezoelectric substrate material, as follows:
1. Lithium tantalate (LiTaO3) SAW filter
TSF11
s
s s
s
Japan
TSF12
s
s s
s
US
Although lithium tantalate SAW filters have the low temperature coefficient of 18 ppm/C, they suffer from a large
insertion loss. However, it is possible, at the cost of increasing the number of external components required, to minimize
this insertion loss by using a matching circuit consisting of coils and other components at the SAW filter output. At the
same time as minimizing insertion loss, this technique also allows the frequency characteristics, level, and other aspects
to be varied, and thus provides increased circuit design flexibility. Also, since the SAW filter reflected wave level is
minimal, the circuit can be designed with a small in-band ripple level.
2. Lithium niobate (LiNbO3) SAW filter
TSF52
s
s s
s
US
TSF53
s
s s
s
PAL
Although lithium niobate SAW filters have the high temperature coefficient of 72 ppm/C, they feature an insertion loss
about 10 dB lower than that of lithium tantalate SAW filters. Accordingly, there is no need for a matching circuit at the
SAW filter output. Although the in-band ripple is somewhat larger than with lithium tantalate SAW filters, since they
have a low impedance and a small field slew, they are relatively immune to influences from peripheral circuit
components and the geometry of the printed circuit board pattern. This allows stable out-of-band trap characteristics to be
acquired. Due to the above considerations, lithium tantalate SAW filters are used in applications for the US and Japan
that have a high IF frequency, and lithium niobate SAW filters are used in PAL and US applications that have a low IF
frequency.
Notes on SAW Filter Matching
In SAW filter input circuit matching, rather than matching the IF frequency, flatter video band characteristics can be
acquired by designing the tuning point to be in the vicinity of the audio carrier rather than near the chrominance carrier.
The situation shown in figure on the right makes it easier to acquire flat band characteristics than that in figure on the left.
No. 6227-11/12
LA75665M
A12501
Frequency
Tokyo Parts Industrial Co., Ltd. 236 Hinode Machi Isesaki Shi, Gunma Prefecture Japan TEL: +81-270-23-3731
Coil Specifications
JAPAN f = 58.75 MHz
US f = 45.75 MHz
PAL f = 38.9 MHz
VCO coils
Test production No. 16991A
Test production No. 16687A
Test production No. 16686A
Tokyo Parts Industrial Co., Ltd.
Tokyo Parts Industrial Co., Ltd.
Tokyo Parts Industrial Co., Ltd.
Picture
Picture
Picture
SAW filters (split)
TSF1137U
TSF1241
TSF5315
SOUND
SOUND
SOUND
SAW filters (inter)
TSF5220
TSF5321
TSF5221
TSF5344
S
t = 5 t
0.12
C = 27 pF
A12502
S
t = 6 t
0.12
C = 39 pF
A12503
S
t = 7 t
0.12
C = 39 pF
A12504
SAW filter characteristics
The high-band is reduced
The high-band is
extended
Frequency
With the tuning set to the IF frequency
With the tuning set to the vicinity of S and C
PS No. 6227-12/12
LA75665M
Notes on VCO Tank Circuits
1. Built-in capacitor VCO tank circuits
When the power is turned on, the heat generated by the IC is transmitted through the printed circuit board to the VCO
tank circuit. At this point, the VCO coil frame functions as a heat sink and the IC heat is dissipated. As a result, it
becomes more difficult to transmit heat to the VCO tank cricuit's built-in capacitor, and the influence of drift at power
on is reduced. Therefore, it suffices to design the circuit so that the coil and capacitor thermal characteristics cancel.
Ideally, it is better to use a coil with a core material that has low temperature coefficient characteristics.
2. External capacitor VCO tank circuits
When an external capacitor is used, heat generated by the IC is transmitted through the printed circuit board directly
to the VCO tank circuit external capacitor. While this capacitor is heated relatively early after the power is turned on,
the coil is not influenced as much by this heat, and as a result the power-on drift is increased. Accordingly, a coil
whose core material has low temperature coefficient characteristics must be used. It is also desirable to use a
capacitor with similarly low temperature coefficient characteristics.
Note: Applications that use an external capacitor here must use a chip capacitor. If an ordinary capacitor is used,
problems such as the oscillator frequency changing with the capacitor orientation may occur.
This catalog provides information as of November, 1999. Specifications and information herein are
subject to change without notice.
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer's
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer's products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining the export license from the authorities concerned in accordance with the
above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO product that you intend to use.
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.
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