LA75665M [ETC]
;
ETC 
Ordering number : ENN6227A
Monolithic Linear IC
LA75665M
VIF/SIF IF Signal-Processing Circuit with TV/VCR PAL
and NTSC Multisound Support
[First SIF Block]
• First SIF amplifier
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.
• First SIF detector
• AGC
[SIF Block]
• Multiple input switch
• Limiter amplifier
• PLL FM detector
Package Dimensions
unit: mm
3112-MFP24S
[LA75665M]
13
24
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
1
12
0.15
12.6
0.35
1.0 0.8
• RF AGC
SANYO: MFP24S
• EQ amplifier
• AFT
• IF AGC
• Buzz canceller
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.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
N3099TH (OT) No. 6227-1/12
LA75665M
Pd max — Ta
800
With substrate (65 × 72 × 1.6 mm3)
720
700
600
500
Independent IC
420
400
300
200
100
0
–20
0
20
40
60
70 80
100
Ambient temperature, Ta — °C
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Circuit voltage
Symbol
VCC max
V7, V10,
I1
Conditions
Ratings
Unit
V
6
VCC
–2
V
mA
mA
mA
mW
mW
°C
Circuit current
I13
–3
I18
–10
Ta ≤ 50°C, independent IC
420
Allowable power dissipation
Pd max
When mounted on a printed circuit board*
720
Operating temperature
Storage temperature
Topr
Tstg
–20 to +70
–55 to +150
°C
Note: * Size: 65 × 72 × 1.6 mm3, Material: paper/phenol composite
Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Operating supply voltage range
Symbol
VCC
Conditions
Ratings
5
Unit
V
VCC op
4.6 to 5.5
V
No. 6227-2/12
LA75665M
Operating Characteristics at Ta = 25°C, V = 5 V, fp = 38.9 MHz
CC
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
[VIF Block]
Circuit current
I3
V9H
V9L
VIN
39
46
4.9
0
53
mA
V
Maximum RF AGC voltage
Minimum RF AGC voltage
Input sensitivity
4.5
0.5
41
V
S1 = OFF
29
45
35
dBµV
dB
dBµV
V
AGC range
GR
50
Maximum allowable input
No-signal video output voltage
Sync tip voltage
VIN max
V13
V13 tip
VO
95
100
3.5
1.0
2.1
0.6
1.8
52
3.2
0.8
1.75
0.3
1.5
48
3.8
1.2
V
Video output level
2.42
0.9
Vp-p
V
Black noise threshold voltage
Black noise clamp voltage
Video signal-to-noise ratio
C-S beat
VBTH
VBCL
S/N
IC-S
fC
2.1
V
dB
dB
dB
%
44
49
Frequency characteristics
Differential gain
6 MHz
–3
–1.5
3
DG
8
8
Differential phase
DP
3
deg
V
AFT voltage with no input signal
Maximum AFT voltage
Minimum AFT voltage
AFT detection sensitivity
VIF input resistance
V10
V10H
V10L
Sf
4
4.2
0
4.5
4.8
0.1
25
5.0
5.0
0.2
V
V
19
32 mV/kHz
Ri
38.9 MHz
38.9 MHz
1.5
3
kΩ
pF
VIF input capacitance
APC pull-in range (U)
APC pull-in range (L)
AFT tolerance frequency 1
VCO 1 maximum variability range (U)
VCO 1 maximum variability range (L)
VCO control sensitivity
Drift when the AFT switch is on
[First SIF Block]
Ci
fPU
1.0
1.5
–1.5
0
MHz
fPL
–0.8
MHz
kHz
dfa1
dfu
–200
1.3
+200
1.5
–1.5
2.3
MHz
MHz
dfl
–0.75
B
1.25
5.0 kHz/mV
Drift
3
s
Conversion gain
VG
SO
28
125
500
31
177
1000
2
34
dB
mVrms
mVrms
kΩ
5.5 MHz output level
Maximum first SIF input
First SIF input resistance
First SIF input capacitance
[SIF Block]
251
SIN max
RIN(SIF) 33.4 MHz
CIN(SIF) 33.4 MHz
3
pF
Limiting sensitivity
VIi(lim)
36
570
60
42
dBµV
mVrms
dB
FM detector output voltage
AM rejection ratio
VO(FM) 5.5 MHz ± 30 kHz
450
50
720
AMR
THD
Total harmonic distortion
SIF S/N
0.2
60
1.5
2.5
7
%
S/N (FM)
FMDC
55
dB
FM detector output DC voltage
1.9
2.2
V
[SIF Switch Block] Switches A, B, and C: H = open, L = ground
NTSC mode 6-dB amplifier
SIF crosstalk 21
NTSW
CT21
CT22
CT23
CT24
SW (L)
5
51
51
51
51
1.0
6
57
57
57
57
1.5
dB
dB
dB
dB
dB
V
SIF crosstalk 22
SIF crosstalk 23
SIF crosstalk 24
Switch threshold low-level voltage
2.0
No. 6227-3/12
LA75665M
Pin Assignment
24
23
22
21
20
19
18
17
16
15
14
13
LA75665M
Top view
1
2
3
4
5
6
7
8
9
10
11
12
A12481
Application Circuit Diagram
8.2 µH
5.5 MHz, 6.0 MHz, 6.5 MHz
6.5 MHz 6.0 MHz 5.5 MHz 4.5 MHz
150 Ω
15 µH
330 Ω
2.2 kΩ
2.2 kΩ
2.2 kΩ
C
B
A
VIDEO
OUT
4.5 MHz
+
+
24
23
22
21
20
19
18
17
16
15
14
13
EQ
AMP
INPUT SW
LIM
AMP
RF
AGC
IF
AGC
VIDEO
DET
1ST SIF
DET
F
7
1ST
VIF
FM
AMP
DET
AFT
10
VCO
1
2
3
4
5
6
8
9
11
12
+
5.1 kΩ
AUDIO
OUT
AFT
OUT
SAW
(S)
SAW(P)
RFAGC
OUT
+
V
CC
Switch
A12482
5.5 MHz 6.0 MHz 6.5 MHz 4.5 MHz
A
H
H
H
H
L
B
H
H
L
C
H
L
●
●
●
●
H
L
L
H
L
H
L
●
●
●
●
●
●
●
●
●
●
L
●
H : OPEN
L : GND
L
H
L
L
L
H
No. 6227-4/12
LA75665M
Internal Equivalent Circuit Diagram
No. 6227-5/12
LA75665M
AC Characteristics Test Circuit Diagram
2nd SIF IN
51
51
51
51
VIDEO
OUT
(A)
1st SIF OUT
(C)
SWA
SWB
SWC
S1
+
+
RF
vr 20K-B
24
23
22
21
20
19
18
17
16
15
14
13
EQ
AMP
INPUT SW
LIM
AMP
RF
AGC
IF
AGC
VIDEO
DET
1ST SIF
DET
F
7
VIF
AMP
1ST
FM
AMP
DET
AFT
10
VCO
1
2
3
4
5
6
8
9
11
12
+
FM DET OUT
(D)
5.1 kΩ
GND
MA6389
51 Ω
51 Ω
+
RFAGC
OUT
(F)
AFT
OUT
(B)
IF AGC
VIF IN
1ST SIF IN
V
CC
GND
A12484
Input Impedance Test Circuit Diagram (VIF and first SIF input impedance)
24
23
22
21
20
19
18
17
16
15
10
14
11
13
12
LA75665M
1
2
3
4
5
6
7
8
9
VIF IN
1st SIF IN
Impedance analyzer
+
V
CC
A12485
No. 6227-6/12
LA75665M
Pin Functions
Pin No.
Symbol
Pin function
Equivalent circuit
• Audio FM detector output
This circuit includes an internal 300 Ω 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.
R2
1
1
FM DET OUT
300 Ω
R1
10 kΩ
C
R1 ≥ 5.1 kΩ
• Mono applications
Forms an external deemphasis circuit.
t = CR2
A12486
• Connection for a filter that holds the FM detector output DC
voltage at a fixed level. Normally, a 1-µF electrolytic capacitor is
used. To improve the low band (around 50 Hz) frequency
characteristics, increase the value of this capacitor (C1).
1 kΩ 1 kΩ
2
SIF FILTER
The FM detector output level can be reduced and the FM
dynamic range increased by inserting this resistor in series with
the capacitor.
2
+
C1
R
A12487
1 kΩ
1 kΩ
• VIF amplifier input.
5
The input circuit is constructed as a balanced input, and the
input has the following impedance characteristics:
5
6
VIF IN
R ≈ 1.5 kΩ
C ≈ 3 pF
6
A12488
Continued on next page.
No. 6227-7/12
LA75665M
Continued from preceding page.
Pin No.
Symbol
Pin function
Equivalent circuit
2 kΩ
• IF AGC filter connection.
1 kΩ
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 µF
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
IF AGC
10 kΩ
7
C1
A12489
• 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.
2 kΩ
2 kΩ
8
1st SIF IN
When an intercarrier system is used: This pin must be
connected to ground through a capacitor.
8
A12490
500 Ω
V
CC
• RF AGC output.
This output controls the tuner RF AGC. This is an open-
collector output with an inserted 100-Ω protective resistor.
Determine the value of the external bleeder resistor to match
the tuner specifications.
9
RF AGC OUT
100 Ω
9
3 pF
A12491
• 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 kΩ. This circuit includes a control function that controls the
AFT voltage to be equal to the center voltage in weak field
reception conditions.
10
AFT OUT
10
1 kΩ
A12492
Continued on next page.
No. 6227-8/12
LA75665M
Continued from preceding page.
Pin No.
Symbol
Pin function
Equivalent circuit
12
11
• VCO tank circuit used for video detection.
11
12
1.2 kΩ 1.2 kΩ
VCO
See the separately provided documentation for the tank circuit
coil (inductor) specifications.
A12493
• 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.
2 kΩ
1 kΩ
13
13
14
VIDEO OUT
EQ FILTER
The equalizer amplifier gain is given by:
9.2 kΩ
R1
AV = —— + 1
Z
14
Here, R1 is an IC internal resistor with a value of 1 kΩ. 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.
C
L
Z
R
A12494
• Equalizer amplifier inputs.
15
16
PAL VIDEO IN
NT VIDEO IN
15
200 Ω
200 Ω
Pin 15 is for PAL, and pin 16 for NTSC format signals. These
inputs are linked to and switched by the SIF switches.
16
A12495
FRO
APC
• 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.
A
1 kΩ 1 kΩ 1 kΩ
17
APC FILTER
We recommend values of:
R = 150 to 390 Ω, and
C = 0.47 µF
B
for the loop filter constants.
17
A12496
Continued on next page.
No. 6227-9/12
LA75665M
Continued from preceding page.
Pin No.
Symbol
Pin function
Equivalent circuit
15pF
• 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.
1.5 kΩ 2 kΩ
18
COMP OUT
2pF
1 KΩ
R ≥ 470 Ω
18
A12497
1 kΩ
• First SIF output
19
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
1st SIF OUT
A12498
• The FM detector signal-to-noise ratio can be improved by
inserting a filter in the FM detector bias line.
2.5 kΩ
1.5 kΩ
20
C1 should have a value of 0.47 µF or greater, and 1 µF is
recommended .
+
C1
20
FM FILTER
If the FM detector is not used, pin 20 must be connected to
ground through a 2-kΩ resistor. This stops the FM detector
VCO circuit.
A12499
• 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.
V
CC
VBGZ=3.6
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
Switch
5.5 MHz 6.0 MHz 6.5 MHz 4.5 MHz
A
H
H
H
H
L
B
H
H
L
C
H
L
●
●
21
22
23
24
H
L
●
L
●
●
4.5MEG
5.5MEG
6.0MEG
6.5MEG
H
L
H
L
●
●
●
●
●
●
●
●
●
●
L
L
H
L
L
SWA
SWB
SWC
L
H
A12500
No. 6227-10/12
LA75665M
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 ■ ■ ······ Japan
TSF12 ■ ■ ······ 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 ■ ■ ······ US
TSF53 ■ ■ ······ 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.
SAW filter characteristics
The high-band is
The high-band is reduced
extended
Frequency
Frequency
A12501
With the tuning set to the IF frequency
With the tuning set to the vicinity of S and C
Coil Specifications
JAPAN f = 58.75 MHz
US f = 45.75 MHz
t = 6 t
PAL f = 38.9 MHz
t = 7 t
t = 5 t
S
S
S
0.12ø
0.12ø
0.12ø
C = 27 pF
C = 39 pF
C = 39 pF
VCO coils
A12502
A12503
A12504
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)
SAW filters (inter)
TSF1137U
SOUND
TSF1241
SOUND
TSF5220
TSF5221
TSF5315
SOUND
TSF5321
TSF5344
Tokyo Parts Industrial Co., Ltd. 236 Hinode Machi Isesaki Shi, Gunma Prefecture Japan TEL: +81-270-23-3731
No. 6227-11/12
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.
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.
This catalog provides information as of November, 1999. Specifications and information herein are
subject to change without notice.
PS No. 6227-12/12
相关型号：
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LA7567EV
TV and VCR VIF/SIF IF Signal-Processing Circuit with PAL/NTSC Multi-Format Audio Support
SANYO
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