Ordering number : ENN6276B
51500RM (OT) No. 6276-1/13
Overview
The LA75675M-S is an NTSC intercarrier VIF/SIF IC
that adopts a semi-adjustment-free structure. In particular,
it uses VCO adjustment to make AFT adjustment
unnecessary and thus simplifies the overall adjustment
process. A PLL-based technique is adopted for FM
detection. The 5 V supply voltage provides compatibility
with other multimedia systems. In addition it achieves
high audio quality by incorporating a built-in buzz
canceller that suppresses Nyquist buzz.
Functions
[VIF]
VIF amplifier PLL detector BNC
RF AGC
EQ amplifier AFT
IF AGC Buzz canceller
[SIF]
Limiter amplifier
PLL FM detector
Features
No AFT or SIF coils are used, thus eliminating
adjustments.
Excellent audio performance due to the built-in buzz
canceller.
V
CC
= 5 V and a low power dissipation of 250 mW.
Package Dimensions
unit: mm
3112A-MFP24S
1
12
24
13
12.5
(0.75)
1.0
0.15
0.35
5.4
7.6
0.63
1.7max
1.5
0.1
SANYO: MFP24S
[LA75675M-S]
LA75675M-S
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 that Supports
NTSC Intercarrier for TV and VCR Products
Monolithic Linear IC
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.
Independent IC
When mounted on a 65
72
1.6 mm
3
paper-phenol printed circuit board
0
80
100
60
70
40
20
-20
0
Ambient temperature, Ta --
C
Allowable power dissipation, Pdmax -- W
Pd max - Ta
200
100
400
300
600
500
800
700
720
420
No. 6276-2/13
LA75675M-S
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
6
V
Circuit voltage
V13, V17
V
CC
V
I6
3
mA
Circuit current
I10
10
mA
I24
2
mA
Allowable power dissipation
Pd max
Ta
50C, independent IC
420
mW
*
: Mounted on a PCB.
720
mW
Operating temperature
Topr
20 to +70
C
Storage temperature
Tstg
55 to +150
C
Specifications
Maximum Ratings
at Ta = 25C
*
: A 65
72
1.6 mm
3
paper-phenol printed circuit board
Parameter
Symbol
Conditions
Ratings
Unit
Recommended supply voltage
V
CC
5
V
Operating voltage range
V
CC
op
4.5 to 5.5
V
Operating Conditions
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
[VIF Block]
Circuit current
I5
32
40
48
mA
Maximum RF AGC voltage
V14H
V
CC
0.5
V
CC
V
Minimum RF AGC voltage
V14L
0
0.5
V
Input sensitivity
V
IN
S1 = OFF
32
38
44
dBV
AGC range
G
R
58
63
dB
Maximum allowable input
V
IN
max
95
100
dBV
No-signal video output voltage
V6
3.5
3.8
4.1
V
Sync signal tip voltage
V6 tip
0.9
1.2
1.5
V
Video output level
V
O
1.7
2.0
2.3
Vp-p
Black noise threshold voltage
V
BTH
0.5
0.8
1.1
V
Black noise clamp voltage
V
BCL
1.6
1.9
2.2
V
Video signal-to-noise ratio
S/N
48
52
dB
C-S beating
IC-S
38
43
dB
Frequency characteristics
f
C
6 MHz
3.0
1.5
dB
Differential gain
DG
3.0
6.5
%
Differential phase
DP
3
5
deg
No-signal AFT voltage
V13
2.0
2.5
3.0
V
Maximum AFT voltage
V13H
4.0
4.4
5.0
V
Minimum AFT voltage
V13L
0
0.18
1.00
V
AFT detection sensitivity
Sf
28
40
52
mV/kHz
VIF input resistance
R
IN
45.75 MHz
1.5
k
VIF input capacitance
C
IN
45.75 MHz
3
pF
APC pull-in range (U)
f
PU
1.3
2.0
MHz
APC pull-in range (L)
f
2.0
1.4
MHz
AFT tolerance frequency 1
dfa 1
150
0
+150
kHz
VCO 1 maximum variability range (U)
dfu
1.5
2.0
MHz
VCO 1 maximum variability range (L)
dfl
2.0
1.5
MHz
VCO control sensitivity
B
1.3
2.7
5.4
kHz/mV
Electrical Characteristics
at Ta = 25C, V
CC
= 5.0 V, fp = 45.75 MHz
Continued on next page.
No. 6276-3/13
LA75675M-S
Continued from preceding page.
Note: 1. The FM detection output level can be reduced and the FM dynamic range improved by inserting the resistor R in series with the capacitor between
pin 23 and ground.
Pin Arrangement
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
[SIF Block]
Limiting sensitivity
Vli (lim)
39
45
51
dBV
FM detection output voltage
V
O
(FM)
4.5 MHz 25 kHz
*
1
400
520
660
mVrms
AMR rejection ratio
AMR
50
60
dB
Total harmonic distortion
THD
0.3
0.8
%
SIF signal-to-noise ratio
S/N (FM)
59
64
dB
4.5 MHz output level
Vsout
SIF IN 80 dBV
82
89
96
dBV
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
SIF INPUT
BIAS FILTER
SIF OUT
NC
VCC
VIDEO OUT
EQ FILTER
EQ INPUT
APC FILTER
VIDEO DET OUT
VCO COIL
VCO COIL
AFT OUT
RF AGC OUT
2nd AGC FILTER
2nd AGC FILTER
1st AGC FILTER
VIF INPUT
VIF INPUT
GND
RF AGC VR
BPF-OUT
FM FILTER
FM DET OUT
A12615
LA75675M-S
Top view
Internal Equivalent Circuit and External Circuits
No. 6276-4/13
LA75675M-S
SAW(P)
+
+
+
VCO
COIL
R
7.5 k
330
150
2.2 k
330
10 k
-
B
300
1 k
1 k
1 k
1 k
1 k
1 k
120 k
120 k
6.8 k
2 k
30 k
1 k
10 k
500
100
10 k
200
9.2 k
1.2 k
1.2 k
1 k
1 k
1 k
4.7 k
2.2 k
200
10 k
4 k
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
1
F
0.47
F
1
F
0.01
F
VIDEO
OUT
0.01
F
0.01
F
1
F
0.015
F
0.01
F
330 pF
0.01
F
0.01
F
AUDIO
OUT PUT
RFAGC
VR
RF AGC
OUT PUT
IF
IN PUT
GND
BPF
AFT
OUTPUT
V
CC
V
V
V
V
1 V
4.5 MHz
A12616
Note: Resistor R must have a value of 470
or larger.
AC Characteristics Test Circuit
No. 6276-5/13
LA75675M-S
+
+
+
+
120 k
120 k
6.8 k
100 k
1.5 k
7.5 k
330
560
150
51
10 k
-
B
51
FM
DET
RF
AGC
IF
AGC
VCO
EQ
AMP
HPF
VIDEO
DET
AFT
V
LIM
AMP
6 dB
VIF
AMP
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
1
F
0.01
F
0.47
F
0.01
F
1
F
(M
)
(D)
(A)
0.01
F
0.01
F
330 pF
0.015
F
0.01
F
0.01
F
0.01
F
0.01
F
1000 pF
24 pF
(M
)
(F)
(B)
FM DET OUT
GND
IF AGC
2nd SIF IN
SIF.OUT
(E)
4.5 MHz
VIDEO
OUT
VIF IN
RF AGC
OUT
V
CC
GND
AFT
OUT
A12617
RF AGC
V
R
S1
+
330
10 k
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
100
F
0.01
F
0.01
F
0.01
F
0.01
F
0.01
F
0.01
F
0.01
F
0.01
F
0.01
F
0.01
F
0.01
F
V
CC
A12618
VIF IN
Impedance
analyzer
LA75675M-S
0.01
F
Test Circuit
Sample Application Circuit
No. 6276-6/13
LA75675M-S
4
+
+
+
+
2.2 k
7.5 k
330
560
6.8 k
30 k
120 k
120 k
330
50 k
-
VR
0
-
10 k
FM
DET
RF
AGC
IF
AGC
VCO
EQ
AMP
VIDEO
DET
SAW(P)
HPF
AFT
LIM
6 dB
AMP
VIF
AMP
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
5
6
7
8
9
10
11
12
1
F
1
F
0.01
F
15
H
0.47
F
0.01
F
1
F
(M
)
0.01
F
1000 pF
1000 pF
330 pF
0.015
F
(M
)
0.01
F
(M
)
AF OUT
GND
IN PUT
RF AGC
OUT
4.5 MHz
OUT
GND
VIDEO OUT
4.5 MHz
BPF
AFT OUT
V
CC
V
CC
V
CC
A12619
NTSC
No. 6276-7/13
LA75675M-S
Pin Functions
Pin No.
Pin
Function
Equivalent circuit
SIF input
The input impedance is about 1 k
.
Since interference signals
*
entering this input can
result in buzzing and beat signals, the pattern layout
for the signal input to this pin must be designed
carefully.
*
: Signals that can interfere with audio include video
and chrominance signals. Thus the VIF carrier
signal can cause interference.
1
SIF input
1
1 k
1 k
1 k
A12620
The FM detector signal-to-noise ratio can be improved
by inserting a filter in the FM detector bias line.
C1 must be 0.47 F or higher, and we recommend
1 F.
If the FM detector is not used, a 2 k
resistor must be
inserted between pin 2 and ground. This stops the FM
detector VCO circuit.
2
FM power supply filter
2
A12621
C1
TO VCO BIAS
4.2 V
10 k
4 k
14 k
Outputs the intercarrier detector output that has been
passed through a high-pass filter.
(4.5 MHz output)
3
SIF out
A12622
3
200
This pin should be left open.
4
NC
Use lines that are as short as possible for V
CC
/ground
decoupling.
5
V
CC
Continued on next page.
No. 6276-8/13
LA75675M-S
Continued from preceding page.
Pin No.
Pin
Function
Equivalent circuit
Equalizer circuit
This circuit corrects the frequency characteristics of
the video signal.
Pin 8 is the input to the EQ amplifier. The EQ amplifier
takes a 1.5 Vp-p video signal as its input and amplifies
that to a 2.0 Vp-p level.
Notes on the equalizer amplifier design
The equalizer amplifier is designed as a voltage
follower amplifier with a gain of about 2.3 dB. If
frequency characteristics correction is required,
insert the capacitor, inductor, and resistor between
pin 7 and ground in series.
Using the equalizer amplifier
If the input signal is vi and the output signal vo, then
R1
---- +1 (Vi + Vin) = Vo
G
Z
G: Gain of the voltage follower amplifier
Vin: Imaginary voltage
G: About 2.3 dB
Assuming Vin
0, then AV will be:
VoG
R1
AV = ---- = ---- + 1
Vi
Z
R1 is an IC internal 1 k
resistor. Simply select a
value of Z according to the desired characteristics.
However, note that the equalizer amplifier gain will be
a maximum at the Z resonance, so care is required to
prevent distortion from occurring.
6
7
8
EQ amp
6
7
8
2.2 k
40 k
200
EQ INPUT
EQ OUTPUT
AGC
9.2 k
C
R
L =Z
1 k
A12623
A12624
PLL detector APC filter connection
The APC time constant is switched internally by the IC.
When locked, the VCO is controlled by the route A,
and the gain is reduced. When unlocked or during
weak field reception, the VCO is controlled by the
route B, and the gain is increased.
We recommend the following values for this APC filter:
R = 150 to 390
C = 0.47 F.
9
APC filter
9
1 k
1 k
1 k
A
B
FROM
APC DET
A12625
C
+
R
Continued on next page.
No. 6276-9/13
LA75675M-S
Continued from preceding page.
Pin No.
Pin
Function
Equivalent circuit
Outputs a video signal that includes the SIF carrier. A
resistor must be inserted between pin 10 and ground
to acquire adequate drive capability.
R
470
10
Composit video output
10
2 k
300
15 pF
1.5 pF
A12626
VCO tank circuit for video detection
See the separately provided coil specifications for
details on the tank circuit. This VCO is a vector
synthesis VCO circuit.
11
12
VCO tank
11
12
A12627
AFT output
This circuit includes a function that controls the AFT
voltage so that it naturally goes to the center voltage
during weak field reception.
A 120 k
bleeder resistor is built in. Note that the
sensitivity can be lowered by attaching an external
resistor.
13
AFT output
13
120 k
1 k
120 k
A12628
RF AGC output
This output controls the tuner RF AGC. The internal
circuit includes both a 30 k
pull-up resistor and a
100
protective resistor. Determine the value of the
external bleeder resistor to match the specifications of
the tuner.
14
RF AGC output
14
To tuner
A12629
30 k
100
Continued on next page.
No. 6276-10/13
LA75675M-S
Continued from preceding page.
Pin No.
Pin
Function
Equivalent circuit
IF AGC filter connection
The AGC voltage is created by smoothing the signal
that results from peak detection by the AGC detector
at pins 17 (first AGC), and 15 and 16 (second AGC).
The video signal input to this IF AGC detector is a
signal that was passed through the audio trap circuit.
15
16
17
AGC filter
A12630
17
16
15
35 k
2 k
1 k
27 k
6.8 k
VIF amplifier input
The input circuit is a balanced input, and its input
impedance is due to the following component values.
R
1.5 k
C
3 pF
18
19
VIF input
18
19
A12631
Continued on next page.
20
GND
No. 6276-11/13
LA75675M-S
Continued from preceding page.
Pin No.
Pin
Function
Equivalent circuit
RF AGC adjustment
This pin sets the tuner's RF AGC operating point. Both
the FM output and the video output can be muted by
setting this pin to the ground level.
21
RF AGC VR
20 k
20 k
560
A12632
21
4.2 V
Bandpass filter output
The output to the external bandpass filter is passed
through an internal 6 dB amplifier before being output.
22
BPF-out
A12633
22
200
Filter that holds the FM detector output DC voltage
fixed.
Normally, a 1 F electrolytic capacitor is used. If the
low band (around 50 Hz) frequency characteristics are
of concern, this value should be increased. The FM
detection output level can be reduced and the FM
dynamic range improved by inserting the resistor R in
series with the capacitor between pin 23 and ground.
23
FM filter
1 k
1 k
A12634
23
C
+
R
Audio FM detector output
This is an emitter-follower circuit with a 300
resistor
inserted in series.
Stereo applications
In some application that provide input to a stereo
decoder, the input impedance may be reduced,
resulting in distortion in the L-R signal and degraded
stereo characteristics. If this problem occurs, add a
resistor between pin 24 and ground.
R1
5.1 k
Mono applications
Construct an external deemphasis circuit.
t = CR2
24
FM detector output
R2
300
10 k
C
R1
A12635
24
JAPAN f = 58.75 MHz
US f = 45.75 MHz
PAL f = 38.9 MHz
VCO coil
Prototype no. V291XCS-3220Z
Prototype no. 291XCS-3188Z
Prototype no. 292GCS-7538Z
The Toko Electric Corporation
The Toko Electric Corporation
The Toko Electric Corporation
SAW filter (SPLIT)
Picture TSF1137U Sound
Picture TSF1241 Sound
Picture TSF5315 Sound
SAW filter (INTER)
TSF5220, TSF5221
TSF5321, TSF5344
Notes on Sanyo SAW Filters
There are two types of SAW filters, which differ in the piezoelectric substrate material used, as follows:
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 low in-band ripple level.
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.
With the tuning set to the IF frequency
With the tuning set to the vicinity of S and C
No. 6276-12/13
LA75675M-S
The high band
response
is reduced
Frequency
The high band
is extended
SAW filter characteristics
Frequency
A12636
S
t = 7 t
0.12
C = 24 pF
A12639
S
t = 6 t
0.12
C = 24 pF
A12638
S
t = 5 t
0.12
C = 24 pF
A12637
Coil Specifications
The Toko Electric Corporation 2-1-17 Higashi Yukigaya Ota-ku, Tokyo Telephone: +81-3-3727-1167
PS No. 6276-13/13
LA75675M-S
Notes on VCO Transformer Circuits
Built-in capacitor VCO transformer circuits
When power is first applied, the heat generated by the IC is transmitted through the printed circuit board to the VCO
transformer. However, the VCO coil frame functions as a heat sink and dissipates the heat from the IC. As a result, it is
relatively difficult to transmit heat to the VCO transformer's built-in capacitor, and drift at power on is minimal.
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.
External capacitor VCO transformer circuits
When an external capacitor is used, the 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 power is applied, the coil
is not influenced as much by this heat, and as a result, the power-on drift is larger. 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 May, 2000. 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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