LA7565KM [SANYO]
IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products; 中频信号处理IC，适用于PAL / NTSC多系统音频的电视和录像机产品
| 型号： | LA7565KM |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products |
| 文件： | 总18页 (文件大小：198K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number :ENN6100A
Monolithic Linear IC
LA7565E, 7565KM
IF Signal-Processing IC for PAL/NTSC Multi-System
Audio TV and VCR Products
Overview
Features
The LA7565E and LA7565KM are PAL/NTSC multi-
system audio VIF/SIF signal-processing ICs that adopt a
minimal-adjustment technique. The VIF circuit adopts a
minimal-adjustment technique in which AFT adjustment is
made unnecessary by VCO adjustment to simply end
product adjustment. The FM detector circuit uses PLL
detections to support multi-system audio detection. Since
the LA7565BM include an SIF converter on chip, it is easy
to implement multi-system audio. In addition, it also
includes a buzz canceller that suppresses Nyquist buzz to
achieve improved audio quality. The LA7565G and
LA7565KM feature improvements over the LA7565B and
LA7565BM in the FM low-range frequency characteristics,
vertical synchronization buzz, and AFT drift.
• Allows the use of a switch circuit to switch between
spilt and intercarrier operation.
• Improved buzz and buzz beat characteristics provided by
a PLL detector plus buzz canceller system.
• The IF AGC second filter is built in.
• PAL/NTSC multi-system audio can be implemented
easily.
• Adjustment-free circuit design that does not require AFT
and SIF coils.
Functions
[VIF Block]
• PLL detector
• AFT
• RF AGC
• Buzz canceller
• Equalizer amplifier
• SIF converter
• VIF amplifier
• IF AGC
[First SIF Block]
• First SIF detector
• First SIF amplifier
[SIF Block]
• PLL type FM detector
• Limiter amplifier
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
40703AS (OT) No. 6100-1/18
LA7565E, 7565KM
Package Dimensions
unit: mm
unit: mm
3112-MFP24S
3067-DIP24S
[LA7565E]
[LA7565KM]
24
13
24
13
1
12
21.2
1
12
0.15
12.6
0.8
1.0
0.35
0.48
0.81
1.78
0.95
SANYO: MFP24S
SANYO: DIP24S
Specifications
Maximum Rating at Ta = 25°C
Parameter
Maximum supply voltage
Circuit voltage
Symbol
CC max
Conditions
Ratings
Unit
V
V
10
VCC
V13, V17
V
I6
–3
mA
mA
mA
mW
mW
mW
°C
Circuit current
I10
I24
–10
–2
(LA7565E)
(LA7565KM) Ta ≤ 50°C, independent IC
(LA7565KM) * Mounted on a printed circuit board
Ta ≤ 68°C
720
Allowable power dissipation
Pd max
420
720
Operating temperature
Storage temperature
Topr
Tstg
–20 to +70
–55 to +150
°C
Note: * When mounted on a 65 × 72 × 1.6 mm epoxy glass laminate printed circuit board.
Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Operating supply voltage
Symbol
VCC
Conditions
Ratings
9
Unit
V
V
CC op
8.5 to 9.5
V
No. 6100-2/18
LA7565E, 7565KM
Electrical Characteristics at Ta = 25°C, V = 9 V, fp = 38.9 MHz
CC
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
[VIF Block]
Circuit current
I5
37.4
44
8.1
0
50.6
mA
V
Maximum RF AGC voltage
Minimum RF AGC voltage
Input sensitivity
V14H
V14L
VIN
7.5
0.5
38
V
S1 = OFF
26
62
32
dBµV
dB
dBµV
V
AGC range
GR
68
Maximum allowable input
No-signal video output voltage
Synchronizing signal tip voltage
Video output level
V
IN max
92
97
V6
3.5
1.15
1.7
0.5
2.5
48
3.8
1.45
2.0
0.8
2.8
50
4.2
1.74
2.3
V
6 tip
V
VO
VBTH
VBCL
S/N
IC-S
fC
Vp-p
V
Black noise threshold voltage
Black noise clamp voltage
Video S/N ratio
1.1
3.1
V
dB
dB
dB
%
C-S beat
38
43
Frequency characteristics
Differential gain
6 MHz
–3.0
–1.5
3.0
3
DG
DP
V13
V13H
V13L
Sf
6.5
5
Differential phase
deg
V
No-signal AFT voltage
Maximum AFT voltage
Minimum AFT voltage
AFT detection sensitivity
VIF input resistance
VIF input capacitance
APC pull-in range (U)
APC pull-in range (L)
AFT tolerance frequency 1
VCO1 maximum frequency range (U)
VCO1 maximum frequency range (L)
VCO control sensitivity
[First SIF Block]
3.5
8.0
0
4.4
8.7
0.18
36
5.5
9.0
1.00
V
V
25
47 mV/kHz
Ri
38.9 MHz
38.9 MHz
1.5
3
kΩ
pF
Ci
fPU
fPL
0.8
1.3
–1.5
0
MHz
–0.8
MHz
kHz
dfa 1
dfu
dfl
–300
1.0
+300
1.3
–1.5
1.8
MHz
MHz
–1.0
B
0.9
3.6 kHz/mV
Conversion gain
VG
SO
37.5
46
43.0
100
223
2
49.5
dB
mVrms
mVrms
kΩ
5.5 MHz output level
First SIF maximum input
First SIF input resistance
First SIF input capacitance
[SIF Block]
150
Si max
112
Ri (SIF) 33.4 MHz
Ci (SIF) 33.4 MHz
3
pF
Limiting voltage
Vi (lim)
43
720
50
48
900
60
53
dBµV
mVrms
dB
FM detector output voltage
AM rejection ratio
VO (FM) 5.5 MHz ± 30 kHz*
1100
AMR
THD
Total harmonic distortion
SIF S/N ratio
0.3
62
0.8
%
S/N (FM)
57
dB
[SIF Converter]
Conversion gain
VG (SIF)
V max
VGR (5.5)
VOSC
7
102
14
11
108
26
14
dB
dBµV
dB
Maximum output level
Carrier suppression ratio
Oscillator level
111
70
mVp-p
dB
Oscillator leakage
OSCleak
I4
8
24
Oscillator stopped current
300
µA
Note: *The FM detector output level can be reduced and the FM dynamic range can be increased by inserting a resistor and a capacitor in series between
pin 23 and ground.
No. 6100-3/18
LA7565E, 7565KM
[LA7565E]
[LA7565KM]
Pd max
- Ta
Pd max
- Ta
800
800
Mounted on a 65 × 72 × 1.6 mm printed circuit board
720
700
720
700
600
500
400
300
200
600
500
Independent IC
420
400
300
200
100
0
100
0
-20
0
20
40
60 68 80
100
-20
0
20
40
60 70 80
100
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
Pin Assignment
24
23
22
21
20
19
18
17
16
15
14
13
LA7565E/7565KM
Top view
1
2
3
4
5
6
7
8
9
10
11
12
A12051
No. 6100-4/18
LA7565E, 7565KM
Internal Equivalent Circuit and External Circuit Diagram
IF
IN PUT
RFAGC
VR
RF AGC
OUT PUT
AUDIO
OUT PUT
( )
SAW P
5.6 k
Ω
AFT
OUTPUT
+
SAW
(
)
S
24
23
22
21
20
19
18
17
16
15
14
13
1 k
Ω
1 k
Ω
2 k
Ω
620
Ω
30 pF
1 k
Ω
V
1 k
Ω 1 kΩ
1 k
Ω
V
V
400
400
Ω
Ω
1 k
Ω 2 kΩ
1V
1
2
3
4
5
6
7
8
9
10
11
12
+
68
Ω
BPF
VCO
COIL
+
6MHz
330
Ω
330
Ω
V
CC
GND
VIDEO
OUT
T00049
No. 6100-5/18
LA7565E, 7565KM
AC Characteristics Test Circuit
1st SIF IN
VIF IN
1st SIF OUT
(
)
NICAM OUT
51
Ω
51 Ω
RF AGC
OUT
IF AGC
RF AGC
V
R
(
F
)
FM DET OUT
( )
D
5.6 k
Ω
GND
AFT
+
OUT
(
B
)
24
23
22
21
20
19
18
17
16
15
1st
14
13
VIF
AMP
RF
AGC
IF
AGC
AMP
AGC
FM
DET
VIDEO
DET
1st
AFT
DET
HPF
HPF
LIM
AMP
MIX
HPF
EQ
AMP
VCO
1
2
3
4
5
6
7
8
9
10
11
12
+
+
24 pF
51
Ω
+
VIDEO
OUT
330
Ω
2nd SIF IN
CONV.OUT
(
A
)
(
E
)
V
CC
GND
T00053
Test Circuit
Impedance
analyzer
1st SIF IN
VIF IN
24
23
22
21
20
19
18
17
16
15
14
13
LA7565E/7565KM
1
2
3
4
5
6
7
8
9
10
11
12
V
CC
+
T00054
No. 6100-6/18
LA7565E, 7565KM
Sample Application Circuit
PAL SPLIT
IN PUT
TSF5315
SAW
RF AGC
OUT
(
)
S
(
)
SAW P
GND
5.6 k
Ω
+
AFT
OUT
AF OUT
24
23
22
21
20
19
18
17
16
15
14
13
VIF
AMP
1st
AMP
RF
AGC
IF
AGC
AGC
FM
DET
VIDEO
DET
1st
AFT
DET
HPF
LIM
AMP
HPF
MIX
HPF
EQ
AMP
VCO
1
2
3
4
5
6
7
8
9
10
11
12
+
68
Ω
+
BPF
330
Ω
15
µH
330
Ω
V
(9V)
CC
GND
VIDEO
OUT
T00048
NT (US) SPLIT
IN PUT
TSF1241
SAW
RF AGC
OUT
(
)
S
(
)
SAW P
GND
1 µH
5.6 k
Ω
+
AFT
OUT
AF OUT
1 k
Ω
24
23
22
21
20
IF
19
18
17
16
15
14
13
VIF
AMP
1st
AMP
RF
AGC
AGC
AGC
FM
DET
VIDEO
DET
1st
AFT
DET
HPF
LIM
AMP
HPF
MIX
HPF
EQ
AMP
VCO
1
2
3
4
5
6
7
8
9
10
11
12
+
+
BPF
330
Ω
15
µH
330
Ω
V
(9V)
CC
GND
VIDEO
OUT
T00046
No. 6100-7/18
LA7565E, 7565KM
JAPAN SPLIT
IN PUT
TSF1137
SAW
RF AGC
OUT
(
)
S
(
)
SAW P
GND
5.6 k
Ω
+
AFT
OUT
AF OUT
1 k
Ω
24
23
22
21
20
19
18
17
16
15
14
13
VIF
AMP
1st
AMP
RF
AGC
IF
AGC
AGC
FM
DET
VIDEO
DET
1st
AFT
DET
HPF
LIM
AMP
HPF
MIX
HPF
EQ
AMP
VCO
1
2
3
4
5
6
7
8
9
10
11
12
+
+
BPF
330
Ω
15 µH
330
Ω
V
(9 V)
CC
GND
VIDEO
OUT
T00045
NT (US) INTER
IN PUT
TSF5220
RF AGC
OUT
(
)
SAW P
GND
5.6 k
Ω
+
AFT
OUT
AF OUT
24
23
22
21
20
19
18
17
16
15
14
13
VIF
AMP
1st
AMP
RF
AGC
IF
AGC
AGC
FM
DET
VIDEO
DET
1st
AFT
DET
INTER
16PIN
*
GND
HPF
LIM
AMP
HPF
MIX
HPF
EQ
AMP
VCO
1
2
3
4
5
6
7
8
9
10
11
12
+
+
BPF
330
Ω
15 µH
330
Ω
V
(9V)
CC
GND
VIDEO
OUT
T00047
No. 6100-8/18
LA7565E, 7565KM
Sample Application Circuit (2)
When the SIF, first SIF, AFT, and RF AGC circuits are not used.
• When the SIF circuit is not used:
Leave pins 1, 23, and 24 open.
Insert a 2-kΩ resistor between pin 2 and ground.
• When the first SIF circuit is not used:
Leave pins 3, 4, 15, and 22 open.
Connect pin 16 to ground.
• When the AFT circuit is not used:
Since there is no way to defeat the AFT circuit, connect a 100-kΩ resistor and a 0.01-µF capacitor in parallel between
pin 13 and ground.
• When the RF AGC circuit is not used:
Leave pins 14 and 21 open.
A 0.01-µF capacitor must be inserted between pin 21 and ground to prevent oscillation.
IN PUT
TSF5315
SAW
(
S
)
(
)
SAW P
GND
AFT
OUT
1 k
Ω
24
23
22
21
20
19
18
17
16
15
14
13
VIF
AMP
1st
AMP
RF
AGC
IF
AGC
AGC
FM
DET
VIDEO
DET
1st
AFT
DET
HPF
LIM
AMP
HPF
MIX
HPF
EQ
AMP
VCO
1
2
3
4
5
6
7
8
9
10
11
12
+
15
µH
330
Ω
V
CC
GND
VIDEO
OUT
T00044
No. 6100-9/18
LA7565E, 7565KM
Pin Functions
Pin No.
Pin
Pin function
Equivalent circuit
The input impedance is about 1 kΩ. If interference signals
enter via this pin, those signals may cause buzz and buzz
beat noise. (Here, signals such as video signals or
chrominance signals are the main audio interference
signals. The VIF carrier signal may also appear as
interference.) The application printed circuit board pattern
layout should be designed carefully to prevent interference
from entering at this pin.
1
1
SIF INPUT
1 kΩ
1 kΩ
A12052
4.2V
The FM S/N ratio can be improved by inserting a filter in the
FM detector bias line.
The capacitor C1 should have a value of 0.47 µF or greater,
and 1 µF is recommended.
2
C
1
2
FM power supply filter
A 2-kΩ resistor must be inserted between pin 2 and ground
if the FM detector is not used. This stops the FM detector
VCO.
TO VCO BIAS
A12053
Pin 3 is the SIF converter output.
3
200 Ω
This signal is passed through a 6-MHz band-pass filter and
input to the SIF circuit. A 200-Ω resistor is inserted in series
with the emitter-follower output.
500 kHz
68 Ω
Pin 4 is the SIF converter 500-kHz oscillator pin.
Since the oscillator circuit includes an ALC circuit, the
oscillator level is controlled at a fixed, relatively low level. An
external 10-kΩ resistor must be inserted between pin 3 and
ground if this circuit is not used. Attaching this external
resistor stops the 500-kHz oscillator and the converter can
be used as an amplifier.
3
4
SIF converter
4
A12054
400 Ω
400 Ω
A12055
Continued on next page.
No. 6100-10/18
LA7565E, 7565KM
Continued from preceding page.
Pin No.
5
Pin
Pin function
Equivalent circuit
VCC and ground should be decoupled with as small a
separation as possible.
VCC
6
2 kΩ
1 kΩ
EQ OUTPUT
Connections for the equalizer circuit. This circuit corrects the
frequency characteristics of the video signal.
Pin 8 is the equalizer amplifier input. A 1.5-Vp-p video signal
is input and amplified to 2.0 Vp-p by the equalizer amplifier.
The equalizer amplifier is designed as a voltage-follower
amplifier with a gain of about 2.3 dB. When frequency
characteristic correction is used, a capacitor, an inductor,
and a resistor must be connected in series between pin 7
and ground.
7
C
L
=Z
• Using the equalizer amplifier
If vi is the input signal and vo is the output signal, then:
R1/Z + 1 (vi + vin) = Vo × G
Where,
G: Gain of the voltage follower amplifier
vin: Imaginary short
R
6
7
8
A12056
EQ amp
G: About 2.3 dB
Assuming vin ≈ 0:
Then,
AV = voG/vi = R1/Z + 1.
R1 is an IC internal resistor with a value of 1 kΩ. Simply
select a Z according to the desired characteristics. However,
since the equalizer amplifier is maximum at the Z resonance
point, care is required to prevent distortion from occurring at
that frequency.
EQ INPUT
8
200 Ω
AGC
A12057
FROM
APC DET
PLL detector APC filter connection.
The APC time constant is switched internally. When the PLL
is locked, the VCO is controlled over the path marked A in
the figure and the loop gain is lowered. When the PLL is
unlocked and in weak field reception conditions, the VCO is
controlled over the path marked B in the figure and the loop
gain is increased.
A
1 kΩ 1 kΩ 1 kΩ
9
APC filter
We recommend values of:
R = between 150 and 390 Ω, and
C = 0.47 µF
B
for this APC filter.
9
A12058
Continued on next page.
No. 6100-11/18
LA7565E, 7565KM
Continued from preceding page.
Pin No.
Pin
Pin function
Equivalent circuit
2 kΩ
Output for the video signal that includes the SIF carrier.
To acquire adequate drive capabilities, a resistor must be
inserted between pin 10 and ground.
10
10
Composite video output
15 pF
R ≥ 300 Ω
A12059
11
12
This is the VCO tank circuit used for the video detector.
Refer to the coil specifications provided separately for more
information on the tank circuit. This VCO is a vector
synthesis VCO.
11
12
VCO tank
A12060
The AFT center voltage is created by an external bleeder
resistor. The AFT gain increases as the value of this
external bleeder resistor is increased. Note that the value of
this resistor must not exceed 390 kΩ.
This circuit includes a control function that naturally brings
the AFT voltage to its center value under weak field
reception conditions.
13
AFT output
13
A12061
This output controls the tuner RF AGC.
There is a 200-Ω series protection resistor inserted in the
emitter output. Determine the value of the external bleeder
resistor based on the characteristics of the tuner used.
14
RF AGC output
to tuner
14
100 Ω
A12062
Continued on next page.
No. 6100-12/18
LA7565E, 7565KM
Continued from preceding page.
Pin No.
Pin
Pin function
Equivalent circuit
A DC cut capacitor must be used in the input to this circuit.
• When using a SAW filter:
The first SIF sensitivity can be increased by inserting an
inductor between the SAW filter and the IC input to
counteract the SAW filter output capacitance and the IC
input capacitance.
2 kΩ
2 kΩ
15
First SIF input
• When used with an intercarrier sound system:
This pin may be left open.
15
A12063
This IC adopts an average-value AGC technique. The first
SIF conversion gain is about 30 dB, and the AGC range is
50 dB or greater. A capacitor of 0.01 µF is normally used as
the filter connected to this pin.
1 kΩ
1 kΩ
16
First SIF AGC filter
• When used with an intercarrier sound system:
This pin (pin 16) should be shorted to ground. The IC
internal switch will operate and the intercarrier output will be
connected to the SIF converter input.
INTER/SPLIT SW
LO=INTER
16
A12064
The internal AGC peak detector output signal is converted
to the AGC voltage at pin 17. Additionally, a second AGC
filter (a lag-lead filter) used to create dual time constants
internally to the IC is built in.
17
IF AGC filter
A 0.022-µF external capacitor is used. The value of this
capacitor must be adjusted based on an analysis of the sag,
AGC speed, and other aspects.
17
A12065
Continued on next page.
No. 6100-13/18
LA7565E, 7565KM
Continued from preceding page.
Pin No.
Pin
Pin function
Equivalent circuit
18
19
Input for the VIF amplifier.
The input circuit creates an averaged input and has an input
impedance determined by the following resistor and
capacitor values.
R ≈ 1.5 kΩ
18
19
VIF input
C ≈ 3 pF
A12066
20
GND
4.2V
RF AGC VR connection.
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 shorting this pin to ground.
21
RF AGC VR
21
A12067
A 600-Ω resistor is attached to the emitter follower internally
for signal output. When an intercarrier sound system is
used, the buzz characteristics can be improved by forming a
chrominance carrier trap on this pin.
20 kΩ
20 kΩ
22
First SIF output
620 Ω
22
6 kΩ
Construct a chrominance
carrier trap here.
22
A12068
Continued on next page.
No. 6100-14/18
LA7565E, 7565KM
Continued from preceding page.
Pin No.
Pin
Pin function
Equivalent circuit
Connection for a filter used to hold the FM detector output at
a fixed DC voltage.
Normally, a 1-µF electrolytic capacitor is used. If the low
area (around 50 Hz) frequency characteristics are seen as a
problem, this capacitance should be increased.
1 kΩ
1 kΩ
23
FM filter
The FM detector output level can be reduced and the FM
dynamic range can be increased by inserting a resistor and
a capacitor in series between pin 23 and ground.
23
C
R
+
A12069
Audio FM detector output.
A resistance of 200 Ω is inserted in series with the emitter
follower.
• In applications that support stereo:
In applications that input to a stereo decoder, the reduced
input impedance can cause distortion in the L-R signal. This
may degrade the stereo characteristics. If this is a problem
add the resistor R1 between pin 24 and ground.
R1 ≥ 5.1 kΩ
• In applications that support mono:
Attach an external de-emphasis circuit with the following
time constant.
R2
24
FM detector output
24
300 Ω
R1
C
A12070
t = CR2
No. 6100-15/18
LA7565E, 7565KM
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
extended
The high band is reduced
Frequency
Frequency
A12071
With the tuning set to the IF frequency
With the tuning set to the vicinity of S and C
No. 6100-16/18
LA7565E, 7565KM
Coil Specifications
JAPAN
US
PAL
f = 58.75 MHz
f = 45.75 MHz
f = 38.9 MHz
t = 6 t
0.12 ø
t = 7 t
0.12 ø
t = 5 t
0.12 ø
S
S
S
C = 24 pF
C = 24 pF
C = 24 pF
VCO coil
A12073
A12074
A12072
Test production no. V291XCS-3220Z
Toko Co., Ltd.
Test production no. 291XCS-3188Z
Toko Co., Ltd.
Test production no. 292GCS-7538Z
Toko Co., Ltd.
Picture
Picture
Picture
TSF1137U
TSF1241
TSF5315
SAW filter (SPLIT)
Sound
Sound
Sound
TSF5220
TSF5221
TSF5321
TSF5344
SAW filter (INTER)
Toko Co., Ltd.
2-1-17 Higashi-yukigaya, Ohta-ku, Tokyo, Japan TEL: +81-3-3727-1167
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
transformer. 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 transformer'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.
No. 6100-17/18
LA7565E, 7565KM
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 April, 2003. Specifications and information herein are subject to
change without notice.
PS No. 6100-18/18
相关型号：
LA75675M-S
VIF/SIF IF Signal-Processing Circuit that Supports NTSC Intercarrier for TV and VCR Products
SANYO
©2020 ICPDF网 联系我们和版权申明