SANYO LA7567GM

Ordering number : ENN6803
Monolithic Linear IC
LA7567GM
TV and VCR VIF/SIF IF Signal-Processing Circuit with
NTSC SPLIT Support
Overview
Features
The LA7567GM is an NTSC SPLIT support VIF/SIF IF
IC that adopts a semi-adjustment-free system. The VIF
block adopts a technique that makes AFT adjustment
unnecessary by adjusting the VCO, thus simplifying the
adjustment steps in the manufacturing process. PLL
detection is adopted in the FM detector. A 5-V powersupply voltage is used to match that used in most
multimedia systems. In addition, this IC also includes a
buzz canceller to suppress Nyquist buzz and provide high
audio quality.
• Both AFT and SIF inductors built in, thus making
adjustment of external inductance unnecessary.
• Built-in buzz canceller for excellent audio performance.
• VCC = 5 V, low power dissipation (250 mW)
Package Dimensions
unit: mm
3112A-MFP24S
[LA7567GM]
12
0.63
5.4
12.5
1.7max
1
0.15
0.1 1.5
[VIF]
• VIF amplifier • PLL detector • BNC • RF AGC
• EQ amplifier • AFT • IF AGC • Buzz canceller
[First SIF]
• First SIF • First SIF detector • AGC
[SIF]
• Multi-format SIF converter • Limiter amplifier • PLL
FM detector
7.6
13
24
Functions
0.35
1.0
(0.75)
SANYO: MFP24S
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VCC max
6
Circuit voltage
V13, V17
VCC
Circuit current
Allowable power dissipation
V
V
I6
–3
I10
–10
mA
I24
–2
mA
420
mW
720
mW
Pd max
TA ≤ 50°C, Independent IC
*: Mounted on a printed circuit board
mA
Operating temperature
Topr
–20 to +70
°C
Storage temperature
Tstg
–55 to +150
°C
Note: When mounted on a 65 × 72 × 1.6 mm paper/phenolic resin printed circuit board.
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
D1401RM (OT) No. 6803-1/14
LA7567GM
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
VCC
Operating supply voltage range
VCC op
Conditions
Ratings
Unit
5
V
4.5 to 5.5
V
Electrical Characteristics at Ta = 25°C, VCC = 5.0 V, fp = 45.75 MHz
Parameter
Symbol
Conditions
Ratings
min
typ
Unit
max
[VIF Block]
Circuit current
I5
Maximum RF AGC voltage
V14H
Minimum RF AGC voltage
V14L
Input sensitivity
AGC range
Maximum allowable input
No-signal state video output voltage
Synchronizing signal tip voltage
Video output level
VIN
S1 = OFF
40
47.5
VCC – 0.5
VCC
27
54.5
V
0
0.5
V
33
39
dBµV
GR
53
58
dB
VIN max
90
96
dBµV
V6
2.1
2.4
2.7
V6 tip
0.7
1.0
1.3
V
VO
0.95
1.1
1.25
Vp-p
V
Black noise threshold voltage
VBTH
0.5
0.8
1.1
Black noise clamp voltage
VBCL
1.2
1.5
1.8
Video signal-to-noise ratio
S/N
48
52
C-S beat
IC-S
Frequency characteristics
fC
6 MHz
V
V
dB
38
43
dB
–3.0
–1.5
dB
Differential gain
DG
3.0
6.5
Differential phase
DP
3
5
No-signal state AFT voltage
mA
%
deg
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
Sf
14
21
28
AFT detection sensitivity
VIF input resistance
RIN
45.75 MHz
1.5
VIF input capacitance
CIN
45.75 MHz
3
APC pull-in range (U)
fPU
APC pull-in range (L)
0.7
fPL
V
mV/kHz
kΩ
pF
1.5
MHz
–2.0
–1.4
AFT tolerance frequency 1
dfa1
–200
0
+200
VCO1 maximum variability range (U)
dfu
1.0
1.5
VCO1 maximum variability range (L)
dfl
–2.0
–1.4
MHz
VCO control sensitivity
B
1.2
3.2
5.0
kHz/mV
VS
25.0
28.5
31.5
%
Sync ratio
MHz
kHz
MHz
[First SIF Block]
Conversion gain
VG
27
33
39
dB
4.5 MHz output level
SO
53
115
180
mVrms
8
First SIF maximum input
SIN max
16
mVrms
First SIF input resistance
RIN (SIF)
41.25 MHz
2
kΩ
First SIF input capacitance
CIN (SIF)
41.25 MHz
3
pF
[SIF Block]
Limiting sensitivity
Vli (lim)
FM detector output voltage
VO (FM)
AMR rejection ratio
AMR
Total harmonic distortion
THD
SIF S/N
4.5 MHz ±25 kHz *
44
50
56
dBµV
350
450
570
mVrms
50
60
0.3
S/N (FM)
59
65
V max
110
116
dB
0.8
%
122
dBµV
[SIF Converter]
Maximum output level
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. 6803-2/14
LA7567GM
Pin Assignment
2nd SIF INPUT
1
24 FM DET OUT
BIAS FILTER
2
23 FM FILTER
Pd max — Ta
800
22 1st SIF OUT
(NICAM OUT)
4
CER.OSC
VCC
5
VIDEO OUT
6
Allowable power dissipation, Pd max — W
3
MIX OUT
21 RF AGC VR
20 GND
19 VIF
LA7567GM
EQ FILTER
7
18 VIF
EQ INPUT
8
17 IF AGC FILTER
APC FILTER
9
16 1st SIF AGC FILTER
VIDEO DET OUT 10
15 1st SIF INPUT
VCO COIL 11
14 RF AGC OUT
VCO COIL 12
13 AFT OUT
Mounted on a printed circuit board
720
700
600
500
Independent IC
420
400
300
200
100
0
-20
0
20
40
60
70
80
100
Ambient temperature, Ta — °C
Top view
A13679
Internal Equivalent Circuit and External Components
20
19
18
16
1kΩ
100kΩ
0.01µF
100kΩ
13
2kΩ
1kΩ
500Ω
1kΩ
10kΩ
6kΩ
3.3kΩ
14
AFT
OUTPUT
2kΩ
620Ω
30pF
15
1kΩ
1kΩ
1kΩ
2kΩ
17
0.01µF
0.01µF
0.022µF
21
1kΩ
SAW
(S)
1kΩ
22
30kΩ
SAW(P)
100Ω
23
IF
IN PUT
9V
RF AGC
OUT PUT
10kΩ-B
+
24
0.01µF
1µF
0.01µF
7.5kΩ
300Ω
V
400Ω
1kΩ 2kΩ
400Ω
330Ω
5
6
7
200Ω
9.2kΩ
4
8
9
10
11
12
10kΩ
+
150Ω
0.47µF
+
3kΩ
BPF
6MHz
3
0.01µF
2
1V
100µF
1
1.2kΩ
V
18kΩ
200Ω
V
10kΩ
1kΩ
1.2kΩ
1kΩ 1kΩ
0.47 to 1µF
AUDIO
OUT PUT
RFAGC
VR
330Ω
VCO
COIL
VCC
GND
VIDEO
OUT
T00134
No. 6803-3/14
LA7567GM
AC Characteristics Test Circuit
1st SIF IN
VIF IN
23
22
21
20
RF
AGC
FM
DET
19
18
VIF
AMP
IF
AGC
16
15
14
100kΩ
1000pF
0.01µF
0.01µF
0.01µF
17
RF AGC
OUT
(F)
AFT
OUT
(B)
100kΩ
24
GND
0.01µF
1µF
(M)
0.01µF
+
30kΩ
51Ω
IF AGC
0.01µF
7.5kΩ
10kΩ-B
0.01µF
RF AGC
VR
FM DET OUT
(D)
9V
51Ω
0.01µF
(M)
1st SIF OUT
(NICAM OUT)
13
1st
AMP
AGC
VIDEO
DET
1st
DET
AFT
HPF
LIM
AMP
HPF
MIX
HPF
VCO
8
150Ω
1.5kΩ
0.01µF
+
VIDEO
OUT
(A)
CONV.OUT
(E)
9
10
11
0.47µF
7
330Ω
12
24pF
560Ω
2nd SIF IN
6
100kΩ
1µF
+
5
+
S 2 10kΩ
51Ω
4
S1
3
10kΩ
2
0.01µF
1
EQ
AMP
VCC
GND
T00135
Test Circuit
Impedance
analyzer
23
22
21
20
19
18
16
15
14
13
8
9
10
11
12
100kΩ
0.01µF
17
100kΩ
0.01µF
0.01µF
0.01µF
0.01µF
0.01µF
10kΩ
0.01µF
0.01µF
0.01µF
24
0.01µF
1st SIF IN
VIF IN
LA7567GM
4
5
6
7
330Ω
3
+
100µF
0.01µF
10kΩ
2
0.01µF
1
VCC
T00136
No. 6803-4/14
LA7567GM
Application Circuit Diagrams
NT (US) SPLIT
IN PUT
24
23
22
21
20
19
18
0.01µF
1kΩ
RF
AGC
FM
DET
(M)
0.022µF
17
VIF
AMP
IF
AGC
16
15
14
13
100kΩ
1µH
10kΩ-B
1µF
(M)
0.01µF
AF OUT
GND
+
0.01µF
SAW(P)
7.5kΩ
9V
30kΩ
RF AGC
OUT
AFT
OUT
100kΩ
SAW
(S)
1000pF
TSF1241
1st
AMP
AGC
VIDEO
DET
1st
DET
AFT
HPF
LIM
AMP
HPF
MIX
HPF
7
8
9
330Ω
10
11
12
560Ω
6
0.47µF
5
+
150Ω
1µF
BPF
4
VCO
0.01µF
3
100µF
2
+
10kΩ
1
EQ
AMP
15µH
2.2kΩ
330Ω
VCC
GND
VIDEO
OUT
T00138
JAPAN SPLIT
IN PUT
22
21
20
RF
AGC
FM
DET
19
18
17
VIF
AMP
IF
AGC
0.01µF
16
15
14
13
100kΩ
AFT
OUT
100kΩ
23
1kΩ
0.01µF
10kΩ-B
1µF
(M)
0.01µF
24
9V
30kΩ
RF AGC
OUT
SAW(P)
GND
+
(M)
0.022µF
7.5kΩ
1st
AMP
AGC
VIDEO
DET
1st
DET
AFT
HPF
LIM
AMP
HPF
BPF
330Ω
7
8
9
10
11
12
560Ω
6
0.47µF
5
+
VCO
150Ω
4
0.01µF
3
100µF
2
+
10kΩ
1
EQ
AMP
15µH
330Ω
2.2kΩ
MIX
HPF
1µF
AF OUT
SAW
(S)
1000pF
TSF1137
VCC
GND
VIDEO
OUT
T00139
No. 6803-5/14
LA7567GM
NT (US) INTER
IN PUT
TSF5220
23
21
20
RF
AGC
FM
DET
19
18
1000pF
0.01µF
(M)
0.022µF
10kΩ-B
22
17
VIF
AMP
IF
AGC
16
15
14
13
AFT
OUT
100kΩ
24
SAW(P)
GND
62pF
1µF
+
(M)
0.01µF
1st
AMP
AGC
VIDEO
DET
1st
DET
AFT
* INTER
16PIN
GND
HPF
LIM
AMP
HPF
BPF
330Ω
7
8
9
10
11
12
560Ω
6
0.47µF
5
+
VCO
150Ω
4
0.01µF
3
100µF
2
+
100kΩ
1
EQ
AMP
15µH
330Ω
2.2kΩ
MIX
HPF
1µF
AF OUT
22µH
7.5kΩ
100kΩ
9V
30kΩ
RF AGC
OUT
VCC
GND
VIDEO
OUT
T00140
No. 6803-6/14
LA7567GM
Sample Application Circuit
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.
Connect pin 2 to ground through a 2-kΩ resistor.
• 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.
Insert a 0.01-µF capacitor between pin 21 and ground for oscillation prevention.
IN PUT
TSF5315
100kΩ
SAW
(S)
SAW(P)
1kΩ
24
23
22
21
20
RF
AGC
FM
DET
19
AFT
OUT
(M)
GND
18
17
VIF
AMP
IF
AGC
16
15
14
13
1st
AMP
AGC
VIDEO
DET
1st
DET
AFT
HPF
LIM
AMP
HPF
7
8
9
10
11
12
560Ω
6
0.47µF
5
+
VCO
150Ω
4
0.01µF
3
100µF
2
2kΩ
1
EQ
AMP
15µH
330Ω
2.2kΩ
MIX
HPF
VCC
GND
VIDEO
OUT
T00141
No. 6803-7/14
LA7567GM
Pin Descriptions
Pin No.
1
Pin
SIF INPUT
Description
Equivalent circuit
• SIF input. The input impedance is about 1 kΩ. Since
buzzing and buzz beating can occur if interference enters
this input pin, care must be taken when design the pattern
layout for this pin. Note that the video and chrominance
signals are especially likely to interfere with the audio
signal. Also, the VIF carrier signal can also cause
interference.
1
1kΩ
1kΩ
A13680
3.6V
5kΩ
5kΩ
2
FM power supply filter
• FM detector bias line filter input. Used to improve the FM
detector signal-to-noise ratio.
C1 should be at least 0.47 µF, and 1 µF is recommended.
If the FM detector is not used, connect pin 2 to ground
through a 2-kΩ resistor. This stops the FM detector VCO.
2
18kΩ
C1
A13681
3
3
4
SIF converter
200Ω
10kΩ
• Pin 3 is the SIF converter output. The signal is passed
through a 6-MHz bandpass filter and input to the SIF
circuit.
4
A12030
400Ω
4(R)
A13682
5
VCC
• Use the shortest distance possible when decoupling VCC
and ground.
Continued on next page.
No. 6803-8/14
LA7567GM
Continued from preceding page.
Pin No.
Pin
Description
Equivalent circuit
• Equalizer circuit. This circuit is used to correct the video
signal frequency characteristics.
Pin 8 is the EQ amplifier input. This amplifier amplifies a
1.5-V p-p video signal to 2-V p-p.
2kΩ
• Notes on equalizer amplifier design
The equalizer amplifier is designed as a voltage follower
amplifier with a gain of about 0 dB. When used for
frequency characteristics correction, a capacitor, inductor,
and resistor must be connected in series between pin 7
and ground.
EQ amp
EQ OUTPUT
7
• Approach used in the equalizer amplifier
If vi is the input signal and vo is the output signal, then:
6
7
8
6
1kΩ
C
L =Z
R1
—— +1 (vi + vin) = Vo × G
2
R
Where G is the voltage-follower amplifier gain.
Assume:
vin: Imaginary short
G: About 0 dB
vin ≈ 0.
Then:
voG
R1
AV = —— = —— +1
vi
Z
• R1 is the IC internal resistance, and is 1 kΩ. In the
application design, simply select Z to correspond to the
desired characteristics. However, since the EQ amplifier
gain will be maximum at the resonant point defined by Z,
care is required to assure that distortion does not occur.
A13683
EQ INPUT
8
200Ω
AGC
A13684
FROM
APC DET
9
APC FILTER
• PLL detector APC filter connection. The APC time constant
is switched internally in the IC. When locked, the VCO is
controlled by loop A and the loop gain is reduced. When
unlocked and during weak field reception, the VCO is
controlled by loop B and the loop gain is increased.
A
1kΩ
1kΩ
1kΩ
For this APC filter we recommend:
R = 150 to 390 Ω
C = 0.47 µF
B
9
R
+
C
A13685
Continued on next page.
No. 6803-9/14
LA7567GM
Continued from preceding page.
Pin No.
Pin
Description
Equivalent circuit
2kΩ
Composite video output
10
15pF
2pF
10
• Output for the video signal that includes the SIF carrier.
A resistor must be inserted between pin 10 and ground to
acquire adequate drive capability.
R ≥ 430 Ω
A13686
11
11
12
VCO tank
12
• VCO tank circuit used for video signal detection.
See the coil specifications provided separately for details
on the tank circuit. This VCO is a vector synthesis VCO.
A13687
13
AFT OUTPUT
• AFT output. The AFT center voltage is generated by an
external bleeder resistor. The AFT gain is increased by
increasing the resistance of this external bleeder resistor.
However, this resistor must not exceed 390 kΩ.
This circuit includes a control function that controls the AFT
voltage to naturally approach the center voltage during
weak field reception.
13
A13688
9V
14
RF AGC OUTPUT
• RF AGC output. This output controls the tuner RF AGC.
A protective 100-Ω resistor is inserted in series with the
open collector output. Determine the external bleeder
resistor value in accordance with the specifications of the
tuner.
To tuner
14
100Ω
A13689
15
1st SIF INPUT
• First SIF input. A DC cut capacitor must be used in the
input circuit.
• If a SAW filter is used:
The first SIF sensitivity can be increased by inserting an
inductor between the SAW filter and the IC to neutralize the
SAW filter output capacitance and the IC input
capacitance.
2kΩ
2kΩ
• When used in an intercarrier system:
This pin (pin 15) may be left open.
15
A13690
Continued on next page.
No. 6803-10/14
LA7567GM
Continued from preceding page.
Pin No.
16
Pin
1st SIF AGC FILTER
Description
Equivalent circuit
• First SIF AGC filter connection.
This IC adopts an average value AGC technique. The first
SIF conversion gain is about 30 dB, and the AGC range is
over 50 dB. A 0.01 µF capacitor is normally used in filter
connected to this pin.
• When used in an intercarrier system:
Connect this pin (pin 16) to ground. The IC internal switch
will operate to connect the intercarrier output to the SIF
converter input.
1kΩ
1kΩ
INTER/SPLIT SW
LO=INTER
16
17
IF AGC FILTER
• IF AGC filter connection
The signal peak-detected by the built-in AGC detector is
converted to the AGC voltage at pin 17. Additionally, a
second AGC filter (a lag-lead filter) used to create the dual
time constants is provided internally in the IC.
Use a 0.022-µF capacitor as the external capacitor, and
adjust the value according to the sag, AGC speed, and
other characteristics.
A13691
1kΩ
17
A13692
18
18
19
VIF input
• VIF amplifier input.
The input circuit is a balanced circuit, and the input circuit
constants are:
R ≈ 1.5 kΩ
C ≈ 3 pF
19
A13693
20
GND
Continued on next page.
No. 6803-11/14
LA7567GM
Continued from preceding page.
Pin No.
Pin
Description
Equivalent circuit
4.2V
21
RF AGC VR
• RF AGC VR connection.
This pin sets the tuner RF AGC operating point. Also, the
FM output and the video output can both be muted at the
same time by connecting this pin to ground.
20kΩ
20kΩ
560Ω
21
A13694
• First SIF output.
Internally, this is an emitter-follower output with a 600-Ω
resistor attached. When used in an intercarrier system, the
buzz characteristics can be improved by forming a
chrominance carrier trap with this pin.
22
20kΩ
20kΩ
NICAM output
620Ω
22
6kΩ
Forms a chrominance killer trap.
A13695
23
FM filter
22
• Connection for a filter used to hold the FM detector output
DC voltage fixed. Normally, a 1-µF electrolytic capacitor
should be used. The capacitance should be increased if
the low band (around 50 Hz) frequency characteristics
need to be improved.
• 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.
1kΩ
1kΩ
23
R
+
C
A13696
24
FM Detector output
• Audio FM detector output. A 300-Ω resister is inserted in
series with an emitter-follower output.
• For applications that support stereo:
Applications that input this signal to a stereo decoder may
find that the input impedance is reduced, the left and right
signals are distorted, and that the stereo characteristics are
degraded. If this problem occurs, add a resistor between
pin 24 and ground.
R1 ≥ 5.1 kΩ
• For applications that support mono:
Create an external deemphasis circuit.
t = C × R2
R2
C
R1
24
300Ω
3.3kΩ
A13697
No. 6803-12/14
LA7567GM
Notes on Sanyo SAW Filters
There are two types of SAW filters, which differ in the piezoelectric substrate material, 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 small 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.
SAW filter
characteristics
The high band is reduced
The high band is extended
Frequency
Frequency
A13698
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=5t
0.12 ø
C = 24 pF
S
PAL f = 38.9 MHz
t=6t
0.12 ø
C = 24 pF
S
t=7t
0.12 ø
C = 24 pF
S
VCO coil
A12048
SAW filter
(SPLIT)
A12049
A12050
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
TSF1137U
Sound
Picture
TSF1241
Sound
Picture
TSF5315
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
No. 6803-13/14
LA7567GM
Notes on VCO Tank Circuits
• 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 circuit'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.
• 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 so 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 December, 2001. Specifications and information herein are
subject to change without notice.
PS No. 6803-14/14