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Ordering number :ENN6100A
Monolithic Linear IC
LA7565E, 7565KM
IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products
Overview
The LA7565E and LA7565KM are PAL/NTSC multisystem 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.
Features
* 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 3067-DIP24S
[LA7565E]
24 13 24
unit: mm 3112-MFP24S
[LA7565KM]
13
7.62 6.4
0.25
1 21.2
12
3.9max
3.25
12.6 1.5
0.15
0.51min
3.3
0.81
1.78
0.48
0.95
0.35
1.0 0.8
0.1
SANYO: DIP24S
SANYO: MFP24S
Specifications
Maximum Rating at Ta = 25C
Parameter Maximum supply voltage Circuit voltage Symbol VCC max V13, V17 I6 Circuit current I10 I24 (LA7565E) Allowable power dissipation Pd max Ta 68C (LA7565KM) Ta 50C, independent IC (LA7565KM) * Mounted on a printed circuit board Operating temperature Storage temperature Topr Tstg Conditions Ratings 10 VCC -3 -10 -2 720 420 720 -20 to +70 -55 to +150 Unit V V mA mA mA mW mW mW C C
Note: * When mounted on a 65 x 72 x 1.6 mm epoxy glass laminate printed circuit board.
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating supply voltage Symbol VCC VCC op Conditions Ratings 9 8.5 to 9.5 Unit V V
No. 6100-2/18
0.625
1
12
1.8max
6.35 7.6
5.4
LA7565E, 7565KM Electrical Characteristics at Ta = 25C, VCC = 9 V, fp = 38.9 MHz
Parameter [VIF Block] Circuit current Maximum RF AGC voltage Minimum RF AGC voltage Input sensitivity AGC range Maximum allowable input No-signal video output voltage Synchronizing signal tip voltage Video output level Black noise threshold voltage Black noise clamp voltage Video S/N ratio C-S beat Frequency characteristics Differential gain Differential phase 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] Conversion gain 5.5 MHz output level First SIF maximum input First SIF input resistance First SIF input capacitance [SIF Block] Limiting voltage FM detector output voltage AM rejection ratio Total harmonic distortion SIF S/N ratio [SIF Converter] Conversion gain Maximum output level Carrier suppression ratio Oscillator level Oscillator leakage Oscillator stopped current VG (SIF) V max VGR (5.5) VOSC OSCleak I4 8 7 102 14 11 108 26 70 24 300 14 111 dB dBV dB mVp-p dB A Vi (lim) VO (FM) AMR THD S/N (FM) 57 5.5 MHz 30 kHz* 43 720 50 48 900 60 0.3 62 0.8 53 1100 dBV mVrms dB % dB VG SO Si max Ri (SIF) Ci (SIF) 33.4 MHz 33.4 MHz 37.5 46 112 43.0 100 223 2 3 49.5 150 dB mVrms mVrms k pF I5 V14H V14L VIN GR VIN max V6 V6 tip VO VBTH VBCL S/N IC-S fC DG DP V13 V13H V13L Sf Ri Ci fPU fPL dfa 1 dfu dfl B 0.9 -300 1.0 38.9 MHz 38.9 MHz 0.8 3.5 8.0 0 25 6 MHz S1 = OFF 26 62 92 3.5 1.15 1.7 0.5 2.5 48 38 -3.0 37.4 7.5 44 8.1 0 32 68 97 3.8 1.45 2.0 0.8 2.8 50 43 -1.5 3.0 3 4.4 8.7 0.18 36 1.5 3 1.3 -1.5 0 1.3 -1.5 1.8 -1.0 3.6 -0.8 +300 6.5 5 5.5 9.0 1.00 47 4.2 1.74 2.3 1.1 3.1 0.5 38 50.6 mA V V dBV dB dBV V V Vp-p V V dB dB dB % deg V V V mV/kHz k pF MHz MHz kHz MHz MHz kHz/mV Symbol Conditions Ratings min typ max Unit
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
800
Pd max - Ta
[LA7565E] Allowable power dissipation, Pdmax - mW
800
720
Pd max - Ta
[LA7565KM]
Allowable power dissipation, Pdmax - mW
Mounted on a 65 x 72 x 1.6 mm printed circuit board
700 600 500 400 300 200 100
720
700 600 500
Independent IC
400 300 200 100 0 -20
420
0 -20
0
20
40
60
68
80
100
0
20
40
60
70
80
100
Ambient temperature, Ta - C
Ambient temperature, Ta - C
Pin Assignment
1st SIF AGC FILTER
IF AGC FILTER
1st SIF INPUT
1st SIF OUT (NICAM OUT)
RF AGC OUT 14
FM DET OUT
RF AGC VR
FM FILTER
24
23
22
21
20
19
18
17
16
15
13
LA7565E/7565KM
AFT OUT
GND
VIF
VIF
1 2nd SIF INPUT
2 BIAS FILTER
3 MIX OUT
4 CER.OSC
5 VCC
6 VIDEO OUT
7 EQ FILTER
8 EQ INPUT
9 APC FILTER
10 VIDEO DET OUT
11 VCO COIL
12 VCO COIL
Top view
A12051
No. 6100-4/18
LA7565E, 7565KM Internal Equivalent Circuit and External Circuit Diagram
IF IN PUT AUDIO OUT PUT RFAGC VR 50 k-B 0.01 F 5.6 k 0.01 F 1 F SAW(P) 0.022 F 0.01 F 0.01 F 0.01 F SAW (S) RF AGC OUT PUT 100 k
24
23
1 k
22
21
20
19
18
2 k
17
16
1 k
15
14
100
13
1 k
300
1 k
1 k
1 k
30 pF 6 k
500
10 k
V
10 k
1 k
1 k 1 k
1.2 k
20 k
2 k
620
1 k
2 k
1 k
10 k
V
V 400 3 k 200 400 1V 9.2 k 200 1 k 2 k
1
2
0.47 to 1 F
3
4
68
5
6
7
8
0.47 F
9 +
150
10
11
68
100 F
330
+
0.01 F
BPF 6MHz
3 k
330
VCO COIL VCC GND
VIDEO OUT
1.2 k
12
100 k
+
AFT OUTPUT
T00049
No. 6100-5/18
LA7565E, 7565KM AC Characteristics Test Circuit
VIF IN 1st SIF OUT (NICAM OUT) RF AGC VR 0.01 F 50 k-B FM DET OUT (D) 5.6 k 1 F 51 1st SIF IN 51 1000 pF 100 k
IF AGC
RF AGC OUT (F) 0.01 F 0.01 F
0.01 F
0.01 F
(M) 0.01 F
+ 23 22
0.01 F
GND
0.01 F (M)
24
21
20
19
18
17
16
15
14
13
FM DET
RF AGC
IF AGC
VIF AMP
AGC
1st AMP
VIDEO DET
1st DET
AFT
HPF LIM AMP HPF MIX HPF EQ AMP VCO
1
0.01 F 51
2
3
S 2 10 k
4
100 F 68
5 +
0.01 F
6
100 k
7
8 +
150
9
0.47 F
10
11
24 pF
12
1 F
+
2nd SIF IN
S1
CONV.OUT (E)
VIDEO OUT (A)
560
330
100 k
AFT OUT (B)
VCC GND
T00053
Test Circuit
Impedance analyzer
VIF IN 0.01 F 0.01 F 10 k 1st SIF IN 0.01 F
0.01 F
0.01 F
0.01 F
0.01 F
0.01 F
0.01 F
0.01 F
100 k
24
23
22
21
20
19
18
17
16
15
14
13
LA7565E/7565KM
1
0.01 F
2
3
10 k
4
5
6
7
330
8
9
10
11
12
0.01 F
100 k VCC
T00054
100 F
+
No. 6100-6/18
LA7565E, 7565KM Sample Application Circuit PAL SPLIT
IN PUT TSF5315 SAW (S) RF AGC OUT
1 F
50 k-B
(M) 0.022 F
(M) 0.01 F
AF OUT
0.01 F
5.6 k
+
GND
SAW(P)
0.01 F 1000 pF
100 k
AFT OUT
24
23
22
21
20
19
18
17
16
15
14
13
FM DET
RF AGC
IF AGC
VIF AMP
AGC
1st AMP
VIDEO DET
1st DET
AFT
HPF LIM AMP HPF MIX HPF EQ AMP VCO
1 +
BPF
2
3
4
100 F 68
5 +
0.01 F
6
7
8
150
9
0.47 F
10
560
11
12
330
15 H 330 VCC (9V) GND VIDEO OUT
T00048
NT (US) SPLIT
IN PUT TSF1241 SAW(P) 1 F 50 k-B (M) 0.022 F (M) 0.015 F AF OUT 0.01 F 5.6 k SAW (S) RF AGC OUT
+
GND
1 H 1 k
0.01 F 1000 pF
100 k
2.2 k
100 k
AFT OUT
24
23
22
21
20
19
18
17
16
15
14
13
FM DET
RF AGC
IF AGC
VIF AMP
AGC
1st AMP
VIDEO DET
1st DET
AFT
HPF LIM AMP HPF MIX HPF EQ AMP VCO
1 +
BPF
2
1 F
3
10 k
4
100 F
5 +
0.01 F
6
7
8
150
9
0.47 F
10
560
11
12
330
15 H 330 VCC (9V) GND VIDEO OUT
T00046
2.2 k
100 k
No. 6100-7/18
LA7565E, 7565KM JAPAN SPLIT
IN PUT TSF1137 SAW (S) RF AGC OUT
1 F
50 k-B
(M) 0.022 F
(M) 0.015 F
AF OUT
24
23
22
21
20
19
18
17
16
15
14
13
FM DET
RF AGC
IF AGC
VIF AMP
AGC
1st AMP
VIDEO DET
1st DET
AFT
HPF LIM AMP HPF MIX HPF EQ AMP VCO
1 +
BPF
2
1 F
3
10 k
4
100 F
5 +
0.01 F
6
7
8
150
9
0.47 F
10
560
11
12
330
15 H 330 VCC (9 V) GND VIDEO OUT
T00045
NT (US) INTER
IN PUT TSF5220 0.01 F 1000 pF 100 k RF AGC OUT 62 pF 22 H 1 F 50 k-B (M) 0.022 F 5.6 k (M) 0.015 F
AF OUT
+
GND
SAW(P)
2.2 k
100 k
1 k
0.01 F
5.6 k
+
GND
SAW(P)
0.01 F 1000 pF
100 k
AFT OUT
AFT OUT
24
23
22
21
20
19
18
17
16
15
14
13
FM DET
RF AGC
IF AGC
VIF AMP
AGC
1st AMP
VIDEO DET
1st DET
AFT
100 k
*INTER 16PIN GND
HPF LIM AMP HPF MIX HPF EQ AMP VCO
1 +
BPF
2
1 F
3
100 k
4
100 F
5 +
0.01 F
6
7
8
150
9
0.47 F
10
560
11
12
330
15 H 330 VCC (9V) GND VIDEO OUT
T00047
2.2 k
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-k 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-k resistor and a 0.01-F 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-F capacitor must be inserted between pin 21 and ground to prevent oscillation.
IN PUT TSF5315 SAW (S) 100 k
GND
SAW(P) 1 k (M)
AFT OUT
24
23
22
21
20
19
18
17
16
15
14
13
FM DET
RF AGC
IF AGC
VIF AMP
AGC
1st AMP
VIDEO DET
1st DET
AFT
HPF LIM AMP HPF MIX HPF EQ AMP VCO
1
2 k
2
3
4
100 F
5 +
0.01 F
6
7
8
150
9
0.47 F
10
560
11
12
15 H 330 VCC GND VIDEO OUT
T00044
2.2 k
No. 6100-9/18
LA7565E, 7565KM Pin Functions
Pin No. Pin Pin function Equivalent circuit
1
SIF INPUT
The input impedance is about 1 k. 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 k 1 k
A12052
4.2V 24 k
2
FM power supply filter
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 F or greater, and 1 F is recommended. A 2-k resistor must be inserted between pin 2 and ground if the FM detector is not used. This stops the FM detector VCO.
2
4 k C1
TO VCO BIAS
14 k
A12053
3 4
SIF converter
Pin 3 is the SIF converter output. This signal is passed through a 6-MHz band-pass filter and input to the SIF circuit. A 200- resistor is inserted in series with the emitter-follower output. 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-k 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
200
500 kHz 68
4
A12054
400 400
A12055
Continued on next page. No. 6100-10/18
LA7565E, 7565KM
Continued from preceding page.
Pin No. 5 VCC Pin Pin function V CC and ground should be decoupled with as small a separation as possible. Equivalent circuit
2 k
1 k
6
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. * Using the equalizer amplifier If vi is the input signal and vo is the output signal, then: R1/Z + 1 (vi + vin) = Vo x G Where, G: Gain of the voltage follower amplifier vin: Imaginary short 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 k. 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.
9.2 k
7
C L =Z R
A12056
6 7 8
EQ amp
EQ INPUT
8
200 AGC
A12057
9
APC filter
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. We recommend values of: R = between 150 and 390 , and C = 0.47 F for this APC filter.
FROM APC DET A 1 k 1 k 1 k
B
9
A12058
Continued on next page.
No. 6100-11/18
LA7565E, 7565KM
Continued from preceding page.
Pin No. Pin Pin function Equivalent circuit
2 k
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. R 300
10
Composite video output
15 pF 2 pF
10
A12059
11
11 12 VCO tank 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.
12
A12060
13
AFT output
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 k. This circuit includes a control function that naturally brings the AFT voltage to its center value under weak field reception conditions.
13
A12061
14
RF AGC output
This output controls the tuner RF AGC. There is a 200- series protection resistor inserted in the emitter output. Determine the value of the external bleeder resistor based on the characteristics of the tuner used.
to tuner
14
100 20 k 60 k
A12062
Continued on next page.
No. 6100-12/18
LA7565E, 7565KM
Continued from preceding page.
Pin No. Pin Pin function Equivalent circuit
15
First SIF input
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. * When used with an intercarrier sound system: This pin may be left open.
2 k
2 k
15
A12063
16
First SIF AGC filter
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 F is normally used as the filter connected to this pin. * 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.
1 k
1 k
INTER/SPLIT SW LO=INTER
16
A12064
17
IF AGC filter
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. A 0.022-F 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
1 k
Continued on next page.
No. 6100-13/18
LA7565E, 7565KM
Continued from preceding page.
Pin No. Pin Pin function Equivalent circuit
18
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 k C 3 pF
VIF input
19
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
20 k
21
A12067
A 600- 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 k 20 k 620
22
First SIF output
22
6 k
Construct a chrominance carrier trap here.
A12068
22
Continued on next page.
560
20 k
No. 6100-14/18
LA7565E, 7565KM
Continued from preceding page.
Pin No. Pin Pin function Equivalent circuit
23
FM filter
Connection for a filter used to hold the FM detector output at a fixed DC voltage. Normally, a 1-F electrolytic capacitor is used. If the low area (around 50 Hz) frequency characteristics are seen as a problem, this capacitance should be increased. 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.
1 k
1 k
23
R
C
+
A12069
24
FM detector output
Audio FM detector output. A resistance of 200 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 k C * In applications that support mono: Attach an external de-emphasis circuit with the following time constant. t = CR2
R2
24
300 10 k
R1
A12070
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 s s ****** Japan TSF12 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 ****** US TSF53 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.
SAW filter characteristics The high band is reduced The high band is extended
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 f = 58.75 MHz US f = 45.75 MHz PAL f = 38.9 MHz
S
t=5t 0.12 o C = 24 pF
A12072
S
t=6t 0.12 o C = 24 pF
A12073
S
t=7t 0.12 o C = 24 pF
A12074
VCO coil
Test production no. V291XCS-3220Z Toko Co., Ltd.
Test production no. 291XCS-3188Z Toko Co., Ltd.
Test production no. 292GCS-7538Z Toko Co., Ltd.
SAW filter (SPLIT)
Picture TSF1137U Sound
Picture TSF1241 Sound
Picture TSF5315 Sound
SAW filter (INTER)
TSF5220 TSF5221
TSF5321 TSF5344
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

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