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 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. • 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 3067-DIP24S 3112-MFP24S [LA7565E] 24 [LA7565KM] 13 24 1 6.35 7.6 5.4 0.25 7.62 6.4 13 12 0.81 0.48 1.78 3.3 12 0.15 0.1 1.5 12.6 0.625 3.25 3.9max 0.51min 1 1.8max 21.2 0.35 0.95 1.0 0.8 SANYO: MFP24S SANYO: DIP24S Specifications Maximum Rating at Ta = 25°C Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCC max 10 V Circuit voltage V13, V17 VCC V I6 –3 Circuit current I10 –10 mA I24 –2 mA (LA7565E) Allowable power dissipation Pd max Ta ≤ 68°C (LA7565KM) Ta ≤ 50°C, independent IC (LA7565KM) * Mounted on a printed circuit board mA 720 mW 420 mW 720 mW Operating temperature Topr –20 to +70 °C Storage temperature Tstg –55 to +150 °C Ratings Unit 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 VCC op Conditions 9 V 8.5 to 9.5 V No. 6100-2/18 LA7565E, 7565KM Electrical Characteristics at Ta = 25°C, VCC = 9 V, fp = 38.9 MHz Parameter Symbol Conditions Ratings min typ Unit max [VIF Block] Circuit current I5 37.4 44 Maximum RF AGC voltage V14H 7.5 8.1 Minimum RF AGC voltage V14L Input sensitivity VIN AGC range Maximum allowable input S1 = OFF 26 50.6 mA V 0 0.5 V 32 38 dBµV GR 62 68 dB VIN max 92 97 dBµV No-signal video output voltage V6 3.5 3.8 4.2 V Synchronizing signal tip voltage V6 tip 1.15 1.45 1.74 V Video output level VO 1.7 2.0 2.3 Vp-p Black noise threshold voltage VBTH 0.5 0.8 1.1 V Black noise clamp voltage VBCL 2.5 2.8 3.1 Video S/N ratio S/N 48 50 C-S beat IC-S Frequency characteristics fC 6 MHz V dB 38 43 dB –3.0 –1.5 dB Differential gain DG 3.0 6.5 Differential phase DP 3 5 % deg No-signal AFT voltage V13 3.5 4.4 5.5 Maximum AFT voltage V13H 8.0 8.7 9.0 V Minimum AFT voltage V13L 0 0.18 1.00 V 36 47 AFT detection sensitivity Sf VIF input resistance Ri 38.9 MHz 1.5 VIF input capacitance Ci 38.9 MHz 3 APC pull-in range (U) fPU APC pull-in range (L) AFT tolerance frequency 1 25 0.8 fPL dfa 1 V mV/kHz kΩ pF 1.3 MHz –1.5 –0.8 –300 0 +300 1.0 1.3 MHz kHz VCO1 maximum frequency range (U) dfu MHz VCO1 maximum frequency range (L) dfl –1.5 –1.0 MHz VCO control sensitivity B 0.9 1.8 3.6 kHz/mV Conversion gain VG 37.5 43.0 49.5 dB 5.5 MHz output level SO 46 100 150 mVrms 112 223 [First SIF Block] First SIF maximum input Si max First SIF input resistance Ri (SIF) 33.4 MHz 2 mVrms kΩ First SIF input capacitance Ci (SIF) 33.4 MHz 3 pF [SIF Block] Limiting voltage Vi (lim) FM detector output voltage VO (FM) AM rejection ratio AMR Total harmonic distortion THD SIF S/N ratio S/N (FM) 5.5 MHz ± 30 kHz* 43 48 53 720 900 1100 50 60 0.3 57 dBµV mVrms dB 0.8 62 % dB [SIF Converter] Conversion gain Maximum output level Carrier suppression ratio Oscillator level Oscillator leakage Oscillator stopped current VG (SIF) 7 11 14 dB V max 102 108 111 dBµV VGR (5.5) 14 VOSC OSCleak I4 8 26 dB 70 mVp-p 24 dB 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 800 Allowable power dissipation, Pdmax – mW Allowable power dissipation, Pdmax – mW [LA7565E] Pd max - Ta 800 720 700 600 500 400 300 200 100 0 -20 0 20 40 60 68 80 100 Pd max - Ta [LA7565KM] Mounted on a 65 × 72 × 1.6 mm printed circuit board 720 700 600 500 Independent IC 420 400 300 200 100 0 -20 0 Ambient temperature, Ta – °C 20 40 60 70 80 100 Ambient temperature, Ta – °C FM DET OUT FM FILTER 1st SIF OUT (NICAM OUT) RF AGC VR GND VIF VIF IF AGC FILTER 1st SIF AGC FILTER 1st SIF INPUT RF AGC OUT AFT OUT Pin Assignment 24 23 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 2nd SIF INPUT BIAS FILTER MIX OUT CER.OSC VCC VIDEO OUT EQ FILTER EQ INPUT APC FILTER VIDEO DET OUT VCO COIL VCO COIL LA7565E/7565KM Top view A12051 No. 6100-4/18 LA7565E, 7565KM Internal Equivalent Circuit and External Circuit Diagram 19 18 16 1 kΩ 0.01 µF 0.01 µF 13 2 kΩ 1 kΩ 1 kΩ 10 kΩ 500 Ω 6 kΩ 10 kΩ 14 2 kΩ 620 Ω 30 pF 15 1 kΩ 1 kΩ 1 kΩ 2 kΩ 17 1 kΩ 20 0.01 µF 0.022 µF 21 AFT OUTPUT 20 kΩ 22 1 kΩ SAW (S) 100 kΩ SAW(P) 100 Ω 23 RF AGC OUT PUT 50 kΩ-B + 24 0.01 µF 1 µF 0.01 µF 5.6 kΩ 300 Ω V 400 Ω 330 Ω 5 6 8 9 10 11 12 150 Ω + 68 Ω + 7 0.47 µF 4 200 Ω 9.2 kΩ 68 Ω 3 3 kΩ BPF 6MHz 1V 0.01 µF 2 1 kΩ 2 kΩ 400 Ω 100 µF 1 1.2 kΩ V 3 kΩ 200 Ω V 10 kΩ 1 kΩ 1.2 kΩ 1 kΩ 1 kΩ 0.47 to 1 µF AUDIO OUT PUT 100 kΩ IF IN PUT RFAGC VR 330 Ω VCO COIL VCC GND VIDEO OUT T00049 No. 6100-5/18 LA7565E, 7565KM AC Characteristics Test Circuit 1st SIF IN VIF IN 22 21 20 RF AGC FM DET 19 18 16 15 14 13 100 kΩ 1000 pF 0.01 µF 0.01 µF 17 VIF AMP IF AGC RF AGC OUT (F) AFT OUT (B) 100 kΩ 23 0.01 µF 1 µF 24 GND 0.01 µF + 50 kΩ-B 0.01 µF 5.6 kΩ (M) 0.01 µF FM DET OUT (D) 51 Ω IF AGC 0.01 µF 51 Ω RF AGC VR 0.01 µF (M) 1st SIF OUT (NICAM OUT) 1st AMP AGC VIDEO DET 1st DET AFT HPF LIM AMP HPF MIX HPF 7 8 150 Ω 100 kΩ 0.01 µF 10 11 12 24 pF 330 Ω VIDEO OUT (A) CONV.OUT (E) 9 + 0.47 µF 6 VCO 560 Ω 2nd SIF IN 5 + S1 1 µF + S 2 10 kΩ 51 Ω 4 100 µF 3 68 Ω 2 0.01 µF 1 EQ AMP VCC GND T00053 Test Circuit Impedance analyzer 19 18 0.01 µF 0.01 µF 0.01 µF 17 16 15 14 13 9 10 11 12 100 kΩ 20 0.01 µF 0.01 µF 10 kΩ 21 100 kΩ 22 0.01 µF 23 0.01 µF 0.01 µF 0.01 µF 24 0.01 µF 1st SIF IN VIF IN LA7565E/7565KM 4 5 6 7 8 330 Ω 3 + 100 µF 0.01 µF 10 kΩ 2 0.01 µF 1 VCC T00054 No. 6100-6/18 LA7565E, 7565KM Sample Application Circuit PAL SPLIT 50 kΩ-B 23 22 21 20 RF AGC FM DET 19 18 0.01 µF 17 VIF AMP IF AGC 16 15 14 13 100 kΩ 1 µF 24 AFT OUT 100 kΩ GND + RF AGC OUT SAW(P) (M) 0.022 µF 5.6 kΩ (M) 0.01 µF AF OUT SAW (S) 0.01 µF 1000 pF IN PUT TSF5315 1st AMP AGC VIDEO DET 1st DET AFT HPF LIM AMP HPF MIX HPF 7 8 330 Ω BPF 9 10 11 12 560 Ω 6 + 0.47 µF 5 4 68 Ω 150 Ω 3 VCO 0.01 µF 2 + 100 µF 1 EQ AMP 15 µH 2.2 kΩ 330 Ω VCC (9V) GND VIDEO OUT T00048 NT (US) SPLIT 50 kΩ-B 1 µF 24 1 µH 23 22 1 kΩ 21 20 RF AGC FM DET 19 18 0.01 µF GND + (M) 0.022 µF 5.6 kΩ (M) 0.015 µF 17 VIF AMP IF AGC 16 15 14 13 AFT OUT 1st AMP AGC VIDEO DET 1st DET AFT HPF LIM AMP HPF BPF 330 Ω 7 8 9 10 11 12 560 Ω + 6 0.47 µF 5 VCO 150 Ω 4 0.01 µF + 3 100 µF 2 10 kΩ 1 EQ AMP 15 µH 330 Ω 2.2 kΩ MIX HPF 1 µF AF OUT 100 kΩ RF AGC OUT 100 kΩ SAW (S) SAW(P) 0.01 µF 1000 pF IN PUT TSF1241 VCC (9V) GND VIDEO OUT T00046 No. 6100-7/18 LA7565E, 7565KM JAPAN SPLIT 22 21 20 RF AGC FM DET 19 18 17 VIF AMP IF AGC 16 15 14 AFT OUT 100 kΩ 23 0.01 µF 1000 pF 50 kΩ-B 1 µF (M) 0.015 µF 24 1 kΩ 0.01 µF GND + RF AGC OUT SAW(P) (M) 0.022 µF 5.6 kΩ AF OUT SAW (S) 100 kΩ IN PUT TSF1137 13 1st AMP AGC VIDEO DET 1st DET AFT HPF LIM AMP HPF MIX HPF 7 8 150 Ω 330 Ω BPF 9 10 11 12 560 Ω 6 + 0.47 µF 5 VCO 0.01 µF 4 100 µF 3 10 kΩ 2 + 1 µF 1 EQ AMP 15 µH 2.2 kΩ 330 Ω VCC (9 V) GND VIDEO OUT T00045 NT (US) INTER IN PUT 22 21 20 RF AGC FM DET 19 18 17 VIF AMP IF AGC 16 15 14 13 100 kΩ AFT OUT 100 kΩ 23 (M) 0.022 µF 1 µF 24 GND 50 kΩ-B + 5.6 kΩ 1st AMP AGC VIDEO DET 1st DET AFT *INTER 16PIN GND HPF LIM AMP HPF BPF 330 Ω 7 8 9 10 11 12 560 Ω 6 0.47 µF 5 + VCO 150 Ω 4 0.01 µF 3 100 kΩ 2 + 100 µF 1 EQ AMP 15 µH 330 Ω 2.2 kΩ MIX HPF 1 µF (M) 0.015 µF AF OUT 62 pF 22 µH RF AGC OUT SAW(P) 0.01 µF 1000 pF TSF5220 VCC (9V) 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 100 kΩ SAW(P) (M) GND SAW (S) 1 kΩ 24 23 22 21 20 RF AGC FM DET 19 18 17 VIF AMP IF AGC 16 15 14 AFT OUT 13 1st AMP AGC VIDEO DET 1st DET AFT HPF LIM AMP HPF 7 8 9 10 11 12 560 Ω 6 0.47 µF 5 + VCO 150 Ω 4 0.01 µF 3 100 µF 2 2 kΩ 1 EQ AMP 15 µH 330 Ω 2.2 kΩ MIX HPF VCC GND VIDEO OUT T00044 No. 6100-9/18 LA7565E, 7565KM Pin Functions Pin No. 1 Pin SIF INPUT 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 kΩ 1 kΩ A12052 24 kΩ 4.2V 4 kΩ FM power supply filter C1 TO VCO BIAS 14 kΩ 2 2 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. 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. 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-Ω 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-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. 3 200 Ω 500 kHz 68 Ω 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 VCC Pin function Equivalent circuit V CC and ground should be decoupled with as small a separation as possible. 6 7 8 EQ amp EQ OUTPUT 9.2 kΩ 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. 6 1 kΩ 2 kΩ 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 × G Where, G: Gain of the voltage follower amplifier vin: Imaginary short G: About 2.3 dB Assuming vin ≈ 0: 7 C L =Z R A12056 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 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. FROM APC DET A 1 kΩ 1 kΩ 1 kΩ We recommend values of: R = between 150 and 390 Ω, and C = 0.47 µF for this APC filter. 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 kΩ Composite video output 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 Ω 10 15 pF 2 pF 10 A12059 11 11 12 VCO tank 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. 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 kΩ. This circuit includes a control function that naturally brings the AFT voltage to its center value under weak field reception conditions. 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. to tuner 14 100 Ω 60 kΩ RF AGC output 20 kΩ 14 A12062 Continued on next page. No. 6100-12/18 LA7565E, 7565KM Continued from preceding page. Pin No. 15 Pin First SIF input Pin function 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. Equivalent circuit 2 kΩ 2 kΩ 15 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 µF 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 kΩ A12063 1 kΩ INTER/SPLIT SW LO=INTER 16 17 IF AGC filter 1 kΩ 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. 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 18 19 VIF input 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 C ≈ 3 pF 19 A12066 20 GND 560 Ω 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 be muted at the same time by shorting this pin to ground. 20 kΩ 21 20 kΩ 4.2V 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 22 First SIF output 20 kΩ 620 Ω 22 6 kΩ Construct a chrominance carrier trap here. A12068 22 Continued on next page. No. 6100-14/18 LA7565E, 7565KM Continued from preceding page. Pin No. 23 Pin FM filter 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. 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 kΩ 1 kΩ 23 R C + A12069 FM detector output R2 R1 24 300 Ω 10 kΩ 24 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 C • In applications that support mono: Attach an external de-emphasis circuit with the following time constant. t = CR2 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 ■ ■ ······ 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 reduced Frequency The high band is extended 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 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 A12073 A12072 SAW filter (SPLIT) A12074 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 Picture TSF1241 Picture TSF5315 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