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| Ordering number : EN5734 Monolithic Linear IC LA75691 IF Signal-Processing IC for PAL/NTSC Multichannel Audio TV and VCR Systems Overview The LA75691 is a PAL/NTSC multichannel audio VIF/SIF signal-processing IC that makes the minimum number of adjustments possible. The system is designed so that VCO adjustment makes AFT adjustment unnecessary, thus simplifying the adjustment steps in endproduct manufacturing. PLL detection is adopted in the FM detector, allowing the LA75691 to support multichannel detection for the audio signal. In addition, it also incorporates a buzz canceller that suppresses Nyquist buzz for improved audio quality. Package Dimensions unit: mm 3067-DIP24S [LA75691] Functions [VIF Block] * PLL detector with minimum number of adjustments * AFT * Equalizer amplifier * RF AGC [First SIF BLOCK] * First SIF detector * HPF [SIF Block] * PLL-based FM detector [Muting Block] * AV muting SANYO: DIP24S Features * Excellent buzz and buzz/beating characteristics provided by a PLL detection technique that includes a buzz canceller. * The second IF AGC filter is built in. * No coils are used in the AFT and SIF circuits, making them adjustment free. Allowable power dissipation, Pd max -- W Ambient temperature, Ta -- C 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 Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 90898RM (OT) No. 5734-1/13 LA75691 Specifications Maximum Ratings at Ta = 25C Parameter Maximum supply voltage Circuit voltage Symbol VCC max V13, V17 I6 Circuit current I10 I24 Allowable power dissipation Operating temperature Storage temperature Pd max Topr Tstg Ta 68C Conditions Ratings 13.2 VCC -3 -10 -2 720 -20 to +70 -55 to +150 Unit V V mA mA mA mW C C Note: When mounted on a 65 x 72 x 1.6 mm laminated paper phenolic resin printed circuit board. Operating Conditions Parameter Recommended supply voltage Operating supply voltage range Symbol VCC VCC op Conditions Ratings 9 8.5 to 12.5 Unit V V Operating 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 signal-to-noise ratio C-S beating Frequency characteristics Differential gain Differential phase 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 frequency tolerances 1 VCO1 maximum variability range (U) VCO1 maximum variability range (L) VCO control sensitivity 5.5 MHZ output level [SIF Block] Limiting voltage FM detector output voltage AM rejection ratio Total harmonic distortion SIF signal-to-noise ratio Vi (lim) VO (FM) AMR THD S/N (FM) 57 5.5 MHz 30 kHz 5.5 MHz 30 kHz AM = 30 % 43 720 50 48 900 60 0.3 62 0.8 53 1100 dBV mVrms dB % dB I5 V14H V14L VIN GR VIN max V6 V6 tip VO VBTH VBCL S/N IC-S fC DG DP V13H V13L Sf Ri Ci fPU fPL dfa 1 dfu dfl B SO P/S = 14 dB 1.4 92 -300 1.0 38.9 MHz 38.9 MHz 0.8 8.5 0 22.4 6 MHz S1 = Off 24 62 92 3.5 1.15 1.7 0.5 2.5 48 38 -3.0 35.5 7.5 42.0 8.1 0 30 68 97 3.8 1.45 2.0 0.8 2.8 50 43 -1.5 3.0 3 8.7 0.18 28.0 1.5 3 1.3 -1.5 0 1.3 -1.5 2.8 95 -1.0 5.6 98 -0.8 +300 6.5 5 9.0 0.5 33.6 4.2 1.74 2.3 1.1 3.1 0.5 36 48.5 V V V dBV dB dBV V V Vp-p V V dB dB dB % deg V V mV/kHz k pF MHz MHz kHz MHz MHz kHz/mV mVrms Symbol Conditions Ratings min typ max Unit No. 5734-2/13 LA75691 Pin Assignment Internal Equivalent Circuit and External Circuits No. 5734-3/13 LA75691 AC Characteristics Test Circuit Test Circuit Impedance analyzer No. 5734-4/13 LA75691 NT (US) INTER No. 5734-5/13 LA75691 Sample Application Circuit If the SIF, AFT, and RF AGC circuits are not used: * If the SIF circuit is not used: Pins 1, 23, and 24 should be left open. Insert a 2-k resistor between pin 2 and ground. * If 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. * If the RF AGC circuit is not used: Pins 14 and 21 should be left open. Insert a 0.01-F capacitor between pin 21 and ground to prevent oscillation. No. 5734-6/13 LA75691 Pin Descriptions Pin No. Pin Function Equivalent circuit SIF input The input impedance is about 1 k. The pattern layout for the input circuit for this pin must be designed carefully, since buzzing and/or beating can be caused by interference signals. Video signals, the chrominance signal, and the VIF carrier signal can cause interference in the audio signal. 1 SIF INPUT The FM detector signal-to-noise ratio can be improved by inserting a filter in the FM detector bias line. 2 FM power supply filter C1 must be at least 0.47 F, and 1 F is recommended. If the FM detector is not used, insert a 2-k resistor between pin 2 and ground. This stops the FM detector VCO. Pin 3 is the first SIF output. 3 First SIF output This is the output pin for the audio carrier to which P/S separate detection has been applied. This is an emitterfollower output with a 200 series resistor inserted. Continued on next page. No. 5734-7/13 LA75691 Continued from preceding page. Pin No. 5 Pin VCC Function The VCC to ground decoupling capacitors must be placed as close to the IC as possible. Equivalent circuit Equalizer circuit. This circuit corrects the frequency characteristics of the video signal. Pin 17 is the equalizer amplifier input. A 1.5-V p-p signal is input to pin 17, and that signal is amplified to be a 2-V p-p signal by the equalizer amplifier. Equalizer amplifier design: The equalizer amplifier is designed as a voltage-follower amplifier with a gain of about 2.3 dB. Connect an inductor, a capacitor, and a resistor in series between pin 7 and ground if the frequency characteristics require correction. Notes on the equalizer amplifier: If the input signal is vi and the output signal is vo, then: 6 7 8 G: The voltage-follower amplifier gain. vin: Imaginary short G: About 2.3 dB Assuming that vin is 0, then: EQ amp R1 ---- +1 (vi + vin) = Vo x G Z VoG R1 AV = ------ = ---- +1 Vi Z R1 is the IC internal resistance of 1 k. Simply select Z to match the desired characteristics. However, note that Z must be chosen carefully in order not to cause distortion, since the equalizer amplifier gain will be maximum at the resonance determined by Z. PLL detector APC filter The APC time constant is switched internally in the IC. When locked, the VCO is controlled by loop A, and the gain is reduced. When unlocked and in weak field reception, the VCO is controlled by loop B, and the gain is increased. 9 APC FILTER For this APC filter the recommended values are: R should be between 150 and 390 . C should be 0.47 F. Continued on next page. No. 5734-8/13 LA75691 Continued from preceding page. Pin No. Pin Function Equivalent circuit Output for the video signal that includes the SIF carrier 10 Conposite video output A resistor must be inserted between pin 10 and ground to assure adequate drive capabilities. R 300 11 12 VCO tank Connections for the VCO tank circuit used by the video detector. See the coil specifications for the tank circuit provided separately. This VCO is a vector synthesis VCO. AFT output The AFT center voltage is created by an external bleeder resistor. The AFT gain increases as the value of this bleeder resistor increases. This resistor must not exceed 390 k. This circuit includes a function that controls the AFT voltage to naturally approach the center voltage during weak field reception. 13 AFT OUTPUT RF AGC output This signal controls the tuner RF AGC. 14 RF AGC OUTPUT This is an emitter output with a 200 protective resistor inserted in series. Determine the value of the external bleeder resistor according to the specifications of the tuner. 15 16 NC NC Continued on next page. No. 5734-9/13 LA75691 Continued from preceding page. Pin No. Pin Function Equivalent circuit IF AGC filter connection The AGC voltage is created at pin 17 from the peak detection output produced by the internal AGC detector. A second AGC filter (a lag-lead filter) is built in the IC to create a dual time constant. Use a 0.022-F capacitor as the external capacitor. Adjust the value of the capacitor to compensate for sag, or modify the AGC speed as required. 17 IF AGC FILTER VIF amplifier input 18 19 VIF input The input circuit is a balanced input and the input impedance corresponds to: R 1.5 k and C 3 pF. 20 GND RF AGC trimmer connection 21 RF AGC VR This pin is used to set the tuner RF AGC operating point. The FM and video outputs can be muted at the same time by shorting this pin to ground. 22 NC Continued on next page. No. 5734-10/13 LA75691 Continued from preceding page. Pin No. Pin Function Equivalent circuit This filter is used to hold the FM detector output DC voltage fixed. 23 FM filter Normally, a 1-F electrolytic capacitor should be used. The value of this capacitor can be increased to improve the low band (around 50 Hz) frequency characteristics. Audio FM detector output This is an emitter follower output with a 200- resistor inserted in series. * Stereo applications Some applications may find that the stereo decoder input has a low input impedance, and that the left and right signals are distorted, i.e. that the stereo characteristics are degraded. If that is a problem, add the resistor R1 shown in the figure between pin 24 and ground. R1 5.1 k * Mono applications Use an external deemphasis circuit with the following time constant: t = 2RC 24 FM Detector output No. 5734-11/13 LA75691 Notes on Sanyo SAW Filters There are two types of SAW filter that differ in the piezoelectric substrate material used. * Lithium-tantalum (LiTaO3) SAW filters TSF11s s ... Japan s TSF12s s ... US s 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 TSF52s s ... US s TSF53s s ... PAL s 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 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 frequency response is reduced The high-band frequency response is extended Frequency When tuned to the IF frequency Frequency When tuned near S or C No. 5734-12/13 LA75691 Coil Specifications JAPAN f = 58.75 MHz VCO coils US f = 45.75 MHz PAL f = 38.9 MHz Test production no. 16991B Tokyo Parts Industrial Co., Ltd. SAW filters (split) Picture TSF1137U Sound SAW filters (inter) Test production no. 16687B Tokyo Parts Industrial Co., Ltd. Picture TSF1241 Sound TSF5220 TSF5221 Test production no. 16686B Tokyo Parts Industrial Co., Ltd. Picture TSF5315 Sound TSF5321 TSF5344 Notes on VCO Tank Circuits * Built-in capacitor VCO tank circuits When power is applied to the IC, 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, this heat is not transmitted readily to the VCO tank circuit's built-in capacitor, and 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 influenced as much by this heat, and as a result the power-on drift is larger. Accordingly, a coil whose core material has low temperature coefficient characteristics must be used. It is also desirable to use a capacitor with similarly low temperature coefficient characteristics. Note: Applications that use an external capacitor here must use a chip capacitor. If an ordinary capacitor is used, problems such as the oscillator frequency changing with the capacitor orientation may occur. 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 June, 1998. Specifications and information herein are subject to change without notice. PS No. 5734-13/13 |
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