Ordering number : ENN6276B Monolithic Linear IC LA75675M-S VIF/SIF IF Signal-Processing Circuit that Supports NTSC Intercarrier for TV and VCR Products Overview Features The LA75675M-S is an NTSC intercarrier VIF/SIF IC that adopts a semi-adjustment-free structure. In particular, it uses VCO adjustment to make AFT adjustment unnecessary and thus simplifies the overall adjustment process. A PLL-based technique is adopted for FM detection. The 5 V supply voltage provides compatibility with other multimedia systems. In addition it achieves high audio quality by incorporating a built-in buzz canceller that suppresses Nyquist buzz. • No AFT or SIF coils are used, thus eliminating adjustments. • Excellent audio performance due to the built-in buzz canceller. • VCC = 5 V and a low power dissipation of 250 mW. Package Dimensions unit: mm 3112A-MFP24S Functions [LA75675M-S] 720 0.15 1.5 700 7.6 5.4 12 12.5 0.1 Allowable power dissipation, Pdmax — W 1 When mounted on a 65 × 72 × 1.6 mm3 paper-phenol printed circuit board 0.63 Pd max - Ta 800 13 24 1.7max [VIF] • VIF amplifier • PLL detector • BNC • RF AGC • EQ amplifier • AFT • IF AGC • Buzz canceller [SIF] • Limiter amplifier • PLL FM detector 600 0.35 1.0 500 SANYO: MFP24S Independent IC 420 (0.75) 400 300 200 100 0 -20 0 20 40 60 70 80 100 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 Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 51500RM (OT) No. 6276-1/13 LA75675M-S Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCC max 6 V Circuit voltage V13, V17 VCC V I6 –3 Circuit current I10 –10 mA I24 –2 mA Allowable power dissipation Pd max mA Ta ≤ 50°C, independent IC 420 mW *: Mounted on a PCB. 720 mW Operating temperature Topr –20 to +70 °C Storage temperature Tstg –55 to +150 °C Ratings Unit *: A 65 × 72 × 1.6 mm3 paper-phenol printed circuit board Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Operating voltage range Symbol Conditions VCC VCCop 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 video output voltage VIN S1 = OFF 32 40 VCC – 0.5 VCC 32 48 mA V 0 0.5 V 38 44 dBµV GR 58 63 dB VINmax 95 100 dBµV V6 3.5 3.8 4.1 V6 tip 0.9 1.2 1.5 V 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 1.6 1.9 2.2 Video signal-to-noise ratio S/N 48 52 C-S beating IC-S Sync signal tip voltage Video output level 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 % deg No-signal AFT voltage 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 28 40 52 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) AFT tolerance frequency 1 1.3 f dfa 1 VCO 1 maximum variability range (U) dfu VCO 1 maximum variability range (L) dfl VCO control sensitivity B kΩ pF 2.0 MHz –2.0 –1.4 –150 0 +150 1.5 2.0 1.3 V mV/kHz MHz kHz MHz –2.0 –1.5 MHz 2.7 5.4 kHz/mV Continued on next page. No. 6276-2/13 LA75675M-S Continued from preceding page. Parameter Symbol Ratings Conditions min typ max Unit [SIF Block] Limiting sensitivity Vli (lim) FM detection output voltage VO (FM) AMR rejection ratio AMR Total harmonic distortion THD SIF signal-to-noise ratio S/N (FM) 4.5 MHz output level Vsout 4.5 MHz ± 25 kHz *1 39 45 51 dBµV 400 520 660 mVrms 50 60 0.3 SIF IN 80 dBµV 59 64 82 89 dB 0.8 % dB 96 dBµV Note: 1. The FM detection output level can be reduced and the FM dynamic range improved by inserting the resistor R in series with the capacitor between pin 23 and ground. Pin Arrangement SIF INPUT 1 24 FM DET OUT BIAS FILTER 2 23 FM FILTER SIF OUT 3 22 BPF-OUT NC 4 21 RF AGC VR VCC 5 20 GND VIDEO OUT 6 19 VIF INPUT EQ FILTER 7 18 VIF INPUT EQ INPUT 8 17 1st AGC FILTER APC FILTER 9 16 2nd AGC FILTER VIDEO DET OUT 10 15 2nd AGC FILTER LA75675M-S VCO COIL 11 14 RF AGC OUT VCO COIL 12 13 AFT OUT Top view A12615 No. 6276-3/13 LA75675M-S Internal Equivalent Circuit and External Circuits RFAGC VR 19 16 15 1 kΩ 2 kΩ 14 4.7 kΩ 500 Ω 10 kΩ 0.01 µF 13 V 10 kΩ 1 kΩ 1 kΩ 0.01 µF 330 pF 0.01 µF 0.015 µF 17 V 1 kΩ 300 Ω 18 AFT OUTPUT 120 kΩ 120 kΩ 1 kΩ 20 30 kΩ 21 6.8 kΩ 22 100 Ω 23 1 kΩ SAW(P) 10 kΩ-B + 24 0.01 µF 1 µF 0.01 µF AUDIO OUT PUT 7.5 kΩ IF IN PUT RF AGC OUT PUT 5 6 2.2 kΩ + 0.01 µF 330 Ω 8 9 10 11 12 + 1 µF BPF 4.5 MHz 7 200 Ω 9.2 kΩ 4 150 Ω 3 0.47 µF 2 1 kΩ 2.2 kΩ 1V 1.2 kΩ V 1 µF 1 V 10 kΩ 4 kΩ 200 Ω 1 kΩ 1.2 kΩ 1 kΩ1 kΩ 330 Ω R VCO COIL VCC GND VIDEO OUT A12616 Note: Resistor R must have a value of 470 Ω or larger. No. 6276-4/13 LA75675M-S AC Characteristics Test Circuit VIF IN 51 Ω 24 23 22 21 20 19 18 17 16 0.01 µF 1000 pF 330 pF 0.01 µF GND 0.01 µF 1 µF + 0.01 µF 0.01 µF 7.5 kΩ (M) 0.01 µF FM DET OUT (D) 15 14 13 FM DET VIF AMP IF AGC VIDEO DET 6 dB AFT OUT (B) V 120 kΩ 120 kΩ 6.8 kΩ RF AGC RF AGC OUT (F) IF AGC 10 kΩ-B RF AGC VR 0.015 µF (M) 4.5 MHz (E) AFT HPF LIM AMP VCO 2nd SIF IN 7 8 VIDEO OUT (A) SIF.OUT 9 + 10 330 Ω 11 12 24 pF 560 Ω + 6 150 Ω 5 + S1 100 kΩ 1.5 kΩ 4 0.01 µF 3 1 µF 51 Ω 2 0.01 µF 1 0.47 µF EQ AMP VCC GND A12617 Test Circuit Impedance analyzer 24 23 22 21 20 19 18 0.01 µF 0.01 µF 0.01 µF 0.01 µF 0.01 µF 0.01 µF 0.01 µF 10 kΩ 0.01 µF 0.01 µF 0.01 µF VIF IN 17 16 15 14 13 8 9 10 11 12 LA75675M-S 5 6 7 330 Ω 4 + 100 µF 3 0.01 µF 2 0.01 µF 1 VCC A12618 No. 6276-5/13 LA75675M-S Sample Application Circuit NTSC IN PUT 22 21 20 19 18 17 16 15 1000 pF 330 pF 0.01 µF 0.01 µF (M) GND 14 13 VCC VCC 30 kΩ FM DET RF AGC VIF AMP IF AGC AFT OUT 120 kΩ 120 kΩ 23 SAW(P) 6.8 kΩ 24 RF AGC OUT 0.015 µF (M) + 1000 pF 0-10 kΩ 1µF 7.5 kΩ 0.01 µF (M) AFT LIM AMP VIDEO DET 6 dB HPF EQ AMP + 6 7 8 9 + 15 µH 10 11 12 330 Ω 2.2 kΩ 5 4 560 Ω 1 µF 3 VCO 0.47 µF 2 + BPF 4.5 MHz 330 Ω 0.01 µF 1 1 µF AF OUT 50 kΩ-VR 4.5 MHz OUT VCC GND VIDEO OUT A12619 No. 6276-6/13 LA75675M-S Pin Functions Pin No. Pin Function Equivalent circuit 1 kΩ SIF input The input impedance is about 1 kΩ. 1 SIF input 1 Since interference signals* entering this input can result in buzzing and beat signals, the pattern layout for the signal input to this pin must be designed carefully. 1 kΩ *: Signals that can interfere with audio include video and chrominance signals. Thus the VIF carrier signal can cause interference. 1 kΩ A12620 4.2 V 10 kΩ 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 2 C1 4 kΩ C1 must be 0.47 µF or higher, and we recommend 1 µF. If the FM detector is not used, a 2 kΩ resistor must be inserted between pin 2 and ground. This stops the FM detector VCO circuit. TO VCO BIAS 14 kΩ A12621 3 SIF out Outputs the intercarrier detector output that has been passed through a high-pass filter. 200 Ω 3 (4.5 MHz output) A12622 4 NC This pin should be left open. 5 VCC Use lines that are as short as possible for VCC/ground decoupling. Continued on next page. No. 6276-7/13 LA75675M-S Continued from preceding page. Pin No. Pin Function Equivalent circuit 40 kΩ Equalizer circuit EQ OUTPUT 9.2 kΩ Pin 8 is the input to the EQ amplifier. The EQ amplifier takes a 1.5 Vp-p video signal as its input and amplifies that to a 2.0 Vp-p level. 6 1 kΩ 2.2 kΩ This circuit corrects the frequency characteristics of the video signal. • Notes on the equalizer amplifier design The equalizer amplifier is designed as a voltage follower amplifier with a gain of about 2.3 dB. If frequency characteristics correction is required, insert the capacitor, inductor, and resistor between pin 7 and ground in series. C • Using the equalizer amplifier 6 7 7 EQ amp R1 —— +1 Z 8 L =Z If the input signal is vi and the output signal vo, then R (Vi + Vin) = Vo × G A12623 G: Gain of the voltage follower amplifier Vin: Imaginary voltage G: About 2.3 dB Assuming Vin ≈ 0, then AV will be: VoG R1 AV = —— = —— + 1 Vi Z R1 is an IC internal 1 kΩ resistor. Simply select a value of Z according to the desired characteristics. However, note that the equalizer amplifier gain will be a maximum at the Z resonance, so care is required to prevent distortion from occurring. EQ INPUT 8 200 Ω AGC A12624 FROM APC DET PLL detector APC filter connection 9 APC filter The APC time constant is switched internally by the IC. When locked, the VCO is controlled by the route A, and the gain is reduced. When unlocked or during weak field reception, the VCO is controlled by the route B, and the gain is increased. A 1 kΩ 1 kΩ 1 kΩ We recommend the following values for this APC filter: B R = 150 to 390 Ω C = 0.47 µF. 9 R C + A12625 Continued on next page. No. 6276-8/13 LA75675M-S Continued from preceding page. Pin No. Pin Function Equivalent circuit 2 kΩ 10 Composit video output Outputs a video signal that includes the SIF carrier. A resistor must be inserted between pin 10 and ground to acquire adequate drive capability. 10 15 pF 1.5 pF R ≥ 470 Ω 300 Ω A12626 11 12 VCO tank circuit for video detection 11 12 VCO tank See the separately provided coil specifications for details on the tank circuit. This VCO is a vector synthesis VCO circuit. A12627 120 kΩ AFT output 13 AFT output This circuit includes a function that controls the AFT voltage so that it naturally goes to the center voltage during weak field reception. 1 kΩ A 120 kΩ bleeder resistor is built in. Note that the sensitivity can be lowered by attaching an external resistor. 13 120 kΩ RF AGC output 14 RF AGC output This output controls the tuner RF AGC. The internal circuit includes both a 30 kΩ pull-up resistor and a 100 Ω protective resistor. Determine the value of the external bleeder resistor to match the specifications of the tuner. To tuner 14 100 Ω 30 kΩ A12628 A12629 Continued on next page. No. 6276-9/13 LA75675M-S Continued from preceding page. Pin No. Pin Function Equivalent circuit 16 AGC filter 17 27 kΩ 17 The AGC voltage is created by smoothing the signal that results from peak detection by the AGC detector at pins 17 (first AGC), and 15 and 16 (second AGC). The video signal input to this IF AGC detector is a signal that was passed through the audio trap circuit. 1 kΩ 16 6.8 kΩ 35 kΩ IF AGC filter connection 15 2 kΩ 15 A12630 18 VIF amplifier input 18 19 VIF input The input circuit is a balanced input, and its input impedance is due to the following component values. 19 R ≈ 1.5 kΩ C ≈ 3 pF A12631 20 GND Continued on next page. No. 6276-10/13 LA75675M-S Continued from preceding page. Pin No. Pin Function Equivalent circuit 4.2 V RF AGC adjustment 21 RF AGC VR 20 kΩ This pin sets the tuner's RF AGC operating point. Both the FM output and the video output can be muted by setting this pin to the ground level. 560 Ω 20 kΩ 21 A12632 200 Ω Bandpass filter output 22 BPF-out 22 The output to the external bandpass filter is passed through an internal 6 dB amplifier before being output. A12633 Filter that holds the FM detector output DC voltage fixed. 23 FM filter Normally, a 1 µF electrolytic capacitor is used. If the low band (around 50 Hz) frequency characteristics are of concern, this value should be increased. The FM detection output level can be reduced and the FM dynamic range improved by inserting the resistor R in series with the capacitor between pin 23 and ground. 1 kΩ 1 kΩ 23 R C + A12634 24 FM detector output Audio FM detector output This is an emitter-follower circuit with a 300 Ω resistor inserted in series. • Stereo applications In some application that provide input to a stereo decoder, the input impedance may be reduced, resulting in distortion in the L-R signal and degraded stereo characteristics. If this problem occurs, add a resistor between pin 24 and ground. R1 ≥ 5.1 kΩ • Mono applications Construct an external deemphasis circuit. t = CR2 R2 C R1 24 300 Ω 10 kΩ A12635 No. 6276-11/13 LA75675M-S Notes on Sanyo SAW Filters There are two types of SAW filters, which differ in the piezoelectric substrate material used, 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 low 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. • With the tuning set to the IF frequency • With the tuning set to the vicinity of S and C SAW filter characteristics The high band response is reduced The high band is extended Frequency Frequency A12636 Coil Specifications JAPAN f = 58.75 MHz VCO coil S t=5t 0.12 ø C = 24 pF US f = 45.75 MHz S t=6t 0.12 ø C = 24 pF A12637 SAW filter (SPLIT) SAW filter (INTER) PAL f = 38.9 MHz S A12638 t=7t 0.12 ø C = 24 pF A12639 Prototype no. V291XCS-3220Z Prototype no. 291XCS-3188Z Prototype no. 292GCS-7538Z The Toko Electric Corporation The Toko Electric Corporation The Toko Electric Corporation Picture TSF1137U Sound Picture TSF1241 Sound Picture TSF5315 Sound TSF5220, TSF5221 TSF5321, TSF5344 The Toko Electric Corporation 2-1-17 Higashi Yukigaya Ota-ku, Tokyo Telephone: +81-3-3727-1167 No. 6276-12/13 LA75675M-S Notes on VCO Transformer Circuits • Built-in capacitor VCO transformer circuits When power is first applied, the heat generated by the IC is transmitted through the printed circuit board to the VCO transformer. However, the VCO coil frame functions as a heat sink and dissipates the heat from the IC. As a result, it is relatively difficult to transmit heat to the VCO transformer's built-in capacitor, and drift at power on is minimal. 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 transformer circuits When an external capacitor is used, the 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 power is applied, 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 May, 2000. Specifications and information herein are subject to change without notice. PS No. 6276-13/13