Ordering number : EN5765 Monolithic Linear IC LA7567N, 7567NM TV and VCR VIF/SIF IF Signal-Processing Circuit with PAL/NTSC Multi-Format Audio Support Overview The LA7567N and LA7567NM are PAL/NTSC multiformat audio VIF/SIF IF ICs that adopt a semiadjustment-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 to support multi-format audio detection. A built-in SIF converter is included to simplify multi-format system designs. A 5-V power-supply voltage is used to match that used in most multimedia systems. In addition, these ICs also include a buzz canceller to suppress Nyquist buzz and provide high audio quality. Package Dimensions unit: mm 3067-DIP24S [LA7567N] Functions [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 SANYO: DIP24S unit: mm 3112-MFP24S [LA7567NM] Features • Both AFT and SIF inductors built in, thus making adjustment of external inductance unnecessary. • A PAL/NTSC multi-format audio system can be constructed easily. • Built-in buzz canceller for excellent audio performance. • VCC = 5 V, low power dissipation (250 mW) Specifications SANYO: MFP24S 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 420 720 500 mW mW mW Pd max TA ≤ 50°C, Independent IC [LA7567NM] *: Mounted on a printed circuit board TA ≤ 70°C, Independent IC [LA7567N] 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. SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 50698RM (OT) No. 5765-1/14 LA7567N, 7567NM 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 Operating Characteristics at Ta = 25°C, VCC = 5 V, fp = 38.9 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 40.8 48.0 VCC – 0.5 VCC 33 55.2 V 0 0.5 V 39 45 dBµV GR 58 63 dB VIN max 95 100 dBµV V6 3.0 3.3 3.6 V6 tip 1.15 1.45 1.74 V VO 1.36 1.60 1.84 Vp-p V Black noise threshold voltage VBTH 0.5 0.8 1.1 Black noise clamp voltage VBCL 1.6 1.9 2.2 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 AFT detection sensitivity Sf 20 28 37 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) 0.7 fPL kΩ pF 1.5 MHz –1.5 –0.9 AFT tolerance frequency 1 dfa1 –300 0 +300 VCO1 maximum variability range (U) dfu 1.0 1.5 VCO1 maximum variability range (L) dfl VCO control sensitivity B 1.4 V mV/kHz MHz kHz MHz –1.5 –1.0 MHz 2.8 6.0 kHz/mV [First SIF Block] Conversion gain VG 22 28 32 dB 5.5 MHz output level SO 32 70 110 mVrms 50 100 First SIF maximum input SIN max First SIF input resistance RIN (SIF) 33.4 MHz 2 kΩ First SIF input capacitance CIN (SIF) 33.4 MHz 3 pF mVrms [SIF Block] Limiting sensitivity Vli (lim) FM detector output voltage VO (FM) AMR rejection ratio AMR Total harmonic distortion THD SIF S/N S/N (FM) 5.5 MHz ±30 kHz * 42 48 54 dBµV 480 680 880 mVrms 50 60 0.3 57 dB 0.8 % 62 [SIF Converter] Conversion gain Maximum output level Carrier suppression ratio Oscillator level Oscillator leakage Oscillator stopped current VG (SIF) V max 8 11 14 dB 103 109 115 dBµV VGR (5.5) 15 21 dB VOSC 35 70 mVp-p OSCleak 14 25 I4 dB 300 µA Note: *Insert a resistor and capacitor in series between pin 23 and ground to adjust the level to acquire a wide dynamic range in the FM detector output. No. 5765-2/14 LA7567N, 7567NM Allowable power dissipation, Pd max — W Pin Assignment Ambient temperature, Ta — °C Internal Equivalent Circuit and External Components No. 5765-3/14 LA7567N, 7567NM AC Characteristics Test Circuit Test Circuit Impedance analyzer No. 5765-4/14 LA7567N, 7567NM Application Circuit Diagrams PAL SPLIT NT (US) SPLIT No. 5765-5/14 LA7567N, 7567NM JAPAN SPLIT NT (US) INTER No. 5765-6/14 LA7567N, 7567NM 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. No. 5765-7/14 LA7567N, 7567NM Pin Descriptions Pin No. Pin Description SIF INPUT • 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. 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. 3 4 SIF converter • Pin 3 is the SIF converter output. The signal is passed through a 6-MHz bandpass filter and input to the SIF circuit. There is a 200-Ω resistor in series with the emitterfollower output. • Pin 4 is the SIF converter 500-kHz oscillator connection. Since this oscillator circuit includes an ALC, the oscillator level is held fixed at a low level. If this circuit is not used, connect pin 4 to ground through a 10-kΩ external resistor. Providing this external resistor stops the 500-kHz oscillator and allows the converter to be used as an amplifier. 5 VCC 1 2 Equivalent circuit • Use the shortest distance possible when decoupling VCC and ground. Continued on next page. No. 5765-8/14 LA7567N, 7567NM Continued from preceding page. Pin No. Pin Description Equivalent circuit • Equalizer circuit. This circuit is used to correct the video signal frequency characteristics. Pin 17 is the EQ amplifier input. This amplifier amplifies a 1.5-V p-p video signal to 2-V p-p. • Notes on equalizer amplifier design The equalizer amplifier is designed as a voltage follower amplifier with a gain of about 2.3 dB. When used for frequency characteristics correction, a capacitor, inductor, and resistor must be connected in series between pin 7 and ground. • Approach used in the equalizer amplifier If vi is the input signal and vo is the output signal, then: 6 7 8 EQ amp R1 —— +1 (vi + vin) = Vo × G 2 Where G is the voltage-follower amplifier gain. Assume: vin: Imaginary short G: About 2.3 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. 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. For this APC filter we recommend: R = 150 to 390 Ω C = 0.47 µF Continued on next page. No. 5765-9/14 LA7567N, 7567NM Continued from preceding page. Pin No. Pin Description 10 Composite video output • 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 ≥ 300 Ω 11 12 VCO tank • 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. 13 14 15 AFT OUTPUT RF AGC OUTPUT 1st SIF INPUT Equivalent circuit • 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. • 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. • 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. • When used in an intercarrier system: This pin (pin 15) may be left open. Continued on next page. No. 5765-10/14 LA7567N, 7567NM Continued from preceding page. Pin No. Pin Description 1st SIF AGC FILTER • 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. 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. 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 20 GND 16 17 Equivalent circuit Continued on next page. No. 5765-11/14 LA7567N, 7567NM Continued from preceding page. Pin No. 21 Pin RF AGC VR Description Equivalent circuit • 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. • 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 NICAM output Forms a chrominance killer trap. 23 24 FM filter FM Detector output • 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. • 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 No. 5765-12/14 LA7567N, 7567NM 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 ■ ■ ... Japan TSF11■ 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 With the Tuning Set to the IF frequency Coil Specifications Frequency With the Tuning Set to the Vicinity of S and C JAPAN f = 58.75 MHz US f = 45.75 MHz PAL f = 38.9 MHz Test production no. 16991B Tokyo Parts Industrial Co., Ltd. Test production no. 16687B Tokyo Parts Industrial Co., Ltd. Test production no. 16686B Tokyo Parts Industrial Co., Ltd. Picture TSF1137U Sound Picture TSF1241 Sound Picture TSF5315 Sound TSF5220 TSF5221 TSF5321 TSF5344 VCO coil SAW filter (SPLIT) SAW filter (INTER) Tokyo Parts Industrial Co., Ltd. TEL: +81-270-23-3731 236 Hinode Machi, Isezaki Shi, Gunma Prefecture, Japan No. 5765-13/14 LA7567N, 7567NM 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. ■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. ■ Anyone purchasing any products described or contained herein for an above-mentioned use shall: ➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: ➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. ■ 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, 1998. Specifications and information herein are subject to change without notice. PS No. 5765-14/14