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LA3410 датащи(PDF) 8 Page - Sanyo Semicon Device |
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LA3410 датащи(HTML) 8 Page - Sanyo Semicon Device |
8 / 13 page LA3410 No.1407–8/13 6. Separation adjust The separatin is adjusted by varying the main signal level in the composite signal. The main signal is applied to the post amplifier input through amplifiers A1, A3. The input level in A3 is varied by internal resistor RA and external variable resistor VR1. Therefore, the output main signal becomes 0 at VR1=0 and is maximized at VR1= ∞. The separation is presettable if VR1 is set to an adequate value. In this case, the VR1 value differs with each set ; X of VR1 is approxmately 150k Ω when the ratio of the main signal and sub signal at the LA3410 input is 1 : 1 and the sub signal and pilot signal are in phase. The separation, when preset, varies 30dB min. with the variations in the IC only considered. If the value of capacitor C8 for DC cut is decreased, the separation gets worse at low frequencies. 7. Post amplifier oscillation when loaded capacitively (inductively) If the post amplifier outputs (pins 4, 7) are loaded capacitively (inductively), oscillation may occur. When connecting a low-pass filter to each of the outputs, an input resistor must be connected across the post amplifier output and the low- pass filter and the wiring across these points must be made as short as possible. 8. Forced monaural mode The following method is used to provide the forced monaural mode. In this case, VCO oscillation does not stop. The above-mentioned VCO stop method is used to stop VCO oscillation. · Connect pin 10 to GND through a resistor of 10k Ω. Other application circuit 1. How to improve the dynamic range of the post amplifier The amplifier bias voltage is set low (3.0V) so that the LA3410 is capable of being operated from low voltage. If the supply voltage is high, the following method can be used to extend the dynamic range. Fig. 6 shows how to extend the dynamic range of the post amplifier. When RB is not used, the DC voltage across pins 4 and 7 is 3.0V. The DC volatage across pins 4 and 7 can be increased to extend the dynamic range of the post amplifier. Pins 5, 6, being minus input pins of the post amplifier, are virtual GND points. By connecting RB across pin 5 and GND and across pin 6 and GND, the DC voltages on pins 4, 7 are obtained as follows : The upper and lower loss voltages of the post amplifier are approximately 2V and 0.5V respectively. With these loss voltages considered, the voltages on pins 4, 7 are set. For example, Figs. 11, 12 show how the dynamic range is improved when the DC voltages on pins 4, 7 are set to approximately 5.2V with upper loss voltage 2V and lower loss voltage 0.5V of the post amplifier considered. Fig. 11 shows the characteristic where no RB is con- nected ; Fig. 12 shows the characteristic where RB=82kΩ is connected. 2. Feedback resistance of post amplifier and total gain Table 2 shows the feedback resistance of the post amplifier and the total gain. Fig. 13 shows the distortion vs. feedback resistance characteristic. Figs. 14, 15 show the sample application circuits where R1 (R2) is 100k Ω and 130kΩ respec- tively. Table 2. R1 (R2), C3 (C4) – gain 3.0 =3.0 (1+ ) RB+R1 RB R1 RB 3.0 =3.0 (1+ ) RB+R2 RB R2 RB k ) 2 R ( 1 R Ω F p ) 4 C ( 3 C] B d [ n i a g l a t o T] V m [ p y t e g a t l o v l a n g i s t u p t u O 2 60 5 75 . 80 3 7 2 80 2 61 15 6 9 0 0 10 1 53 17 7 1 1 0 3 10 9 35 10 3 5 1 0 5 10 3 36 16 6 7 1 0 8 10 7 25 . . 7 19 1 1 2 |
Аналогичный номер детали - LA3410 |
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Аналогичное описание - LA3410 |
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