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LA3410 датащи(PDF) 9 Page - Sanyo Semicon Device |
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LA3410 датащи(HTML) 9 Page - Sanyo Semicon Device |
9 / 13 page LA3410 No.1407–9/13 Decoder circuit (Refer to the Block Diagram in the Sample Application Circuit.) The LA3410 adopts a decoder circuit of chopper type. The sub signal sync-detected by this decoder is applied to the post amplifier minus input through RB as shown in the Sample Application Circuit. This signal is matrixed with the main signal coming out of A3. The demodulation method is, in a sense, a combination of switching method and matrix method. The gain for the sub signal is : R1, R2 : Post amplifier feedback resistor VS : Peak value of input sub signal The gain for the main signal is : VR1 : Semifixed resistor for separation adjust VM : Peak value of input main signal In the LA3410, the gain of the main signal is varied with VR1 to adjust the separation. The IF output is generally such that the sub signal level is lower than the main signal level. In this case also, the separation can be adjusted. 3. De-emphasis The de-emphasis characteristic depends on the feedback resistors, capacitors of the post amplifier. R1, R2, C3, C4 in the Sample Application Circuit are set as R1C3=R2C4=50 µs, 75µs. Table 3 shows the values of R1, R2, C3, C4 and the de-emphasis constants. Table 3 The post amplifier requires feedback capacitors C3, C4 regardless of the de-emphasis characteristic. Without these capacitors, the stereo distortion gets worse. 4. Low-pass filter Fig. 8 shows a sample circuit configuration where an LC filter is used as the low-pass filter and Fig. 16 shows a sample characteristic of this filter. As compared with the LPF (BL-13) in the Sample Application Circuit, the use of this filter makes the attenuation less at 19kHz, 38kHz ; therefore, carrier leak at the LPF output causes the stereo distortion and separation characteristic to get worse than specified in the Operating Characteristics. For the stereo distortion, the BL- 13 provides approximately 0.02%, while the LC filter provides approximately 0.5% VS · or VS · R1 RB 2 π R2 RB 2 π VM · or VM · VR1 RA+VR1 R1 RC VR1 RA+VR1 R2 RC ) 2 R ( 1 Rs µ 0 5 ) 4 C ( 2 Cs µ 5 7 ) 4 C ( 2 C k 3 3 Ω F p 0 0 5 1F p 0 0 2 2 k 9 3 Ω F p 0 0 2 1F p 0 0 0 2 k 1 5 Ω F p 0 0 0 1F p 0 0 5 1 k 2 6 Ω F p 0 5 7F p 0 0 0 1 k 2 8 Ω F p 0 2 6F p 0 1 9 k 0 1 1 Ω F p 0 7 4F p 0 8 6 k 0 3 1 Ω F p 0 9 3F p 0 6 5 |
Аналогичный номер детали - LA3410 |
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Аналогичное описание - LA3410 |
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