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YMF795 Datasheet(PDF) 35 Page - YAMAHA CORPORATION |
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YMF795 Datasheet(HTML) 35 Page - YAMAHA CORPORATION |
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35 / 45 page  YMF795 -35- ■Sound Quality Correction Circuit Sound quality and Gain can be corrected by using an external circuit connected to EQ1 to 3 pins. The internal circuit configuration of EQ1 to 3 pin and example of the external circuit are as follows. Gain and filter characteristic can be controlled by a value of C1, C2, R1, and R2. Gain = R2 / R1. The recommended values: R1 = 22 k Ω and R2 = 82 kΩ (Gain = 3.7 times). Filter cutoff frequency of f1 and f2 is: f1 = 1/ (2π×R1×C1). f2 = 1/ (2π×R2×C2). If C1 = 0.022 µF and C2 = 120 pF, the cutoff frequency of f1 = 330 Hz and f2 = 16 kHz. Moreover, the circuit enclosed with the dotted line is required when mixing with analog signal from AIN is desired. The level adjustment for mixing depends on the resistance ratio R2/Rx of Rx and R2. The value of Rx should be 82 kΩ when mixing of amplitude of one time is required. f1 f2 Gain1 Gain1 -3dB Gain Freq + VREF - EQ2 EQ3 FM VOL EQ1 R1 R2 C2 C1 Rx C3 AIN |
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