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BA7726AFS Datasheet(PDF) 9 Page - Rohm |
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BA7726AFS Datasheet(HTML) 9 Page - Rohm |
9 / 11 page 9 Multimedia ICs BA7726AS / BA7726AFS (5) LPF • Use the internal operational amplifier and an attached capacitor and resistor to configure a tertiary LPF for anti-aliasing and smoothing. Cutoff frequency LPF constant Pass band gain R1 R2 R3 C1 C2 C3 2kHz 22k Ω 56k Ω 47k Ω 6800pF 4700pF 270pF 0.6dB 3kHz 18k Ω 47k Ω 39k Ω 5600pF 3900pF 220pF 0.7dB 4kHz 15k Ω 39k Ω 33k Ω 4700pF 3300pF 180pF 0.8dB LPF constant examples (VCC = 9.0V) ∗ CMP OUT (pin 20) output is positively correlated with Vcc. When Vcc is a voltage other than 9.0V, set the pass band gain so that maximum CMP side LPF output (input to BU9252) is 5Vp-p. Make sure that the EXP side LPF constant does not exceed the load drive capability (minimum = 0.3mA, typical 0.5mA). 20 19 18 17 16 – + C3 R1 R3 C2 C1 R2 R1 C2 C1 R1 TO BU9252 FROM BU9252 Fig. 4 LPF (6) Vocal fader function • After the synchronous component of the left and right channels is eliminated, LPF output is added to the signal, which is then output (see figure below). The vocal component is difficult to remove from cer- tain types of sources. 56789 LINE LINE C2 C1 LPF + – IN L IN R TO OUTSW Fig. 5 Vocal fader block LPF constant examples Cutoff frequency LPF constant C1 C2 100Hz 0.022 µF 0.1 µF 150Hz 0.015 µF 0.068 µF 200Hz 0.01 µF 0.047 µF ∗ C1 and C2 are only necessary when using the vocal fader function. (7) ALC level • When Vcc is 9.0V, ALC level can be set roughly between -4dBV and +9dBV, and is determined by the voltage impressed on pin 28 (V28, set with resistive division between Vcc and the ground). ALC level is calculated with the following equation, although slight error occurs as V28 approaches VCC. 0 0 VCC = 9.0V 510 Set within this range + 10 + 5 –5 –10 Pin 28 voltage: V28 (V) at LINE OUT (f = 1kHz) Fig. 6 ALC level vs. pin 28 voltage ∗ These figures are for standard samples and are not guaranteed standards. VOAML 1.0 V28 0.85 × (VCC – 1.0), at LINE OUT 1 2 × 2 × (VCC – V28) [Vrms], |
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