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| Audio ICs Dual preamplifier BA328 / BA328F The BA328 and BA328F are monolithic, dual-preamplifier ICs designed for car-audio systems. They require few external components and allow compact set designs while reducing the number of assembly processes. FApplications Car and home stereos FFeatures 1) Low noise. 2) Wide operating power supply voltage range. 3) Built-in bias circuit minimizes the number of external components required. 4) High open loop gain. 5) Good channel balance. FInternal circuit diagram 212 Audio ICs FAbsolute maximum ratings (Ta = 25_C) BA328 / BA328F FRecommended operating voltage range (Ta = 25_C) FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, f= 1kHz, RL = 10k and RE = 100) 213 Audio ICs FMeasurement circuit BA328 / BA328F FAttached components CIN: input coupling capacitor The recommended value is 10F. If the value of the capacitor is too small the characteristics at power on will deteriorate. CO: Output coupling capacitor No particular requirements. A value of 4.7 to 22F is appropriate. CE: AC signal bypass capacitor The recommended value is 47F. This capacitor sets the bass gain. If a capacitor larger than the recommended value is used, the bass-region gain will increase, but the characteristics at power on will deteriorate. If the value of the capacitor is made smaller than the recommended value, the bass-region gain will be lower, but the power on characteristics will improve. C1 and R1 Ripple filter components The larger R1 and C1 are made, the better the ripple rejection ratio will be. However, if R1 is made too large, the voltage drop that results will influence the maximum output. Feedback pin: The closed loop voltage gain is roughly Znt / RE. 214 Audio ICs FApplication example BA328 / BA328F FOperation notes Determining the DC output voltage (see Fig. 3) The DC output voltage is determined as follows: VODC = (Rnt Io) + VP2 (7) VP2 (7): DC voltage on pin 2 (7) Rnt: DC feedback resistance IO is set internally. In other words, pin 7 is a fixed current source, and when that current flows into the feedback pin, the voltage generated becomes the DC voltage. VP2 (7) is fixed at about 0.8V. When VODC is about 1 / 2 the power supply voltage, VOM is maximized. IO is fixed regardless of the power supply voltage. Therefore, it is possible to set the DC feedback resistance after considering the required dynamic range and the minimum voltage applied to pin 4 (VCC). The recommended value is 100k for a power supply voltage of 6V to 16V. 215 Audio ICs FElectrical characteristics curves BA328 / BA328F FExternal dimensions (Units: mm) 216 |
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