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BA3529AFP Datasheet(PDF) 6 Page - Rohm |
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BA3529AFP Datasheet(HTML) 6 Page - Rohm |
6 / 14 page ![]() 390 Audio ICs BA3528AFP / BA3529AFP FCircuit operation (1) Preamplifier In the preamplifier input stage the pin 22 bias is the input and the negative feedback virtual earth, and the bias for the input stage transistor is taken from pin 22 via the tape head to allow direct coupling. Connect a 1000pF capaci- tor in parallel with the tape head to prevent high-frequen- cy interference (see Fig. 2). (2) Mute amplifier Preamplifier output muting can be switched on and off. The mute is off when the mute switch input (pin 1) is low or open, and on when the mute switch input is high (tied to VCC via a resistor), see Fig. 3. (3) Equalizer The preamplifier is based on an NAB120 µs NF-type equalizer. It is possible to add a switching function for the equalizer using the mute amplifier. Switching of the equalizer constant is controlled by the voltage on pin 1 (low or high). Note, however, when this is done, preampli- fier muting no longer operates (see Fig. 4). (4) Power amplifier The power amplifier employs an NF circuit with fixed gain. GVC = 36dB (BA3528AFP) and GVC = 27dB (BA3529AFP). For the input stage, the pin 22 bias point is the input and the negative feedback virtual earth point, and the first stage transistor bias is taken from pin 22. The built-in VREF amplifier uses the same bias point as its input, and its out- put voltage is about the same as DC output voltage from the power amplifier. This becomes the virtual earth for the headphones (see Fig. 5). |
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