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TDA8559 数据表(PDF) 5 Page - NXP Semiconductors |
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TDA8559 数据表(HTML) 5 Page - NXP Semiconductors |
5 / 32 page 1997 Jun 27 5 Philips Semiconductors Product specification Low-voltage stereo headphone amplifier TDA8559 Output amplifiers The output amplifiers have a transresistance of 50 k Ω, a bandwidth of approximately 750 kHz and a maximum output current of 100 mA. The mid-tap output voltage equals the voltage applied at the non-inverting pin of the output amplifier. This pin is connected to the output of the 0.5VP buffer. This reduces the distortion when the load is connected between an output amplifier and the buffer (because feedback is applied over the load). Buffer The buffer delivers 0.5VP to the output with a maximum output (sink and source) current of 200 mA (peak). Dynamic quiescent controller The Dynamic Quiescent Current controller (DQC) gives the advantage of low quiescent current and low distortion. When there are high frequencies in the output signal, the DQC will increase the quiescent current of the two output amplifiers and the buffer. This will reduce the cross-over distortion that normally occurs at high frequencies and low quiescent current. The DQC gives output currents that are linear with the amplitude and the frequency of the output signals. These currents control the quiescent current. Stabilizer The TDA8559 has a voltage supply range from 1.9 to 30 V. This range is divided over two supply voltage pins. Pin 16 is 1.9 to 18 V (breakdown voltage of the process); this pin is preferred for supply voltages less than 18 V. Pin 15 is used for applications where VP is approximately 6 to 30 V. The stabilizer output is internally connected to the supply voltage pin 16. In the range from 6 to 18 V, the voltage drop to pin 16 is 1 V. In the range from 18 to 30 V the stabilizer output voltage (to pin 16) is approximately 17 V. Input logic The MUTE pin (pin 7) selects the mute mode of the V/I converters. LOW (TTL/CMOS) level is mute. A voltage between 0.5 V (low level) and 1.5 V (high level) causes a soft mute to operate (no plops). When pin 7 is floating or greater than 1.5 V it is in the operating condition. The input mode pin must be connected to VP when the supply voltage is greater than 6 V. The input mode logic raises the tail current of the V/I converters and enables the two buffers to bias the inputs of the V/I converters. Reference This circuit supplies all currents needed in this device. With the standby mode pin 1 (TTL/CMOS), it is possible to switch to the standby mode and reduce the total quiescent current to below 10 µA. |
类似零件编号 - TDA8559 |
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类似说明 - TDA8559 |
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