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SA58670BS Datasheet(PDF) 9 Page - NXP Semiconductors |
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SA58670BS Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 18 page SA58670_1 © NXP B.V. 2007. All rights reserved. Objective data sheet Rev. 01 — 22 June 2007 9 of 18 NXP Semiconductors SA58670 2.1 W/channel stereo Class D audio amplifier 11. Application information 11.1 Power supply decoupling considerations The SA58670 is a stereo Class D audio amplifier that requires proper power supply decoupling to ensure the rated performance for THD+N and power efficiency. To decouple high frequency transients, power supply spikes and digital noise on the power bus line, a low Equivalent Series Resistance (ESR) capacitor, of typically 1 µF is placed as close as possible to the PVDD terminals of the device. It is important to place the decoupling capacitor at the power pins of the device because any resistance or inductance in the PCB trace between the device and the capacitor can cause a loss in efficiency. Additional decoupling using a larger capacitor, 4.7 µF or greater may be done on the power supply connection on the PCB to filter low frequency signals. Usually this is not required due to high PSRR of the device. 11.2 Input capacitor selection The SA58670 does not require input coupling capacitors when used with a differential audio source that is biased from 0.5 V to VDD − 0.8 V. In other words, the input signal must be biased within the common-mode input voltage range. If high pass filtering is required or if it is driven using a single-ended source, input coupling capacitors are required. The high pass corner frequency created by the input coupling capacitor and the input resistors (see Table 6) is calculated by Equation 1: (1) Since the value of the input decoupling capacitor and the input resistance determined by the gain setting affects the low frequency performance of the audio amplifier, it is important to consider in the system design. Small speakers in wireless and cellular phones usually do not respond well to low frequency signals, so the high pass corner frequency may be increased to block the low frequency signals to the speakers. Not using input coupling capacitors may increase the output offset voltage. Equation 1 is solved for Ci: (2) Table 6. Gain selection G1 G0 Gain (V/V) Gain (dB) Input impedance (k Ω) 00 2 6 28.1 01 4 12 17.3 10 8 18 9.8 1 1 16 24 5.2 f C 1 2 π R i × C i × ----------------------------- = C i 1 2 π R i × f C × ----------------------------- = |
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