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EUA6027AQIR1 Datasheet(PDF) 11 Page - Eutech Microelectronics Inc |
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EUA6027AQIR1 Datasheet(HTML) 11 Page - Eutech Microelectronics Inc |
11 / 14 page EUA6027A DS6027A Ver 1.1 June 2008 11 Application Information Shutdown Modes The EUA6027A employs a shutdown mode of operation designed to reduce supply current, IDD, to the absolute minimum level during periods of nonuse for battery-power conservation. The SHUTDOWN input terminal should be held high during normal operation when the amplifier is in use. Pulling SHUTDOWN low causes the outputs to mute and the amplifier to enter a low-current state, IDD=150µA. SHUTDOWN should never be left unconnected because amplifier operation would be unpredictable. Gain Setting via GAIN0 and GAIN1 Inputs The gain of the EUA6027A is set by two input terminals, GAIN0 and GAIN1. Table 1 .Gain Settings GAIN0 GAIN1 AV(inv) Input Impedance 0 0 6dB 90kΩ 0 1 10dB 70kΩ 1 0 15.6dB 45kΩ 1 1 21.6dB 25kΩ The gains listed in Table 1 are realized by changing the taps on the input resistors inside the amplifier. This causes the input impedance, ZI, to be dependent on the gain setting. The actual gain settings are controlled by ratios of resistors, so the actual gain distribution from part-to-part is quite good. However, the input impedance will shift by 30% due to shifts in the actual resistance of the input impedance. For design purposes, the input network (discussed in the next section) should be designed assuming an input impedance of 10 kΩ, which is the absolute minimum input impedance of the EUA6027A. At the higher gain settings, the input impedance could increase to as high as 115 kΩ. The typical input impedance at each gain setting is given in Table 1. Input Capacitor, Ci In the typical application an input capacitor, Ci, is required to allow the amplifier to bias the input signal to the proper dc level for optimum operation. In this case, Ci and the input impedance of the amplifier, Zi, form a high-pass filter with the corner frequency determined in equation 1. fc(highpass)= i iC Z 2 1 π -----------------(1) The value of Ci is important to consider as it directly affects the bass (low frequency) performance of the circuit. Consider the example where Zi is 70kΩ and the specification calls for a flat bass response down to 40Hz. Equation 2 is reconfigured as equation 2. Ci = C f Z 2 1 i π ----------------------------(2 ) In this example, Ci is 56nF so one would likely choose a value in the range of 56nF to 1µF. A further consideration for this capacitor is the leakage path from the input source through the input network (Ci) and the feedback network to the load. This leakage current creates a dc offset voltage at the input to the amplifier that reduces useful headroom, especially in high gain applications. For this reason, a low- leakage tantalum or ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most applications as the dc level there is held at VDD/2, which is likely higher than the source dc level. Note that it is important to confirm the capacitor polarity in the application. Power Supply Decoupling, (CS) The EUA6027A is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also prevents oscillations for long lead lengths between the amplifier and the speaker. The optimum decoupling is achieved by using two capacitors of different types that target different types of noise on the power supply leads. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 0.1µF placed as close as possible to the device VDD lead, works best. For filtering lower-frequency noise signals, a larger aluminum electrolytic capacitor of 10µF or greater placed near the audio power amplifier is recommended. |
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