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PAM8301AAF Datasheet(PDF) 8 Page - Power Analog Micoelectronics |
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PAM8301AAF Datasheet(HTML) 8 Page - Power Analog Micoelectronics |
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8 / 11 page  8 09/2008 Rev 1.2 , Power Analog Microelectronics Inc Application Information www.poweranalog.com PAM8301 Filterless Class-D Mono Audio Amplifier Maximum Gain As shown in block diagram (page 2), the PAM8301 has two internal amplifier stages. The first stage's gain is externally con figurable, while the second stage's is internally fixed. The closed-loop gain of the first stage is set by selecting the ratio of R to R while the second stage's gain is fixed at 2x.The output of amplifier 1 serves as the input to amplifier 2, thus the two amplifiers produce signals identical in magnitude, but different in phase by 180°. Consequently, the differential gain for the IC is A =20*log [2*(R /R )] The PAM8301 sets maximum R =80k , minimum R =10k , so the maximum closed-gain is 24dB. f i VD f i f i Ω Ω Input Capacitors (Ci) Power Supply Decoupling (Cs) Shutdown Operation For the best power on/off pop performance, the amplifier should be set in the shutdown mode prior to power on/off operation. Under Voltage Lock-out (UVLO) In typical application, an input capacitor, Ci, is required to allow the amplifier to bias input signals to a proper DC level for optimum operation. In this case, Ci and the minimum input impedance Ri (10k internal) form a high pass filter with a corner frequency determined by the following equation: It is important to choose the value of Ci as it directly affects low frequency performance of the circuit, for example, when an application requires a flat bass response as low as 100Hz. Equation is reconfigured as follows: As the input resistance is variable, for the Ci value of 0.16 F, one should actually choose the Ci within the range of 0.1 F to 0.22 F. A further consideration for this capacitor is the leakage path from the input source through the input network (Ri, RF, Ci) 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 application. For this reason, a low leakage tantalum or ceramic capacitor is the best choice. When a polarized capacitor is used, the positive side of the capacitor should face the amplifier input in most applications as the DC level is held at VDD/2, which is likely higher than the source DC level. Please note that it is important to confirm the capacitor polarity in the application. The PAM8301 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output THD and PSRR as low as possible. Power supply decoupling affects low frequency r esponse. 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 1.0μF is good, placing it as close as possible to the device VDD terminal. For filtering lower-frequency noise signals, a capacitor of 10μF or larger, closely located to near the audio power amplifier is recommended. In order to reduce shutdown power consumption, the PAM8301 contains shutdown circuitry for turn off the amplifier. This shutdown feature turns the amplifier off when a logic low is applied on the SHDOWN pin. By switching the shutdown pin over to GND, the PAM8301 supply current draw will be minimized in idle mode. The PAM8301 incorporates circuitry to detect low on or off voltage. When the supply voltage drops to 2.1V or below, the PAM8301 goes into a state of shutdown, and the device comes out of its shutdown state and starts to normal operation by reset the power supply or pin. μ μμ SD () C 1 f 2RiCi p = () ic 1 Ci 2R f p = |
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