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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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PAM8902A Arkusz danych(PDF) 7 Page - Diodes Incorporated |
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PAM8902A Arkusz danych(HTML) 7 Page - Diodes Incorporated |
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7 / 12 page  PAM8902A Document number: DSxxxxx Rev. 1 - 3 7 of 12 www.diodes.com February 2013 © Diodes Incorporated PAM8902A A Product Line of Diodes Incorporated Application Information Select Boost Converter Output Voltage The VSET pin sets the boost converter output voltage to 8V, 12V or 17.5V. VSET pin configuration table as below: VSET Pin Configuration Min Max PVCC Voltage Audio Amplifier Maximum Output Voltage High AVDD – 0.5 AVDD 17.5V 11 VRMS (VPP = 31.1V) Floating 1V AVDD – 1V 12V 8 VRMS (VPP = 22.6V) Low GND 0.5V 8V 5 VRMS (VPP = 14.1V) Gain Setting and Input Resistance (RI) Gain setting function is only available in disable condition (ENA = low) and need to follow the sequence as pull ENA to low (disable the IC) first, and change the GSET voltage between high, floating, low, then pull ENA to high (enable the IC). The input resistors (RI = RIN + REX) set the gain of the amplifier according to Equation 1 when anti-saturation is inactive. G = 20 Log [12.8*RF/ (RIN + REX)] (dB) GSET RIN RFB High 77.4kΩ 122.6kΩ Floating 100kΩ 100kΩ Low 122.6kΩ 77.4kΩ Where RIN is a 77.4KΩ internal resistor, REX is the external input resistor, RF is a 122.6KΩ internal resistor. Resistor matching is very important in fully differential amplifiers. The balance of the output on the reference voltage depends on matched ratios of the resistors. CMRR, PSRR, and cancellation of the second harmonic distortion diminish if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or better to keep the performance optimized. Matching is more important than overall tolerance. Resistor arrays with 1% matching can be used with a tolerance greater than 1%. Place the input resistors very close to the PAM8902A to limit noise injection on the high-impedance nodes. For optimal performance the gain should be set to lower. Lower gain allows the PAM8902A to operate at its best, and keeps a high voltage at the input making the inputs less susceptible to noise. In addition to these features, higher value of RI minimizes pop noise. Anti-Saturation/Clipping Function The anti-saturation circuitry detects the duty cycle of the PWM output. When the output starts to exhibit clipping, the gain is automatically decreased with an attack time of 100µs per step a release time of 186ms per step. The following table describes the operation: Variable Description Value Gain The original gain of the device when the Anti-saturation is inactive. 26dB (GSET = High) 22dB (GSET = Floating) 18dB (GSET = Low) Attenuation Range The gain control range when anti-saturation is active. -26dB (GSET = High) -22dB (GSET = Floating) -18dB (GSET = Low) Step Size Gain adjust step size. 0.25dB/Step Attack Time The minimum time between two gain decrements. 100µs Release Time The minimum time between two gain increments. 186ms |
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