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LY8006UL Datasheet(PDF) 11 Page - Lyontek Inc. |
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LY8006UL Datasheet(HTML) 11 Page - Lyontek Inc. |
11 / 16 page LY8006 1.4 W Mono Filterless Class D Audio power Amplifier (MSOP / DFN) Rev. 1.7 - Compatible with LY8890/8891/8891B Single-Ended Input Lyontek Inc. reserves the rights to change the specifications and products without notice. 5F, No. 2, lndustry E . Rd. IX, Science-Based Industrial Park, Hsinchu 300, Taiwan TEL: 886-3-6668838 FAX: 886-3-6668836 11 ® APPLICATION INFORMATION Input Resistors (Ri) and Gain The input resistors (Ri) set the gain of the amplifier according to the equation. Pre-Amplifier Gain = (Rf / Ri) x 2 = [150KΩ / ( 5KΩ + Ri )] x 2 Total Gain = [(Rf / Ri) x 2] x 2 = {[150KΩ / ( 5KΩ + Ri )] x 2} x 2 AVD = 20 x log {2 x [(Rf /Ri ) x2]} The resistor matching is very important in the amplifiers. Balance of the output on the reference voltage depends on matched ratio of the resistors. CMRR, PSRR, and cancellation of the second harmonic distortion 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 LY8006 to limit noise injection on the high-impedance nodes. For optimal performance the gain should be set to 2 V/V or lower. Lower gain allows the LY8006 to operate at its best, For example Table 1. Typical Total Gain and AVD Values Rf (KΩ) 150 150 150 150 150 150 Ri (KΩ) 300 150 100 75 50 37.5 Pre AMP. Gain 1 2 3 4 6 8 Total Gain 2 4 6 8 12 16 AVD (db) 6.02 12.04 15.56 18.06 21.58 24.08 Input Capacitors (Ci) The LY8006 using a single-ended source, So the input coupling capacitors are required. The input capacitors and input resistors form a high-pass filter with the corner frequency(fc), determined in the equation. fc = 1 / ( 2πRi Ci ) The value of the input capacitor is important to consider as it directly affects the bass (low frequency) performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the corner frequency can be set to block low frequencies in this application. Equation is reconfigured to solve for the input coupling capacitance. Ci = 1 / ( 2πRi fc ) If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or better, because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below. |
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