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TPA6138A2 Datasheet(PDF) 11 Page - Texas Instruments |
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TPA6138A2 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 22 page cIN IN IN IN cIN IN 1 1 f = C = 2 R C 2 f R or p p TPA6138A2 www.ti.com SLOS704B – JANUARY 2011 – REVISED AUGUST 2015 10 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 10.1 Application Information The TPA6138A2 starts its operation by asserting the MUTE pin to logic 1. The device enters in mute mode when pulling low MUTE pin. The charge pump generates a negative supply voltage. The charge pump flying capacitor connected between CP and CN transfers charge to generate the negative supply voltage. The output voltages are capable of positive and negative voltage swings and are centered close to 0 V, eliminating the need for output capacitors. Input coupling capacitors block any dc bias from the audio source and ensure maximum dynamic range. The device has built-in pop suppression circuitry to completely eliminate pop noise during turn- on, turn-off and enter or exit shutdown mode. 10.1.1 Gain-Setting Resistor Ranges The gain-setting resistors, RIN and Rfb, must be chosen so that noise, stability, and input capacitor size of the TPA6138A2 are kept within acceptable limits. Voltage gain is defined as Rfb divided by RIN. Selecting values that are too low demands a large input ac-coupling capacitor, CIN. Selecting values that are too high increases the noise of the amplifier. Table 1 lists the recommended resistor values for different inverting- input gain settings. Table 1. Recommended Resistor Values INPUT RESISTOR VALUE, RIN FEEDBACK RESISTOR VALUE, GAIN Rfb –1 V/V 10 k Ω 10 k Ω –1.5 V/V 8.2 k Ω 12 k Ω –2 V/V 15 k Ω 30 k Ω –10 V/V 4.7 k Ω 47 k Ω 10.1.2 Input-Blocking Capacitors DC input-blocking capacitors are required to be added in series with the audio signal into the input pins of the TPA6138A2. These capacitors block the dc portion of the audio source and allow the TPA6138A2 inputs to be properly biased to provide maximum performance. These capacitors form a high-pass filter with the input resistor, RIN. The cutoff frequency is calculated using Equation 5. For this calculation, the capacitance used is the input-blocking capacitor and the resistance is the input resistor chosen from Table 1; then the frequency and/or capacitance can be determined when one of the two values is given. It is recommended to use electrolytic capacitors or high-voltage-rated capacitors as input blocking capacitors to ensure minimal variation in capacitance with input voltages. Such variation in capacitance with input voltages is commonly seen in ceramic capacitors and can increase low-frequency audio distortion. (5) Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPA6138A2 |
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