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TPA6138A2 Arkusz danych(PDF) 11 Page - Texas Instruments

Numer części TPA6138A2
Szczegółowy opis  DirectPath Headphone Driver With Adjustable Gain
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Strona internetowa  http://www.ti.com
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TPA6138A2 Arkusz danych(HTML) 11 Page - Texas Instruments

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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
10 k
–1.5 V/V
8.2 k
12 k
–2 V/V
15 k
30 k
–10 V/V
4.7 k
47 k
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
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