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TPA6132A2RTER 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 TPA6132A2RTER
상세설명  25-mW DirectPath Stereo Headphone Amplifier With Pop Suppression
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TPA6132A2
www.ti.com
SLOS597A – DECEMBER 2008 – REVISED OCTOBER 2014
8.3 Feature Description
8.3.1 Headphone Amplifiers
Single-supply headphone amplifiers typically require dc-blocking capacitors to remove dc bias from their output
voltage. The top drawing in Figure 23 illustrates this connection. If dc bias is not removed, large dc current will
flow through the headphones which wastes power, clip the output signal, and potentially damage the
headphones.
These dc-blocking capacitors are often large in value and size. Headphone speakers have a typical resistance
between 16
Ω and 32 Ω. This combination creates a high-pass filter with a cutoff frequency as shown in
Equation 1, where RL is the load impedance, CO is the dc-block capacitor, and fC is the cutoff frequency.
(1)
For a given high-pass cutoff frequency and load impedance, the required dc-blocking capacitor is found as:
(2)
Reducing fC improves low frequency fidelity and requires a larger dc-blocking capacitor. To achieve a 20 Hz
cutoff with 16
Ω headphones, CO must be at least 500 μF. Large capacitor values require large packages,
consuming PCB area, increasing height, and increasing cost of assembly. During start-up or shutdown the dc-
blocking capacitor has to be charged or discharged. This causes an audible pop on start-up and power-down.
Large dc-blocking capacitors also reduce audio output signal fidelity.
Two different headphone amplifier architectures are available to eliminate the need for dc-blocking capacitors.
The Capless amplifier architecture is similar provides a reference voltage to the headphone connector shield pin
as shown in the middle drawing of Figure 23. The audio output signals are centered around this reference
voltage, which is typically half of the supply voltage to allow symmetrical output voltage swing.
When using a Capless amplifier do not connect the headphone jack shield to any ground reference or large
currents will result. This makes Capless amplifiers ineffective for plugging non-headphone accessories into the
headphone connector. Capless amplifiers are useful only with floating GND headphones.
Copyright © 2008–2014, Texas Instruments Incorporated
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