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TPA6138A2 Scheda tecnica(PDF) 8 Page - Texas Instruments

Il numero della parte TPA6138A2
Spiegazioni elettronici  TPA6138A2 DirectPath??Headphone Driver With Adjustable Gain
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TPA6138A2 Scheda tecnica(HTML) 8 Page - Texas Instruments

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Circuitry
VSS
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VDD
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GND
UVP
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Headphone
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Headphone
TPA6138A2
SLOS704B – JANUARY 2011 – REVISED AUGUST 2015
www.ti.com
9.2 Functional Block Diagram
9.3 Feature Description
9.3.1 Direct Path Headphone Driver
Single-supply line-driver amplifiers typically require dc-blocking capacitors. The top drawing in Figure 7 illustrates
the conventional line-driver-amplifier connection to the load and output signal. DC blocking capacitors are often
large in value. The headphone load (typical resistive values of 16
Ω to 32 Ω) combine with the dc blocking
capacitors to form a high-pass filter. Equation 1 shows the relationship between the load impedance (RL), the
capacitor (CO), and the cutoff frequency (fC).
(1)
CO can be determined using Equation 2, where the load impedance and the cutoff frequency are known.
(2)
If fC is low, the capacitor must then have a large value because the load resistance is small. Large capacitance
values require large package sizes. Large package sizes consume PCB area, stand high above the PCB,
increase cost of assembly, and can reduce the fidelity of the audio output signal.
8
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