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TPA6138A2 Scheda tecnica(PDF) 8 Page - Texas Instruments |
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TPA6138A2 Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 22 page O L c 1 C = 2 R f p c L O 1 f = 2 R C p Click and Pop Suppression Short-Circuit Protection GND Bias Circuitry VSS CN CP VDD –INR +INR OUTL –INL OUTR +INL Mute GND UVP Driver Headphone Driver 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 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: TPA6138A2 |
Codice articolo simile - TPA6138A2_15 |
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Descrizione simile - TPA6138A2_15 |
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