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LME49600_14 Datasheet(数据表) 10 Page - Texas Instruments

部件型号  LME49600
说明  High Performance, High Fidelity, High Current Audio Buffer
下载  22 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
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LME49600 Datasheet(HTML) 10 Page - Texas Instruments

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LME49600
SNAS422D – JANUARY 2008 – REVISED MARCH 2008
www.ti.com
APPLICATION INFORMATION
HIGH PERFORMANCE, HIGH FIDELITY HEADPHONE AMPLIFIER
The LME49600 is the ideal solution for high output, high performance high fidelity head phone amplifiers. When
placed in the feedback loop of the LME49710, LME49720 or LME49740 High Performance, High Fidelity audio
operational amplifier, the LME49600 is able to drive 32
Ω headphones to a dissipation of greater than 500mW at
0.00003% THD+N while operating on ±15V power supply voltages. The circuit schematic for a typical headphone
amplifier is shown in Figure 27.
Operation
The following describes the circuit operation for the headphone amplifier’s Left Channel. The Right Channel
operates identically.
The audio input signal is applied to the input jack (HP31 or J1/J2) and dc-coupled to the volume control, VR1.
The output signal from VR1’s wiper is applied to the non-inverting input of U2-A, an LME49720 High
Performance, High Fidelity audio operational amplifier. U2-A’s AC signal gain is set by resistors R2, R4, and R6.
To allow for a DC-coupled signal path and to ensure minimal output DC voltage regardless of the closed-loop
gain, the other half of the U2 is configured as a DC servo. By constantly monitoring U2-A’s output, the servo
creates a voltage that compensates for any DC voltage that may be present at the output. A correction voltage is
generated and applied to the feedback node at U2-A, pin 2. The servo ensures that the gain at DC is unity.
Based on the values shown in Figure 27, the RC combination formed by R11 and C7 sets the servo’s high-pass
cutoff at 0.16Hz. This is over two decades below 20Hz, minimizing both amplitude and phase perturbations in the
audio frequency band’s lowest frequencies.
10
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Links: LME49600




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