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Products: <strong>Audio</strong> Amplifiers<br />
Class-AB Headphone <strong>Audio</strong> Power Amplifiers<br />
19<br />
➔<br />
138-mW DirectPath HP Amplifer<br />
with I 2 C Volume Control<br />
TPA6130A2<br />
www.ti.com/sc/device/TPA6130A2<br />
Class-AB headphone amplifiers typically drive 16- or 32-Ω loads. There<br />
are three main implementations as indicated in the diagrams below:<br />
• Traditional (DC-blocking capacitors)<br />
• Capless (V BIAS on ground sleeve)<br />
• Charge-pump based/ground reference (DirectPath)<br />
The first device to be released with TI’s patented DirectPath<br />
technology was the well-known TPA4411. The latest DirectPath<br />
headphone amplifier, the TPA6130A2, offers even more features<br />
and benefits.<br />
Key Features<br />
• DirectPath architecture<br />
• Removes need for bulky DC-blocking output capacitors<br />
• Improves bass response<br />
• 64 levels of volume control (-59.5 to 4 dB) programmable<br />
through I 2 C bus for optimized SNR<br />
• Differential inputs provide 68 dB of CMRR, rejecting unwanted<br />
common-mode noise present on the inputs.<br />
• Design provides 109 dB of PSRR to reject unwanted noise present<br />
on the power supply.<br />
• Wide 2.5- to 5.5-V supply range allows direct connect to battery.<br />
• Lowest quiescent current for a DirectPath HP amplifier (4 mA)<br />
allows longer listening time.<br />
• Packaging: WCSP (2x2 mm) and QFN (4x4 mm)<br />
Applications<br />
• Wireless handsets (see System Block Diagram on page 26)<br />
• Multimedia handsets<br />
• Portable media players (see System Block Diagram on pages 24)<br />
To Know More<br />
• For a complete list of Class-AB Headphone <strong>Audio</strong> Power<br />
Amplifiers, see the Selection <strong>Guide</strong> on page 35.<br />
Traditional<br />
Capless<br />
DirectPath<br />
C O<br />
Class-AB Headphone <strong>Audio</strong> Power Amplifiers<br />
C O<br />
V BIAS<br />
Output Power/Channel (Max)<br />
1.5 W<br />
TPA6120A2 (Stereo)<br />
150 mW<br />
TPA611xA2 (Stereo)<br />
138 mW<br />
TPA6130A2 (Stereo)<br />
FEATURED PRODUCT<br />
80 mW<br />
TPA4411 (Stereo)<br />
75 mW<br />
TPA152 (Stereo)<br />
50 mW TPA610xA2 (Stereo)<br />
1.6 V 1.8 V 2.5 V 3.6 V 4.5 V 5.5 V 10 V 30 V<br />
Supply Voltage<br />
Texas Instruments <strong>1Q</strong> <strong>2007</strong><br />
<strong>Audio</strong> <strong>Solutions</strong> <strong>Guide</strong>