Audio Solutions Guide, 1Q 2007

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