Inside

Video solutions for PC platforms

Fastest low power, 10-bit, 1.25-MSPS serial ADC

GPLynx simplifies 1394 implementation

Single-chip, 900 MHz RF downcoverter

900-MHz RF transmit driver extends system performance

350-mW low-voltage audio amplifiers

First 2-W stereo audio amplifier sytems with depop circuitry

Highest-bandwidth low-voltage rail-to-rail CMOS op amp

High-speed wide supply voltage op amp

TCM38C17 QCombo Quad-Channel PCM Codec/Filter Combo

New amplifiers data book now available

CD now stands for changing data

350-mW low-voltage audio amplifiers

Product Features

• Fully characterized for 3.3-V and 5-V operation
• Output power @ 8 :
  • 250 mW, 5.0 V, BTL
  • 250 mW, 5.0 V, SE*
  • 200 mW, 3.3 V, BTL
  • 75 mW, 3.3 V, SE*
  • SE/BTL switch*
• Integrated depop circuitry
• Surface mount packaging
• Characterized for operation from 0°C to 70°C

TI's Family of Audio Power Amplifiers
Device	Description
TPA301	350-mW mono, BTL
TPA311	350-mW mono, SE/BTL
TPA302	300-mW stereo, SE
TPA4860	1-W mono, BTL w/hp sense
TPA4861	1-W mono, BTL
TPA0102	1.5-W stereo, SE/BTL
TPA0202	2.0-W stereo, SE/BTL w/ depop
TPA0103	1.75-W mono, BTL stereo, SE
TPA1517	6-W stereo, SE

The TPA301 and TPA311 are low-voltage amplifiers designed for low-power audio applications. Each device is capable of delivering 200 mW into an 8- load from a 3.3-V single supply or 350 mW from a 5-V single supply. Total Harmonic Distortion driving an 8-, bridge-tied load (BTL) is less than 0.5%. These features provide power and fidelity for applications including:

• Cellular phones
• Pagers
• Personal digital assistance (PDA)
• Battery powered toys
• Point-of-sale (POS) terminals

The TPA311 features an integrated single-ended/bridge-tied load (SE/BTL) switch for end products that utilize both headphones and speakers. This switch configures the output of the TPA311 for driving headphones (SE) or speakers (BTL). For example, the TPA311 would work well driving the external speaker of a cellular phone for hands-free conference calls or driving the earphone for hands-free personal calls.

Of course not all systems need to drive both headphones and an external speaker. The TPA301 is streamlined for BTL operation and is not capable of operating SE. The end result is a simple cost-effective way to drive a mono speaker.

Both amplifiers feature a shutdown pin to minimize power consumption. Additionally, the TPA311 features integrated depop circuitry that eliminates speaker noise when exiting shutdown mode.

The TPA301 and TPA311 are available in both 8-pin SOIC and thermally enhanced MSOP PowerPAD packages.

• TPA301D
  
• TPA311D