New Products Extend TI's Audio Amplifier Lineup
Devices Include First 2-W Stereo Audio Amp with Depop Plus Low-Power Solutions
DALLAS (Feb. 16, 1998) -- Broadening its portfolio through innovative analog technology, Texas Instruments announced today a new single-chip audio solution for stereo systems, plus two new low-voltage, low-power audio amplifiers. The new devices extend TI's comprehensive line of highly differentiated audio solutions for low-voltage midrange and high-end portable applications.
The new devices have been designated the TPA0202, TPA301 and the TPA311, respectively.
"The introduction of these three products underlines TI's commitment to offer an optimal selection of amplifiers for audio applications," said Don Dapkus, a member of TI's Advanced Analog Products Systems Engineering Group. "As the number of audio applications grows, we are broadening our audio amplifier portfolio to meet the needs of designers for new low-power, highly differentiated solutions."
TPA0202 -- A Complete Audio Amplifier Solution
The TPA0202, which is the first 2-W stereo audio amp to feature integrated depop circuitry, offers a one-chip audio amp solution for applications with low-impedance speakers such as desktop and notebook computers, portable multimedia systems and speakerphones. Along with the ability to drive both headphones and stereo speakers, the device features high output power and ultra-low distortion. The TPA0202 is packaged in a super low-profile, thermally enhanced, thin shrink small-outline (TSSOP) PowerPAD™ package, which is excellent for use in space-limiting conditions, like those found in mobile systems.
Providing superior sound in portable applications, the TPA0202 is capable of delivering 2 watts of continuous average power to each of two 3-ohm speakers in a 5-volt system, and 600 milliwatts in a 3-volt system. Ultra-low distortion, measuring less than 0.06 percent THD+N at 2 watts and 3 ohms, guarantees clear, crisp sound.
An integrated switch configures the amp to operate in single-ended (SE) mode for headphones or in bridge-tied load (BTL) mode for speakers, reducing device count, board space and system cost. A shutdown mode helps prolong battery life by dropping supply current to 5. The integrated depop circuitry makes shutdown transparent by eliminating clicks and pops in the speakers during transitions between modes. For ease of design, an integrated stereo multiplexer can switch the amplifier inputs between two sets of pins, allowing the designer to equalize speakers and headphones through different feedback networks to achieve the best possible sound level and balance in each.
TPA301, TPA311 -- Solutions for Low-power Applications
The TPA301 and TPA311 are low-voltage amplifiers designed for low-power audio applications such as cellular phones and personal communications systems (PCS), voice pagers, personal digital assistants (PDAs), battery-powered toys and point-of-sale (POS) terminals.
For design versatility in battery-powered systems, each device is fully specified for both 3.3- and 5-volt operation, and each is capable of delivering 250 milliwatts to an 8-ohm speaker from a 3.3-volt power supply or 350 milliwatts from a 5-volt supply. Low harmonic distortion of less than one percent assures a high level of sound fidelity. Both amplifiers feature a shutdown mode to minimize power consumption and prolong battery life, as well as integrated depop circuitry to eliminate speaker noise when exiting shutdown mode.
The TPA301 is streamlined for BTL operation only, offering a simple, cost-effective way to drive a mono speaker. By contrast, the TPA311 features an integrated SE/BTL switch for products that use both speakers and headphones. An instance of a system in which the '311 would work well is a cellular phone designed for hands-free operation, where the TPA311 would be able to drive both the ear phone in a headset or the internal speaker for hands-on personal calls.
Pricing and Availability
The TPA0202, TPA301 and TPA311 are available now from Texas Instruments and its authorized distributors. The TPA0202 comes in a 24-pin thermally enhanced TSSOP PowerPAD package; and the TPA301 and TPA311 are available in an 8-pin small outline IC (SOIC) package. Suggested resale pricing in quantities of 1,000 is $2.83 for the TPA0202, $.67 for the TPA301 and $.85 for the TPA311.
More information regarding TI's audio power amplifier products and the PowerPAD package is available on the World Wide Web at 
http://www.ti.com/sc/opamp.
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