Sunnyvale, Calif.--Dec. 23, 1997--Philips Semiconductors announced the first low-voltage, high-power, single-chip audio power amplifierto feature a fully integrated, push-button operated, digital volume control.
The new device (TDA8551) will reduce design costs associated withtenuator output control by reducing the number of components anddecreasing board space. The TDA8551 is also very flexible and issuitable for use in a vast range of applications, including hands-freetelephones, pocket radios, headphone amplifiers, walkie-talkies, videogames, answering machines, and toys.
Operating from a single 5-V supply, the TDA8551 deliversoutput power up to 1.4 W into an 8-ohm bridge-tied load, whileexhibiting a high degree of immunity to RF interference from sourcessuch as cellular phone power amplifiers and car ignition systems.
Up/down volume adjustment over an 80-dB range is easily achievedby connecting two push-button switches or a rocker switch to the IC'svolume control pin.
Although the TDA8551's unique push-button, single-pin, digitalvolume control is used as a stand-alone device, it can also be drivenfrom a digital I/O port in microcontroller-based equipment.Additionally, a second control input allows the TDA8551 to be muted orplaced into a low-power standby mode, helping to save powerconsumption in battery powered systems.
The TDA8551's total harmonic distortion, typically better than0.15 percent at 0.5-W output, along with more than 50-dB rejection of supplyrail ripple and freedom from switch-on/off noise, all contribute toexcellent audio quality.
Short-circuit proof outputs, plus built-in electrostatic dischargeprotection and thermal overload protection, ensure excellentreliability. The TDA8551's excellent EMC performance means that noadditional shielding is required, even when it is used inside RFequipment such as mobile phones.
The TDA8551 is available now in either an 8-lead, small-outline,surface-mount, or DIP package and is priced at approximately $0.81 inquantities of 10,000 and $0.65 in quantities of 100,000.
(800) 447-1500 ext. 1478.
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