Integrated Silicon Solution, Inc. continued to grow its audio amplifier portfolio with the release of two high performance Class-D power amplifiers. The IS31AP2111 and IS31AP2121 are the first I2S Digital Input Class D amplifiers to address the needs of medium-power multimedia applications such as Bluetooth speakers, sound bars, LCD projectors, HDTVs, media docking stations and radio equipment.
Audio designs employing the IS31AP2111 or IS31AP2121 will benefit from an I2S (Inter-IC Sound) serial bus interface. The I2S interface transfers audio signals in digital format to maintain maximum audio quality when distributed between audio devices. The I2S bus separates clock and serial data signals, resulting in significantly lower jitter and higher noise immunity than analog audio amplifiers.
"ISSI's new I2S input interface devices enable system designers to deliver what consumers have come to expect from high quality personal and home audio solutions. These devices incorporate a host of features to enhance audio quality and reliability at a low cost by simplifying the audio signal chain," stated Ven Shan, VP of Analog Products at ISSI. "The new products will address medium- to high-power audio amplifier needs in consumer, industrial and aftermarket automotive applications."
The IS31AP2111 and IS31AP2121 are 20-Watt power amplifiers with advanced audio processing capabilities, such as 3D surround sound, audio mixing, 20 band equalizer, dynamic range and volume control -- all programmable via an I2C interface. Both devices operate in a BTL (Bridge-Tied Load) mode, which efficiently doubles the available power to the speaker load. In BTL operation, there is no need for a DC blocking capacitor between the amplifier and speaker, which saves cost and space, all without power loss even at low frequencies. In addition, the IS31AP2121 supports 2.1 mode and Parallel Bridge-Tied Load (PBTL) to efficiently deliver even more power (40W) to a 4 ohm speaker load.
The IS31AP2111 and IS31AP2121 have advanced built-in controls for seamless audio operation. Appropriate control signals suppress pop sounds during initial power on/off, power up/down and mute, while also offering a volume fade-in/fade-out design for power down and mute functions. The 3D virtual surround sound technology provides greater separation and depth of voice quality for stereo signals. The devices also have built-in protection circuits including thermal, short-circuit and under-voltage for reliable and robust operation.
The IS31AP2111 is available in a thermally enhanced 24 pin eTSSOP type package while the IS31AP2121 is available in a thermally enhanced 48 pin eLQFP type package. The IS31AP2111 is priced at $1.20 each and the IS31AP2121 is priced at $1.30 each in 1,000 piece quantities.
