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TI headphone driver allows sustained dynamic range of >120dB

Posted: 23 Jun 2004 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? ti? tpa6120a2? pcm1792? dsd1792?

Texas Instruments Inc. has introduced the TPA6120A2, a high-fidelity headphone driver that completes an entire audio signal chain for super-audio compact disc (SACD) and DVD audio players and other systems with similar demanding requirements. When matched with the OPA4134 audio operational amplifier (op amp) and the PCM1792 or DSD1792 DAC from TI's Burr-Brown product line, the entire audio chipset maintains a dynamic range >120dB.

The TPA6120A2 is based on current-feedback architecture. Three key advantages make current-feedback amplifiers excellent low distortion audio power amplifiers. First, a 1,300V/?s slew rate prevents odd order distortion anomalies. Together with the slew rate, the high current-on-demand output enables the amplifier to respond quickly and linearly, avoiding any output distortion and unwanted noise. Finally, the gain-independent frequency response maintains the full bandwidth of the amplifier at any gain setting, which keeps excess loop gain from decreasing and causing harmonic distortion.

Superior sound quality from the OPA4134 is derived from its FET input stage and high drive output stage. The FET inputs respond quickly and the output signal can swing to nearly 1V from the supply rails when driving impedances greater than 2 kiloohms. This delivers an ultra-low 0.00008 percent total harmonic distortion (THD) and 8nV/vHz noise floor.

The PCM1792 and DSD1792 D/A converters employ TI's advanced-segment sigma-delta architecture, enabling dynamic range performance of up to132 dB, with improved tolerance to clock jitter. Balanced current outputs provide increased immunity to noise and allow the user to optimize the analog performance with the output filters. Both the PCM1792 and DSD1792 accept 24-bit PCM and 1-bit DSD audio data formats, and features such as digital attenuation, de-emphasis and soft mute can be controlled with SPI or I2C interfaces.

In addition to offering the complete signal chain, TI offers the Aureus family of audio digital signal processors (DSP) to perform the audio processing functions in high-fidelity systems.

The TPA6120A2, OPA4134, PCM1792 and DSD1792 are available now from TI and its authorized distributors. The TPA6120A2 comes in a standard PowerPAD surface mount 20-pin small outline package (SOIC), the OPA4134 in a standard 14-pin dual inline package (DIP) and a standard 14-pin small outline package (SOIC), and the PCM1792 and DSD1792 are available in a standard surface mount 28-pin small shrink outline package (SSOP).

Suggested resale pricing in quantities of 1,000 start at $1.90 for the TPA6120A2, $1.75 for the OPA4134 and $13.65 for the PCM1792 or DSD1792.

- Paul O'Shea


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