Texas Instruments recently introduced the OPA1622 audio operational amplifier (op-amp), which is the latest addition to the company’s Burr-Brown Audio line. The OPA1622 delivers high output power of up to 150 mW and extremely low distortion of –135 dB at 10 mW.
TI introduces the industry’s highest-performance audio operational amplifier (PRNewsFoto/Texas Instruments)
The compact OPA1622’s low power consumption and low distortion can deliver high-fidelity audio in portable devices such as headphone amplifiers and smartphones. Headphone amplifier designers can take advantage of its low total harmonic distortion (THD) of –135 dB at 10-mW output power into a 32-Ω load. In addition, the OPA1622 delivers maximum output power of up to 150 mW before clipping while maintaining the lowest THD and noise (THD+N), providing a clean signal path for pro audio applications.
The OPA1622 consumes low quiescent current of 2.6-mA per channel and delivers high linear output current of 80 mARMS in a 3-mm × 3-mm DFN package. Additionally, the increased power-supply rejection ratio (PSRR) of –97/–123 dB at 20 kHz enables low distortion from switching power supplies with no LDO, thereby saving board space without compromising audio performance.
The OPA1622’s ground-referenced enable pin is directly controllable from the low-power GPIO pins without level-shifting circuits. Its pinout improves PCB layout and enables exceptional distortion performance at high output power. An enable-circuitry design limits output transients when the OPA1622 is transitioning into or out of shutdown mode, effectively eliminating audible clicks and pops.
A TINA-TI SPICE macromodel is available for the OPA1622 to help verify board-level signal-integrity requirements. The OPA1622 is available in a 3-mm × 3-mm DFN package $2.90 in 1,000-unit quantities.
Source: Texas Instruments
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