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.
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