The OPA1622 is the newest addition to the company's Burr-Brown Audio line and is the next generation of the widely adopted OPA1612. The OPA1622 delivers high output power of up to 150 mW and extremely low distortion of -135 dB at 10 mW, enabling the highest performance for professional audio equipment. The OPA1622's small size, low power consumption and low distortion can deliver high-fidelity audio in portable devices such as headphone amplifiers, smartphones, tablets and USB audio digital-to-analogue converters (DACs).The OPA1622 op amp, TI adds;
- Pushes the boundaries of audio quality: 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 – a claimed 12 times better than the nearest competitor. It also 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 professional audio applications.
- Optimised for high-fidelity portable audio devices: Consumes quiescent current of 2.6 mA per channel and delivers high linear output current of 80 mA rms in a 3 x 3-mm dual flat no-lead (DFN) package. Increased power-supply rejection ratio (PSRR) of -97/-123 dB at 20 kHz enables low distortion from switching power supplies with no low-dropout regulator (LDO), saving board space without compromising audio performance.
- Unique pinout simplifies design and improves distortion performance: The OPA1622's ground-referenced enable pin is directly controllable from the low-power processor's general-purpose input/output (GPIO) pins without level-shifting circuits. Its pinout improves printed circuit board (PCB) layout and enables exceptional distortion performance at high output power.
- Eliminates audible clicks and pops: An enable-circuitry design limits output transients when the OPA1622 is transitioning into or out of shutdown mode.
A TINA-TI SPICE macromodel is available for the OPA1622 to help designers verify board-level signal-integrity requirements. A TI Designs – Precision reference design for voltage-output audio DACs will be available in