Texas Instruments (TI) introduced an audio operational amplifier (op-amp) that sets the latest standard in audio performance. 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 new 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-analog converters (DACs). 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, 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.
Optimized for high-fidelity portable audio devices, the OPA1622 consumes low quiescent current of 2.6-mA per channel and delivers high linear output current of 80 mARMS in a small, 3-mm × 3-mm dual flat no-lead (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 low-dropout regulator (LDO), saving board space without compromising audio 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 innovative pinout improves printed circuit board (PCB) layout and enables exceptional distortion performance at high output power. A unique 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 designers verify board-level signal-integrity requirements. A TI Designs – Precision reference design for voltage-output audio DACs will be available in 1Q16 to speed time to market for OPA1622-based headphone amplifier designs.
The OPA1622 is available in a 3-mm × 3-mm DFN package for US $2.90 in 1,000-unit quantities.
To create a high-performance audio signal path, system designers can combine the OPA1622 with TI’s PCM1794A Burr-Brown Audio stereo digital-to-analog converter (DAC). Other companion devices include TI’s TPS65133 and TPS65132 split-rail converters, which supply power in portable audio applications.
TI will demonstrate the new OPA1622 at CES 2016.