Op amps set new performance and power benchmarks for pro audio and prosumer audio systems

October 24, 2012 // By Paul Buckley
Texas Instruments Incorporated has introduced two bipolar-input audio operational amplifiers (op amps) that provide unmatched noise, distortion and bandwidth performance while dissipating a mere 1.5 mA.

The power-efficient, dual-channel OPA1662 and quad-channel OPA1664 enable system designers to develop the next generation of professional and prosumer audio equipment capable of producing crisp, clean ‘true to the original recording’ sound quality. These op amps are targeted at USB and FireWire audio systems, analog and digital mixers, portable recording systems, and other applications that require the highest noise performance combined with low power consumption.

The OPA1662 and OPA1664 offer a low 3.3-nV/rt Hz noise density with an ultra-low total harmonic distortion plus nose of 0.00006 percent at 1 kHz which enables the design of much higher performance audio equipment than previously thought possible.

The device’s low quiescent current of 1.5 mA per channel allows designers to stay within system power budgets while offering unmatched sound reproduction.  A wide gain bandwidth of 22 MHz and slew rate of 17 V/us providse higher signal integrity and faster response to a wider range of input signal frequencies.

The operating range of +/-1.5 V to +/-18 V or +3 V to +36 V provides excellent dynamic performance over a wide choice of loads.

System designers can build an audio signal path by combining the OPA1662 or OPA1664 with the PCM1792A 24-bit, 192-kHz sampling, stereo audio digital-to-analog converter (DAC).

The OPAMPEVM universal op amp evaluation module (EVM) is available to accelerate the development of audio equipment using the OPA1662 and OPA1664 for a suggested retail price of $5. The Active Filter Designer tool can help system designers implement an op amp filter design. TINA-TI SPICE models and reference designs are also available now for the OPA1662 and OPA1664 op amps.

Availability and Pricing

The dual-channel OPA1662 is available now in SO-8 and MSOP-8 packages for a suggested retail price of US$0.95 in 1,000-unit quantities. The quad-channel OPA1664 is available in SO-14 and TSSOP-14 packages for a suggested retail price of US$1.45 in 1,000-unit quantities.

More information about the OPA1662 op amps at