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1.8mA op amps support multiple channels

Posted: 17 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:op amp? audio application? JFET?

OPA1641op amp

Texas Instruments Inc. has rolled out a family of JFET-input op amps featuring ultralow noise and distortion to maximize audio system quality and performance.

With a quiescent current of per channel, the OPA1641, OPA1642 and OPA1644 feature 40 percent lower power than the competition. The op amps support the multiple channels pro audio applications require, without increasing power consumption in high-performance audio circuits, such as broadcast studio equipment, analog and digital mixing consoles, and high-end A/V receivers.

FET inputs deliver 40 percent lower input bias current (2pA) than competitive devices, making the OPA1641, OPA1642 and OPA1644 better alternatives for applications requiring high source impedance. In addition, the op amps feature 15 percent lower noise (5nV/root Hz) and distortion (0.00005% at 1kHz) than the competition, maintaining excellent signal-to-noise ratio (SNR), even with high gain levels.

The devices also provide wide supply voltage range of 2.5V to 18V and rail-to-rail output swing that allows increased headroom, which is critical for audio ADC front-ends and DAC post filters, including TI's PCM42xx and PCM17xx devices.

The single-channel OPA1641 is available today in a SO-8 package for $0.95 in 1000-unit quantities. The two-channel OPA1642 is available in a SO-8 or MSOP-8 package for $1.45, and the four-channel OPA1644 can be purchased in a SO-14 or TSSOP-14 package for $1.95.

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