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ST op amps deliver very-low noise, ultra-low power consumption

Posted: 27 Jul 2005 ?? ?Print Version ?Bookmark and Share


STMicroelectronics launched a family of high-speed operational amplifiers featuring very-low noise and ultra-low power consumption, designed for logic analyzers, oscilloscopes, video drivers, imaging systems and battery-powered instrumentation.

Using a high-speed BiCMOS technology and current-feedback architecture, this new family of op amps are produced in an advanced high volume BiCMOS process and offer exceptional performance at low cost, said the company.

Of the current three devices in the family, one focuses on low-current and high-bandwidth applications while the others target very-low-noise performance. The TSH310 requires 40?A of quiescent current and achieves 130MHz bandwidth, which is a measure of the maximum small-signal speed that can be handled effectively, and 115V/?s slew rate, which is a measure of the ability of a circuit to pass a signal of high amplitude and high frequency, explained ST. The TSH310, which offers low power consumption, is available in the tiny SOT-23 package, suitable for compact portable applications, as well as an SO-8 package. Meanwhile, the TSH330 and TSH350 provide wide bandwidth and high slew rateup to 1.1GHz and 1800V/?s in the TSH330 - with noise (Equivalent Input Noise Voltage) as low as 1.3nV/sqrtHz.

Reducing equipment power consumption has become a primary goal for designers and the TSH310 is particularly suitable for high-speed battery-powered products requiring high dynamic performance. The op amp's typically low quiescent current is guaranteed to be <470?A by device testing, and input noise is typically 7.5nv/sqrtHz. The output stage is optimized for driving high-speed ADC inputs, and has a linearity (SFDR) of -87dBc for F=1MHz, -55dBc for F=10MHz (2Vp-p, 1-kiloohm load).

For high-end equipment demanding very wide bandwidth and excellent noise performance, the TSH330 provides unity-gain bandwidth of 1.1GHz, with 16mA quiescent current and typically 1.3nV/sqrtHz of input voltage noise. It demonstrates 0.1dB gain flatness up to 160MHz at a gain of 2, and with the output stage optimized for driving 100-ohm video or instrumentation lines, SFDR is -78dBc for F=10MHz, and -73dBc for F=20MHz (2Vp-p, 100-ohm load).

The TSH350 features a 410MHz bandwidth, 940V/?s slew rate and 4.1mA quiescent current. Input noise is held low at 1.5nV/sqrtHz. The output stage is also intended for driving 100-ohm loads and provides a minimum 2.8Vp-p swing for a 5V supply voltage. Distortion is specified as typically -66dBc for F=10MHz and an output swing of 1Vp-p into a 100-ohm load.

All of the new amplifiers are designed for operation on a 5V power supply, and are characterized for the -40C to 85C temperature range. They are available in an 8-pin SO-8 plastic package with standard pin-out, in both tube and tape-and-reel. The TSH310 is also available in 5-pin SOT-23.

Available in production quantities, the TSH310, TSH330 and TSH350 are priced at $1.30, $1.40, and $1.20 in 5,000-piece quantities, respectively.

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