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Op amp preserves SNR

Geneva — STMicroelectronics' ultra low noise, wide bandwidth operational amplifier (op amp) is intended for high end industrial, medical and instrumentation applications.

STMicro claims that the typical noise value (equivalent input noise voltage) of 0.65 nV/√ Hz for the TSH300 op amp is the lowest in the industry for a wide band amplifier in the tiny SOT23-5L package, or in SO-8.

The TSH300 op amp features input noise of 0.65 nV/√ Hz, coupled with a bandwidth of 200 MHz at a gain of 5 Volts/V (GBP=1 GHz). With its slew rate of 230 volts/us and very good linearity (SFDR of 55 dBc, measured with a 10-MHz output sine wave of 2 V peak to peak into a 100-ohm load), the TSH300 is a perfect component in analog-to-digital (A/D) converter interface applications, the company said.

Its ultra low noise performance and wide bandwidth have been achieved using a very fast 0.25-micron complementary bipolar manufacturing process. The TSH300 is suited for use in systems such as sensor preamplifiers and ultrasound imaging, where very small and very fast signals need to be amplified with high gain, without adding significant noise and while preserving a very good signal-to-noise ratio (SNR).

The amplifier is stable for gains greater than 5, enabling it to be used at high gain values for small amplitude input signals. Its topology allows it to be used in inverting mode with excellent frequency response, providing good performance when combining two devices in the differential configuration, according to the company. Voltage feedback architecture allows the use of reactive elements in the feedback loop, as required for many filter topologies. It operates from 4.5 V to 5.5 V on either single or dual supplies.

The TSH300 is specified for operation over the -40°C to +85°C temperature range. The op amp is available now in SO-8 and SOT23-5L packages for $1.50 each for quantities up to 5,000 units. Click here for the TSH300 data sheet.

STMicroelectronics , 1-781-861-2650, www.st.com.

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