Precision 36V Amplifiers with Low Power and Small Size

21st November 2006

ES Admin

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Texas Instruments has introduced two precision operational amplifiers that combine ultra-low noise with lower power, smaller package size and higher bandwidth than competitive 36-V amplifiers. The OPA211 and OPA827 enable breakthrough performance for test and measurement, instrumentation, imaging, medical, audio and process control applications. These are the first devices developed using TI's groundbreaking BiCom3HV complementary bipolar 36-V silicon germanium (SiGe) process.

The OPA211 and OPA827 represent a new class of precision amplifiers and demonstrate TI's commitment to the high-voltage industrial market, said Art George, senior vice president of TI's high-performance analog business. These new amplifiers deliver extremely high accuracy with
significant improvements in power consumption, bandwidth and package size characteristics, which will enable next-generation performance in industrial applications.

The OPA211 is a bipolar-input operational amplifier that achieves 1.1 nV/rtHz voltage noise and 80 MHz gain bandwidth product (GBW) with a supply current of only 3.6 mA. The device provides 100 uV offset
voltage, 0.2 uV/degC offset voltage drift and less than 1 us settling time for driving precision analog-to-digital converters in data acquisition systems. It also offers rail-to-rail output swing, which
enhances dynamic range.

The OPA211 operates over a +/-2.25 V to +/-18 V supply range and is available in MSOP-8 or DFN-8 packages. The 3mm x 3mm DFN package requires about 1/3 the area of a standard SO-8 package. Bipolar op amps excel in limiting errors related to offset voltage and are used in applications where the source impedance is low.

The OPA827 is a JFET-input operational amplifier that combines outstanding DC precision with excellent AC performance. DC characteristics include 4.5 nV/rtHz voltage noise, 250 uV offset
voltage, 1 uV/degC offset voltage drift and 400 nVpp frequency noise. AC specifications include 18 MHz GBW, 22 V/µs slew rate and 0.0004 percent total harmonic distortion (THD) at 1 kHz.
The OPA827 operates over a +/-4 V to +/-18 V supply range with a supply current of only 4.5 mA. The MSOP-8 package represents a 50 percent reduction compared to SO-8 packages. JFET op amps offer very low bias current and are suited for applications where source impedance is high.