Analog Devices' Instrumentation Amplifier Combines Low Noise, Power and Distortion for Precision Signal Detection in Industrial Applications



Analog Devices, Inc. (ADI) today introduced an ultra-low noise, low-power low-distortion instrumentation amplifier (in amp) for the precision measurement of extremely small signals present in noisy industrial operating environments. Tracing its lineage back to ADI's market-leading AD620 low-drift, low-power in amp, the new high-bandwidth AD8429 in amp is one of the fastest in amps on the market with a current feedback architecture that offers 15 MHz (G=1) bandwidth and a 22-V/?s slew rate, which is 30 percent higher than competing in amps. With a low distortion of -130-dB, the AD8429 is robust enough for applications that demand reduced size, power and distortion levels, such as healthcare instrumentation, precision data acquisition equipment and industrial vibration analysis. With 1-nV/?Hz input noise and 45-nV/?Hz output noise, the AD8429 operates across the extended industrial temperature range of -40?C to 125?C. Input bias current of 50-nA is orders of magnitude lower than the 12,000-nA bias current of other in amps, while the 100-?V input offset voltage of the AD8429 is two to three times lower. The AD8429 has a 90-dB CMRR (common-mode rejection ratio) when operating in dc mode and an 80-dB CMRR in ac mode, which prevents unwanted signals from corrupting smaller signal acquisition. The CMRR increases with the gain to provide high signal rejection when it is needed most, and ADI's high-performance pin configuration allows the AD8429 to reliably maintain high CMRR at frequencies well beyond those of typical instrumentation amplifiers. This high-level of precision performance is available in a 4-mm x 5-mm, JEDEC compliant, plastic SOIC_N (small outline package, narrow body) package. The AD8429 provides analog design engineers with a versatile, flexible in amp featuring a ±4-V to ±18-V dual power supply. Gain is set from 1 to 10,000 with a single resistor, and a reference pin allows the user to offset the output voltage. This feature can be useful to shift the output level when interfacing to a single-supply signal chain. About Analog Devices Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the most long-standing, high-growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronics equipment. Celebrating over 40 years as a leading global manufacturer of high-performance integrated circuits used in analog and digital signal processing applications, Analog Devices, Inc. is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. It has manufacturing facilities in Massachusetts, California, North Carolina, Ireland, and the Philippines. Analog Devices' common stock is listed on the New York Stock Exchange under the ticker "ADI" and is included in the S&P 500 Index.