Analog Devices, Inc. (ADI), a world leader in semiconductors for mixed-signal processing applications and leading supplier of signal conditioning technology, introduced the industry’s most accurate high-voltage amplifier for current sensing applications. The AD8207 zero-drift, high-voltage, bi-directional current sense amplifier meets the robust performance and quality requirements for motor and solenoid control in industrial and automotive applications. The product features breakthrough temperature accuracy specified at a maximum of 1 µV/°C offset drift over the automotive temperature range of -40 degrees C to 125 degrees C — a 5-fold improvement over competing devices.
The unique architecture of the AD8207 accurately amplifies small differential current shunt voltages in the presence of rapidly changing common-mode voltages ranging from -4 V to 65 V. The new current sense amplifier rejects PWM (pulse width modulation) input common-mode voltages, while the zero-drift architecture yields the lowest offset drift performance available today.
“For customers who need automotive-grade performance, the AD8207 is the only zero-drift current sense amplifier with high bandwidth and a common-mode voltage range that extends below ground,” said Steve Sockolov, director, Precision Signal Conditioning Group, Analog Devices. “The industry’s lowest guaranteed offset drift, coupled with greater than 150-kHz bandwidth, and maximum 0.3 percent gain error, means the AD8207 achieves best-in-class accuracy without requiring the larger PCB layout and multi-temperature production calibration of discrete alternatives.”
AD8207 Current Sense Amplifier Key Features and Benefits
- Provides low-drift current measurement for closed-loop motor control in safety critical automotive applications, such as electric power steering and advanced braking
- Enables accurate current measurements to control solenoids and actuators in industrial applications
- Input common-mode voltage range:
- -4 V to +65 V operating (5 V supply)
- -4 V to +35 V operating (3.3 V supply)
- -25 V to +75 V input survival
- Offset drift is typically less than 500 nV/ degrees C and gain drift is below 10 ppm/ degrees C
- 80 dB CMRR (common-mode rejection ratio) from dc to 100 kHz
- Meets AEC-Q100 standards
- Tested for EMI (electromagnetic interference) compliance
- Adjustable output offset is effective for bi-directional current measurements
As part of a signal chain, the AD8207 zero drift, high-voltage, bi-directional current sense amplifier works well with the AD8214 high-voltage threshold detector and ADI’s resolver-to-digital converters, such as the AD2S80A variable resolution resolver-to-digital converter and the AD2S44 14-bit, dual-channel synchro/resolver-to-digital converter.
About Analog Devices
Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data-conversion and signal-conditioning technologies, Analog Devices serves over 60,000 customers, representing virtually all types of electronic 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 is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. 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.