Date: 10/09/2010
High voltage zero-drift bi-directional current sense amplifier from Analog Devices
Analog Devices (ADI) has released a high-voltage amplifier called AD8207 for current sensing applications. According to ADI this device meets the robust performance and quality requirements for motor and solenoid control in industrial and automotive applications. The AD8207 is a zero-drift, high-voltage, bi-directional current sense amplifier, which feature a temperature accuracy specified at a maximum of 1 ?V/°C offset drift over the automotive temperature range of -40 degrees C to 125 degrees C.
The AD8207 can amplify small differential current shunt voltages in the presence of rapidly changing common-mode voltages. The new current sense amplifier rejects PWM (pulse width modulation) input common-mode voltages. This 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.
The key features of AD8207 include:
1) 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
2) Offset drift is typically less than 500 nV/ degrees C and gain drift is below 10 ppm/ degrees C.
3) 80 dB CMRR (common-mode rejection ratio) from dc to 100 kHz.
4) Meets AEC-Q100 standards. Tested for EMI (electromagnetic interference) compliance.
5) Adjustable output offset is effective for bi-directional current measurements.
”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.”
Availability, Pricing and Complementary Products
Product Sample
Availability Price
Each Per
1K Temperature
Range Packaging
AD8207WBRZ Now $1.99 -40°C to +125°C 8-lead SOIC
AD8207WBRZ-RL Now $1.99 -40°C to +125°C 8-lead SOIC,
13”Tape/Reel
AD8207WBRZ-R7 Now $1.99 -40°C to +125°C 8-lead SOIC,
7” Tape/Reel
The companion products suggested by ADI for AD8207 are AD8214- high-voltage threshold detector, AD2S80A- variable resolution resolver-to-digital converter and the AD2S44 14-bit, dual-channel synchro/resolver-to-digital converter.