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Trio of low-power difference amplifiers feature fast slew rates, reduce board space

Analog Devices, Inc., has unveiled three new low-power difference amplifiers as small as 4.9 mm x 3 mm and featuring slew rates up to 10 times faster than competing products.

Designed for high-performance, power-critical applications, the AD8276, AD8277 and AD8278 difference amplifiers are half the size of competing devices and much smaller than discrete alternatives consisting of resistor arrays and operational amplifiers. The amplifiers also eliminate the added expense and design overhead associated with complex peripheral protection circuitry.

The slew rate of 1.1 V/us (volts per microsecond) combined with an input range of two times the power supply make the AD827x products well suited for robust voltage and current sensing in process-control, motor-control, and power-management applications.

The AD827x low-power difference amplifiers combine the benefits of a wide supply range of 2.5 V to 36 V and low power with a 550-kHz bandwidth that is two times faster than other low-power difference amplifiers. In addition, these difference amplifiers feature 220-uA maximum quiescent current with an 86-dB CMRR (common-mode rejection ratio) that is 10-dB greater than competing devices. AD827x difference amplifiers reject external interferences in low-power systems without increasing system power dissipation. Response time includes a 1.1-V/uS slew rate and 15-uS settling time to 0.01 percent. The settling time is more than five times faster than other amplifiers in their class and ensures shorter propagation delays in control loops. On-chip resistors are laser-trimmed for accurate gain, low gain drift, and high common-mode rejection.

The AD827x difference amplifiers work well with other low-power components, such as ADI's ADCs (analog-to-digital converters) including the AD7450 12-bit SAR ADC and AD7982 18-bit PulSAR ADC, as well as low-power operational amplifiers, including the AD8500 precision CMOS op amp, AD8538 auto-zero op amp, and AD8603 rail-to-rail input-output op amp.

Availability and Pricing

The devices are available now. The AD8276 in 8-lead SOIC and MSOP packages is priced at $0.95 each per 1,000. The AD8277 in a 14-lead SOIC package is priced at $1.60 each per 1,000. The AD8278 in a 8-lead SOIC and MSOP packages is priced at $0.95 each per 1,000.

Datasheet: AD8276

Datasheet: AD8277

Datasheet: AD8278

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