●Product Details
●The AD8278 and AD8279 are general-purpose difference amplifiers intended for precision signal conditioning in power critical applications that require both high performance and low power. The AD8278 and AD8279 provide exceptional common-mode rejection ratio (80 dB) and high bandwidth while amplifying input signals that are well beyond the supply rails. The on-chip resistors are laser trimmed for excellent gain accuracy and high CMRR. They also have extremely low gain drift vs. temperature.
●The common-mode range of the amplifier extends to almost triple the supply voltage (for G = ½), making the amplifer ideal for single-supply applications that require a high common-mode voltage range. The internal resistors and ESD circuitry at the inputs also provide overvoltage protection to the op amp.
●The AD8278 and AD8279 can be used as difference amplifiers with G = ½ or G = 2. They can also be connected in a high precision, single-ended configuration for non inverting and inverting gains of −½, −2, +3, +2, +1½, +1, or +½. The AD8278 and AD8279 provide an integrated precision solution that has a smaller size, lower cost, and better performance than a discrete alternative.
●The AD8278 and AD8279 operate on single supplies (2.0 V to 36 V) or dual supplies (±2 V to ±18 V). The maximum quiescent supply current is 200 μA, which is ideal for battery-operated and portable systems. For unity-gain difference amplifiers with similar performance, refer to the AD8276 and AD8277 data sheets.
●The AD8278 is available in the space-saving 8-lead MSOP and SOIC packages, and the AD8279 is offered in a 14-lead SOIC package. Both are specified for performance over the industrial temperature range of −40°C to +85°C and are fully RoHS compliant.
●Applications
● Voltage measurement and monitoring
● Current measurement and monitoring
● Instrumentation amplifier building block
● Portable, battery-powered equipment
● Test and measurement
●### Features and Benefits
● Wide input range beyond supplies
● Rugged input overvoltage protection
● Low supply current: 200 μA maximum (per amplifier)
● Low power dissipation:
●0.5 mW at VS = 2.5 V
● Bandwidth: 1 MHz (G = ½)
● CMRR: 80 dB minimum,
●dc to 20 kHz (G = ½, B Grade)
● Low offset voltage drift: ±1 μV/°C maximum (B Grade)
● Low gain drift: 1 ppm/°C maximum (B Grade)
● Enhanced slew rate: 1.4 V/μs
● Wide power supply range
●Single supply: 2 V to 36 V
●Dual supplies: ±2 V to ±18 V
● 8-lead SOIC, 14-lead SOIC, and MSOP packages
