AD8279 Datasheet

• 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

• Voltage measurement and monitoring
• Current measurement and monitoring
• Instrumentation amplifier building block
• Portable, battery-powered equipment
• Test and measurement

The AD8279 are general-purpose difference amplifiers intended for precision signal conditioning in power critical applications that require both high performance and low power. The 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 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 AD8279 provide an integrated precision solution that has a smaller size, lower cost, and better performance than a discrete alternative.

The 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 AD8279 is offered in a 14-lead SOIC package. The AD8279 is specified for performance over the industrial temperature range of −40°C to +85°C and are fully RoHS compliant.