AD8278

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 A, 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 RoHcompliant. 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 commonmode 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 = 1/2), making the amplifer ideal for single-supply applications that require a high commonmode voltage range. The internal resistors and ESD circuitry at the inputs also provide overvoltage protection to the op amp.

The features of AD8278 can be summarized as (1)wide input range beyond supplies; (2)rugged input overvoltage protection; (3)low supply current: 200 A maximum (per amplifier); (4)low power dissipation: 0.5 mW at V= 2.5 V; (5)bandwidth: 1 MHz (G = 1/2); (6)CMRR: 80 dB minimum, dc to 20 kHz (G = -, B Grade); (7)low offset voltage drift: ±1 V/°C maximum (B Grade); (8)low gain drift: 1 ppm/°C maximum (B Grade); (9)enhanced slew rate: 1.4 V/s; (10)wide power supply range single supply: 2 V to 36 V/ dual supplies: ±2 V to ±18 V; (11)8-lead SOIC, 14-lead SOIC, and 8-lead MSOP packages.

The absolute maximum ratings of AD8278 are (1)supply voltage: ±18 V; (2)maximum voltage at any input pin: -Vs+ 40 V; (3)minimum voltage at any input pin: +Vs-40 V; (4)storage temperature range: -65°C to +150°C; (5)specified temperature range: -40°C to +85°C; (6)package glass transition temperature (TG): 150°C.