Low Power, Wide Supply Range,
Low Cost Difference Amplifiers, G = ½, 2
AD8278/AD8279
FEATURES FUNCTIONAL BLOCK DIAGRAMS
+VS 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 8-lead MSOP packages 7 AD8278 +IN 3 20kΩ 40kΩ 20kΩ 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. OUT 1 REF Figure 1. AD8278
+VS
11 –INA +INA 3 –INB 6 40kΩ 20kΩ 40kΩ 20kΩ 40kΩ 20kΩ +INB 5 40kΩ 20kΩ 12 SENSEA 13 OUTA 14 REFA 10 SENSEB 9 OUTB 8 REFB 4 –VS 08308-058 AD8279 …