AD8628ARZ-REEL7

This amplifier has ultralow offset, drift, and bias current. The AD8628/AD8629/AD8630 are wide bandwidth auto - zero amplifiers featuring rail - to - rail input and output swing and low noise. Operation is fully specified from 2.7V to 5V single supply (±1.35V to ±2.5V dual supply). The AD8628/AD8629/AD8630 provide benefits previously found only in expensive auto - zeroing or chopper - stabilized amplifiers. Using Analog Devices, Inc., topology, these zerodrift amplifiers combine low cost with high accuracy and low noise. No external capacitor is required. In addition, the AD8628/ AD8629/AD8630 greatly reduce the digital switching noise found in most chopper - stabilized amplifiers. With an offset voltage of only 1μV, drift of less than 0.005μV/°C, and noise of only 0.5μV p - p (0Hz to 10Hz), the AD8628/ AD8629/AD8630 are suited for applications where error sources cannot be tolerated. Position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature range. Many systems can take advantage of the rail - to - rail input and output swings provided by the AD8628/AD8629/AD8630 to reduce input biasing complexity and maximize SNR.

Applications

• Automotive sensors
• Pressure and position sensors
• Strain gage amplifiers
• Medical instrumentation
• Thermocouple amplifiers
• Precision current sensing
• Photodiode amplifiers

Key features

• Lowest auto - zero amplifier noise
• Low offset voltage: 1μV
• Input offset drift: 0.002μV/°C
• Rail - to - rail input and output swing
• 5 V single - supply operation
• High gain, CMRR, and PSRR: 130 dB
• Very low input bias current: 100 pA maximum
• Low supply current: 1.0mA
• Overload recovery time: 50μs
• No external components required
• Qualified for automotive applications