Features: Lowest auto-zero amplifier noise
Low offset voltage: 1 V
Input offset drift: 0.002 V/°C
Rail-to-rail input and output swing
5 V single-supply operation
High gain, CMRR, and PSRR: 120 dB
Very low input bias current: 100 pA max
Low supply current: 1.0 mA
Overload recovery time: 10 s
No external components requiredApplicationAutomotive sensors
Pressure and position sensors
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
Precision current sensing
Photodiode amplifierPinout
SpecificationsParameters Ratings
Supply Voltage 6 V
Input Voltage GND − 0.3 V to VS− + 0.3 V
Differential Input Voltage1 ±5.0 V
Output Short-Circuit Duration to GND Indefinite
Storage Temperature Range
R, RM, RT, UJ Packages−65°C to +150°C
Operating Temperature Range −40°C to +125°C
Junction Temperature Range
R, RM, RT, UJ Packages−65°C to +150°C
Lead Temperature Range 300°C
(Soldering, 60 s)
| -3dB Bandwidth |
2.5MHz |
| Slew Rate |
1V/s |
| Vos |
1V |
| Ib |
30pA |
| Input Noise (nV/rtHz) |
22nV/rtHz |
| Vcc-Vee Supply (V) |
2.7 to 6 |
| Iq per Amplifier |
1.1mA |
| # OpAmps per Pkg |
2 |
| Operating Temp Range |
-40 to +125 |
| Packages |
SOP,SOIC |
DescriptionThis new breed of amplifier has ultralow offset, drift, and bias current. The AD8628/AD8629 are wide bandwidth auto-zero amplifiers featuring rail-to-rail input and output swings and low noise. Operation is fully specified from 2.7 V to 5 V single supply (±1.35 V to ±2.5 V dual supply).
The AD8628/AD8629 provide benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Analog Devices' new topology, these zero-drift amplifiers combine low cost with high accuracy and low noise. (No exter-nal capacitor is required.) In addition, the AD8628/AD8629 greatly reduce the digital switching noise found in most chopper-stabilized amplifiers.
With an offset voltage of only 1 V, drift of less than 0.005 V/°C, and noise of only 0.5 V p-p (0 Hz to 10 Hz), the AD8628/AD8629 are perfectly suited for applications in which 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 to reduce input biasing complexity and maximize SNR.
The AD8628/AD8629 are specified for the extended industrial temperature range (−40°C to +125°C). The AD8628 is available in tiny TSOT-23, SOT-23, and the popular 8-lead narrow SOIC plastic packages. The AD8629 is available in the standard 8-lead narrow SOIC and MSOP plastic packages.
AD8629 Data Sheet
