AD8628

Part: AD8628ARZ (AD8628/AD8629/AD8630 family) — Analog Devices

Type: Zero-Drift, Rail-to-Rail Input/Output Operational Amplifier

Description: Single-supply (2.7–5 V) zero-drift op amp with 1 μV typical offset voltage, 0.002 μV/°C typical offset drift, 2.5 MHz gain bandwidth product and 0.5 μV p-p noise (0.1 Hz to 10 Hz).

Operating Conditions:

• Supply voltage: 2.7–5 V single supply (±1.35 V to ±2.5 V dual supply)
• Operating temperature: -40 to +125 °C
• Input voltage range: 0 to VS (V)

Absolute Maximum Ratings:

• Max supply voltage: 6 V
• Input voltage: GND - 0.3 V to VS + 0.3 V
• Differential input voltage: ±5.0 V
• Output short-circuit duration to GND: indefinite
• Storage temperature: -65 to +150 °C
• Junction temperature: -65 to +150 °C
• Lead temperature (soldering, 60 sec): 300 °C

Key Specs:

• Offset voltage (VS = 5 V, TA = 25 °C): 1 μV typ; 5 μV max (10 μV max over -40 to +125 °C)
• Offset voltage drift: 0.002 μV/°C typ, 0.02 μV/°C max (-40 to +125 °C)
• Input bias current (AD8628/AD8629): 30 pA typ, 100 pA max at 25 °C
• CMRR (VCM = 0 to 5 V): 140 dB typ, 120 dB min; 115 dB min over temperature
• Large-signal gain (RL = 10 kΩ): 145 dB typ, 125 dB min at VS = 5 V
• PSRR (VS = 2.7 to 5.5 V): 130 dB typ, 115 dB min
• Supply current per amplifier (VS = 5 V, VO = VS/2): 0.85 mA typ, 1.1 mA max at 25 °C; 1.2 mA max over temperature
• Gain bandwidth product: 2.5 MHz at 5 V; slew rate 1.0 V/μs (RL = 10 kΩ)
• Voltage noise density: 22 nV/√Hz at 1 kHz; current noise density 5 fA/√Hz at 10 Hz
• Output swing (VS = 5 V, RL = 10 kΩ): VOH 4.95 V min, VOL 20 mV max
• Overload recovery time: 0.05 ms typ

Features:

• Lowest auto-zero amplifier noise
• Rail-to-rail input and output swing
• No external components required
• High gain, CMRR and PSRR (130 dB)
• Overload recovery time of 50 μs
• Qualified for automotive applications (see Ordering Guide)

Applications:

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

Package:

• AD8628: 5-lead TSOT, 5-lead SOT-23, 8-lead narrow SOIC (R-8)
• AD8629: 8-lead narrow SOIC, 8-lead MSOP
• AD8630: 14-lead narrow SOIC, 14-lead TSSOP

Lowest auto-zero amplifier noise Low offset voltage: 1 μV Input offset drift: 0.002 μV/°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: 1.0 mA Overload recovery time: 50 μs No external components required Qualified for automotive applications

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

VS = 5.0 V, VCM = 2.5 V , TA = 25°C, unless otherwise noted.

Table 1.

θJA is specified for worst-case conditions, that is, θJA is specified for the device soldered in a circuit board for surface-mount packages. This was measured using a standard two-layer board.