Data Sheet

AD8628/AD8629/AD8630

Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier

Rev. M

DOCUMENT FEEDBACK

TECHNICAL SUPPORT

Information furnished by Analog Devices is believed to be accurate and reliable "as is". However, no responsibility is assumed by Analog

Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to

change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

FEATURES

►

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

APPLICATIONS

►

Automotive sensors

►

Pressure and position sensors

►

Strain gage amplifiers

►

Medical instrumentation

►

Thermocouple amplifiers

►

Precision current sensing

►

Photodiode amplifiers

PIN CONFIGURATIONS

Figure 1. 5-Lead TSOT (UJ-5) and 5-Lead SOT-23 (RJ-5)

Figure 2. 8-Lead SOIC_N (R-8)

Figure 3. 8-Lead SOIC_N (R-8) and 8-Lead MSOP (RM-8)

Figure 4. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)

GENERAL DESCRIPTION

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 2.7 V to 5 V single supply (±1.35 V to ±2.5 V

dual supply).

The AD8628/AD8629/AD8630 provide benefits previously found on-

ly in expensive auto-zeroing or chopper-stabilized amplifiers. Using

Analog Devices, Inc., topology, these zero-drift 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 amplifi-

ers.

With an offset voltage of only 1 µV, drift of less than 0.005 μV/°C,

and noise of only 0.5 µV p-p (0.1 Hz to 10 Hz), the AD8628/

AD8629/AD8630 are suited for applications where error sources

cannot be tolerated. Position and pressure sensors, medical equip-

ment, 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.

The AD8628/AD8629/AD8630 are specified for the extended indus-

trial temperature range (−40°C to +125°C). The AD8628 is available

in tiny 5-lead TSOT, 5-lead SOT-23, and 8-lead narrow SOIC plastic

packages. The AD8629 is available in the standard 8-lead narrow

SOIC and MSOP plastic packages. The AD8630 quad amplifier

is available in 14-lead narrow SOIC and 14-lead TSSOP plastic

packages. See the Ordering Guide section for automotive grades.