AD8629 Zero Drift, Single-Supply, R/R, Input/Output Operational Amplifier

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

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 only 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 amplifiers.

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 Hz to 10 Hz), 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.

The AD8628/AD8629/AD8630 are specified for the extended industrial 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 for automotive grades.

Applications

Data Sheet, Rev. H, 4/2010

Features and Benefits

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

Download AD8629-EP Data Sheet (pdf)
Extended temperature range: −55°C to +125°C
Controlled manufacturing baseline
One assembly/test site
One fabrication site
Enhanced product change notification
Qualification data available on request
V62/15607 DSCC Drawing Number

Amplifiers

SPICE Models

AD8629 SPICE Macro-Model .CIR

Reference Designs

CN0338 Design & Integration Files .ZIP

Data Sheets

Document	note
AD8628/AD8629/AD8630: Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier Data Sheet (Rev. K)	PDF 414 kB
AD8629-EP: Enhanced Product Data sheet AD8629-DSCC: Military Data Sheet	PDF 200.58 K

Application Notes

Document	note
AN-1114: Lowest Noise Zero-Drift Amplifier Has 5.6 nV/√Hz Voltage Noise Density (Rev. B)	PDF 182 kB

Technical Books

Document	note

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD8629ARMZ Production	8 ld MSOP	OTH 50	-40 to 125C	1.74	1.47	Y
AD8629ARMZ-REEL Production	8 ld MSOP	REEL 3000	-40 to 125C	0	1.47	Y
AD8629ARZ Production	8 ld SOIC	OTH 98	-40 to 125C	1.74	1.47	Y
AD8629ARZ-REEL Production	8 ld SOIC	REEL 2500	-40 to 125C	0	1.47	Y
AD8629ARZ-REEL7 Production	8 ld SOIC	REEL 1000	-40 to 125C	0	1.47	Y
AD8629TRZ-EP Production	8 ld SOIC	OTH 98	-55 to 125C	4.52	3.09	Y
AD8629TRZ-EP-R7 Production	SOIC 150 MIL	REEL 1000	-55 to 125C	0	3.09	Y
AD8629WARZ-R7 Production	8 ld SOIC	REEL 1000	-40 to 125C	0	1.84	Y
AD8629WARZ-RL Production	8 ld SOIC	REEL 2500	-40 to 125C	0	1.84	Y

Evaluation Boards

Part Number	Description	Price	RoHS
EVAL-PRAOPAMP-2CPZ	Dual CP-8 lead LFCSP Evaluation Board	20.19	Y
EVAL-PRAOPAMP-2RMZ	Dual RM-8 lead MSOP Evaluation Board	20.19	Y
EVAL-PRAOPAMP-2RZ	Dual R-8 lead SOIC Evaluation Board	20.19	Y