ANALOG DEVICES Low Drift, Low Power Instrumentation Amplifier AD621 FEATURES EASY TO USE Pin-Strappable Gains of 10 & 100 All Errors Specified for Total System Performance Higher Performance than Discrete In-Amp Designs Available in 8-Pin DIP and SOIC Low Power, 1.3 mA max Supply Current Wide Power Supply Range (+2.3 V to +18 V) EXCELLENT DC PERFORMANCE 0.15% max, Total Gain Error +5 ppm/C, Total Gain Drift 125 pV max, Total Offset Voltage 1.0 pV/C max, Offset Voltage Drift LOW NOISE 9nV/VHz, @ 1 kHz, Input Voltage Noise 0.28 pV p-p Noise (0.1 Hz to 10 Hz) EXCELLENT AC SPECIFICATIONS 800 kHz Bandwidth (G = 10), 200 kHz (G = 100) 12 ps Settling Time to 0.01% APPLICATIONS Weigh Scales Transducer Interface & Data Acquisition Systems Industrial Process Controls Battery Powered and Portable Equipment PRODUCT DESCRIPTION The AD621 is an easy to use, low cost, low power, high accu- racy instrumentation amplifier which is ideally suited for a wide range of applications. Its unique combination of high perfor- mance, small size and low power, outperforms discrete in amp implementations. High functionality, low gain errors and low gain drift errors are achieved by the use of internal gain setting resistors. Fixed gains of 10 and 100 can be easily set via external pin strapping. The AD621 is fully specified as a total system, therefore, simplifying the design process. g 8 3-OP-AMP sae Po sane 18,000 yf > = a ADE21A > 3 3 - => Vv TOTAL ERROR, ppm OF FULL SCALE : SUPPLY CURRENT - mA Three Op Amp JA Designs vs. AD621 This is an abridged data sheet. To obtain the moat recent version or complete data sheet, call our fax retrieval system at 1-800-446-6212. REV. A CONNECTION DIAGRAM 8-Pin Plastic Mini-DIP (N), Cerdip (Q) and SOIC (R) Packages VW e-rono0 [1] apeat EE. Vs [2 rs] REF e 8 | G=10/100 TOP VIEW For portable or remote applications, where power dissipation, size and weight are critical, the AD621 features a very low sup- ply current of 1.3 mA max and is packaged in a compact 8-pin SOIC, 8-pin plastic DIP or 8-pin cerdip. The AD62]1 also excels in applications requiring high total accuracy, such as precision data acquisition systems used in weigh scales and transducer interface circuits. Low maximum error specifications including nonlinearity of 10 ppm, gain drift of 5 ppm/C, 50 ,V offset voltage and 0.6 .V/C offset drift (B grade), make possible total system performance at a lower cost than has been previ- ously achieved with discrete designs or with other monolithic instrumentation amplifiers. When operating from high source impedances, as in ECG and blood pressure monitors, the AD621 features the ideal combina- tion of low noise and low input bias currents. Voltage noise is specified as 9 nV\/Hz at 1 kHz and 0.28 2V p-p from 0.1 Hz to 10 Hz. Input current noise is also extremely low at 0.1 pA/A/Hz. The AD621 outperforms FET input devices with an input bias current specification of 1.5 nA max over the full industrial temperature range. j TYPICAL STANDARD BIPOLAR INPUT IN-AMP. 100-uVp-p 3 8 g (0.1 - 10Hz) 3 AD621 SUPERBETA t BIPOLAR INPUT IN-AMP: TOTAL INPUT VOLTAGE NOISE, G 1k 10% 100k 1M 10M 100M SOURCE RESISTANCE - 2 Total Voltage Noise vs. Source Resistance INSTRUMENTATION AMPLIFIERS 10-15AD621 SPECIFICATIONS Gain = 10 (typical @ +25C, Vy = +15 V, and R, = 2 k unless otherwise noted) AD621A AD621B AD621S! Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Units GAIN Gain Error Vour = +10 V 0.15 0.05 0.15 % Nonlinearity Vout = -10 Vio t10V {Rp =2kn 2 10 2 10 2 10 ppmof FS Gain vs. Temperature -15 +5 -15 =5 -1 +5 ppm/C TOTAL VOLTAGE OFFSET Offset (RTT) Vs=+15V 75 250 50 125 75 250 pV over Temperature Vs=+5 Vto+l5S V 400 215 500 BV Average TC Vg= +5 Vtotls V L.0 2.5 0.6 1.5 1.0 2.5 EVPC Offset Referred to the Input vs. Supply (PSR? = | V5 = 2.3 Vto +18 V 195 120 100 120 95 120 dB TOTAL NOISE _ Voltage Noise, (RTI) 1 kHz 13 17 13 17 13 17 aV//Hz RTI 0.1 Hz to 10 Hz 0.55 0.55 0.8 0.55 0.8 BV p-p Current Noise f= 1 kHz 100 100 100 fA//Hz 0.1 Hz-10 Hz 10 10 10 pA pp INPUT CURRENT Vs = 215V Input Bias Current 0.5 2.0 0.5 1.0 0.5 2 nA over Temperature 2.5 1.5 4 nA Average TC 3.0 3.0 8.0 parc Input Offset Current 0.3 1.0 0.3 0.5 0.3 1.0 nA over Temperature 15 0.75 2.0 nA. Average TC 1.5 1.5 8.0 PASC INPUT Input Impedance Differential Loj|2 10/2 10))2 GO|pF Comimon-Mode lolz 10/2 10/2 GQ\pF Input Voltage Range? Vs = 22.3 Vtot5 VI-Vst+ 19 +V5 1.2/-V5 + L9 +Vs5 ~- 1.2/-Vs + 19 +V5 1.2)V over. Temperature Vg+2.1 +V5 1.3]-Vs + 2.1 +Vs - 13/-V5 + 2.4 +Vs5 1.3/V Vg = 25S Vwortl8V |~-Vo+ 19 +Vs - 1.4/-Vs5 + 1.9 +Vs 1.4/-Vs + 1.9 +V, - 1.4|V over Temperature Vet21 +Vz5 - 14]-V, + 2.1 4+V5 1L4{-Vy + 2.3 +V5 Lal Common-Mode Rejection Ratio DC to 60 Hz with 1 kM Source Imbalance [Vey = 0 V to +10 V 193 110 100 110 93 110 dB OUTPUT Output Swing R, = 10 kQ, Vs = 23 Viot5 V|-Vs+ 11 +V5 1.2|-V5 + 1.1 +V5 1.2]-Vs + LL +V5 L.2|V over Temperature Vst 14 +Vg 1.3}-Vs + 1.4 +Vs5 1.3)-Vg + 1.6 +V5 1.3/V Vs = 5 Vto+18V |V.+ 1.2 V5 L4]-Ve + 1.2 +V5 1.4]-Vg5 + 1.2 +V5 L4l over Temperature V5 + 1.6 +Vo L.5}-Vs5 + 1.6 +V5 1.5]-Vg + 2.3 +V5 - L5/V Short Current Circuit +18 +18 +18 mA DYNAMIC RESPONSE Small Signal, 3 dB Bandwidth 800 300 800 kHz Slew Rate 0.75 1.2 0.75 1.2 0.75 12 Vis Settling Time to 0.01% 10 V Step 12 12 12 us REFERENCE INPUT Rw 20 20 20 kQ lw Vint>Vrer = 0 +50 +60 +50 +60 +50 +60 pA Voltage Range ~Vs5 + 1.6 +V5 1.6/-V, + 1.6 +V5 1.6}-V5 + 1.6 +V5 1L6/V Gain to Output 1 + 0.000] 1 + 0.0001 1 + 0.0001 POWER SUPPLY Operating Range +23 +18 +23 +18 42.3 +18 v Quiescent Current Vs = +2.3Vt00+18V 0.9 1.3 0.9 1.3 0.9 1.3 mA over Temperature 11 1.6 la 1.6 1k 1.6 mA TEMPERATURE RANGE For Specified Performance 40 10 +85 ~40 to +85 S5 to +125 C NOTES 'See Analog Devices military data sheet for 883B tested specifications. ?This is defined as the supply range over which PSRR is defined. 3Input Voltage Range = CMV + (Gain x Vpyepr)- Specifications subject to change without notice. 10-16 INSTRUMENTATION AMPLIFIERS REV. AGain = 100 typical @ +25c, , = 15 V, and R, = 2 kO unless otherwise noted) AD621 AD621A AD621B AD621S! Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Units GAIN Gain Error Vout = +10 V 0.15 0.05 0.15 % Nonlinearity Vour = 10 Vto+10V |Ry = 2k 2 10 2 10 2 10 ppm of FS Gain vs. Temperature -1 25 -1 +5 1 +5 ppm/C TOTAL VOLTAGE OFFSET Offset (RTI) Vg=t5V +15 V 35 125 25 50 35 125 uv over Temperature Ve=+5Vto+15V 185 215 225 wv Average TC Vsg= +5 Vitis Vv 0,3 1.0 0.1 0.6 0.3 1.0 BVPC Offset Referred to the Input vs. Supply (PSR)? |V, = #2.3Vto+18V|110 140 120 140 110 140 4B TOTAL NOISE _ Voltage Noise, (RTI 1 kHz 9 13 9 13 9 13 nV/y Hz RTI 0.1 Hz to 10 Hz 0.28 0,28 0.4 0.28 0.4 BY pep Current Noise f= 1kHz 100 100 100 fA Hz 0.1 Hz-10 Hz 10 10 10 pA p-p INPUT CURRENT Vs = +15V Input Bias Current 0.5 2.0 0.5 1.0 0.5 2 nA over Temperature 2.5 15 4 nA Average TC 3.0 3.0 8.0 pArc Input Offset Current 0.3 1.0 0.3 0.5 0.3 1.0 nA over Temperature 1.5 0.75 2.0 nA Average TC 1.5 1.5 8.0 pArc INPUT Input Impedance a Differential 10\\2 10|/2 10}2 GO||pF Common-Mode 10/2 LOi2 102 GQ||pF Input Voltage Range? Vs = 22.3 Vto+5 V|-Vo + 1.9 4V5 1.2/-Vs + 1.9 tVe > 1.2)-Ve + 19 +Vo- 1.2/V over Temperature Vo+2.1 +Vs5 1.3]-V5 + 2.1 +Vs 1.3/-Vg + 2.1 +V5- 1.3/V Vs = 5 Vto+l8 V |-Vy5 41.9 4V5 14] -V5 + 1.9 #V5 14] -5 + 1.9 Vs - 14/V over Temperature V5+ 2.1 +Ve - L4)-V5 4+ 2.1 +V, 1L4)-Vs + 2.3 ~Vs - 1.4]V Common-Mode Rejection Ratio DC to 60 Hz with 1 kQ Source Imbalance Vem = 0 V to 10 V{ 110 130 120 130 110 130 dB OUTPUT Output Swing R, = 10k, Vy = 2.3 Vto#SV[-V5+L1 +Vg5 - 1.2|-Vs - LL +V5 1.2)-Vg + 11 +V5 - 1.2/V over Temperature -Vs- 1.4 +Vg - 1.3{-Vs + 14 +V5 1.3]-Vg + 1.6 +Vg > 13/V Vg = 5 Vto+18 V |-V, + 1.2 +V5 14|-Vy + 1.2 4+V5 1.4/-V5 + 1.2 +V,- LAlV over Temperature Vg + 4.6 +Vs - 1.5/-Vs + 1.6 +Vs5 1.5]-Vs + 2.3 Vo ~- 1L5/ Short Current Circuit +18 +18 +18 mA DYNAMIC RESPONSE Small Signal, : . -3 dB Bandwidth 200 200 * 200 kHz Slew Rate 0.75 12 0.75 1.2 0.75 1.2 Vins Settling Time to 0.01% 10 V Step 12 k 2 12 us REFERENCE INPUT Rw 20 20 20 ko lw VintiVeer = 0 +50 +60 +50 +60 +50 -60 wa Voltage Range Vetl6 - +Vs5 1.6/Vs + 1.6 +Vs5 1.6/Vy + 1.6 V5 - 1.6/ Gain to Output 1 + 0.0001 1 = 0.0001 1 + 0.0001 POWER SUPPLY Operating Range +23 218 2.3 +18 +23 ~18 Vv Quiescent Current Vg= 72.3ViI0o+18V 0.9 1.3 0.9 1.3 0.9 1.3 mA over Temperature Ld L6 ll 1.6 11 1.6 mA TEMPERATURE RANGE For Specified Performance 40 to +85 40 to +85 ~55 to +125 C NOTES 1See Analog Devices military data sheet for 883B tested specifications. *This is defined as the supply range over which PSRR is defined. *Input Voltage Range = CMV + (Gain x Voir). Specifications subject to change without notice. REV. A INSTRUMENTATION AMPLIFIERS 10-17AD621 ABSOLUTE MAXIMUM RATINGS! Supply Voltage 2.0... oe ee +18V Internal Power Dissipation? ................... 650 mW Input Voltage 2... 0... ee ees tVg Differential Input Voltage .........0.....-00--, +25 V Output Short Circuit Duration ............... Indefinite Storage Temperature Range (Q) ......... 65C to + 150C Storage Temperature Range (N, R)....... 65C to +125C Operating Temperature Range AD621A,B ..............-0.-.0.4. 40C to +85C AD6218* 2... eee 55C to +125C Lead Temperature Range (Soldering 10 seconds) ........... 0.000000 + 300C NOTES Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Specification is for device in free air: 8-Pin Plastic DIP Package: 6), = 95C/Wart 8-Pin Cerdip Package: 0,4 = 110C/Watt 8-Pin SOIC Package: 6), = 155C/Watt See Analog Devices military data sheet for 883B specifications. ESD SUSCEPTIBILITY ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 volts, which readily accumulate on the human body and on test equipment, can discharge without detection. Although the AD621 features proprietary ESD pro- tection circuitry, permanent damage may still occur on these devices if they are subjected to high energy electrostatic dis- charges. Therefore, proper ESD precautions are recommended to avoid any performance degradation or loss of functionality. ORDERING GUIDE Temperature Package Package Model Range Description Option! AD621AN 40C to +85C |8-Pin Plastic DIP |N-8 AD621BN 40C to +85C |8-Pin Plastic DIP |N-8 AD621AR 40C to +85C |8-Pin Plastic SOIC|R-8 AD621BR 40C to +85C |8-Pin Plastic SOIC} R-8 AD621SQ/883B7| 55C to +125C|8-Pin Cerdip Q-8 AD621ACHIPS |40C to +85C |Die NOTES For outline information see Package Information section. *See Analog Devices military data sheet for 883B specifications. METALIZATION PHOTOGRAPH Dimensions shown in inches and (mm) Contact factory for latest dimensions RG 8 10-18 INSTRUMENTATION AMPLIFIERS 0.125 (3.57) > OUTPUT 6 5 REFERENCE 0.0708 (2.845) REV.A