Single-Supply, Rail-to-Rail, Low Power, FET Input Op Amp AD820

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1 Single-Supply, Rail-to-Rail, Low Power, FET Input Op Amp AD820 FEATURES True single-supply operation Output swings rail-to-rail Input voltage range extends below ground Single-supply capability from 5 V to 36 V Dual-supply capability from ±2.5 V to ±8 V Excellent load drive Capacitive load drive up to 350 pf Minimum output current of 5 ma Excellent ac performance for low power 800 μa maximum quiescent current Unity-gain bandwidth:.8 MHz Slew rate of 3 V/μs Excellent dc performance 800 μv maximum input offset voltage 2 μv/ C typical offset voltage drift 25 pa maximum input bias current Low noise: 3 nv/ 0 khz APPLICATIONS Battery-powered precision instrumentation Photodiode preamps Active filters 2-bit to 4-bit data acquisition systems Medical instrumentation Low power references and regulators GENERAL DESCRIPTION The AD820 is a precision, low power FET input op amp that can operate from a single supply of 5 V to 36 V, or dual supplies of ±2.5 V to ±8 V. It has true single-supply capability, with an input voltage range extending below the negative rail, allowing the AD820 to accommodate input signals below ground in the single-supply mode. Output voltage swing extends to within 0 mv of each rail, providing the maximum output dynamic range. Offset voltage of 800 μv maximum, offset voltage drift of 2 μv/ C, typical input bias currents below 25 pa, and low input voltage noise provide dc precision with source impedances up to GΩ..8 MHz unity gain bandwidth, 93 db THD at 0 khz, and 3 V/μs slew rate are provided for a low supply current of 800 μa. The AD820 drives up to 350 pf of direct capacitive load and provides a minimum output current of 5 ma. This allows the amplifier to handle a wide range of load conditions. This combination of ac and dc performance, plus the outstanding load drive capability, results in an exceptionally versatile amplifier for the single-supply user. PIN CONFIGURATIONS NULL IN 2 +IN 3 V S 4 NC IN 2 +IN 3 V S 4 AD820 TOP VIEW (Not to Scale) NC = NO CONNECT Figure. 8-Lead PDIP AD820 TOP VIEW (Not to Scale) NC = NO CONNECT NC +V S V OUT NULL NC +V S V OUT NC Figure 2. 8-Lead SOIC_N and 8-Lead MSOP The AD820 is available in two performance grades. The A and B grades are rated over the industrial temperature range of 40 C to +85 C. The AD820 is offered in three 8-lead package options: plastic DIP (PDIP), surface mount (SOIC) and (MSOP) % V V V µs Figure 3. Gain-of-2 Amplifier; V S = 5 V, 0 V, V IN = 2.5 V Sine Centered at.25 V Information furnished by Analog Devices is believed to be accurate and reliable. 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 Analog Devices, Inc. All rights reserved.

2 SPECIFICATIONS V S = 0 V, 5 T A = 25 C, V CM = 0 V, V OUT = 0.2 V, unless otherwise noted. Table. DC PERFORMANCE Initial Offset mv Maximum Offset over Temperature mv Offset Drift 2 2 μv/ C Input Bias Current V CM = 0 V to 4 V pa At T MAX na Input Offset Current pa At T MAX na Open-Loop Gain V OUT = 0.2 V to 4 V T MIN to T MAX R L = 00 kω V/mV V/mV T MIN to T MAX R L = 0 kω V/mV V/mV T MIN to T MAX R L = kω V/mV 0 0 V/mV NOISE/HARMONIC PERFORMANCE Input Voltage Noise f = 0. Hz to 0 Hz 2 2 μv p-p f = 0 Hz nv/ Hz f = 00 Hz 2 2 nv/ Hz f = khz 6 6 nv/ Hz f = 0 khz 3 3 nv/ Hz Input Current Noise f = 0. Hz to 0 Hz 8 8 fa p-p f = khz fa/ Hz Harmonic Distortion R L = 0 kω to 2.5 V f = 0 khz V OUT = 0.25 V to 4.75 V db DYNAMIC PERFORMANCE Unity Gain Frequency.8.8 MHz Full Power Response V OUT p-p = 4.5 V khz Slew Rate 3 3 V/μs Settling Time V OUT = 0.2 V to 4.5 V To 0.%.4.4 μs To 0.0%.8.8 μs INPUT CHARACTERISTICS Common-Mode Voltage Range T MIN to T MAX V CMRR V CM = 0 V to 2 V db T MIN to T MAX db Input Impedance Differential Ω pf Common Mode Ω pf Rev. F Page 3 of 24

3 OUTPUT CHARACTERISTICS Output Saturation Voltage 2 V OL V EE I SINK = 20 μa mv T MIN to T MAX 0 0 mv V CC V OH I SOURCE = 20 μa mv T MIN to T MAX mv V OL V EE I SINK = 2 ma mv T MIN to T MAX mv V CC V OH I SOURCE = 2 ma mv T MIN to T MAX mv V OL V EE I SINK = 5 ma mv T MIN to T MAX mv V CC V OH I SOURCE = 5 ma mv T MIN to T MAX mv Operating Output Current 5 5 ma T MIN to T MAX 2 2 ma Short-Circuit Current ma Capacitive Load Drive pf POWER SUPPLY Quiescent Current T MIN to T MAX μa Power Supply Rejection V+ = 5 V to 5 V db T MIN to T MAX db This is a functional specification. Amplifier bandwidth decreases when the input common-mode voltage is driven in the range ((V+) V) to V+. Common-mode error voltage is typically less than 5 mv with the common-mode voltage set at V below the positive supply. 2 V OL V EE is defined as the difference between the lowest possible output voltage (V OL ) and the negative voltage supply rail (V EE ). V CC V OH is defined as the difference between the highest possible output voltage (V OH ) and the positive supply voltage (V CC ). Rev. F Page 4 of 24

4 V S = ±5 T A = 25 C, V CM = 0 V, V OUT = 0 V, unless otherwise noted. Table 2. DC PERFORMANCE Initial Offset mv Maximum Offset over Temperature mv Offset Drift 2 2 μv/ C Input Bias Current V CM = 5 V to +4 V pa At T MAX na Input Offset Current pa At T MAX na Open-Loop Gain V OUT = 4 V to +4 V R L = 00 kω V/mV T MIN to T MAX V/mV R L = 0 kω V/mV T MIN to T MAX V/mV R L = kω V/mV T MIN to T MAX 0 0 V/mV NOISE/HARMONIC PERFORMANCE Input Voltage Noise f = 0. Hz to 0 Hz 2 2 μv p-p f = 0 Hz nv/ Hz f = 00 Hz 2 2 nv/ Hz f = khz 6 6 nv/ Hz f = 0 khz 3 3 nv/ Hz Input Current Noise f = 0. Hz to 0 Hz 8 8 fa p-p f = khz fa/ Hz Harmonic Distortion R L = 0 kω f = 0 khz V OUT = ±4.5 V db DYNAMIC PERFORMANCE Unity Gain Frequency.9.8 MHz Full Power Response V OUT p-p = 9 V khz Slew Rate 3 3 V/μs Settling Time V OUT = 0 V to ±4.5 V To 0.%.4.4 μs To 0.0%.8.8 μs INPUT CHARACTERISTICS Common-Mode Voltage Range T MIN to T MAX V CMRR V CM = 5 V to +2 V db T MIN to T MAX db Input Impedance Differential Ω pf Common Mode Ω pf Rev. F Page 5 of 24

5 OUTPUT CHARACTERISTICS Output Saturation Voltage 2 V OL V EE I SINK = 20 μa mv T MIN to T MAX 0 0 mv V CC V OH I SOURCE = 20 μa mv T MIN to T MAX mv V OL V EE I SINK = 2 ma mv T MIN to T MAX mv V CC V OH I SOURCE = 2 ma mv T MIN to T MAX mv V OL V EE I SINK = 5 ma mv T MIN to T MAX mv V CC V OH I SOURCE = 5 ma mv T MIN to T MAX mv Operating Output Current 5 5 ma T MIN to T MAX 2 2 ma Short-Circuit Current ma Capacitive Load Drive pf POWER SUPPLY Quiescent Current T MIN to T MAX μa Power Supply Rejection V+ = 5 V to 5 V db T MIN to T MAX db This is a functional specification. Amplifier bandwidth decreases when the input common-mode voltage is driven in the range ((V+) V) to V+. Common-mode error voltage is typically less than 5 mv with the common-mode voltage set at V below the positive supply. 2 V OL V EE is defined as the difference between the lowest possible output voltage (V OL ) and the negative voltage supply rail (V EE ). V CC V OH is defined as the difference between the highest possible output voltage (V OH ) and the positive supply voltage (V CC ). Rev. F Page 6 of 24

6 V S = ±5 T A = 25 C, V CM = 0 V, V OUT = 0 V, unless otherwise noted. Table 3. DC PERFORMANCE Initial Offset mv Maximum Offset over Temperature mv Offset Drift 2 2 μv/ C Input Bias Current V CM = 0 V pa V CM = 0 V pa At T MAX V CM = 0 V na Input Offset Current pa At T MAX na Open-Loop Gain V OUT = 0 V to +0 V R L = 00 kω V/mV T MIN to T MAX V/mV R L = 0 kω V/mV T MIN to T MAX V/mV R L = kω V/mV T MIN to T MAX V/mV NOISE/HARMONIC PERFORMANCE Input Voltage Noise f = 0. Hz to 0 Hz 2 2 μv p-p f = 0 Hz nv/ Hz f = 00 Hz 2 2 nv/ Hz f = khz 6 6 nv/ Hz f = 0 khz 3 3 nv/ Hz Input Current Noise f = 0. Hz to 0 Hz 8 8 fa p-p f = khz fa/ Hz Harmonic Distortion R L = 0 kω f = 0 khz V OUT = ±0 V db DYNAMIC PERFORMANCE Unity Gain Frequency.9.9 MHz Full Power Response V OUT p-p = 20 V khz Slew Rate 3 3 V/μs Settling Time V OUT = 0 V to ±0 V To 0.% μs To 0.0% μs INPUT CHARACTERISTICS Common-Mode Voltage Range T MIN to T MAX V CMRR V CM = 5 V to +2 V db T MIN to T MAX db Input Impedance Differential Ω pf Common Mode Ω pf Rev. F Page 7 of 24

7 OUTPUT CHARACTERISTICS Output Saturation Voltage 2 V OL V EE I SINK = 20 μa mv T MIN to T MAX 0 0 mv V CC V OH I SOURCE = 20 μa mv T MIN to T MAX mv V OL V EE I SINK = 2 ma mv T MIN to T MAX mv V CC V OH I SOURCE = 2 ma mv T MIN to T MAX mv V OL V EE I SINK = 5 ma mv T MIN to T MAX mv V CC V OH I SOURCE = 5 ma mv T MIN to T MAX mv Operating Output Current ma T MIN to T MAX 5 5 ma Short-Circuit Current ma Capacitive Load Drive pf POWER SUPPLY Quiescent Current T MIN to T MAX μa Power Supply Rejection V+ = 5 V to 5 V db T MIN to T MAX db This is a functional specification. Amplifier bandwidth decreases when the input common-mode voltage is driven in the range ((V+) V) to V+. Common-mode error voltage is typically less than 5 mv with the common-mode voltage set at V below the positive supply. 2 V OL V EE is defined as the difference between the lowest possible output voltage (V OL ) and the negative voltage supply rail (V EE ). V CC V OH is defined as the difference between the highest possible output voltage (V OH ) and the positive supply voltage (V CC ). Rev. F Page 8 of 24

8 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Supply Voltage Internal Power Dissipation 8-Lead PDIP (N) 8-Lead SOIC_N (R) 8-Lead MSOP (RM) Input Voltage Rating ±8 V.6 W.0 W 0.8 W ((V+) V) to (20 V + (V+)) Output Short-Circuit Duration Indefinite Differential Input Voltage ±30 V Storage Temperature Range 8-Lead PDIP (N) 65 C to +25 C 8-Lead SOIC_N (R) 65 C to +50 C 8-Lead MSOP (RM) 65 C to +50 C Operating Temperature Range / 40 C to +85 C Lead Temperature(Soldering, 60 sec) 260 C THERMAL RESISTANCE θ JA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 5. Thermal Resistance Package Type θ JA Unit 8-Lead PDIP (N) 90 C/W 8-Lead SOIC_N (R) 60 C/W 8-Lead MSOP (RM) 90 C/W Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; 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. ESD CAUTION Rev. F Page 9 of 24

9 OUTLINE DIMENSIONS (0.6) (9.27) (9.02) 0.20 (5.33) MAX 0.50 (3.8) 0.30 (3.30) 0.5 (2.92) (0.56) 0.08 (0.46) 0.04 (0.36) (2.54) BSC (7.) (6.35) (6.0) 0.05 (0.38) MIN SEATING PLANE (0.3) MIN (.52) MAX 0.05 (0.38) GAUGE PLANE (8.26) 0.30 (7.87) (7.62) (0.92) MAX 0.95 (4.95) 0.30 (3.30) 0.5 (2.92) 0.04 (0.36) 0.00 (0.25) (0.20) (.78) (.52) (.4) COMPLIANT TO JEDEC STANDARDS MS-00 CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. CORNER LEADS MAY BE CONFIGURED AS WHOLE OR HALF LEADS. Figure Lead Plastic Dual In-Line Package [PDIP] Narrow Body (N-8) Dimensions shown in inches and (millimeters) A 5.00 (0.968) 4.80 (0.890) 4.00 (0.574) 3.80 (0.497) (0.244) 5.80 (0.2284) 0.25 (0.0098) 0.0 (0.0040) COPLANARITY 0.0 SEATING PLANE.27 (0.0500) BSC.75 (0.0688).35 (0.0532) 0.5 (0.020) 0.3 (0.022) (0.0098) 0.7 (0.0067) 0.50 (0.096) 0.25 (0.0099).27 (0.0500) 0.40 (0.057) 45 COMPLIANT TO JEDEC STANDARDS MS-02-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) A Rev. F Page 20 of 24

10 PIN 0.65 BSC COPLANARITY MAX SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-87-AA Figure Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters ORDERING GUIDE Model Temperature Range Package Description Package Option Branding N 40 C to +85 C 8-Lead PDIP N-8 NZ 40 C to +85 C 8-Lead PDIP N-8 R 40 C to +85 C 8-Lead SOIC_N R-8 R-REEL 40 C to +85 C 8-Lead SOIC_N R-8 R-REEL7 40 C to +85 C 8-Lead SOIC_N R-8 RZ 40 C to +85 C 8-Lead SOIC_N R-8 RZ-REEL 40 C to +85 C 8-Lead SOIC_N R-8 RZ-REEL7 40 C to +85 C 8-Lead SOIC_N R-8 RMZ 40 C to +85 C 8-Lead MSOP RM-8 A2L RMZ-RL 40 C to +85 C 8-Lead MSOP RM-8 A2L RMZ-R7 40 C to +85 C 8-Lead MSOP RM-8 A2L R 40 C to +85 C 8-Lead SOIC_N R-8 R-REEL 40 C to +85 C 8-Lead SOIC_N R-8 R-REEL7 40 C to +85 C 8-Lead SOIC_N R-8 RZ 40 C to +85 C 8-Lead SOIC_N R-8 RZ-REEL 40 C to +85 C 8-Lead SOIC_N R-8 RZ-REEL7 40 C to +85 C 8-Lead SOIC_N R-8 Z = RoHS Compliant Part. Rev. F Page 2 of 24

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