a Dual Low Power Operational Amplifier, Single or Dual Supply OP221 FEATURES Excellent TCV OS Match, 2 V/ⴗC Max Low Input Offset Voltage, 150 V Max Low Supply Current, 550 A Max Single Supply Operation, 5 V to 30 V Low Input Offset Voltage Drift, 0.75 V/ⴗC High Open-Loop Gain, 1500 V/mV Min High PSRR, 3 V/V Wide Common-Mode Voltage Range, V– to within 1.5 V of V+ Pin Compatible with 1458, LM158, LM2904 Available in Die Form PIN CONNECTIONS 8-Lead SOIC (S-Suffix) +IN A 1 8 –IN A V– 2 7 OUT A +IN B 3 6 V+ –IN B 4 5 OUT B NC = NO CONNECT GENERAL DESCRIPTION The OP221 is a monolithic dual operational amplifier that can be used either in single or dual supply operation. The wide supply voltage range, wide input voltage range, and low supply current drain of the OP221 make it well-suited for operation from batteries or unregulated power supplies. provide high performance in instrumentation amplifier designs. The individual amplifiers feature very low input offset voltage, low offset voltage drift, low noise voltage, and low bias current. They are fully compensated and protected. Matching between channels is provided on all critical parameters including input offset voltage, tracking of offset voltage vs. temperature, non-inverting bias currents, and common-mode rejection. The excellent specifications of the individual amplifiers combined with the tight matching and temperature tracking between channels SIMPLIFIED SCHEMATIC V+ Q11 Q28 Q12 Q3 –IN Q26 Q4 Q1 OUTPUT Q2 Q9 +IN Q27 Q10 Q7 Q4 Q29 Q6 Q5 Q13 NULL* Q33 V– *ACCESSIBLE IN CHIP FORM ONLY REV. C 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. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 OP221–SPECIFICATIONS (Electrical Characteristics at V = ⴞ2.5 V to ⴞ15 V, T = 25ⴗC, unless otherwise noted.) s A OP221G Parameter Symbol Conditions Input Offset Voltage VOS Input Offset Current Ios VCM = 0 Input Bias Current IB VCM = 0 Min 1 IVR V+ = 5 V, V– = 0 V VS = ± 15 V Common-Mode Rejection Ratio CMRR V+ = –5 V, V– = 0 V 0 V £ VCM £ 3.5 V VS = ± 15 V –15 V £ VCM £ 13.5 V Power Supply Rejection Ratio PSRR VS = ± 2.5 V to ± 15 V V– = 0 V, V+ = 5 V to 30 V Large-Signal Voltage Gain Avo VS = ± 15 V, RL = 10 kW VO = ± 10 V Output Voltage Swing VO V+ = 5 V, V– = 0 V RL = 10 kW VS = 15 V, RL = 10 kW SR Bandwidth BW Supply Current (Both Amplifiers) ISY RL = 10 kW Max Unit 250 500 mV 1.5 7 nA 70 120 nA 0/3.5 –15/13.5 Input Voltage Range Slew Rate Typ 2 75 85 80 90 dB 32 57 –2– 100 180 mV/V 800 V/mV 0.8/4 V ± 13.5 0.2 VS = ± 2.5 V, No Load VS = ± 15 V, No Load V 0.3 V/mS 600 kHz 550 850 650 900 mA REV. C OP221 SPECIFICATIONS (Electrical Characteristics at V = ⴞ2.5 V to ⴞ15 V, –40ⴗC £ T £ +85ⴗC, unless otherwise noted.) S A OP221G Parameter Symbol Average Input Offset Voltage Drift1 Conditions Min Typ Max Unit TCVOS 2 3 mV/∞C Input Offset Voltage VOS 400 700 mV Input Offset Current IOS VCM = 0 2 10 nA Input Bias Current IB VCM = 0 80 140 nA 2 Input Voltage Range IVR V+ = 5 V, V– = 0 V VS = ± 15 V Common-Mode Rejection Ratio CMRR V+ = –5 V, V– = 0 V 0 V £ VCM £ 3.5 V VS = ± 15 V –15 V £ VCM £ 13.5 V 0/3.2 –15/13.2 PSRR VS = ± 2.5 V to ± 15 V V– = 0 V, V+ = 5 V to 30 V Large-Signal Voltage Gain AVO VS = ± 15 V, RL = 10 kW VO = ± 10 V Output Voltage Swing VO ISY 70 80 75 85 dB Power Supply Rejection Ratio Supply Current (Both Amplifiers) V V+ = 5 V, V– = 0 V RL = 10 kW VS = 15 V, RL = 10 kW 57 100 180 320 mV/V V/mV 600 0.9/3.7 V 13.2 VS = ± 2.5 V, No Load VS = ± 15 V, No Load 600 950 750 1000 mA NOTES 1 Sample tested. 2 Guaranteed by CMRR test limits. Matching Characteristics at Vs = ⴞ15 V, TA = 25ⴗC, unless otherwise noted. OP221G Parameter Symbol Input Offset Voltage Match DVOS Average Noninverting Bias Current IB + Noninverting Input Offset Current Conditions Min IOS+ Typ Max Unit 250 600 mV 120 nA 10 nA 4 Common-Mode Rejection Ratio Match1 DCMRR VCM = –15 V to 13.5 V Power Supply Rejection Ratio Match2 DPSRR VS = ± 2.5 V to ± 15 V 72 dB 140 mV/V NOTES 1 DCMRR is 20 log10 VCM/DCME, where VCM is the voltage applied to both noninverting inputs and DCME is the difference in common-mode input-referred error. 2 DPSRR is: Input-Referred Differential Error DVS REV. C –3– (Matching Characteristics at V = ⴞ15 V, –40ⴗC £ T £ +85ⴗC for OP221G, unless otherOP221–SPECIFICATIONS wise noted. G is sample tested.) s A . OP221G Parameter Symbol Input Offset Voltage Match DVOS Conditions Min Average Noninverting Bias Current IB + Input Offset Voltage Tracking ICDVOS Noninverting Input Offset Current IOS+ VCM = 0 Common-Mode Rejection Ratio Match1 DCMRR VCM = –15 V to 13.2 V Power Supply Rejection Ratio Match2 DPSRR Typ Max Unit 400 800 mV 140 nA VCM = 0 72 3 5 mV∞C 6 12 nA 80 dB 140 mV/V NOTES 1 DCMRR is 20 log10 VCM/DCME, where VCM is the voltage applied to both noninverting inputs and DCME is the difference in common-mode input-referred error. 2 DPSRR is: Input-Referred Differential Error DVS –4– REV. C OP221 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V Differential Input Voltage . . . . . . . . . . 30 V or Supply Voltage Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . Supply Voltage Output Short-Circuit Duration . . . . . . . . . . . . . . . . Indefinite Storage Temperature Range . . . . . . . . . . . . –65∞C to +150∞C Operating Temperature Range OP221G . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40∞C to +85∞C Lead Temperature (Soldering 60 sec) . . . . . . . . . . . . . . 300∞C Junction Temperature (TJ) . . . . . . . . . . . . . –65∞C to +150∞C Package Type JA (Note 2) JC Unit 8-Lead SOIC(S) 158 43 ∞C/W NOTES 1 Absolute maximum ratings apply to both DICE and packaged parts, unless otherwise noted. 2 JA is specified for device soldered to printed circuit board for SOIC package. ORDERING GUIDE TA = +25ⴗC VOS MAX (V) Plastic 8-Lead Operating Temperature Range Package Options 150 150 300 500 500 500 OP221GS XIND RN-8 Figure 1. Dice Characteristics CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the OP221 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. REV. C –5– WARNING! ESD SENSITIVE DEVICE OP221–Typical Perfomance Characteristics 140 140 140 dc dc 120 100Hz 80 1kHz 60 40 VS = ⴞ15V –25 100Hz 80 1kHz 60 40 VS = ⴞ15V 20 20 0 –50 10Hz 100 0 25 50 75 100 80 60 40 20 0 –50 125 TA = 25ⴗC RL = 15k⍀ 100 –25 0 25 50 75 100 0 125 ⴞ5 0 TEMPERATURE – ⴗC TEMPERATURE – ⴗC TPC 1. Open-Loop Gain at ± 15 V vs. Temperature ⴞ10 ⴞ15 SUPPLY VOLTAGE – V TPC 2. Open-Loop Gain at ± 5 V vs. Temperature TPC 3. Open-Loop Gain at vs. Supply Voltage 70 25 60 20 80 80 VS = ⴞ15V 60 VS = ⴞ5V 40 20 50 VOLTAGE GAIN – dB 100 CLOSED-LOOP GAIN – dB OPEN-LOOP GAIN – dB 120 40 30 20 10 0 TA = 25ⴗC VS = ⴞ15V 120 15 ⵰m = 42ⴗ 140 10 160 5 GAIN PHASE 0 180 –5 200 0 1 10 100 1k 10k 100k 220 –10 100k 1M 10M 1M FREQUENCY – Hz 120 VS = ⴞ15V PHASE MARGIN 850k 45 40 GAIN BANDWIDTH 800k 750k 650k 100 TA = 25ⴗC VS = ⴞ15V 100 +PSRR 80 80 CMRR – Hz 50 10M TPC 6. Gain and Phase Shift vs. Frequency 120 55 60 –PSRR 60 40 40 SLEW RATE 0.30 20 0.25 0.20 –50 10 TPC 5. Closed-Loop Gain vs. Frequency 700k SLEW RATE – V/sec 1 FREQUENCY – Hz PSRR – dB PHASE MARGIN – Degrees TPC 4. Open-Loop Gain at ± 15 V vs. Frequency 0.35 –10 100 1k 10k 100k 1M 10M FREQUENCY – Hz GAIN BANDWIDTH – Hz 0.1 100 PHASE SHIFT – Degrees 10Hz 100 120 OPEN-LOOP GAIN – dB OPEN-LOOP GAIN – dB OPEN-LOOP GAIN – dB 120 –25 0 25 50 75 100 125 TEMPERATURE – ⴗC TPC 7. Phase Margin, Gain Bandwidth, and Slew Rate vs. Temperature 0 10 TA = 25ⴗC VS = ⴞ15V 20 0 100 1k 10k FREQUENCY – Hz TPC 8. PSRR vs. Frequency –6– 100k 1 10 100 1k 10k 100k FREQUENCY – Hz TPC 9. CMRR vs. Frequency REV. C OP221 16 28 24 20 16 12 8 2.0 12 POSITIVE 10 NEGATIVE 8 6 4 TA = 25ⴗC VS = ⴞ2.5V NEGATIVE POSITIVE 1.0 2 4 0 100 0 1K 10k 100k FREQUENCY – Hz 1M TPC 10. Maximum Output Swing vs. Frequency 1k 10k LOAD RESISTANCE – ⍀ 100k 10 CURRENT NOISE – pA Hz 80 70 60 50 40 30 20 10 1.0 0.1 1 10 100 1k FREQUENCY – Hz TPC 13. Voltage Noise Density vs. Frequency REV. C 1 10 100 1k FREQUENCY – Hz TPC 13. Current Noise Density vs. Frequency –7– 0 100 1k 10k 100k LOAD RESISTANCE – ⍀ TPC 11. Maximum Output Voltage vs. Load Resistance 100 VOLTAGE NOISE – nV/ Hz TA = 25ⴗC VS = ⴞ15V 14 MAXIMUM OUTPUT – V TA = 25ⴗC VS = ⴞ15V RL = 10k⍀ MAXIMUM OUTPUT – V PEAK-TO-PEAK AMPLITUTDE – V 30 TPC 12. Maximum Output Voltage vs. Load Resistance OP221 Figure 2a. Noninverting Step Response Figure 3a. Inverting Step Response Figure 2b. Noninverting Step Response Figure 3b. Inverting Step Response INPUT 10k⍀ OUTPUT INPUT 10k⍀ 10k⍀ OUTPUT Figure 4. Noninverting Test Circuit Figure 5. Inverting Test Circuit –8– REV. C OP221 SPECIAL NOTES ON THE APPLICATION OF DUAL MATCHED OPERATIONAL AMPLIFIERS Advantages of Dual Monolithic Operational Amplifiers Dual matched operational amplifiers provide the engineer with a powerful tool for designing instrumentation amplifiers and many other differential-input circuits. These designs are based on the principle that careful matching between two operational amplifiers can minimize the effect of dc errors in the individual amplifiers. Reference to the circuit shown in Figure 6, a differential-in, differential-out amplifier, shows how the reductions in error can be accomplished. Assuming the resistors used are ideally matched, the gain of each side will be identical. If the offset voltages of each amplifier are perfectly matched, then the net differential voltage at the amplifier’s output will be zero. Note that the output offset error of this amplifier is not a function of the offset voltage of the individual amplifiers, but only a function of the difference (degree of matching) between the amplifiers’ offset voltages. This error-cancellation principle holds for a considerable number of input referred error parameters—offset voltage, offset voltage drift, inverting and noninverting bias currents, common mode and power supply rejection ratios. Note also that the impedances of each input, both common-mode and differential-mode, are high and tightly matched, an important feature not practical with single operation amplifier circuits. INSTRUMENTATION AMPLIFIER APPLICATIONS Two-Op Amp Configuration The two-op amp circuit (Figure 7) is recommended where the common-mode input voltage range is relatively limited; the common-mode and differential voltage both appear at V1. The high open-loop gain of the OP221 is very important in achieving good CMRR in this configuration. Finite open-loop gain of A1 (Ao1) causes undesired feedthrough of the common-mode input. For Ad/Ao, << 1, the common-mode error (CME) at the output due to this effect is approximately (2 Ad/Ao1) x VCM. This circuit features independent adjustment of CMRR and differential gain. Three-Op Amp Configuration The three-op amp circuit (Figure 8) has increased commonmode voltage range because the common-mode voltage is not amplified as it is in Figure 7. The CMR of this amplifier is directly proportional to the match of the CMR of the input op amps. CMRR can be raised even further by trimming the output stage resistors. R0 GAIN ADJ R2 R1 AD = 2 1+ R1 R0 1/2 OP221 R3 R4 V1 A1 VCM – 1/2VD – 1/2 R3 OP221 Vd R1 + OP221 INPUT VCM + 1/2VD + R4 VO = R3 OUTPUT 1+1 2 R2 + R3 R1 R4 – R2 SIDE ‘R’ VO – ADVD A2 + SIDE ‘A’ + R2 + R3 R0 Vd + R4 R3 R3 – R2 R4 R1 IF R1 = R2 = R3 = R4, THEN VO = 2 1 + R1 VD R0 – Figure 7. Two-Op Amp Circuit R4 R1 VO = 2 1 + Figure 6. Differential-In, Differential-Out Amplifier VCM – 1/2VD 1/2 R0 V1 VD V+ OP221 OP221 A3 R1 Vd 2R1 R0 R2 R2 A1 – V+ R2 – VCM + 1/2VD A2 1/2 V2 OP221 V– R2 V– Figure 8. Three-Op Amp Circuit REV. C VCM –9– VO OP221 OUTLINE DIMENSIONS 8-Lead Standard Small Outline Package [SOIC] Narrow Body (RN-8) Dimensions shown in millimeters and (inches) 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 8 5 1 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY SEATING 0.10 PLANE 6.20 (0.2440) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.33 (0.0130) 0.50 (0.0196) ⴛ 45ⴗ 0.25 (0.0099) 8ⴗ 0.25 (0.0098) 0ⴗ 1.27 (0.0500) 0.41 (0.0160) 0.19 (0.0075) COMPLIANT TO JEDEC STANDARDS MS-012AA 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 –10– REV. C OP221 Revision History Location Page 10/02—Data Sheet changed from REV. B to REV. C. Deleted 8-Lead CERDIP Package (Q-8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal Edits to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4 Edits to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6/02—Data Sheet changed from REV. A to REV. B. Edits to 8-Lead SOIC Package (R-8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 09/01—Data Sheet changed from REV. 0 to REV. A. Edits to PIN CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Global deletion of references to OP221B and OP221C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2, 3, 4 Edits to WAFER TEST LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Edits to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Edits to PACKAGE TYPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 REV. C –11– –12– PRINTED IN U.S.A. C00324–0–10/02(C)