Precision Micropower a Single-Supply Operational Amplifiers OP777/OP727/OP747 FEATURES FUNCTIONAL BLOCK DIAGRAMS Low Offset Voltage: 100 �V Max 8-Lead MSOP 14-Lead SOIC Low Input Bias Current: 10 nA Max (RM-8) (R-14) Single-Supply Operation: 3.0 V to 30 V Dual-Supply Operation: �1.5 V to �15 V 1 8 NC NC Low Supply Current: 300 �A/Amp Max OUT A 1 14 OUT D �IN V+ OP777 Unity Gain Stable �IN OUT 2 –IN A 13 –IN D V� NC 45 No Phase Reversal 3 �IN A 12 �IN D NC = NO CONNECT OP747 4 APPLICATIONS V� 11 V– TOP VIEW (Not to Scale) Current Sensing (Shunt) 5 �IN B 10 �IN C 8-Lead SOIC Line or Battery-Powered Instrumentation 6 9 –IN B –IN C (R-8) Remote Sensors 7 8 OUT B OUT C Precision Filters OP727 SOIC Pin-Compatible with LT1013 NC NC 1 8 OP777 14-Lead TSSOP �IN 2 7 V+ GENERAL DESCRIPTION (RU-14) +IN 3 6 OUT The OP777 , OP727 , and OP747 are precision single , dual, V� 4 5 NC and quad rail-to-rail output single- supply amplifiers featuring OUT A 1 14 OUT D micropower operation and rail-to-rail output ranges. Th ese NC = NO CONNECT 2 amplifier s provide improved performance over the industry -standard –IN A 13 –IN D OP07 with ± 15 V supplies , and offer the further advantage of true 3 �IN A 12 �IN D 8-Lead TSSOP OP747 single -supply operation down to3.0 V , and smaller package 4 V� 11 V– (RU-8) TOP VIEW options than any other high-voltage precision bipolar amplifier. (Not to Scale) 5 10 �IN B �IN C Outputs are stable with capacitive loads of over 500 pF. Supply 6 9 –IN B –IN C OUT A 1 8 V� current is less than 300 μA per amplifier at 5 V. 500 Ω series resis- 7 8 OUT B OUT C 2 7 tors protect the inputs, allowing input signal levels several volts above –IN A OP727 OUT B TOP VIEW the positive supply without phase reversal. 3 6 �IN A –IN B (Not to Scale) V– 4 5 �IN B Applications for these amplifiers include both line-powered and portable instrumentation, remote sensor signal conditioning, and precision filters. 8-Lead SOIC The OP777, OP727, and OP747 are specified over the extended (R-8) industrial (–40°C to +85°C) temperature range. The OP777, single, is available in 8-lead MSOP and 8-lead SOIC packages. �IN A 1 8 –IN A The OP747, quad, is available in 14-lead TSSOP and narrow V– 2 OP727 7 OUT A 14-lead SO packages. Surface-mount devices in TSSOP and MSOP TOP VIEW �IN B 3 6 V� (Not to Scale) packages are available in tape and reel only. –IN B 4 5 OUT B The OP727, dual, is available in 8-lead TSSOP and 8-lead SOIC packages. The OP727 8-lead SOIC pin configuration NOTE: THIS PIN CONFIGURATION DIFFERS FROM THE STANDARD 8-LEAD differs from the standard 8-lead operational amplifier pinout. OPERATIONAL AMPLIFIER PINOUT. SIMILAR LOW POWER PRODUCTS Supply Voltage/ Supply Current 1.8 V/1 μA 1.8 V/20 μA 1.8 V/25 μA 1.8 V/50 μA 2.5 V/1 mA 3.0 V/200 μA 4 V/215 μA Single AD8500 ADA4051-1 AD8505 AD8603/AD8613 ADA4528-1 Dual AD8502 ADA4051-2 AD8506 AD8607/AD8617 ADA4091-2 AD8622 Quad AD8504 AD8508 AD8609/AD8619 ADA4091-4 AD8624 D REV. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties that Tel: 781/329-4700 www.analog.com may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781/461-3113 © Analog Devices, Inc., 2011 OP777/OP727/OP747–SPECIFICATIONS ELECTRICAL CHARACTERISTICS (@ V = 5.0 V, V = 2.5 V, T = 25�C unless otherwise noted.) S CM A Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage OP777 V +25 �C < T < +85 �C 20 100 μV OS A –40°C < T < +85 °C 50 200 μV A Offset Voltage OP727/OP747 +25 �C < T < +85 �C 30 160 μV A –40°C < T < +85 °C 60 300 μV A Input Bias Current I –40°C < T < +85 °C 5.5 11 nA B A Input Offset Current I –40°C < T < +85 °C 0.1 2 nA OS A Input Voltage Range 0 4 V Common-Mode Rejection Ratio CMRR V = 0 V to 4 V 104 110 dB CM Large Signal Voltage Gain A R = 10 k Ω , V = 0.5 V to 4.5 V 300 500 V/mV VO L O Offset Voltage Drift OP777 ΔV /ΔT –40°C < T < +85 °C 0.3 1.3 μV/°C OS A Offset Voltage Drift OP727/OP747 ΔV /ΔT –40°C < T < +85 °C 0.4 1.5 μV/°C OS A OUTPUT CHARACTERISTICS Output Voltage High V I = 1 mA, –40 °C to +85 °C 4.88 4.91 V OH L Output Voltage Low V I = 1 mA, –40 °C to +85 °C 126 140 mV OL L Output Circuit I V < 1 V ±10 mA OUT DROPOUT POWER SUPPLY Power Supply Rejection Ratio PSRR V = 3 V to 30 V 120 130 dB S Supply Current/Amplifier OP777 I V = 0 V 220 270 μA SY O –40°C < T < +85 °C 270 320 μA A Supply Current/Amplifier OP727/OP747 V = 0 V 235 290 μA O –40°C < T < +85 °C 290 350 μA A DYNAMIC PERFORMANCE Slew Rate SR R = 2 k Ω 0.2 V/μs L Gain Bandwidth Product GBP 0.7 MHz NOISE PERFORMANCE Voltage Noise e p-p 0.1 Hz to 10 Hz 0.4 μV p-p n Voltage Noise Density e f = 1 kHz 15 nV/√Hz n Current Noise Density i f = 1 kHz 0.13 pA/√Hz n NOTES Typical specifications: >50% of units perform equal to or better than the “typical” value. Specifications subject to change without notice. D –2– REV. OP777/OP727/OP747 (@ �15 V, V = 0 V, T = 25�C unless otherwise noted.) ELECTRICAL CHARACTERISTICS CM A Parameter Symbol Conditions Min Typ Max Unit INPUT CHARACTERISTICS Offset Voltage OP777 V +25 °C < T < +85 °C 30 100 μV OS A –40°C < T < +85 °C 50 200 μV A Offset Voltage OP727/OP747 V +25 °C < T < +85 °C 30 160 μV OS A –40°C < T < +85 °C 50 300 μV A Input Bias Current I –40°C < T < +85 °C510nA B A Input Offset Current I –40°C < T < +85 °C 0.1 2 nA OS A Input Voltage Range –15 +14 V Common-Mode Rejection Ratio CMRR V = –15 V to +14 V 110 120 dB CM Large Signal Voltage Gain A R = 10 k Ω , V = –14.5 V to +14.5 V 1,000 2,500 V/mV VO L O Offset Voltage Drift OP777 ΔV /ΔT –40°C < T < +85 °C 0.3 1.3 μV/°C OS A Offset Voltage Drift OP727/OP747 ΔV /ΔT –40°C < T < +85 °C 0.4 1.5 μV/°C OS A OUTPUT CHARACTERISTICS Output Voltage High V I = 1 mA, –40 °C to +85 °C +14.9 +14.94 V OH L Output Voltage Low V I = 1 mA, –40 °C to +85 °C –14.94 –14.9 V OL L Output Circuit I ±30 mA OUT POWER SUPPLY Power Supply Rejection Ratio PSRR V = ± 1.5 V to ± 15 V 120 130 dB S Supply Current/Amplifier OP777 I V = 0 V 300 350 μA SY O –40°C < T < +85 °C 350 400 μA A Supply Current/Amplifier OP727/747 V = 0 V 320 375 μA O –40°C < T < +85 °C 375 450 μA A DYNAMIC PERFORMANCE Slew Rate SR R = 2 k Ω 0.2 V/μs L Gain Bandwidth Product GBP 0.7 MHz NOISE PERFORMANCE Voltage Noise e p-p 0.1 Hz to 10 Hz 0.4 μV p-p n Voltage Noise Density e f = 1 kHz 15 nV/√Hz n Current Noise Density i f = 1 kHz 0.13 pA/√Hz n Specifications subject to change without notice. D REV. –3– OP777/OP727/OP747 1, 2 ABSOLUTE MAXIMUM RATINGS 3 Package Type � � Unit JA JC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 V 8-Lead MSOP (RM) 190 44 °C/W Input Voltage . . . . . . . . . . . . . . . . . . . . –V – 5 V to +V + 5 V S S 8-Lead SOIC (R) 158 43 °C/W Differential Input Voltage . . . . . . . . . . . . . . ± Supply Voltage 8-Lead TSSOP (RU) 240 43 °C/W Output Short-Circuit Duration to GND . . . . . . . . . Indefinite 14-Lead SOIC (R) 120 36 °C/W Storage Temperature Range 14-Lead TSSOP (RU) 180 35 °C/W RM, R, RU Packages . . . . . . . . . . . . . . . . –65°C to +150°C Operating Temperature Range NOTES 1 OP777/OP727/OP747 . . . . . . . . . . . . . . . –40°C to +85°C Absolute maximum ratings apply at 25°C, unless otherwise noted. 2 Stresses above those listed under Absolute Maximum Ratings may cause perma- Junction Temperature Range nent damage to the device. This is a stress rating only; functional operation of the RM, R, RU Packages . . . . . . . . . . . . . . . . –65°C to +150°C device at these or any other conditions above those listed in the operational Lead Temperature Range (Soldering, 60 sec) . . . . . . . 300°C sections of this specification is not implied. Exposure to absolute maximum rating Electrostatic Discharge (Human Body Model) . . . . 2000 V max conditions for extended periods may affect device reliability. 3 θ is specified for worst-case conditions, i.e., θ is specified for device soldered in JA JA circuit board for surface-mount packages. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily WARNING! accumulate on the human body and test equipment and can discharge without detection. Although the OP777/OP727/OP747 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD ESD SENSITIVE DEVICE precautions are recommended to avoid performance degradation or loss of functionality. D –4– REV. Typical Performance Characteristics– OP777/OP727/OP747 30 220 220 V = �15V V = 5V SY V = �15V SY SY 200 200 = 2.5V V = 0V V CM CM V = 0V CM 25 T = 25�C T = 25�C 180 180 A T = �40�C TO +85�C A A 160 160 20 140 140 120 120 15 100 100 80 80 10 60 60 40 40 5 20 20 0 0 0 �100 �80�60 �40�20 0 20 40 60 80 100 �100 �80�60 �40�20 0 20 40 60 80 100 0 0.2 0.4 0.6 0.8 1.0 1.2 OFFSET VOLTAGE – �V OFFSET VOLTAGE – �V INPUT OFFSET DRIFT – �V/�C TPC 1. OP777 Input Offset Voltage TPC 2. OP777 Input Offset Voltage TPC 3. OP777 Input Offset Voltage Distribution Distribution Drift Distribution 200 600 600 V = �15V V = �15V SY V = 5V SY SY 180 V = 0V V = 0V CM V = 2.5V CM CM 500 500 T = 25�C T = –40�C TO +85�C A T = 25�C 160 A A 140 400 400 120 100 300 300 80 200 200 60 40 100 100 20 0 0 0 –120 –80 –40 0 40 80 120 –120 –80 –40 0 40 80 120 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 TCV – �V/�C �V OFFSET VOLTAGE – �V OS TPC 4. OP727/OP747 Input Offset TPC 5. OP747 Input Offset Voltage TPC 6. OP747 Input Offset Voltage Voltage Drift (TCV Distribution) Distribution Distribution OS 600 30 600 V = �15V V = 5V SY V = �15V SY SY V = 0V V = 2.5V CM V = 0V CM CM 500 500 T = 25�C 25 A T = 25�C T = 25�C A A 400 400 20 300 300 15 200 200 10 100 100 5 0 0 0 �140 040 80 120 �140�120 �80 �40 040 80 120 �120 �80 �40 3 5 7 4 6 8 OFFSET VOLTAGE – �V INPUT BIAS CURRENT – nA OFFSET VOLTAGE – �V TPC 7. OP727 Input Offset Voltage TPC 8. OP727 Input Offset Voltage TPC 9. Input Bias Current Distribution Distribution Distribution D REV. –5– NUMBER OF AMPLIFIERS QUANTITY – Amplifiers NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS QUANTITY – Amplifiers NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS OP777/OP727/OP747 10k 10k 6 V = �15V V = 5V S S V = �15V SY T = 25�C T = 25�C A A 5 1k 1k SINK 4 100 100 SOURCE 10 10 SINK 3 2 1.0 1.0 SOURCE 0.1 1 0.1 0 0 0 0.001 0.01 0.1 1 10 100 0.001 0.01 0.1 1 10 100 �60 �40 �20 0 20 40 60 80 100 120 140 LOAD CURRENT – mA LOAD CURRENT – mA TEMPERATURE – �C TPC 10. Output Voltage to Supply TPC 11. Output Voltage to Supply TPC 12. Input Bias Current vs. Rail vs. Load Current Rail vs. Load Current Temperature 500 350 140 V = �15V T = 25�C SY A 400 120 C = 0 LOAD 300 R = I (V = �15V) LOAD 300 SY+ SY 100 250 200 80 0 I (V = 5V) 100 60 SY+ SY 45 200 0 40 90 150 �100 20 135 I (V = 5V) �200 SY� SY 0 100 180 �300 –20 225 50 I (V = �15V) �400 SY� SY –40 270 0 �500 –60 053 10 15 20 25 305 �60 �40 �20 0 20 40 60 80 100 120 140 10 100 1k 10k 100k 1M 10M 100M SUPPLY VOLTAGE – V TEMPERATURE – �C FREQUENCY – Hz TPC 13. Supply Current vs. TPC 14. Supply Current vs. Supply TPC 15. Open Loop Gain and Temperature Voltage Phase Shift vs. Frequency 140 60 60 V = 5V V = �15V SY V = 5V SY SY 120 50 C = 0 C = 0 LOAD 50 C = 0 LOAD LOAD R = R = 2k� LOAD LOAD R = 2k� 100 40 LOAD 40 A = �100 V A = �100 V 80 0 30 30 20 60 45 20 A = �10 V A = �10 V 40 10 90 10 0 20 135 0 A = +1 V A = +1 V 0 180 �10 �10 –20 225 �20 �20 –40 270 �30 �30 –60 �40 �40 100 1k 10k 100k 1M 10M 100M 1k 10k 100k 1M 10M 100M 1k 10k 100k 1M 10M 100M FREQUENCY – Hz FREQUENCY – Hz FREQUENCY – Hz TPC 16. Open Loop Gain and TPC 17. Closed Loop Gain vs. TPC 18. Closed Loop Gain vs. Phase Shift vs. Frequency Frequency Frequency D –6– REV. OPEN-LOOP GAIN – dB SUPPLY CURRENT – �A �OUTPUT VOLTAGE – mV PHASE SHIFT – Degrees SUPPLY CURRENT – �A CLOSED-LOOP GAIN – dB �OUTPUT VOLTAGE – mV CLOSED-LOOP GAIN – dB OPEN-LOOP GAIN – dB INPUT BIAS CURRENT – nA PHASE SHIFT – Degrees OP777/OP727/OP747 300 300 V = �2.5V V = 5V SY V = �15V SY SY 270 270 R = 2k� A = 1 V L C = 300pF L 240 240 210 210 A = 1 A = 1 V V 180 180 0V 150 150 120 120 90 90 A = 100 V 60 A = 10 60 V A = 10 A = 100 V V 30 30 0 0 100 1k 10k 100k 1M 10M 100M 100 1k 10k 100k 1M 10M 100M TIME – 100�s/DIV FREQUENCY – Hz FREQUENCY – Hz TPC 19. Output Impedance vs. TPC 20. Output Impedance vs. TPC 21. Large Signal Transient Frequency Frequency Response V = �15V V = �2.5V V = �15V SY SY SY R = 2k� C = 300pF C = 300pF L L L C = 300pF R = 2k� R = 2k� L L L V = 100mV V = 100mV IN IN A = 1 V A = 1 A = 1 V V 0V TIME – 100�s/DIV TIME – 10�s/DIV TIME – 10�s/DIV TPC 22. Large Signal Transient TPC 23. Small Signal Transient TPC 24. Small Signal Transient Response Response Response 40 35 V = �2.5V V = �15V SY SY INPUT R = 2k� R = 2k� 35 L L +200mV 30 V = 100mV V = 100mV IN IN 30 0V 25 �OS V = �15V SY +OS 25 R = 10k� L 20 A = �100 V 20 �OS V = 200mV IN �OS 15 15 0V 10 10 �10V 5 5 OUTPUT 0 0 110 100 1k 1 10 100 1k 10k TIME – 40�s/DIV CAPACITANCE – pF CAPACITANCE – pF TPC 25. Small Signal Overshoot TPC 26. Small Signal Overshoot TPC 27. Negative Overvoltage vs. Load Capacitance vs. Load Capacitance Recovery D REV. –7– OUTPUT IMPEDANCE – � SMALL SIGNAL OVERSHOOT – % VOLTAGE – 1V/DIV OUTPUT IMPEDANCE – � SMALL SIGNAL OVERSHOOT – % VOLTAGE – 50mV/DIV VOLTAGE – 50mV/DIV VOLTAGE – 1V/DIV OP777/OP727/OP747 200mV INPUT INPUT INPUT 0V 0V 0V V = �15V SY V = �2.5V V = �2.5V SY SY �200mV �200mV R = 10k� L R = 10k� R = 10k� L L A = �100 V A = �100 A = �100 V V V = �200mV IN V = 200mV V = �200mV IN IN 10V 0V 2V OUTPUT 0V �2V 0V OUTPUT OUTPUT TIME – 40�s/DIV TIME – 40�s/DIV TIME – 40�s/DIV TPC 28. Positive Overvoltage TPC 29. Negative Overvoltage TPC 30. Positive Overvoltage Recovery Recovery Recovery 140 140 V = �15V S V = �2.5V V = �15V INPUT SY SY A = 1 V 120 120 100 100 OUTPUT 80 80 60 60 40 40 20 20 0 0 10 100 1k 10k 100k 1M 10M 10 100 1k 10k 100k 1M 10M TIME – 400�s/DIV FREQUENCY – Hz FREQUENCY – Hz TPC 31. No Phase Reversal TPC 32. CMRR vs. Frequency TPC 33. CMRR vs. Frequency 140 140 V = 5V V = �2.5V SY SY V = �15V SY GAIN = 10M 120 120 +PSRR 100 100 �PSRR +PSRR 80 80 �PSRR 60 60 40 40 20 20 0 0 10 100 1k 10k 100k 1M 10M 10 100 1k 10k 100k 1M 10M TIME – 1s/DIV FREQUENCY – Hz FREQUENCY – Hz TPC 34. PSRR vs. Frequency TPC 35. PSRR vs. Frequency TPC 36. 0.1 Hz to 10 Hz Input Voltage Noise D –8– REV. PSRR – dB VOLTAGE – 5V/DIV PSRR – dB CMRR – dB CMRR – dB VOLTAGE – 1V/DIV OP777/OP727/OP747 90 90 V = �15V V = �15V V = �2.5V SY SY SY GAIN = 10M 80 80 70 70 60 60 50 50 40 40 30 30 20 20 10 10 0 100 200 300 400 500 0 100 200 300 400 500 TIME – 1s/DIV FREQUENCY – Hz FREQUENCY – Hz TPC 37. 0.1 Hz to 10 Hz Input TPC 38. Voltage Noise Density TPC 39. Voltage Noise Density Voltage Noise 50 40 40 V = 5V V = �2.5V SY V = �15V SY SY 40 35 35 30 30 30 20 I SC� 25 25 10 20 0 20 �10 15 15 �20 I 10 SC+ 10 �30 5 5 �40 0 �50 0 0 500 1k 1.5k 2.0k 2.5k �60 �40 �20 0 20 40 60 80 100 120 140 0 500 1k 1.5k 2.0k 2.5k FREQUENCY – Hz TEMPERATURE – �C FREQUENCY – Hz TPC 40. Voltage Noise Density TPC 41. Voltage Noise Density TPC 42. Short Circuit Current vs. Temperature 160 50 4.95 V = �15V V = 5V V = 5V SY SY SY 40 150 I = 1mA I = 1mA L L 4.94 30 140 I 20 SC� 130 4.93 10 120 0 4.92 110 �10 100 4.91 �20 90 �30 I 4.90 SC+ 80 �40 �50 70 4.89 �60 �40 �20 0 �60 �40 �20 0 20 40 60 80 100 120 140 �60 �40 �20 0 20 40 60 80 100 120 140 20 40 60 80 100 120 140 TEMPERATURE – �C TEMPERATURE – �C TEMPERATURE – �C TPC 43. Short Circuit Current vs. TPC 44. Output Voltage High vs. TPC 45. Output Voltage Low vs. Temperature Temperature Temperature D REV. –9– SHORT CIRCUIT CURRENT – mA VOLTAGE NOISE DENSITY – nV/ Hz VOLTAGE – 1V/DIV OUTPUT VOLTAGE HIGH – V VOLTAGE NOISE DENSITY – nV/ Hz VOLTAGE NOISE DENSITY – nV/ Hz SHORT CIRCUIT CURRENT – mA VOLTAGE NOISE DENSITY – nV/ Hz OUTPUT VOLTAGE LOW – mV OP777/OP727/OP747 14.964 1.5 �14.930 V = �15V V = �15V SY SY V = �15V SY 14.962 I = 1mA I = 1mA L L V = 0V CM 1.0 �14.935 14.960 T = 25�C A 14.958 0.5 �14.940 14.956 0 14.954 �14.945 14.952 �0.5 �14.950 14.950 14.948 �1.0 �14.955 14.946 14.944 �14.960 �1.5 �40 �20 �40 �20 0 �60 0 20 40 60 80 100 120 140 �60 0 20 40 60 80 100 120 140 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 TIME – Minutes TEMPERATURE – �C TEMPERATURE – �C TPC 46. Output Voltage High vs. TPC 47. Output Voltage Low vs. TPC 48. Warm-Up Drift Temperature Temperature BASIC OPERATION The OP777/OP727/OP747 amplifier uses a precision Bipolar PNP input stage coupled with a high-voltage CMOS output stage. This enables this amplifier to feature an input voltage V OUT range which includes the negative supply voltage (often ground- in single-supply applications) and also swing to within 1 mV of the 0V output rails. Additionally, the input voltage range extends to within 1 V of the positive supply rail. The epitaxial PNP input structure V IN provides high breakdown voltage, high gain, and an input bias cur- rent figure comparable to that obtained with a “Darlington” input stage amplifier but without the drawbacks (i.e., severe penalties for input voltage range, offset, drift and noise). The PNP input structure also greatly lowers the noise and reduces the dc input error terms. TIME – 0.2ms/DIV Supply Voltage Figure 1. Input and Output Signals with V < 0 V CM The amplifiers are fully specified with a single 5 V supply and, due to design and process innovations, can also operate with a supply 100k� voltage from 3.0 V up to 30 V. This allows operation from most 100k� +3V split supplies used in current industry practice, with the advantage of substantially increased input and output voltage ranges over �0.27V conventional split-supply amplifiers. The OP777/OP727/OP747 100k� series is specified with (V = 5 V, V– = 0 V and V = 2.5 V SY CM OP777/ which is most suitable for single-supply application. With PSRR of 100k� OP727/ 130 dB (0.3 μV/V) and CMRR of 110 dB (3 μV/V) offset is mini- OP747 �0.1V mally affected by power supply or common-mode voltages. Dual supply, ±15 V operation is also fully specified. V = 1kHz at 400mV p-p IN Input Common-Mode Voltage Range Figure 2. OP777/OP727/OP747 Configured as a Differ- The OP777/OP727/OP747 is rated with an input common-mode ence Amplifier Operating at V < 0 V CM voltage which extends from the minus supply to within 1 V of the positive supply. However, the amplifier can still operate with input voltages slightly below V . In Figure 2, OP777/OP727/OP747 is EE configured as a difference amplifier with a single supply of 3.0 V and negative dc common-mode voltages applied at the inputs terminals. A 400 mV p-p input is then applied to the noninverting input. It can be seen from the graph below that the output does not show any distortion. Micropower operation is maintained by using large input and feedback resistors. D –10– REV. OUTPUT VOLTAGE HIGH – V OUTPUT VOLTAGE LOW – V VOLTAGE – 100mV/DIV �V – �V OS OP777/OP727/OP747 Input Over Voltage Protection V = �15V SY When the input of an amplifier is more than a diode drop below V IN V , or above V , large currents will flow from the substrate EE CC (V–) or the positive supply (V+), respectively, to the input pins V OUT which can destroy the device. In the case of OP777/OP727/ OP747, differential voltages equal to the supply voltage will not cause any problem (see Figure 3). OP777/OP727/OP747 has built-in 500 Ω internal current limiting resistors, in series with the inputs, to minimize the chances of damage. It is a good practice to keep the current flowing into the inputs below 5 mA. In this con- text it should also be noted that the high breakdown of the input transistors removes the necessity for clamp diodes between the inputs of the amplifier, a feature that is mandatory on many preci- TIME – 400�s/DIV sion op amps. Unfortunately, such clamp diodes greatly interfere Figure 4. No Phase Reversal with many application circuits such as precision rectifiers and comparators. The OP777/OP727/OP747 series is free from such Output Stage limitations. The CMOS output stage has excellent (and fairly symmetric) output drive and with light loads can actually swing to within 1 mV of both 30V supply rails. This is considerably better than similar amplifiers featuring (so-called) rail-to-rail bipolar output stages. OP777/ OP727/OP747 is stable in the voltage follower configuration and responds to signals as low as 1 mV above ground in single supply OP777/ operation. V p-p = 32V OP727/ OP747 3.0 V TO 30V Figure 3a. Unity Gain Follower V = 1mV OUT V = �15V SY V = 1mV IN OP777/ V IN OP727/ OP747 V OUT Figure 5. Follower Circuit TIME – 400�s/DIV 1.0mV Figure 3b. Input Voltage Can Exceed the Supply Voltage Without Damage Phase Reversal Many amplifiers misbehave when one or both of the inputs are forced beyond the input common-mode voltage range. Phase TIME – 10�s/DIV reversal is typified by the transfer function of the amplifier effectively Figure 6. Rail-to-Rail Operation reversing its transfer polarity. In some cases this can cause lockup in servo systems and may cause permanent damage or nonrecoverable Output Short Circuit parameter shifts to the amplifier. Many amplifiers feature compensa- The output of the OP777/OP727/OP747 series amplifier is protected tion circuitry to combat these effects, but some are only effective for from damage against accidental shorts to either supply voltage, the inverting input. Additionally, many of these schemes only work provided that the maximum die temperature is not exceeded on a for a few hundred millivolts or so beyond the supply rails. OP777/ long-term basis (see Absolute Maximum Rating section). Current of OP727/OP747 has a protection circuit against phase reversal up to 30 mA does not cause any damage. when one or both inputs are forced beyond their input common- A Low-Side Current Monitor mode voltage range. It is not recommended that the parts be In the design of power supply control circuits, a great deal of design continuously driven more than 3 V beyond the rails. effort is focused on ensuring a pass transistor’s long-term reliability over a wide range of load current conditions. As a result, monitoring D REV. –11– VOLTAGE – 5V/DIV VOLTAGE – 25mV/DIV VOLTAGE – 5V/DIV OP777/OP727/OP747 15V and limiting device power dissipation is of prime importance in these designs. Figure 7 shows an example of 5 V, single-supply current monitor that can be incorporated into the design of a voltage 1k� regulator with foldback current limiting or a high current power REF 2N2222 192 supply with crowbar protection. The design capitalizes on the 1/4 OP747 12k� R2 OP777’s common-mode range that extends to ground. Current 4 3 is monitored in the power supply return where a 0.1 Ω shunt 20k� +15V R1 R1 resistor, R , creates a very small voltage drop. The voltage at the SENSE inverting terminal becomes equal to the voltage at the noninverting V O R(1+�) R +15V 1/4 OP747 terminal through the feedback of Q1, which is a 2N2222 or equiva- �15V lent NPN transistor. This makes the voltage drop across R1 equal to R2 V = V � O REF the voltage drop across R . Therefore, the current through Q1 R1 SENSE 1/4 OP747 �R becomes directly proportional to the current through R , and � = SENSE �15V R the output voltage is given by: Figure 9. Linear Response Bridge ⎛ R2 ⎞ A single-supply current source is shown in Figure 10. Large resistors VV=− 5 ×RI× ⎜ ⎟ OUT SENSE L ⎝ R1 ⎠ are used to maintain micropower operation. Output current can be adjusted by changing the R2B resistor. Compliance voltage is: The voltage drop across R2 increases with I increasing, so V L OUT decreases with higher supply current being sensed. For the element VV≤−V L SAT S values shown, the V is 2.5 V for return current of 1 A. OUT 10pF 3.0 V TO 30V 5V 100k� R2 = 2.49k� 100k� V OUT OP777 Q1 R1 = 100k� 5V R2B 2.7k� 10pF I O R2 = R2A + R2B + R2A R1 = 100� OP777 97.3k� R2 V R I = V L LOAD O S 0.1� R1 � R2B RETURN TO � GROUND R = 1mA � 11mA SENSE Figure 7. A Low-Side Load Current Monitor Figure 10. Single-Supply Current Source The OP777/OP727/OP747 is very useful in many bridge applica- A single-supply instrumentation amplifier using one OP727 tions. Figure 8 shows a single-supply bridge circuit in which its amplifier is shown in Figure 11. For true difference R3/R4 = output is linearly proportional to the fractional deviation (�) of R1/R2. The formula for the CMRR of the circuit at dc is CMRR = the bridge. Note that � = ΔR/R. 20 × log (100/(1–(R2 × R3)/(R1× R4)). It is common to specify t he accuracy of the resistor network in terms of resistor-to-resistor = 300 percentage mismatch. We can rewrite the CMRR equation to 15V AR1�V REF V = � + 2.5V reflect this CMRR = 20 × log (10000/% Mismatch). The key to O 2R2 2 high CMRR is a network of resistors that are well matched from �R1 � = 1/4 OP747 R1 the perspective of both resistive ratio and relative drift. It should 6 RG = 10k� REF 192 be noted that the absolute value of the resistors and their absolute 2 1M� 10.1k� 2.5V drift are of no consequence. Matching is the key. CMRR is 100 dB 4 3 1M� REF with 0.1% mismatched resistor network. To maximize CMRR, 0.1�F 192 15V one of the resistors such as R4 should be trimmed. Tighter match- 15V 4 3 ing of two op amps in one package (OP727) offers a significant R1(1+�) 10.1k� R1 V1 boost in performance over the triple op amp configuration. V O 1/4 OP747 R1(1+�) R1 1/4 OP747 R3 = 10.1k� R2 = 1M� R2 3.0 V TO 30V V2 3.0 V TO 30V R4 = 1M� R1 = 10.1k� Figure 8. Linear Response Bridge, Single Supply V O 1/2 OP727 In systems where dual supplies are available, the circuit of Figure V1 1/2 OP727 9 could be used to detect bridge outputs that are linearly related V2 V = 100 (V2 � V1) to the fractional deviation of the bridge. O 0.02mV V1 � V2 290mV 2mV V 29V OUT USE MATCHED RESISTORS Figure 11. Single-Supply Micropower Instrumentation Amplifier D –12– REV. OP777/OP727/OP747 OUTLINE DIMENSIONS 3.20 3.00 2.80 8 5 5.15 3.20 4.90 3.00 4.65 1 2.80 4 PIN 1 IDENTIFIER 0.65 BSC 0.95 15° MAX 0.85 1.10 MAX 0.75 0.80 0.15 0.23 6° 0.55 0.40 0.05 0.09 0° 0.40 0.25 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 12. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 5.00 (0.1968) 4.80 (0.1890) 85 6.20 (0.2441) 4.00 (0.1574) 1 5.80 (0.2284) 3.80 (0.1497) 4 0.50 (0.0196) 1.27 (0.0500) 45° BSC 1.75 (0.0688) 0.25 (0.0099) 1.35 (0.0532) 0.25 (0.0098) 8° 0.10 (0.0040) 0° 0.51 (0.0201) COPLANARITY 1.27 (0.0500) 0.10 0.31 (0.0122) 0.25 (0.0098) SEATING 0.40 (0.0157) 0.17 (0.0067) PLANE COMPLIANT TO JEDEC STANDARDS MS-012-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 13. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) REV. D –13– 10-07-2009-B 012407-A OP777/OP727/OP747 3.10 3.00 2.90 8 5 4.50 4.40 6.40 BSC 4.30 1 4 PIN 1 0.65 BSC 0.15 1.20 0.05 MAX 8° 0.30 0.75 0° COPLANARITY SEATING 0.20 0.60 0.19 0.10 PLANE 0.09 0.45 COMPLIANT TO JEDEC STANDARDS MO-153-AA Figure 14. 8-Lead Thin Shrink Small Outline Package [TSSOP] (RU-8) Dimensions shown in millimeters 8.75 (0.3445) 8.55 (0.3366) 8 14 6.20 (0.2441) 4.00 (0.1575) 1 5.80 (0.2283) 3.80 (0.1496) 7 1.27 (0.0500) 0.50 (0.0197) 45° BSC 0.25 (0.0098) 1.75 (0.0689) 0.25 (0.0098) 1.35 (0.0531) 8° 0.10 (0.0039) 0° COPLANARITY SEATING 1.27 (0.0500) 0.51 (0.0201) 0.10 PLANE 0.25 (0.0098) 0.40 (0.0157) 0.31 (0.0122) 0.17 (0.0067) COMPLIANT TO JEDEC STANDARDS MS-012-AB 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 15. 14-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-14) Dimensions shown in millimeters and (inches) –14– REV. D 060606-A OP777/OP727/OP747 5.10 5.00 4.90 14 8 4.50 6.40 4.40 BSC 4.30 1 7 PIN 1 0.65 BSC 1.05 1.20 1.00 0.20 MAX 0.80 0.09 0.75 0.15 8° 0.60 SEATING 0° 0.05 0.45 0.30 PLANE COPLANARITY 0.19 0.10 COMPLIANT TO JEDEC STANDARDS MO-153-AB-1 Figure 16. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters ORDERING GUIDE 1 Model Temperature Range Package Description Package Option Branding OP727AR –40°C to +85°C 8-Lead SOIC_N R-8 OP727AR-REEL –40°C to +85°C 8-Lead SOIC_N R-8 OP727AR-REEL7 –40°C to +85°C 8-Lead SOIC_N R-8 OP727ARUZ –40°C to +85°C 8-Lead TSSOP RU-8 OP727ARUZ-REEL –40°C to +85°C 8-Lead TSSOP RU-8 OP727ARZ –40°C to +85°C 8-Lead SOIC_N R-8 OP727ARZ-REEL –40°C to +85°C 8-Lead SOIC_N R-8 OP727ARZ-REEL7 –40°C to +85°C 8-Lead SOIC_N R-8 OP747ARU –40°C to +85°C 14-Lead TSSOP RU-14 OP747ARU-REEL –40°C to +85°C 14-Lead TSSOP RU-14 OP747ARUZ –40°C to +85°C 14-Lead TSSOP RU-14 OP747ARUZ-REEL –40°C to +85°C 14-Lead TSSOP RU-14 OP747ARZ –40°C to +85°C 14-Lead SOIC R-14 OP747ARZ-REEL –40°C to +85°C 14-Lead SOIC R-14 OP747ARZ-REEL7 –40°C to +85°C 14-Lead SOIC R-14 OP777ARMZ –40°C to +85°C 8-Lead MSOP RM-8 A1A OP777ARMZ-REEL –40°C to +85°C 8-Lead MSOP RM-8 A1A OP777ARZ –40°C to +85°C 8-Lead SOIC_N R-8 OP777ARZ-REEL –40°C to +85°C 8-Lead SOIC_N R-8 OP777ARZ-REEL7 –40°C to +85°C 8-Lead SOIC_N R-8 1 Z = RoHS Compliant Part. REV. D –15– 061908-A OP777/OP727/OP747 REVISION HISTORY 10/11—Rev. C to Rev. D Changed Single Supply Operation from 2.7 V to 30 V to 3.0 V to 30 V ...................................................................................... 1 Changed Dual Supply Operation from ±1.35 V to ±15 V to ±1.5 V to ±15 V ................................................................................. 1 Changes to General Description Section ...................................... 1 Added Similar Low Power Products Table .................................... 1 Changes to Supply Voltage Section, Input Common-Mode Voltage Range Section, and Figure 1 ............................................ 10 Changes to Figure 5 ........................................................................ 11 Changes to Figure 10 and Figure 11 ............................................. 12 Updated Outline Dimensions ....................................................... 13 Changes to Ordering Guide .......................................................... 15 9/01—Rev. B to Rev. C Addition of text to Applications Section ....................................... 1 Addition of 8-Lead SOIC (R-8) Package ....................................... 1 Addition of text to General Description ........................................ 1 Addition of package to Ordering Guide ........................................ 2 ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D02051-0-10/11(D) –16– REV. D