LT1413

LT1413 Single Supply, Dual Precision Op Amp FEATURES Single Supply Operation: s Input Goes Below Ground s Output Swings to Ground Sinking Current s No Pull-Down Resistors Needed s Phase Reversal Protection At 5V, 0V Low Cost Grade Specifications: s 280µV Max Offset Voltage s 380µV Max in S8 Package s 0.8nA Max Offset Current s 480µA Max Supply Current per Amplifier s 0.5µV/°C Drift s 1.4 Million Voltage Gain s 950kHz Gain-Bandwidth Product s 0.55µV P-P, 0.1Hz to 10Hz Noise DESCRIPTIO The LT1413 is a low cost, upgraded version of Linear Technology’s industry standard LT1013 dual, single supply op amp. The LT1413 is optimized for single 5V applications, although ± 15V specifications are also provided for completeness. In the design of the LT1413, particular emphasis has been placed on low cost plastic and SO-8 package performance: 60µV offset voltage, 0.1nA offset current, in excess of 10mA output current at 330µA supply current and 140dB channel separation are some of the specifications achieved. Other dual, single supply amplifiers are available to complement the LT1413 family: the micropower LT1078’s supply current is 10 times lower with a 4.5 fold speed performance degradation compared to the LT1413. Conversely, the LT1211, LT1213 and LT1215 duals have 4 to 14 times higher supply current, but also 13 to 50 times higher speed. Protected by U.S. Patent 4,775,884. APPLICATI s s s s s S Single Supply Systems Two and Three Op Amp Instrumentation Amplifiers Active Filters Battery-Powered Systems Strain Gauge and Bridge Amplifiers TYPICAL APPLICATI +90V, –3V Common-Mode Range Difference Amplifier (AV = 1) 30 10M 9V 25 Distribution of Input Offset Voltage (In Plastic DIP, N8 Package) VS = 5V, 0V TA = 25°C – INPUT – + 8 1 OUTPUT 20mV TO 8V PERCENT OF UNITS 10M 2 1M 1M 20 15 10 5 + 10M 1/2 LT1413 3 4 10M OUTPUT OFFSET = 1.5mV (INPUT REFERRED = 125µV) INPUT RESISTANCE = 11M BANDWIDTH = 80kHz (THE 0.1nA TYPICAL OFFSET CURRENT PERMITS THE USE OF 1MΩ RESISTORS) LT1413 • TA03 0 –300 –200 –100 0 100 200 INPUT OFFSET VOLTAGE (µV) U 300 LT1413 • TA01 UO UO 1 LT1413 ABSOLUTE AXI U RATI GS Output Short-Circuit Duration ......................... Indefinite Operating Temperature Range ............... – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C Note: When the input voltage exceeds the maximum ratings, the input current should be limited to 10mA. Supply Voltage ..................................................... ± 22V Differential Input Voltage ...................................... ± 30V Input Voltage .................................................................. Equal to Positive Supply Voltage 5V Below Negative Supply Voltage PACKAGE/ORDER I FOR ATIO TOP VIEW OUT A 1 –IN A 2 +IN A 3 V – ORDER PART NUMBER 8 V+ OUT B –IN B +IN B 7 A B 6 5 LT1413ACN8 LT1413CN8 4 N8 PACKAGE 8-LEAD PLASTIC DIP TJMAX = 100°C, θJA = 130°C/ W ELECTRICAL CHARACTERISTICS SYMBOL VOS ∆VOS ∆Time IOS IB en PARAMETER Input Offset Voltage Long-Term Input Offset Voltage Stability Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Input Noise Current Density Input Resistance Differential Mode Common Mode Input Voltage Range CMRR PSRR AVOL Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain LT1413N8 LT1413S8 VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted. MIN LT1413ACN8 TYP MAX 50 0.4 0.1 9 0.55 24 23 2.8 0.07 0.02 300 3.65 0 90 102 400 300 500 3 3.8 – 0.3 101 118 1400 1000 0.7 15 1.1 38 30 150 LT1413CN8/S8 MIN TYP MAX 60 80 0.5 0.1 9 0.55 24 23 2.8 0.07 0.02 250 3.65 0 88 100 350 250 500 3 3.8 – 0.3 101 118 1400 1000 280 380 UNITS µV µV µV/Mo nA nA µVP-P nV/√Hz nV/√Hz pAP-P pA/√Hz pA/√Hz MΩ GΩ V V dB dB V/mV V/mV CONDITIONS (Note 1) in 0.1Hz to 10Hz (Note 2) fO = 10Hz (Note 2) fO = 1000Hz (Note 2) 0.1Hz to 10Hz fO = 10Hz fO = 1000Hz (Note 3) VCM = 0V to 3.65V VS = 3.2V to 12V VO = 0.05V to 4V, No Load VO = 0.05V to 3.5V, RL = 2k 2 U U W WW U W TOP VIEW +IN A 1 V– 2 +IN B 3 B –IN B 4 5 OUT B S8 PACKAGE 8-LEAD PLASTIC SOIC NOTE: THIS PIN CONFIGURATION DIFFERS FROM THE 8-LEAD DIP PIN LOCATIONS. INSTEAD, IT FOLLOWS THE INDUSTRY STANDARD LT1013DS8 SO PACKAGE CONFIGURATION. TJMAX = 105°C, θJA = 200° C/ W 8 A 7 6 –IN A OUT A V+ ORDER PART NUMBER LT1413S8 S8 PART MARKING 1413 0.8 18 LT1413 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Maximum Output Voltage Swing CONDITIONS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted. MIN LT1413ACN8 TYP MAX 15 5 220 4.4 4.0 0.3 950 330 140 2.85 25 10 350 4.1 3.4 0.2 600 450 123 3.0 LT1413CN8/S8 MIN TYP MAX 15 5 220 4.4 4.0 0.3 950 330 140 2.85 25 10 350 UNITS mV mV mV V V V/µs kHz µA dB V SR GBW IS Slew Rate Gain-Bandwidth Product Supply Current per Amplifier Channel Separation Minimum Supply Voltage Output Low, No Load Output Low, 600Ω to GND Output Low, ISINK = 1mA Output High, No Load Output High, 600Ω to GND AV = 1 fO ≤ 100kHz (Note 4) ∆VIN = 3V, RL = 2k (Note 5) (Note 6) 4.1 3.4 0.2 600 125 480 3.0 VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. SYMBOL VOS ∆VOS /∆T IOS IB CMRR PSRR AVOL PARAMETER Input Offset Voltage Input Offset Voltage Drift Input Offset Current Input Bias Current Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing CONDITIONS (Note 1) LT1413N8 LT1413S8 (Note 5) q q q q q MIN LT1413ACN8 TYP MAX 65 0.3 0.1 10 100 117 1100 800 18 270 4.3 3.9 350 240 2.0 1.0 20 LT1413CN8/S8 MIN TYP MAX 80 100 0.4 0.1 10 100 117 1100 800 18 270 4.3 3.9 350 390 490 2.5 1.2 23 UNITS µV µV µV/°C nA nA dB dB V/mV V/mV mV mV V V µA VCM = 0V to 3.6V VS = 3.45V to 12V VO = 0.07V to 3.9V, No Load VO = 0.07V to 3.2V, RL = 2k Output Low, No Load Output Low, ISINK = 1mA Output High, No Load Output High, 600Ω to GND q q q q q q q q q 88 100 300 200 85 97 300 200 32 430 4.0 3.2 500 32 430 4.0 3.3 IS Supply Current per Amplifier 530 VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, – 40°C ≤ TA ≤ 85°C (Note 7) SYMBOL VOS ∆VOS /∆T IOS IB CMRR PSRR AVOL PARAMETER Input Offset Voltage Input Offset Voltage Drift Input Offset Current Input Bias Current Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing CONDITIONS (Note 1) LT1413N8 LT1413S8 MIN q q q q q LT1413ACN8 TYP MAX 70 300 0.3 0.2 11 99 116 1000 700 20 300 4.2 3.8 360 2.2 1.4 25 VCM = 0V to 3.4V VS = 3.9V to 12V VO = 0.08V to 3.8V, No Load VO = 0.08V to 3.0V, RL = 2k Output Low, No Load Output Low, ISINK = 1mA Output High, No Load Output High, 600Ω to GND q q q q q q q q q 85 98 220 150 38 480 3.9 3.1 IS Supply Current per Amplifier 550 LT1413CN8/S8 MIN TYP MAX 85 470 110 570 0.4 2.8 0.2 1.7 11 30 82 99 94 116 220 1000 150 700 20 38 300 480 3.9 4.2 3.0 3.8 360 580 UNITS µV µV µV/°C nA nA dB dB V/mV V/mV mV mV V V µA 3 LT1413 ELECTRICAL CHARACTERISTICS VS = ±15V, TA = 25°C, unless otherwise noted. SYMBOL VOS IOS IB PARAMETER Input Offset Voltage Input Offset Current Input Bias Current Input Voltage Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Slew Rate Supply Current per Amplifier VCM = 13.5V, – 15V VS = ± 2V to ± 18V VO = ± 10V, RL = 2k RL = 2k CONDITIONS (Note 1) LT1413N8 LT1413S8 MIN LT1413ACN8 TYP MAX 75 0.1 8 13.5 13.8 – 15.0 – 15.3 100 117 103 120 1500 5000 ± 13 ± 14 0.2 0.4 350 280 0.7 15 LT1413CN8/S8 MIN TYP MAX 90 110 0.1 8 13.5 13.8 – 15.0 – 15.3 97 114 100 117 1200 4000 ± 12.5 ± 14 0.2 0.4 350 480 580 0.8 18 UNITS µV µV nA nA V V dB dB V/mV V V/µs µA CMRR PSRR AVOL VOUT SR IS 500 550 VS = ± 15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. SYMBOL VOS ∆VOS /∆T IOS IB AVOL CMRR PSRR IS PARAMETER Input Offset Voltage Input Offset Voltage Drift Input Offset Current Input Bias Current Large-Signal Voltage Gain Common-Mode Rejection Ratio Power Supply Rejection Ratio Maximum Output Voltage Swing Supply Current per Amplifier CONDITIONS (Note 1) LT1413N8 LT1413S8 (Note 5) q q q q q MIN LT1413ACN8 TYP MAX 95 0.4 0.1 9 4000 116 119 ± 13.9 360 390 2.5 1.0 20 LT1413CN8/S8 MIN TYP MAX 110 130 0.5 0.1 9 3000 113 116 ± 13.9 360 620 720 3.0 1.2 23 UNITS µV µV µV/°C nA nA V/mV dB dB V µA VO = ± 10V, RL = 2k VCM = 13V, – 15V VS = ± 2V to ± 18V RL = 2k q q q q q 1000 98 101 ± 12.5 700 94 97 ± 12.0 550 600 VS = ± 15V, – 40°C ≤ TA ≤ 85°C (Note 7) SYMBOL VOS ∆VOS /∆T IOS IB AVOL CMRR PSRR IS PARAMETER Input Offset Voltage Input Offset Voltage Drift Input Offset Current Input Bias Current Large-Signal Voltage Gain Common-Mode Rejection Ratio Power Supply Rejection Ratio Maximum Output Voltage Swing Supply Current per Amplifier CONDITIONS (Note 1) LT1413N8 LT1413S8 q q q q q MIN LT1413ACN8 TYP MAX 100 0.4 0.2 10 3000 115 118 ± 13.8 370 460 2.8 1.4 25 LT1413CN8/S8 MIN TYP MAX 120 140 0.5 0.2 10 2400 112 115 ± 13.8 370 700 800 3.3 1.7 30 UNITS µV µV µV/°C nA nA V/mV dB dB V µA VO = ± 10V, RL = 2k VCM = 13V, – 15V VS ± 2V to ± 18V RL = 2k q q q q q 800 97 100 ± 12.2 500 92 95 ± 11.8 580 630 The q denotes specifications which apply over the full operating temperature range. Note 1: Typical parameters are defined as the 60% yield of parameter distributions of individual amplifiers; i.e., out of 100 LT1413s typically 120 op amps will be better than the indicated specification. Note 2: This parameter is tested on a sample basis only. All noise parameters are tested with VS = ± 2.5V, VO = 0V. Note 3: This parameter is guaranteed by design and is not tested. Note 4: Gain-Bandwidth Product is not tested. It is inferred from the slew rate measurement. Note 5: This parameter is not 100% tested. Note 6: At the minimum supply voltage, the offset voltage changes less than 200µV compared to its value at 5V, 0V. Note 7: The LT1413 is not tested and is not quality-assurance sampled at – 40°C and at 85°C. These specifications are guaranteed by design, correlation and/or inference from 0°C, 25°C and/or 70°C tests. 4 LT1413 TYPICAL PERFOR A CE CHARACTERISTICS Distribution of Input Offset Voltage (In S8 Package) 30 SUPPLY CURRENT PER AMPLIFIER (µA) 25 VS = 5V, 0V TA = 25°C 20 15 10 5 0 –400 –300 –200 –100 0 100 200 300 400 INPUT OFFSET VOLTAGE (µV) LT1413 • TA02 SATURATION VOLTAGE (V) PERCENT OF UNITS Input Offset Current vs Temperature 250 –11 COMMON-MODE VOLTAGE (V) INPUT OFFSET CURRENT (pA) VS = 5V, 0V VCM = 0.1V 150 VS = ±15V INPUT BIAS CURRENT (nA) 200 100 50 0 –40 –20 40 0 20 60 TEMPERATURE (°C) 0.1Hz to 10Hz Noise 1000 VOLTAGE NOISE DENSITY (nV/ √Hz) CURRENT NOISE DENSITY (fA / √Hz) CHANGE IN OFFSET VOLTAGE (µV) TA = 25°C VS = ±2V TO ±18V NOISE VOLTAGE (200nV/DIV) 0 2 4 6 TIME (SECONDS) UW 80 LT1413 • TA06 Supply Current vs Temperature 10 400 Output Saturation vs Sink Current vs Temperature V + = 5V TO 30V V – = 0V ISINK = 10mA 1 ISINK = 5mA ISINK = 1mA 0.1 ISINK = 100µA ISINK = 10µA ISINK = 0 –25 0 25 50 TEMPERATURE (°C) 75 100 350 VS = ± 15V VS = 5V, 0V 300 – 50 –25 0 50 25 TEMPERATURE (°C) 75 100 0.01 –50 LT1413 • TA04 LT1413 • TA05 Input Bias Current vs Temperature 15 10 5 0 –5 –10 –15 Input Bias Current vs Common-Mode Voltage 5 TA = 25°C VS = ± 15V 4 VS = 5V, 0V 3 2 1 0 –1 – 4 – 6 – 8 –10 –12 –14 –16 INPUT BIAS CURRENT (nA) LT1413 • TA08 COMMON-MODE VOLTAGE (V) –10 VS = 5V, 0V VCM = 0.1V –9 VS = ± 15V –8 –7 100 – 40 –20 40 0 20 60 TEMPERATURE (°C) 80 100 0 –2 LT1413 • TA07 Noise Spectrum 200 TA = 25°C VS = ±2V TO ±18V 300 Minimum Supply Voltage NONFUNCTIONAL TA = – 40°C 100 TA = 0°C TA = 25°C TA = 85°C V – = 0V 100 CURRENT NOISE VOLTAGE NOISE 30 0 1/f CORNER 2Hz 10 1 10 100 FREQUENCY (Hz) 1k LT1413 • TA10 8 10 LT1413 • TA09 2 3 4 POSITIVE SUPPLY VOLTAGE (V) 5 LT1413 • TA11 5 LT1413 TYPICAL PERFOR A CE CHARACTERISTICS Voltage Gain vs Frequency 140 120 100 TA = 25°C CL = 100pF 120 140 160 80 60 40 20 0 – 20 0.01 0.1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) LT1413 • TA12 ±15V 10 GAIN 0 ±15V 5V, 0V CHANNEL SEPARATION (dB) VOLTAGE GAIN (dB) VOLTAGE GAIN (dB) VS = ± 15V VS = 5V, 0V Common-Mode Rejection Ratio vs Frequency 120 COMMON-MODE REJECTION RATIO (dB) POWER SUPPLY REJECTION RATIO (dB) TA = 25°C 100 VS = ± 15V 80 60 40 20 0 10 100 1k 10k FREQUENCY (Hz) 100k 1M VS = 5V, 0V 80 60 40 20 0 0.1 20mV/DIV Small Signal Transient Response, VS = 5V, 0V 50mV/DIV 2V 0V 0V AV = +1 20µs/DIV INPUT = 20mV TO 220mV PULSE LT1413 • TA18 AV = +1 NO LOAD INPUT = 0V TO 4V PULSE 10µs/DIV LT1413 • TA19 5V/DIV 6 UW LT1413 • TA15 Gain, Phase vs Frequency 80 20 PHASE TA = 25°C VCM = 0.1V CL = 100pF 100 140 160 Channel Separation vs Frequency TA = 25°C VS = 5V, 0V VIN = 3Vp-p RL = 2k LIMITED BY THERMAL INTERACTION RS = 1kΩ RS = 100Ω PHASE SHIFT (DEGREES) 120 5V, 0V 180 200 100 80 –10 60 LIMITED BY PIN TO PIN CAPACITANCE 10 100 1k 10k FREQUENCY (Hz) 100k 1M 0.1 0.3 3 1 FREQUENCY (MHz) 10 LT1413 • TA13 LT1413 • TA14 Power Supply Rejection Ratio vs Frequency 120 VS = 5V, 0V 100 NEGATIVE SUPPLY ±15V POSITIVE SUPPLY ± 15V TA = 25°C Small Signal Transient Response, VS = ±15V AV = +1 2µs/DIV LT1413 • TA17 1 10 100 1k 10k 100k FREQUENCY (Hz) 1M LT1413 • TA16 Large Signal Transient Response, VS = 5V, 0V Large Signal Transient Response, VS = ±15V 4V AV = +1 50µs/DIV LT1413 • TA20 LT1413 APPLICATIONS INFORMATION Single Supply Operation The LT1413 is fully specified for single supply operation, i.e., when the negative supply is 0V. Input common-mode range includes ground; the output swings within a few millivolts of ground. If the input is more than a few hundred millivolts below ground, two distinct problems can occur on previous single supply designs, such as the LM124, LM158, OP-21 and OP-221. a) When the input is more than a diode drop below ground, unlimited current will flow from the substrate (V– terminal) to the input. This can destroy the unit. On the LT1413, the 400Ω resistors, in series with the input (see Schematic Diagram), protect the devices even when the input is 5V below ground. b) When the input is more than 400mV below ground (at 25°C), the input stage saturates (transistors Q3 and Q4) and phase reversal occurs at the output. This can cause lock-up in servo systems. Due to a unique phase reversal protection circuitry (Q21, Q22, Q27, Q28), the LT1413 outputs do not reverse, as illustrated below, even when the inputs are at –1.5V. Keep the output of the other amplifier out of negative saturation for the phase reversal protection to function properly. Since the output of the LT1413 cannot go exactly to ground, but can only approach ground to within a few millivolts, care should be exercised to ensure that the output is not saturated. For example, a 1mV input signal will cause the amplifier to set up in its linear region in the gain 100 configuration shown below, but is not enough to make the amplifier function properly in the voltage-follower mode. Gain 100 Amplifier 5V R 99R Voltage Follower with Input Exceeding the Negative Common-Mode Range 4V 4V 4V 2V 2V 0V 0V 6VP-P INPUT, –1.5V TO 4.5V LT1413 • TA21 LM324, LM358, OP-221 EXHIBIT OUTPUT PHASE REVERSAL LT1413 • TA22 Comparator Rise Response Time 10mV, 5mV, 2mV Overdrives 4 OUTPUT (V) OUTPUT (V) 4 2 INPUT (mV) 0 INPUT (mV) 0 –100 VS = 5V, 0V 50µs/DIV LT1413 • TA24 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U W U U Voltage Follower 5V – 100mV – 1mV 1mV + + OUTPUT SATURATED ≈ 15mV LT1413 • 27 Figure 1. Comparator Applications The single supply operation of the LT1413 lends itself to its use as a precision comparator with TTL compatible output; the response time is shown below. 2V 0V LT1413 NO PHASE REVERSAL LT1413 • TA23 Comparator Fall Response Time to 10mV, 5mV, 2mV Overdrives 2 0 100 0 VS = 5V, 0V 50µs/DIV LT1413 • TA25 7 LT1413 SIMPLIFIED SCHEMATIC 1/2 LT1413 V+ 3.5µA 3.5µA 11µA 10µA 11µA 80µA Q32 Q30 Q3 Q4 3.9k Q5 Q25 Q33 21pF 2.5pF 2.4k Q26 18Ω 16k Q16 OUTPUT Q2 400Ω IN+ Q22 Q28 Q18 Q12 Q29 Q11 Q8 Q9 V– 75pF Q7 5k 5k 10pF 15µA 18µA 15µA LT1413 • TA26 Q1 400Ω IN – Q21 Q27 PACKAGE DESCRIPTION 0.300 – 0.320 (7.620 – 8.128) 0.009 – 0.015 (0.229 – 0.381) 0.065 (1.651) TYP 0.125 (3.175) MIN 0.020 (0.508) MIN 1 2 3 4 ( +0.025 0.325 –0.015 +0.635 8.255 –0.381 ) 0.045 ± 0.015 (1.143 ± 0.381) 0.100 ± 0.010 (2.540 ± 0.254) 0.010 – 0.020 × 45° (0.254 – 0.508) 0.053 – 0.069 (1.346 – 1.752) 0.008 – 0.010 (0.203 – 0.254) 0.016 – 0.050 0.406 – 1.270 0°– 8° TYP 0.014 – 0.019 (0.355 – 0.483) 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977 U W W 1k 800Ω Q36 Q35 Q6 J1 V– Q17 600Ω 4pF Q19 2k 100pF Q24 30Ω 48k 600Ω 600Ω Q31 Q34 Q14 Q15 Q10 N8 Package, 8-Lead Plastic DIP 0.045 – 0.065 (1.143 – 1.651) 0.130 ± 0.005 (3.302 ± 0.127) 8 0.400 (10.160) MAX 7 6 5 0.250 ± 0.010 (6.350 ± 0.254) 0.018 ± 0.003 (0.457 ± 0.076) N8 0392 S8 Package, 8-Lead Plastic SOIC 8 0.004 – 0.010 (0.101 – 0.254) 0.228 – 0.244 (5.791 – 6.197) 0.050 (1.270) BSC 1 0.189 – 0.197 (4.801 – 5.004) 7 6 5 0.150 – 0.157 (3.810 – 3.988) 2 3 4 SO8 0392 BA/GP 1193 10K REV 0 • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1993