LT1413 Single Supply, Dual Precision Op Amp U FEATURES DESCRIPTIO Single Supply Operation: ■ Input Goes Below Ground ■ Output Swings to Ground Sinking Current ■ No Pull-Down Resistors Needed ■ Phase Reversal Protection At 5V, 0V Low Cost Grade Specifications: ■ 280µV Max Offset Voltage ■ 380µV Max in S8 Package ■ 0.8nA Max Offset Current ■ 480µA Max Supply Current per Amplifier ■ 0.5µV/°C Drift ■ 1.4 Million Voltage Gain ■ 950kHz Gain-Bandwidth Product ■ 0.55µV P-P, 0.1Hz to 10Hz Noise 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. UO APPLICATI ■ ■ ■ ■ Single Supply Systems Two and Three Op Amp Instrumentation Amplifiers Active Filters Battery-Powered Systems Strain Gauge and Bridge Amplifiers 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. UO ■ S 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. TYPICAL APPLICATI Distribution of Input Offset Voltage (In Plastic DIP, N8 Package) +90V, –3V Common-Mode Range Difference Amplifier (AV = 1) 30 10M 25 – INPUT + 2 10M 1M – 8 1/2 LT1413 3 + 1 OUTPUT 20mV TO 8V 4 1M 20 15 10 5 10M OUTPUT OFFSET = 1.5mV (INPUT REFERRED = 125µV) INPUT RESISTANCE = 11M BANDWIDTH = 80kHz PERCENT OF UNITS 9V 10M VS = 5V, 0V TA = 25°C (THE 0.1nA TYPICAL OFFSET CURRENT PERMITS THE USE OF 1MΩ RESISTORS) 0 –300 –200 –100 0 100 200 INPUT OFFSET VOLTAGE (µV) 300 LT1413 • TA03 LT1413 • TA01 1 LT1413 W W W AXI U U ABSOLUTE RATI GS Supply Voltage ..................................................... ±22V Differential Input Voltage ...................................... ±30V Input Voltage .................................................................. Equal to Positive Supply Voltage 5V Below Negative Supply Voltage 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. U W U PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER TOP VIEW OUT A 1 –IN A 2 A +IN A 3 V – B 4 8 V+ 7 OUT B 6 –IN B 5 +IN B LT1413ACN8 LT1413CN8 N8 PACKAGE 8-LEAD PLASTIC DIP TJMAX = 100°C, θJA = 130°C/ W ORDER PART NUMBER TOP VIEW +IN A 1 V– 2 A +IN B 3 8 –IN A 7 OUT A 6 V+ 5 OUT B LT1413S8 B –IN B 4 S8 PACKAGE 8-LEAD PLASTIC SOIC S8 PART MARKING NOTE: THIS PIN CONFIGURATION DIFFERS FROM THE 8-LEAD DIP PIN LOCATIONS. INSTEAD, IT FOLLOWS THE INDUSTRY STANDARD LT1013DS8 SO PACKAGE CONFIGURATION. 1413 TJMAX = 105°C, θJA = 200°C/ W ELECTRICAL CHARACTERISTICS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted. PARAMETER CONDITIONS (Note 1) VOS Input Offset Voltage LT1413N8 LT1413S8 ∆VOS ∆Time Long-Term Input Offset Voltage Stability 0.4 IOS IB en Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density in Input Noise Current Input Noise Current Density 0.1 9 0.55 24 23 2.8 0.07 0.02 Input Resistance Differential Mode Common Mode Input Voltage Range CMRR PSRR AVOL 2 Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain MIN LT1413ACN8 TYP MAX SYMBOL 50 0.1Hz to 10Hz (Note 2) fO = 10Hz (Note 2) fO = 1000Hz (Note 2) 0.1Hz to 10Hz fO = 10Hz fO = 1000Hz (Note 3) 300 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 3.65 0 90 102 400 300 500 3 3.8 – 0.3 101 118 1400 1000 LT1413CN8/S8 MIN TYP MAX UNITS 150 60 80 0.5 280 380 µV µV µV/Mo 0.7 15 1.1 38 30 0.1 9 0.55 24 23 2.8 0.07 0.02 0.8 18 nA nA 250 3.65 0 88 100 350 250 500 3 3.8 – 0.3 101 118 1400 1000 µVP-P nV/√Hz nV/√Hz pAP-P pA/√Hz pA/√Hz MΩ GΩ V V dB dB V/mV V/mV LT1413 ELECTRICAL CHARACTERISTICS SYMBOL SR GBW IS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted. PARAMETER CONDITIONS Maximum Output Voltage Swing 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) Slew Rate Gain-Bandwidth Product Supply Current per Amplifier Channel Separation Minimum Supply Voltage MIN 4.1 3.4 0.2 600 ∆VIN = 3V, RL = 2k (Note 5) (Note 6) 125 LT1413ACN8 TYP MAX 15 5 220 4.4 4.0 0.3 950 330 140 2.85 LT1413CN8/S8 MIN TYP MAX 25 10 350 3.0 mV mV mV V V V/µs kHz µA dB V LT1413CN8/S8 MIN TYP MAX UNITS 80 100 0.4 0.1 10 100 117 1100 800 18 270 4.3 3.9 350 530 µV µV µV/°C nA nA dB dB V/mV V/mV mV mV V V µA 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 4.1 3.4 0.2 600 450 123 3.0 15 5 220 4.4 4.0 0.3 950 330 140 2.85 25 10 350 UNITS 480 VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 1) VOS Input Offset Voltage ∆VOS /∆T IOS IB CMRR PSRR AVOL Input Offset Voltage Drift Input Offset Current Input Bias Current Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain LT1413N8 LT1413S8 (Note 5) Maximum Output Voltage Swing IS MIN ● ● 65 240 ● 0.3 0.1 10 100 117 1100 800 18 270 4.3 3.9 350 2.0 1.0 20 ● ● 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 Supply Current per Amplifier LT1413ACN8 TYP MAX ● ● ● ● ● ● ● ● 88 100 300 200 4.0 3.3 ● 85 97 300 200 32 430 4.0 3.2 500 390 490 2.5 1.2 23 32 430 VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, – 40°C ≤ TA ≤ 85°C (Note 7) SYMBOL VOS PARAMETER Input Offset Voltage ∆VOS /∆T IOS IB CMRR PSRR AVOL 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 IS Supply Current per Amplifier CONDITIONS (Note 1) LT1413N8 LT1413S8 MIN ● ● ● ● ● 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 ● ● ● ● ● ● ● ● ● 85 98 220 150 3.9 3.1 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 38 480 550 3 LT1413 ELECTRICAL CHARACTERISTICS VS = ±15V, TA = 25°C, unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 1) VOS Input Offset Voltage LT1413N8 LT1413S8 IOS IB Input Offset Current Input Bias Current Input Voltage Range CMRR PSRR AVOL VOUT SR IS Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Slew Rate Supply Current per Amplifier 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 VCM = 13.5V, – 15V VS = ±2V to ±18V VO = ±10V, RL = 2k RL = 2k 280 0.7 15 500 LT1413CN8/S8 MIN TYP MAX UNITS 550 µV µV nA nA V V dB dB V/mV V V/µs µA LT1413CN8/S8 MIN TYP MAX UNITS 110 130 0.5 0.1 9 3000 113 116 ±13.9 360 600 µV µV µV/°C nA nA V/mV dB dB V µA LT1413CN8/S8 MIN TYP MAX UNITS µV µV µV/°C nA nA V/mV 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 VS = ±15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 1) VOS Input Offset Voltage ∆VOS /∆T IOS IB AVOL CMRR PSRR 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 LT1413N8 LT1413S8 (Note 5) IS MIN LT1413ACN8 TYP MAX ● ● 95 390 ● 0.4 0.1 9 4000 116 119 ±13.9 360 2.5 1.0 20 ● ● VO = ±10V, RL = 2k VCM = 13V, – 15V VS = ±2V to ±18V RL = 2k ● ● ● ● 1000 98 101 ±12.5 ● 700 94 97 ±12.0 550 620 720 3.0 1.2 23 VS = ±15V, – 40°C ≤ TA ≤ 85°C (Note 7) SYMBOL PARAMETER CONDITIONS (Note 1) VOS Input Offset Voltage LT1413N8 LT1413S8 ∆VOS /∆T IOS IB AVOL Input Offset Voltage Drift Input Offset Current Input Bias Current Large-Signal Voltage Gain VO = ±10V, RL = 2k ● CMRR Common-Mode Rejection Ratio VCM = 13V, – 15V ● PSRR Power Supply Rejection Ratio Maximum Output Voltage Swing Supply Current per Amplifier VS ±2V to ±18V RL = 2k ● IS LT1413ACN8 TYP MAX ● ● 100 460 ● 2.8 1.4 25 800 0.4 0.2 10 3000 500 120 140 0.5 0.2 10 2400 97 115 92 112 dB 100 ±12.2 118 ±13.8 370 95 ±11.8 115 ±13.8 370 dB V µA ● ● The ● 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. 4 MIN ● ● 580 700 800 3.3 1.7 30 630 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. LT1413 U W TYPICAL PERFOR A CE CHARACTERISTICS Distribution of Input Offset Voltage (In S8 Package) Output Saturation vs Sink Current vs Temperature Supply Current vs Temperature 10 30 20 15 10 5 0 –400 –300 –200 –100 0 100 200 300 400 INPUT OFFSET VOLTAGE (µV) V + = 5V TO 30V V – = 0V 400 VS = ± 15V 350 ISINK = 10mA SATURATION VOLTAGE (V) PERCENT OF UNITS 25 SUPPLY CURRENT PER AMPLIFIER (µA) VS = 5V, 0V TA = 25°C VS = 5V, 0V 1 ISINK = 5mA ISINK = 1mA 0.1 ISINK = 100µA – 50 –25 0 50 25 TEMPERATURE (°C) LT1413 • TA02 75 0.01 –50 100 ISINK = 0 –25 0 25 50 TEMPERATURE (°C) Input Bias Current vs Common-Mode Voltage Input Bias Current vs Temperature 250 15 5 TA = 25°C INPUT BIAS CURRENT (nA) 150 VS = ±15V 100 50 VS = 5V, 0V VCM = 0.1V –10 –9 VS = ± 15V –8 10 VS = ± 15V 4 COMMON-MODE VOLTAGE (V) VS = 5V, 0V VCM = 0.1V COMMON-MODE VOLTAGE (V) –11 200 100 75 LT1413 • TA05 LT1413 • TA04 Input Offset Current vs Temperature INPUT OFFSET CURRENT (pA) ISINK = 10µA 300 VS = 5V, 0V 5 3 0 2 –5 1 –10 0 –7 0 –40 –15 40 0 20 60 TEMPERATURE (°C) –20 80 – 40 100 –20 40 0 20 60 TEMPERATURE (°C) 80 100 0 0.1Hz to 10Hz Noise LT1413 • TA08 Noise Spectrum Minimum Supply Voltage 200 1000 300 100 CURRENT NOISE VOLTAGE NOISE 30 8 10 LT1413 • TA09 TA = – 40°C TA = 0°C 100 TA = 25°C TA = 85°C 0 1/f CORNER 2Hz 10 4 6 TIME (SECONDS) V – = 0V NONFUNCTIONAL TA = 25°C VS = ±2V TO ±18V CHANGE IN OFFSET VOLTAGE (µV) NOISE VOLTAGE (200nV/DIV) VOLTAGE NOISE DENSITY (nV/√Hz) CURRENT NOISE DENSITY (fA /√Hz) TA = 25°C VS = ±2V TO ±18V 2 –1 – 4 – 6 – 8 –10 –12 –14 –16 INPUT BIAS CURRENT (nA) LT1413 • TA07 LT1413 • TA06 0 –2 1 10 100 FREQUENCY (Hz) 1k LT1413 • TA10 2 3 4 POSITIVE SUPPLY VOLTAGE (V) 5 LT1413 • TA11 5 LT1413 U W TYPICAL PERFOR A CE CHARACTERISTICS Voltage Gain vs Frequency Channel Separation vs Frequency Gain, Phase vs Frequency 140 20 VOLTAGE GAIN (dB) 80 60 VS = ± 15V 40 VS = 5V, 0V 20 120 ±15V 140 10 ±15V GAIN 0 5V, 0V 160 180 5V, 0V 200 0 TA = 25°C VS = 5V, 0V VIN = 3Vp-p RL = 2k 100 PHASE SHIFT (DEGREES) PHASE 100 140 LIMITED BY THERMAL INTERACTION 120 RS = 1kΩ 100 80 LIMITED BY PIN TO PIN CAPACITANCE –10 – 20 0.01 0.1 60 1 0.1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 0.3 3 1 FREQUENCY (MHz) 10 10 Common-Mode Rejection Ratio vs Frequency 120 POWER SUPPLY REJECTION RATIO (dB) VS = ±15V 80 VS = 5V, 0V 60 40 20 0 100 1k 10k FREQUENCY (Hz) 100k 1M VS = 5V, 0V 100k 1M Small Signal Transient Response, VS = ±15V 120 100 1k 10k FREQUENCY (Hz) LT1413 • TA14 Power Supply Rejection Ratio vs Frequency TA = 25°C 100 LT1413 • TA13 LT1413 • TA12 10 RS = 100Ω TA = 25°C 100 NEGATIVE SUPPLY ±15V 80 POSITIVE SUPPLY ± 15V 20mV/DIV VOLTAGE GAIN (dB) TA = 25°C VCM = 0.1V CL = 100pF CHANNEL SEPARATION (dB) 120 COMMON-MODE REJECTION RATIO (dB) 160 80 TA = 25°C CL = 100pF 60 40 20 AV = +1 0 0.1 2µs/DIV LT1413 • TA17 1 10 100 1k 10k 100k FREQUENCY (Hz) LT1413 • TA15 1M LT1413 • TA16 Small Signal Transient Response, VS = 5V, 0V Large Signal Transient Response, VS = 5V, 0V Large Signal Transient Response, VS = ±15V 5V/DIV 50mV/DIV 4V 2V 0V 0V AV = +1 20µs/DIV INPUT = 20mV TO 220mV PULSE LT1413 • TA18 6 AV = +1 NO LOAD INPUT = 0V TO 4V PULSE 10µs/DIV LT1413 • TA19 AV = +1 50µs/DIV LT1413 • TA20 LT1413 U W U U 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. 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. 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 Gain 100 Amplifier Voltage Follower 5V 5V 99R R – – 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. Voltage Follower with Input Exceeding the Negative Common-Mode Range 4V 2V 4V 4V 2V 2V 0V 0V 0V 6VP-P INPUT, –1.5V TO 4.5V LT1413 • TA21 LM324, LM358, OP-221 EXHIBIT OUTPUT PHASE REVERSAL LT1413 NO PHASE REVERSAL LT1413 • TA22 Comparator Rise Response Time 10mV, 5mV, 2mV Overdrives 4 OUTPUT (V) 2 0 INPUT (mV) OUTPUT (V) 4 INPUT (mV) LT1413 • TA23 Comparator Fall Response Time to 10mV, 5mV, 2mV Overdrives 0 2 0 100 0 –100 VS = 5V, 0V 50µs/DIV LT1413 • TA24 VS = 5V, 0V 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. 50µs/DIV LT1413 • TA25 7 LT1413 W W SIMPLIFIED SCHEMATIC 1/2 LT1413 V+ 1k 3.5µA 3.5µA 11µA 10µA 11µA 800Ω 80µA Q36 Q32 Q35 Q30 Q3 Q6 Q4 V– J1 Q5 Q25 3.9k Q27 Q1 400Ω IN – Q33 21pF Q26 2.5pF Q17 2.4k 18Ω 16k Q16 Q21 OUTPUT Q2 Q28 600Ω 400Ω Q18 IN+ Q22 4pF Q12 Q10 Q29 Q31 Q19 Q11 75pF V– Q14 Q15 100pF Q24 Q8 Q9 Q34 2k 10pF Q7 5k 5k 30Ω 15µA 18µA 48k 600Ω 600Ω 15µA LT1413 • TA26 U PACKAGE DESCRIPTION 0.300 – 0.320 (7.620 – 8.128) N8 Package, 8-Lead Plastic DIP 0.045 – 0.065 (1.143 – 1.651) 0.400 (10.160) MAX 0.130 ± 0.005 (3.302 ± 0.127) 8 0.009 – 0.015 (0.229 – 0.381) ( +0.025 0.325 –0.015 +0.635 8.255 –0.381 7 0.125 (3.175) MIN 0.045 ± 0.015 (1.143 ± 0.381) ) 0.100 ± 0.010 (2.540 ± 0.254) 0.250 ± 0.010 (6.350 ± 0.254) 1 0.018 ± 0.003 (0.457 ± 0.076) 2 0.053 – 0.069 (1.346 – 1.752) 0.008 – 0.010 (0.203 – 0.254) 4 N8 0392 7 6 5 0.004 – 0.010 (0.101 – 0.254) 0.228 – 0.244 (5.791 – 6.197) 0.014 – 0.019 (0.355 – 0.483) 0.150 – 0.157 (3.810 – 3.988) 0.050 (1.270) BSC 1 8 3 0.189 – 0.197 (4.801 – 5.004) 8 0.016 – 0.050 0.406 – 1.270 5 0.020 (0.508) MIN S8 Package, 8-Lead Plastic SOIC 0.010 – 0.020 × 45° (0.254 – 0.508) 0°– 8° TYP 6 0.065 (1.651) TYP Linear Technology Corporation 2 3 4 SO8 0392 BA/GP 1193 10K REV 0 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977 LINEAR TECHNOLOGY CORPORATION 1993