LT1637 1.1MHz, 0.4V/µs Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp DESCRIPTIO U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Operates with Inputs Above V + Rail-to-Rail Input and Output Micropower: 250µA Supply Current Max Operating Temperature Range: – 40°C to 125°C Gain-Bandwidth Product: 1.1MHz Slew Rate: 0.4V/µs Low Input Offset Voltage: 350µV Max Single Supply Input Range: – 0.4V to 44V High Output Current: 25mA Min Specified on 3V, 5V and ±15V Supplies Output Shutdown Output Drives 4700pF with Output Compensation Reverse Battery Protection to 25V High Voltage Gain: 800V/mV High CMRR: 110dB U APPLICATIO S ■ ■ ■ ■ Battery or Solar Powered Systems: Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring MUX Amplifiers 4mA to 25mA Transmitters The LT1637 has a unique input stage that operates and remains high impedance when above the positive supply. The inputs take 44V both differential and common mode, even when operating on a 3V supply. Built-in resistors protect the inputs for faults below the negative supply up to 22V. There is no phase reversal of the output for inputs 5V below VEE or 44V above VEE, independent of VCC. The LT1637 op amp is available in the 8-pin MSOP, PDIP and SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a trademark of Linear Technology Corporation. U ■ The LT®1637 is a rugged op amp that operates on all single and split supplies with a total voltage of 2.7V to 44V. The LT1637 has a gain-bandwidth product of 1.1MHz while drawing less than 250µA of quiescent current. The LT1637 can be shut down, making the output high impedance and reducing the quiescent current to only 3µA. The LT1637 is reverse supply protected: it draws virtually no current for reverse supply up to 25V. The input range of the LT1637 includes both supplies and the output swings to both supplies. Unlike most micropower op amps, the LT1637 can drive heavy loads; its rail-to-rail output drives 25mA. The LT1637 is unity-gain stable into all capacitive loads up to 4700pF when optional 0.22µF and 150Ω compensation is used. TYPICAL APPLICATIO Over-The-TopTM Current Source with Shutdown Switchable Precision Current Source 4V TO 44V + 4.7µF LT1004-1.2 2k VSHDN R 4V 2V R* + 0V LT1637 TP0610 – IOUT SHDN Current Source Timing 6V IOUT = 1.2 R e.g., 10mA = 120Ω *OPTIONAL FOR LOW OUTPUT CURRENTS, R* = R 1637 TA01 10mA IOUT 5mA 0mA 100µs/DIV 1637 TA01b 1 LT1637 U W W W ABSOLUTE AXI U RATI GS (Note 1) Total Supply Voltage (V + to V –) .............................. 44V Input Differential Voltage ......................................... 44V Input Current ...................................................... ±25mA Shutdown Pin Voltage Above V – ..................................... 32V Shutdown Pin Current ........................................ ±10mA Output Short-Circuit Duration (Note 2) ......... Continuous Operating Temperature Range (Note 3) LT1637C/LT1637I .............................. – 40°C to 85°C LT1637H .......................................... – 40°C to 125°C Specified Temperature Range (Note 4) LT1637C/LT1637I .............................. – 40°C to 85°C LT1637H .......................................... – 40°C to 125°C Junction Temperature ........................................... 150°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C U W U PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER LT1637CMS8 TOP VIEW NULL – IN + IN V– 1 2 3 4 8 7 6 5 MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 250°C/W TOP VIEW NULL 1 NULL V+ OUT SHDN MS8 PART MARKING LTIE ORDER PART NUMBER LT1637CN8 LT1637CS8 LT1637IN8 LT1637IS8 LT1637HS8 8 NULL 2 7 V+ + IN 3 6 OUT V– 4 5 SHDN – IN N8 PACKAGE 8-LEAD PDIP S8 PART MARKING 1637 1637I 1637H S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 150°C/W (N8) TJMAX = 150°C, θJA = 190°C/W (S8) Consult factory for parts specified with wider operating temperature ranges. U 3V A D 5V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –,VCM = VOUT = half supply unless otherwise specified. (Note 4) LT1637C/LT1637I MIN TYP MAX SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage N8, S8 Packages 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● MS8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● N8, S8 Packages, – 40°C ≤ TA ≤ 85°C MS8 Package, – 40°C ≤ TA ≤ 85°C VCM = 44V (Note 5) Input Offset Voltage Drift (Note 9) IOS IB Input Offset Current Input Bias Current VCM = 44V (Note 5) VS = 0V 2 UNITS 100 350 550 700 µV µV µV 100 350 750 900 µV µV µV ● ● 1 2 3 6 ● ● 0.4 6.0 2.5 nA µA ● ● 20 23 0.1 50 60 nA µA nA µV/°C µV/°C LT1637 U 3V A D 5V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –,VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL PARAMETER Input Noise Voltage CONDITIONS 0.1Hz to 10Hz en Input Noise Voltage Density f = 1kHz in Input Noise Current Density f = 1kHz RIN Input Resistance Differential Common Mode, VCM = 0V to 44V CIN Input Capacitance LT1637C/LT1637I MIN TYP MAX 0.6 UNITS µVP-P 27 nV/√Hz 0.08 pA/√Hz 2.6 1.4 MΩ MΩ 1 0.7 4 Input Voltage Range ● 0 pF 44 V CMRR Common Mode Rejection Ratio (Note 5) VCM = 0V to (VCC – 1V) VCM = 0V to 44V (Note 8) ● ● 88 80 110 98 dB dB AVOL Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0°C ≤ TA ≤ 70°C VS = 3V, – 40°C ≤ TA ≤ 85°C 150 100 75 400 ● ● V/mV V/mV V/mV VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0°C ≤ TA ≤ 70°C VS = 5V, – 40°C ≤ TA ≤ 85°C 300 200 150 800 ● ● V/mV V/mV V/mV VOL Output Voltage Swing LOW No Load ISINK = 5mA VS = 5V, ISINK = 10mA ● ● ● VOH Output Voltage Swing HIGH VS = 3V, No Load VS = 3V, ISOURCE = 5mA ● ● 2.94 2.25 2.975 2.67 V V VS = 5V, No Load VS = 5V, ISOURCE = 10mA ● ● 4.94 3.80 4.975 4.45 V V VS = 3V, Short Output to Ground VS = 3V, Short Output to VCC 10 15 14 45 mA mA VS = 5V, Short Output to Ground VS = 5V, Short Output to VCC 15 15 22 60 mA mA 90 98 ISC PSRR Short-Circuit Current (Note 2) Power Supply Rejection Ratio VS = 3V to 12.5V, VCM = VO = 1V Minimum Supply Voltage Reverse Supply Voltage IS ● 3 325 580 Supply Current (Note 6) ● 25 mV mV mV dB 2.7 ● IS = – 100µA 8 700 1300 40 V V 190 250 295 µA µA ● Supply Current, SHDN VPIN5 = 2V, No Load (Note 6) ● 3 12 µA Shutdown Pin Current VPIN5 = 0.3V, No Load (Note 6) VPIN5 = 2V, No Load (Note 5) VPIN5 = 3.3V VPIN5 = 5V ● ● 0.2 1.0 2.5 4.3 15 5 nA µA µA µA Output Leakage Current, SHDN VPIN5 = 2V, No Load (Note 6) ● 0.02 1 µA Maximum Shutdown Pin Current VPIN5 = 32V, No Load (Note 5) ● 20 150 µA tON Turn-On Time VPIN5 = 5V to 0V, RL = 10k 45 µs tOFF Turn-Off Time VPIN5 = 0V to 5V, RL = 10k 3 µs tSETTLING Settling Time 0.1% AV = 1, ∆VO = 2V 9 µs ISHDN 3 LT1637 U 3V A D 5V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA␣ ≤␣ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –, VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL PARAMETER CONDITIONS LT1637C/LT1637I MIN TYP MAX GBW Gain-Bandwidth Product (Note 5) f = 10kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 1000 ● ● 650 550 500 kHz kHz kHz Slew Rate (Note 7) AV = – 1, RL = ∞ 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 0.210 0.185 0.170 0.35 ● ● V/µs V/µs V/µs SR UNITS ±15V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA␣ ≤␣ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V – unless otherwise specified. (Note 4) LT1637C/LT1637I MIN TYP MAX SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage N8, S8 Packages 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● MS8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● N8, S8 Packages, – 40°C ≤ TA ≤ 85°C MS8 Package, – 40°C ≤ TA ≤ 85°C Input Offset Voltage Drift (Note 9) IOS Input Offset Current IB Input Bias Current UNITS 100 450 650 800 µV µV µV 100 450 800 950 µV µV µV ● ● 1 2 3 6 µV/°C µV/°C ● 1 6 nA 17 50 ● nA Input Noise Voltage 0.1Hz to 10Hz 0.6 µVP-P en Input Noise Voltage Density f = 1kHz 27 nV/√Hz in Input Noise Current Density f = 1kHz 0.08 pA/√Hz RIN Input Resistance Differential Common Mode, VCM = – 15V to 14V 3 2200 MΩ MΩ CIN Input Capacitance 1 4 Input Voltage Range ● – 15 pF 29 V CMRR Common Mode Rejection Ratio VCM = – 15V to 29V ● 80 110 dB AVOL Large-Signal Voltage Gain VO = ±14V, RL = 10k 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 100 75 50 400 ● ● V/mV V/mV V/mV No Load ISINK = 5mA ISINK = 10mA ● ● ● VOL 4 Output Voltage Swing LOW – 14.997 – 14.680 – 14.420 – 14.95 – 14.25 – 13.65 V V V LT1637 ±15V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA␣ ≤␣ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V – unless otherwise specified. (Note 4) LT1637C/LT1637I MIN TYP MAX SYMBOL PARAMETER CONDITIONS VOH Output Voltage Swing HIGH No Load ISOURCE = 5mA ISOURCE = 10mA ● ● ● 14.9 14.2 13.7 14.967 14.667 14.440 V V V ISC Short-Circuit Current (Note 2) Short Output to GND 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ±25 ±20 ±15 ±31.7 ● ● mA mA mA VS = ±1.5V to ±22V ● 90 115 dB PSRR Power Supply Rejection Ratio Minimum Supply Voltage IS ±1.35 V 230 300 370 µA µA ● Supply Current ● ISHDN UNITS Positive Supply Current, SHDN VPIN5 = – 20V, VS = ±22V, No Load ● 6 40 µA Shutdown Pin Current VPIN5 = – 21.7V, VS = ±22V, No Load VPIN5 = – 20V, VS = ±22V, No Load ● ● 0.3 0.9 15 8 nA µA Maximum Shutdown Pin Current VPIN5 = 32V, VS = ±22V ● 20 150 µA 0.02 2 µA Output Leakage Current, SHDN VPIN5 = – 20V, VS = ±22V, No Load ● VL Shutdown Pin Input Low Voltage VS = ±22V ● VH Shutdown Pin Input High Voltage VS = ±22V ● tON Turn-On Time VPIN5 = – 10V to – 15V, RL = 10k 35 µs tOFF Turn-Off Time VPIN5 = – 15V to – 10V, RL = 10k 3 µs GBW Gain-Bandwidth Product f = 10kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 750 650 600 1100 ● ● kHz kHz kHz AV = – 1, RL = ∞, VO = ±10V, Measure at VO = ±5V 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 0.225 0.200 0.180 0.4 ● ● V/µs V/µs V/µs SR Slew Rate – 21.7 – 21.6 – 20.8 V –20.0 V 5 LT1637 U 3V A D 5V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA␣ ≤␣ 125°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS MIN LT1637H TYP 100 ● IOS IB MAX UNITS 450 3 µV mV Input Offset Voltage Drift (Note 9) ● 10 µV/°C Input Offset Current VCM = 44V (Note 5) ● ● 15 10 nA µA VCM = 44V (Note 5) ● ● 150 100 nA µA 44 V Input Bias Current Input Voltage Range CMRR Common Mode Rejection Ratio (Note 5) VCM = 0.3V to (VCC – 1V) VCM = 0.3V to 44V AVOL Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k 3 ● 0.3 ● ● 72 74 150 20 400 ● V/mV V/mV 300 35 800 ● V/mV V/mV VS = 5V, VO = 500mV to 4.5V, RL = 10k dB dB VOL Output Voltage Swing LOW No Load ISINK = 5mA VS = 5V, ISINK = 10mA ● ● ● VOH Output Voltage Swing HIGH VS = 3V, No Load VS = 3V, ISOURCE = 5mA ● ● 2.90 2.05 V V VS = 5V, No Load VS = 5V, ISOURCE = 10mA ● ● 4.90 3.50 V V VS = 3V to 12.5V, VCM = VO = 1V ● 80 dB ● 2.7 V ● 23 V PSRR Power Supply Rejection Ratio Minimum Supply Voltage IS ISHDN GBW SR 6 Reverse Supply Voltage IS = – 100µA Supply Current (Note 6) 15 900 1500 mV mV mV ● 250 400 µA µA 190 Supply Current, SHDN VPIN5 = 2V, No Load (Note 6) ● 15 µA Shutdown Pin Current VPIN5 = 0.3V, No Load (Note 6) VPIN5 = 2V, No Load (Note 5) ● ● 200 7 nA µA Output Leakage Current, SHDN VPIN5 = 2V, No Load (Note 6) ● 5 µA Maximum Shutdown Pin Current VPIN5 = 32V, No Load (Note 5) ● 200 µA Gain-Bandwidth Product f = 10kHz (Note 5) Slew Rate 650 350 1000 ● kHz kHz 0.210 0.1 0.35 ● V/µs V/µs AV = – 1, RL = ∞ (Note 7) LT1637 ±15V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA␣ ≤␣ 125°C. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V – , TA = –40°C to 125°C, unless otherwise specified. (Note 4) SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS MIN LT1637H TYP 100 ● MAX UNITS 550 3.4 µV mV Input Offset Voltage Drift (Note 9) ● 11 µV/°C IOS Input Offset Current ● 25 nA IB Input Bias Current ● 250 nA CMRR Common Mode Rejection Ratio VCM = –14.7V to 29V AVOL Large-Signal Voltage Gain VO = ±14V, RL = 10k 3 ● 72 ● 100 4 Output Voltage Swing No Load IOUT = ±5mA IOUT= ±10mA ● ● ● PSRR Power Supply Rejection Ratio VS = ±1.5V to 22V ● 84 ● ±1.35 Minimum Supply Voltage Supply Current V V V dB V 230 ● ISHDN V/mV V/mV ±14.8 ±14.0 ±13.4 VO IS dB 400 300 500 µA µA Positive Supply Current, SHDN VPIN5 = –20V, VS = ±22V, No Load ● 60 µA Shutdown Pin Current VPIN5 = –21.7V, VS = ±22V, No Load VPIN5 = –20V, VS = ±22V, No Load ● ● 200 10 nA µA Maximum Shutdown Pin Current VPIN5 = 32V, VS = ±22V ● 200 µA Output Leakage Current, SHDN VPIN5 = –20V, VS = ±22V, No Load ● 100 µA VL Shutdown Pin Input Low Voltage VS = ±22V ● –21.7 V VH Shutdown Pin Input High Voltage VS = ±22V ● –20 GBW Gain-Bandwidth Product f = 10kHz 750 400 1100 ● kHz kHz 0.225 0.1 0.4 ● V/µs V/µs SR Slew Rate AV = – 1, RL = ∞, VO = ±10V, Measure at VO = ±5V Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. Note 3: The LT1637C and LT1637I are guaranteed functional over the operating temperature range of – 40°C to 85°C. The LT1637H is guaranteed functional over the operating temperature range of –40°C to 125°C. Note 4: The LT1637C is guaranteed to meet specified performance from 0°C to 70°C. The LT1637C is designed, characterized and expected to meet specified performance from – 40°C to 85°C but is not tested or QA sampled at these temperatures. The LT1637I is guaranteed to meet specified V performance from – 40°C to 85°C. The LT1637H is guaranteed to meet specified performance from –40°C to 125°C. Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = ±15V or VS = ±22V tests. Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = ±15V or VS = ±22V tests. Note 7: Guaranteed by correlation to slew rate at VS = ±15V and GBW at VS = 3V and VS = ±15V tests. Note 8: This specification implies a typical input offset voltage of 650µV at VCM = 44V and a maximum input offset voltage of 5.4mV at VCM = 44V. Note 9: This parameter is not 100% tested. 7 LT1637 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage 300 TA = 125°C 200 TA = 25°C 150 TA = –55°C 100 50 0 40 300 30 200 100 0 TA = 125°C –100 TA = –55°C –200 –300 10 20 30 40 TOTAL SUPPLY VOLTAGE (V) 0.08 0.04 1 2 3 4 TOTAL SUPPLY VOLTAGE (V) 5 4 1 Output Saturation Voltage vs Input Overdrive 10 OUTPUT SATURATION VOLTAGE (V) TA = 25°C TA = – 55°C 0.01 0.1 1 10 0.0001 0.001 0.01 SOURCING LOAD CURRENT (mA) 100 100 VS = 5V, 0V VOD = 30mV 1 0.1 TA = 125°C TA = 25°C 0.01 TA = – 55°C 0.001 0.1 1 10 0.0001 0.001 0.01 SINKING LOAD CURRENT (mA) 1637 G04 3 4 5 6 TIME (s) 7 8 9 10 1637 G07 8 50 40 30 OUTPUT HIGH 20 10 OUTPUT LOW 0 10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV) Input Noise Current vs Frequency 1.4 INPUT NOISE CURRENT DENSITY (pA/√Hz) INPUT NOISE VOLTAGE DENSITY (nV/√Hz) NOISE VOLTAGE (200nV/DIV) 2 60 Noise Voltage Density vs Frequency VS = ±15V 60 50 40 30 20 1 70 1637 G06 70 0 80 0 100 VS = 5V, 0V NO LOAD 90 1637 G05 0.1Hz to 10Hz Noise Voltage VS = ± 2.5V 4.2 4.4 4.6 4.8 5 10 20 30 40 50 COMMON MODE VOLTAGE (V) 1637 G03 Output Saturation Voltage vs Load Current (Output Low) TA = 125°C TA = 25°C 0 1637 G02 Output Saturation Voltage vs Load Current (Output High) 0.1 TA = 125°C 0.04 0.08 0 VS = 5V, 0V VOD = 30mV TA = –55°C 0.12 TA = 25°C 1637 G01 OUTPUT SATURATION VOLTAGE (V) 10 –400 0 VS = 5V, 0V 20 OUTPUT SATURATION VOLTAGE (mV) SUPPLY CURRENT (µA) 350 400 INPUT BIAS CURRENT (µA) CHANGE IN INPUT OFFSET VOLTAGE (µV) 400 250 Input Bias Current vs Common Mode Voltage Minimum Supply Voltage 1 10 100 FREQUENCY (Hz) 1000 1637 G08 VS = ±15V 1.2 1.0 0.8 0.6 0.4 0.2 0 1 10 100 FREQUENCY (Hz) 1000 1637 G09 LT1637 U W TYPICAL PERFOR A CE CHARACTERISTICS Open-Loop Gain and Phase Shift vs Frequency Gain-Bandwidth Product vs Temperature VS = ±2.5V 80 PHASE 40 60 30 40 GAIN 20 20 0 10 0 PHASE SHIFT (DEG) GAIN (dB) 50 100 –10 –20 1300 0.7 1200 0.6 1000 –30 10k 100k FREQUENCY (Hz) 1k VS = ±15V 1100 VS = ±1.5V 900 700 – 50 –25 1M 50 25 75 0 TEMPERATURE (°C) 100 1637 G10 50 PHASE MARGIN 45 40 GAIN BANDWIDTH 1100 35 1050 30 5 10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V) 45 COMMON MODE REJECTION RATIO (dB) 1250 0 25 80 VS = ±15V 70 60 VS = ±1.5V 50 40 30 20 10 50 75 25 TEMPERATURE (°C) 100 70 60 POSITIVE SUPPLY 50 40 30 NEGATIVE SUPPLY 20 10 0 10k 100k FREQUENCY (Hz) 1M 1k 10k 100k FREQUENCY (Hz) 1M 1637 G15 Undistorted Output Swing vs Frequency Output Impedance vs Frequency 10k 35 VS = ± 2.5V 30 PHASE MARGIN 125 VS = ± 2.5V 80 1637 G14 45 Vs = ±15V DISTORTION ≤ 1% AV = 1 1100 35 1000 30 GAIN BANDWIDTH 900 25 800 20 700 100 AV = 100 10 AV = 10 1 AV = 1 OUTPUT SWING (VP-P) 40 OUTPUT IMPEDANCE (Ω) 1k 1200 10 100k 1637 G16 0.1 100 1k 25 20 15 10 5 15 10k LOAD RESISTANCE (Ω) 0 –10 1k 50 VS = ± 2.5V – 25 1637 G12 0 PHASE MARGIN (DEG) GAIN-BANDWIDTH PRODUCT (kHz) 1400 1k FALLING, VS = ±1.5V PSRR vs Frequency 90 Gain-Bandwidth Product and Phase Margin vs Load Resistance 600 0.3 90 1637 G13 1300 FALLING, VS = ±15V 0.1 – 50 125 100 PHASE MARGIN (DEG) GAIN-BANDWIDTH PRODUCT (kHz) 55 1150 RISING, VS = ±1.5V 0.4 CMRR vs Frequency 1300 1000 0.5 1637 G11 Gain-Bandwidth Product and Phase Margin vs Supply Voltage 1200 RISING, VS = ±15V 0.2 800 POWER SUPPLY REJECTION RATIO (dB) 60 Slew Rate vs Temperature SLEW RATE (V/µs) 120 GAIN-BANDWIDTH PRODUCT (kHz) 70 10k 100k FREQUENCY (Hz) 1M 1637 G17 0 100 Vs = ± 2.5V 1k 10k FREQUENCY (Hz) 100k 1637 G18 9 LT1637 U W TYPICAL PERFOR A CE CHARACTERISTICS Capacitive Load Handling, Overshoot vs Capacitive Load Settling Time to 0.1% vs Output Step 100 VS = ±15V 8 90 80 AV = – 1 AV = 1 OVERSHOOT (%) OUTPUT STEP (V) 6 4 2 0 –2 –4 AV = 1 –6 10 VS = ±2.5V NO OUTPUT COMPENSATION AV = – 1 AV = 1 60 AV = 5 50 AV = 10 40 30 20 –8 VS = 3V, 0V VOUT = 1.8VP-P VCM = 1.2V RL =10k 1 AV = 2 70 THD + NOISE (%) 10 Total Harmonic Distortion + Noise vs Frequency 0.1 0.01 AV = –1 0.001 AV = 1 10 –10 0 10 0 30 20 SETTLING TIME (µs) 40 0.0001 10 100 1000 CAPACITIVE LOAD (pF) 10000 Total Harmonic Distortion + Noise vs Load Resistance 10 VS = 3V, 0V VIN = 0.6V TO 2.4V 0.01 1637 G21 RL = 10k VCM = HALF SUPPLY f = 1kHz FOR AV = –1, RG = 100k 1 THD + NOISE (%) THD + NOISE (%) 0.1 100k Total Harmonic Distortion + Noise vs Output Voltage VS = 3V TOTAL AV = 1 VIN = 1.8VP-P AT 1kHz VS = ±1.5V VIN = ±0.9V 1k 10k FREQUENCY (Hz) 1637 G20 1637 G19 1 100 10 0.001 AV = 1 VS = 3V, 0V AV = –1 VS = ±1.5V AV = 1 VS = ±1.5V 0.1 AV = 1 VS = 3V, 0V 0.01 VS = 3V, 0V VIN = 0.3V TO 2.1V AV = –1, VS = 3V, 0V 0.001 0.0001 100 1k 10k LOAD RESISTANCE TO GROUND (Ω) 0 100k 1 2 OUTPUT VOLTAGE (VP-P) 1637 G23 1637 G22 CHANGE IN INPUT OFFSET VOLTAGE (50µV/DIV) Open-Loop Gain Large-Signal Response Small-Signal Response VS = ±15V AV = – 1 VS = ±15V VS = ±15V AV = 1 10V A A B C 3 50mV B C – 50mV A: RL = 2k B: RL = 10k C: RL = 50k 0V 10V –10V OUTPUT VOLTAGE (5V/DIV) 10 – 10V 1637 G24 1637 G25 1637 G26 LT1637 U W U U APPLICATIO S I FOR ATIO Supply Voltage The positive supply pin of the LT1637 should be bypassed with a small capacitor (about 0.01µF) within an inch of the pin. When driving heavy loads an additional 4.7µF electrolytic capacitor should be used. When using split supplies, the same is true for the negative supply pin. The LT1637 is protected against reverse battery voltages up to 25V. In the event a reverse battery condition occurs, the supply current is typically less than 1nA. When operating the LT1637 on total supplies of 30V or more, the supply must not be brought up faster than 1µs. This is especially true if low ESR bypass capacitors are used. A series RLC circuit is formed from the supply lead inductance and the bypass capacitor. 5Ω of resistance in the supply or the bypass capacitor will dampen the tuned circuit enough to limit the rise time. Inputs The LT1637 has two input stages, NPN and PNP (see the Simplified Schematic), resulting in three distinct operating regions as shown in the Input Bias Current vs Common Mode typical performance curve. For input voltages about 0.9V or more below V +, the PNP input stage is active and the input bias current is typically – 20nA. When the input voltage is about 0.5V or less from V +, the NPN input stage is operating and the input bias current is typically 80nA. Increases in temperature will cause the voltage at which operation switches from the PNP stage to the NPN stage to move towards V +. The input offset voltage of the NPN stage is untrimmed and is typically 600µV. A Schottky diode in the collector of each NPN transistor of the NPN input stage allows the LT1637 to operate with either or both of its inputs above V +. At about 0.3V above V + the NPN input transistor is fully saturated and the input bias current is typically 23µA at room temperature. The input offset voltage is typically 600µV when operating above V +. The LT1637 will operate with its input 44V above V – regardless of V +. The inputs are protected against excursions as much as 22V below V – by an internal 1.3k resistor in series with each input and a diode from the input to the negative supply. There is no output phase reversal for inputs up to 5V below V –. There are no clamping diodes between the inputs and the maximum differential input voltage is 44V. Output The output voltage swing of the LT1637 is affected by input overdrive as shown in the typical performance curves. When monitoring input voltages within 100mV of V +, gain should be taken to keep the output from clipping. The output of the LT1637 can be pulled up to 25V beyond V + with less than 1nA of leakage current, provided that V + is less than 0.5V. The normally reverse biased substrate diode from the output to V – will cause unlimited currents to flow when the output is forced below V –. If the current is transient and limited to 100mA, no damage will occur. The LT1637 is internally compensated to drive at least 200pF of capacitance under any output loading conditions. A 0.22µF capacitor in series with a 150Ω resistor between the output and ground will compensate these amplifiers for larger capacitive loads, up to 4700pF, at all output currents. Distortion There are two main contributors of distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by nonlinear common mode rejection. Of course, if the op amp is operating inverting there is no common mode induced distortion. When the LT1637 switches between input stages there is significant nonlinearity in the CMRR. Lower load resistance increases the output crossover distortion, but has no effect on the input stage transition distortion. For lowest distortion the LT1637 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V + – 0.9V). See the Typical Performance Characteristics curves. 11 LT1637 U U W U APPLICATIO S I FOR ATIO The shutdown pin can be taken up to 32V above V –. The shutdown pin can be driven below V –, however the pin current through the substrate diode should be limited with an external resistor to less than 10mA. Gain The open-loop gain is less sensitive to load resistance when the output is sourcing current. This optimizes performance in single supply applications where the load is returned to ground. The typical performance photo of Open-Loop Gain for various loads shows the details. Input Offset Nulling The input offset voltage can be nulled by placing a 10k potentiometer between Pins 1 and 8 with its wiper to V – (see Figure 1). The null range will be at least ±3mV. Shutdown The LT1637 can be shut down two ways: using the shutdown pin or bringing V + to within 0.5V of V –. When V + is brought to within 0.5V of V – both the supply current and output leakage current drop to less than 10nA. When the shutdown pin is brought 1.2V above V –, the supply current drops to about 3µA and the output leakage current is less than 1µA, independent of V +. In either case the input bias current is less than 0.1nA (even if the inputs are 44V above the negative supply). LT1637 8 1 10k V– 1637 F01 Figure 1. Input Offset Nulling W W SI PLIFIED SCHE ATIC 7 V+ Q1 Q13 D1 – IN SHDN 10µA Q25 Q23 R3 1.3k R2 6k 5 Q19 D2 2 Q2 R1 1M D3 Q21 R4 1.3k + IN Q9 Q10 Q14 Q15 Q18 Q20 Q24 6 OUT Q22 3 Q11 Q12 Q17 Q16 Q26 Q3 Q4 Q5 Q6 Q7 Q8 D4 D5 NULL R5 7k R6 7k R7 400Ω R8 400Ω 1 8 NULL 4 V– 1637 SS 12 LT1637 U TYPICAL APPLICATIO S Optional Output Compensation for Capacitive Loads Greater Than 200pF Positive Supply Rail Current Sense 5V + VIN 200Ω LT1637 CL ≤ 4700pF – 0.2Ω + LOAD Q1 2N3904 LT1637 200Ω – 0.22µF 0V TO 4.3V 150Ω 2k ILOAD 1637 TA03 1637 TA02 VOUT = (2Ω)(ILOAD) Lamp Outage Detector 3V 5V TO 44V 1M LAMP ON/OFF 100k 5k 0.5Ω – LT1637 OUT + OUT = 0V FOR GOOD BULB 3V FOR OPEN BULB 1637 TA05 Over-The-Top Comparator with Hysteresis Over-The-Top Current Sense 3V TO 44V R1 200Ω 1M 3V TO 44V IN1 (0V TO 44V) 10k 3V + VOUT LT1637 – RS 0.2Ω + LT1637 1M – 1M 2N5087 IN2 (0V TO 44V) 10k ILOAD 1M LOAD V HYSTERESIS = CC 100 2N5210 ILOAD = VOUT (RS)(R2/R1) Q1 2N3904 VOUT (0V TO 2.7V) R2 2k 1637 TA06 1637 TA04 13 LT1637 U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. MS8 Package 8-Lead Plastic MSOP (LTC DWG # 05-08-1660) 0.043 (1.10) MAX 0.007 (0.18) 0.034 (0.86) REF 0.118 ± 0.004* (3.00 ± 0.102) 8 7 6 5 0° – 6° TYP SEATING PLANE 0.021 ± 0.006 (0.53 ± 0.015) 0.009 – 0.015 (0.22 – 0.38) 0.0256 (0.65) BSC 0.005 ± 0.002 (0.13 ± 0.05) 0.118 ± 0.004** (3.00 ± 0.102) 0.193 ± 0.006 (4.90 ± 0.15) MSOP (MS8) 1100 1 * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 2 3 4 N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) ( +0.035 0.325 –0.015 8.255 +0.889 –0.381 ) 0.045 – 0.065 (1.143 – 1.651) 0.130 ± 0.005 (3.302 ± 0.127) 0.065 (1.651) TYP 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.100 (2.54) BSC *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 14 0.400* (10.160) MAX 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 ± 0.003 (0.457 ± 0.076) N8 1098 LT1637 U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.189 – 0.197* (4.801 – 5.004) 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.053 – 0.069 (1.346 – 1.752) 0°– 8° TYP 0.016 – 0.050 (0.406 – 1.270) 0.014 – 0.019 (0.355 – 0.483) TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 8 7 6 5 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 1 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. 2 3 4 SO8 1298 15 LT1637 U TYPICAL APPLICATIO S Sample-and-Hold 3V VIN 3V + + LT1637 – 0.22µF SHDN VSAMPLE LT1636 150Ω VOUT – 3V 1637 TA07 0V DROOP (LT1636 BUFFER): 200mV/s DROOP INTO HIGH IMPEDANCE : LESS THAN 0.625mV/s MUX Amplifier MUX Amplifier Waveforms 5V VIN1 5kHz AT 4VP-P + VOUT LT1637 – VOUT 2V/DIV SHDN 5V – INPUT SELECT 5V/DIV LT1637 VIN2 10kHz AT 2VP–P + 0.2ms/DIV SHDN 1637 TA08 INPUT SELECT 1kHz AT 5VP–P 74HC04 1637 TA09 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1078/LT1079 LT2078/LT2079 Dual/Quad 55µA Max, Single Supply, Precision Op Amps Input/Output Common Mode Includes Ground, 70µV VOS(MAX) and 2.5µV/°C Drift (Max), 200kHz GBW, 0.07V/µs Slew Rate LT1178/LT1179 LT2178/LT2179 Dual/Quad 17µA Max, Single Supply, Precison Op Amps Input/Output Common Mode Includes Ground, 70µV VOS(MAX) and 4µV/°C Drift (Max), 85kHz GBW, 0.04V/µs Slew Rate LT1366/LT1367 Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps 475µV VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW LT1490/LT1491 Dual/Quad Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps Single Supply Input Range: – 0.4V to 44V, Micropower 50µA per Amplifier, Rail-to-Rail Input and Output, 200kHz GBW LT1636 Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp 55µA Supply Current, VCM Extends 44V above VEE, Independent of VCC; MSOP Package, Shutdown Function LT1638/LT1639 Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps 0.4V/µs Slew Rate, 230µA Supply Current per Amplifier LT1782 Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and Output Op Amp SOT-23, 800µV VOS(MAX), IS = 55µA (Max), Gain-Bandwidth = 200kHz, Shutdown Pin LT1783 1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and Output Op Amp SOT-23, 800µV VOS(MAX), IS = 300µA (Max), Gain-Bandwidth = 1.2MHz, Shutdown Pin 16 Linear Technology Corporation 1637f LT/LCG 1200 2K REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com LINEAR TECHNOLOGY CORPORATION 1999