LT1637IN8

FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ LT1637 1.1MHz, 0.4V/µ s Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp DESCRIPTIO 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. 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. For space limited applications, the LT1637 is available in a 3mm × 3mm × 0.8mm dual fine pitch leadless package (DFN). , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Over-The-Top is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Operates with Inputs Above V + Rail-to-Rail Input and Output Micropower: 250µA Supply Current Max Operating Temperature Range: – 55°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 Available in 8-Lead MSOP, PDIP and SO Packages; and a Tiny (3mm × 3mm × 0.8mm) DFN Package APPLICATIO S ■ ■ ■ ■ ■ Battery or Solar Powered Systems: Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring MUX Amplifiers 4mA to 25mA Transmitters TYPICAL APPLICATIO + LT1004-1.2 2k R* Over-The-Top® Current Source with Shutdown Switchable Precision Current Source 4V TO 44V VSHDN 6V 4V 2V 0V 4.7µF R + LT1637 TP0610 IOUT = 1.2 R e.g., 10mA = 120Ω 1637 TA01 10mA IOUT 5mA – IOUT SHDN 0mA 100µs/DIV 1637 TA01b *OPTIONAL FOR LOW OUTPUT CURRENTS, R* = R U U U Current Source Timing 1637fd 1 LT1637 ABSOLUTE AXI U RATI GS 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 LT1637MP ......................................... –55°C to 125°C PACKAGE/ORDER I FOR ATIO TOP VIEW NULL 1 –IN A 2 +IN A 3 V– 4 8 7 6 5 NULL V+ OUT SHDN NULL –IN +IN V– 1 2 3 4 DD PACKAGE 8-LEAD (3mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 160°C/W (NOTE 2) MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 250°C/W UNDERSIDE METAL CONNECTED TO V – ORDER PART NUMBER LT1637CDD LT1637IDD DD PART* MARKING LAAK LAAK ORDER PART NUMBER LT1637CMS8 LT1637IMS8 *The temperature grades are identified by a label on the shipping container. Consult factory for parts specified with wider operating temperature ranges. 3V A D 5V ELECTRICAL CHARACTERISTICS SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS 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 DD Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 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 100 ● ● 2 U U W WW U W (Note 1) Specified Temperature Range (Note 4) LT1637C/LT1637I .............................. – 40°C to 85°C LT1637H .......................................... – 40°C to 125°C LT1637MP ......................................... –55°C to 125°C Junction Temperature ........................................... 150°C Junction Temperature (DD Package) ................... 125°C Storage Temperature Range ................. – 65°C to 150°C Storage Temperature Range (DD Package) ....................................... – 65°C to 125°C Lead Temperature (Soldering, 10 sec).................. 300°C TOP VIEW TOP VIEW 8 7 6 5 NULL V+ OUT SHDN NULL 1 –IN 2 +IN 3 V– 4 8 7 6 5 NULL V+ OUT SHDN N8 PACKAGE S8 PACKAGE 8-LEAD PDIP 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 150°C/W (N8) TJMAX = 150°C, θJA = 190°C/W (S8) MS8 PART* MARKING LTIE LTIE ORDER PART NUMBER LT1637CN8 LT1637CS8 LT1637IN8 LT1637IS8 LT1637HS8 LT1637MPS8 S8 PART MARKING 1637 1637I 1637H 1637MP U UNITS µV µV µV µV µV µV µV µV µV 1637fd 350 550 700 350 750 1100 550 950 1100 100 ● ● 125 ● ● LT1637 3V A D 5V ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Input Offset Voltage Drift (Note 9) 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) CONDITIONS N8, S8 Packages, – 40°C ≤ TA ≤ 85°C MS8 Package, – 40°C ≤ TA ≤ 85°C DDPackage, – 40°C ≤ TA ≤ 85°C VCM = 44V (Note 5) IB Input Bias Current VCM = 44V (Note 5) V S = 0V Input Noise Voltage en in RIN CIN CMRR AVOL Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio (Note 5) Large-Signal Voltage Gain VCM = 0V to (VCC – 1V) VCM = 0V to 44V (Note 8) VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0°C ≤ TA ≤ 70°C VS = 3V, – 40°C ≤ TA ≤ 85°C VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0°C ≤ TA ≤ 70°C VS = 5V, – 40°C ≤ TA ≤ 85°C VOL Output Voltage Swing LOW No Load ISINK = 5mA VS = 5V, ISINK = 10mA VS = 3V, No Load VS = 3V, ISOURCE = 5mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA ISC Short-Circuit Current (Note 2) VS = 3V, Short Output to Ground VS = 3V, Short Output to VCC VS = 5V, Short Output to Ground VS = 5V, Short Output to VCC PSRR Power Supply Rejection Ratio Minimum Supply Voltage Reverse Supply Voltage IS Supply Current (Note 6) Supply Current, SHDN ISHDN Shutdown Pin Current VPIN5 = 2V, No Load (Note 6) VPIN5 = 0.3V, No Load (Note 6) VPIN5 = 2V, No Load (Note 5) VPIN5 = 3.3V VPIN5 = 5V VPIN5 = 2V, No Load (Note 6) IS = – 100µA VS = 3V to 12.5V, VCM = VO = 1V ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● IOS VOH U ● ● ● ● ● ● ● LT1637C/LT1637I MIN TYP MAX 1 3 2 6 2 6 0.4 20 23 0.1 0.6 27 0.08 1 0.7 0 88 80 150 100 75 300 200 150 110 98 400 2.6 1.4 4 44 6.0 2.5 50 60 UNITS µV/°C µV/°C µV/°C nA µA nA µA nA µVP-P nV/√Hz pA/√Hz MΩ MΩ pF V dB dB V/mV V/mV V/mV V/mV V/mV V/mV Input Offset Current 0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = 0V to 44V 800 3 325 580 2.94 2.25 4.94 3.80 10 15 15 15 90 25 2.975 2.67 4.975 4.45 14 45 22 60 98 8 700 1300 mV mV mV V V V V mA mA mA mA dB Output Voltage Swing HIGH 2.7 40 190 3 0.2 1.0 2.5 4.3 0.02 250 295 12 15 5 V V µA µA µA nA µA µA µA µA 1637fd Output Leakage Current, SHDN ● 1 3 LT1637 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 tON tOFF tSETTLING GBW PARAMETER Maximum Shutdown Pin Current Turn-On Time Turn-Off Time Settling Time Gain-Bandwidth Product (Note 5) Slew Rate (Note 7) CONDITIONS VPIN5 = 32V, No Load (Note 5) VPIN5 = 5V to 0V, RL = 10k VPIN5 = 0V to 5V, RL = 10k 0.1% AV = 1, ∆VO = 2V f = 10kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C AV = – 1, RL = ∞ 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● ● ● ● 3V A D 5V ELECTRICAL CHARACTERISTICS SR 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) SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS 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 DD Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C Input Offset Voltage Drift (Note 9) N8, S8 Packages, – 40°C ≤ TA ≤ 85°C MS8 Package, – 40°C ≤ TA ≤ 85°C DD Package, – 40°C ≤ TA ≤ 85°C ● ● ±15V ELECTRICAL CHARACTERISTICS IOS IB en in RIN CIN CMRR AVOL VOL 4 U LT1637C/LT1637I MIN TYP MAX 20 45 3 9 650 550 500 0.210 0.185 0.170 1000 150 UNITS µA µs µs µs kHz kHz kHz V/µs V/µs V/µs 0.35 LT1637C/LT1637I MIN TYP MAX 100 450 650 800 450 800 1150 650 1000 1150 3 6 6 6 50 UNITS µV µV µV µV µV µV µV µV µV µV/°C µV/°C µV/°C nA nA µVP-P nV/√Hz pA/√Hz MΩ MΩ pF 100 ● ● 125 ● ● ● ● ● ● ● 1 2 2 1 17 0.6 27 0.08 1 3 2200 4 Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Large-Signal Voltage Gain VCM = – 15V to 29V VO = ± 14V, RL = 10k 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C No Load ISINK = 5mA ISINK = 10mA 0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = – 15V to 14V ● ● ● ● ● ● ● – 15 80 100 75 50 110 400 29 V dB V/mV V/mV V/mV Output Voltage Swing LOW – 14.997 – 14.680 – 14.420 – 14.95 – 14.25 – 13.65 V V V 1637fd LT1637 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) SYMBOL VOH PARAMETER Output Voltage Swing HIGH CONDITIONS No Load ISOURCE = 5mA ISOURCE = 10mA Short Output to GND 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C VS = ± 1.5V to ± 22V ● ● ● ● ● ● ● ±15V ELECTRICAL CHARACTERISTICS LT1637C/LT1637I MIN TYP MAX 14.9 14.2 13.7 ± 25 ± 20 ± 15 90 14.967 14.667 14.440 ± 31.7 UNITS V V V mA mA mA dB ISC Short-Circuit Current (Note 2) PSRR IS Power Supply Rejection Ratio Minimum Supply Voltage Supply Current 115 ±1.35 230 300 370 40 15 8 150 2 –20.0 V µA µA µA nA µA µA µA V V µs µs kHz kHz kHz V/µs V/µs V/µs ● Positive Supply Current, SHDN ISHDN Shutdown Pin Current Maximum Shutdown Pin Current Output Leakage Current, SHDN VL VH tON tOFF GBW Shutdown Pin Input Low Voltage Shutdown Pin Input High Voltage Turn-On Time Turn-Off Time Gain-Bandwidth Product VPIN5 = – 20V, VS = ± 22V, No Load VPIN5 = – 21.7V, VS = ± 22V, No Load VPIN5 = – 20V, VS = ± 22V, No Load VPIN5 = 32V, VS = ± 22V VPIN5 = – 20V, VS = ± 22V, No Load VS = ± 22V VS = ± 22V VPIN5 = – 10V to – 15V, RL = 10k VPIN5 = – 15V to – 10V, RL = 10k f = 10kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C AV = – 1, RL = ∞, VO = ± 10V, Measure at VO = ± 5V 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● ● ● ● ● ● 6 0.3 0.9 20 0.02 – 21.7 – 21.6 – 20.8 35 3 750 650 600 0.225 0.200 0.180 1100 ● ● ● ● SR Slew Rate 0.4 1637fd 5 LT1637 The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C for LT1637H and –55°C ≤ TA ≤ 125°C for LT1637MP. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL VOS PARAMETER Input Offset Voltage ● 3V A D 5V ELECTRICAL CHARACTERISTICS CONDITIONS IOS IB CMRR AVOL VOL VOH PSRR IS ISHDN GBW SR 6 U LT1637H/LT1637MP MIN TYP MAX 100 ● UNITS µV mV µV/°C nA µA nA µA V dB dB 450 3 10 15 10 150 100 Input Offset Voltage Drift (Note 9) Input Offset Current VCM = 44V (Note 5) Input Bias Current VCM = 44V (Note 5) Input Voltage Range Common Mode Rejection Ratio (Note 5) Large-Signal Voltage Gain VCM = 0.3V to (VCC – 1V) VCM = 0.3V to 44V VS = 3V, VO = 500mV to 2.5V, RL = 10k 3 ● ● ● ● ● ● ● ● 0.3 72 74 150 20 300 35 400 800 44 V/mV V/mV V/mV V/mV 15 900 1500 mV mV mV V V V V dB V V VS = 5V, VO = 500mV to 4.5V, RL = 10k ● Output Voltage Swing LOW No Load ISINK = 5mA VS = 5V, ISINK = 10mA VS = 3V, No Load VS = 3V, ISOURCE = 5mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA ● ● ● ● ● ● ● ● ● ● ● Output Voltage Swing HIGH 2.90 2.05 4.90 3.50 80 2.7 23 190 250 400 15 200 7 5 200 650 350 0.210 0.1 1000 0.35 Power Supply Rejection Ratio Minimum Supply Voltage Reverse Supply Voltage Supply Current Supply Current, SHDN Shutdown Pin Current Output Leakage Current, SHDN Maximum Shutdown Pin Current Gain-Bandwidth Product Slew Rate VS = 3V to 12.5V, VCM = VO = 1V IS = – 100µA (Note 6) VPIN5 = 2V, No Load (Note 6) VPIN5 = 0.3V, No Load (Note 6) VPIN5 = 2V, No Load (Note 5) VPIN5 = 2V, No Load (Note 6) VPIN5 = 32V, No Load (Note 5) f = 10kHz (Note 5) µA µA µA nA µA µA µA kHz kHz V/µs V/µs ● ● ● ● ● ● AV = – 1, RL = ∞ (Note 7) ● 1637fd LT1637 ±15V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C for LT1637H and –55°C ≤ TA ≤ 125°C for LT1637MP. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V –, unless otherwise specified. (Note 4) SYMBOL VOS PARAMETER Input Offset Voltage ● CONDITIONS LT1637H/LT1637MP MIN TYP MAX 100 ● ● ● UNITS µV mV µV/°C nA nA dB V/mV V/mV 550 3.4 11 25 250 Input Offset Voltage Drift (Note 9) IOS IB CMRR AVOL VO Input Offset Current Input Bias Current Common Mode Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing VCM = –14.7V to 29V VO = ±14V, RL = 10k 3 ● ● 72 100 4 400 ±14.8 ±14.0 ±13.4 84 ±1.35 230 300 500 60 200 10 200 100 –21.7 –20 750 400 0.225 0.1 1100 0.4 No Load IOUT = ±5mA IOUT= ±10mA VS = ±1.5V to 22V ● ● ● ● ● ● V V V dB V µA µA µA nA µA µA µA V V kHz kHz V/µs V/µs PSRR IS Power Supply Rejection Ratio Minimum Supply Voltage Supply Current Positive Supply Current, SHDN VPIN5 = – 20V, VS = ±22V, No Load VPIN5 = – 21.7V, VS = ±22V, No Load VPIN5 = – 20V, VS = ±22V, No Load VPIN5 = 32V, VS = ±22V VPIN5 = – 20V, VS = ±22V, No Load VS = ±22V VS = ±22V f = 10kHz ● ● ● ● ● ● ● ● ISHDN Shutdown Pin Current Maximum Shutdown Pin Current Output Leakage Current, SHDN VL VH GBW SR Shutdown Pin Input Low Voltage Shutdown Pin Input High Voltage Gain-Bandwidth Product Slew Rate AV = – 1, RL = ∞, VO = ±10V, Measure at VO = ±5V ● Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. The θJA specified for the DD package is with minimal PCB heat spreading metal. Using expanded metal area on all layers of a board reduces this value. 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. The LT1637MP is guaranteed functional over the operating temperature range –55°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 performance from – 40°C to 85°C. The LT1637H is guaranteed to meet specified performance from –40°C to 125°C and the LT1637MP is guaranteed to meet specified performance from –55°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. 1637fd 7 LT1637 TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage 400 400 CHANGE IN INPUT OFFSET VOLTAGE (µV) 350 SUPPLY CURRENT (µA) 300 250 200 150 100 50 0 0 10 20 30 40 TOTAL SUPPLY VOLTAGE (V) 1637 G01 200 100 0 –100 –200 –300 –400 0 1 2 3 4 TOTAL SUPPLY VOLTAGE (V) 5 1637 G02 INPUT BIAS CURRENT (µA) TA = 125°C TA = 25°C TA = – 55°C Output Saturation Voltage vs Load Current (Output High) 1 OUTPUT SATURATION VOLTAGE (V) OUTPUT SATURATION VOLTAGE (V) OUTPUT SATURATION VOLTAGE (mV) VS = 5V, 0V VOD = 30mV 0.1 TA = 125°C TA = 25°C TA = – 55°C 0.01 0.1 1 10 0.0001 0.001 0.01 SOURCING LOAD CURRENT (mA) 0.1Hz to 10Hz Noise Voltage 70 INPUT NOISE VOLTAGE DENSITY (nV/√Hz) VS = ± 2.5V NOISE VOLTAGE (200nV/DIV) VS = ±15V 60 INPUT NOISE CURRENT DENSITY (pA/√Hz) 0 1 2 3 456 TIME (s) 7 8 UW 1637 G04 Minimum Supply Voltage 40 30 20 10 0.12 0.08 0.04 0 0.04 0.08 Input Bias Current vs Common Mode Voltage VS = 5V, 0V 300 TA = – 55°C TA = 125°C TA = – 55°C TA = 25°C TA = 125°C TA = 25°C 4 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) 10 VS = 5V, 0V VOD = 30mV 1 100 90 80 70 60 50 40 30 20 10 0 Output Saturation Voltage vs Input Overdrive VS = 5V, 0V NO LOAD 0.1 TA = 125°C 0.01 TA = 25°C TA = – 55°C 100 1637 G05 OUTPUT HIGH 100 0.001 0.1 1 10 0.0001 0.001 0.01 SINKING LOAD CURRENT (mA) OUTPUT LOW 0 10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV) 1637 G06 Noise Voltage Density vs Frequency 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 Input Noise Current vs Frequency VS = ±15V 50 40 30 20 8 9 10 1 10 100 FREQUENCY (Hz) 1000 1637 G08 1 10 100 FREQUENCY (Hz) 1000 1637 G09 1637 G07 1637fd LT1637 TYPICAL PERFOR A CE CHARACTERISTICS Open-Loop Gain and Phase Shift vs Frequency 70 60 50 40 GAIN (dB) VS = ± 2.5V PHASE GAIN-BANDWIDTH PRODUCT (kHz) 1100 1000 900 800 700 – 50 –25 SLEW RATE (V/µs) 30 20 10 0 –10 –20 –30 1k 10k 100k FREQUENCY (Hz) 1M 1637 G10 GAIN Gain-Bandwidth Product and Phase Margin vs Supply Voltage 1300 55 100 POWER SUPPLY REJECTION RATIO (dB) COMMON MODE REJECTION RATIO (dB) GAIN-BANDWIDTH PRODUCT (kHz) 1250 PHASE MARGIN 1200 1150 GAIN BANDWIDTH 1100 1050 1000 0 5 10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V) Gain-Bandwidth Product and Phase Margin vs Load Resistance 1400 GAIN-BANDWIDTH PRODUCT (kHz) 1300 1200 1100 1000 VS = ± 2.5V PHASE MARGIN OUTPUT SWING (VP-P) 40 35 30 GAIN BANDWIDTH 25 20 15 1k 10k LOAD RESISTANCE (Ω) 10 100k 1637 G16 OUTPUT IMPEDANCE (Ω) 900 800 700 600 UW 45 1637 G13 Gain-Bandwidth Product vs Temperature 120 100 80 60 40 20 0 PHASE SHIFT (DEG) PHASE MARGIN (DEG) PHASE MARGIN (DEG) Slew Rate vs Temperature 0.7 0.6 RISING, VS = ± 15V 1300 1200 VS = ±15V 0.5 0.4 0.3 0.2 0.1 – 50 RISING, VS = ± 1.5V FALLING, VS = ± 15V FALLING, VS = ± 1.5V VS = ±1.5V 50 25 75 0 TEMPERATURE (°C) 100 125 – 25 0 50 75 25 TEMPERATURE (°C) 100 125 1637 G11 1637 G12 CMRR vs Frequency 90 80 70 60 50 40 30 20 10 0 –10 1k 10k 100k FREQUENCY (Hz) 1M 1637 G14 PSRR vs Frequency VS = ± 2.5V 90 80 70 60 50 40 30 20 10 0 VS = ±15V VS = ±1.5V 50 45 40 35 30 25 POSITIVE SUPPLY NEGATIVE SUPPLY 1k 10k 100k FREQUENCY (Hz) 1M 1637 G15 Output Impedance vs Frequency 50 45 1k 10k VS = ± 2.5V Undistorted Output Swing vs Frequency 35 30 25 20 15 10 5 0 100 Vs = ± 2.5V Vs = ± 15V DISTORTION ≤ 1% AV = 1 100 AV = 100 10 AV = 10 1 AV = 1 0.1 100 1k 10k 100k FREQUENCY (Hz) 1M 1637 G17 1k 10k FREQUENCY (Hz) 100k 1637 G18 1637fd 9 LT1637 TYPICAL PERFOR A CE CHARACTERISTICS Settling Time to 0.1% vs Output Step 10 8 6 OUTPUT STEP (V) VS = ± 15V OVERSHOOT (%) 2 0 –2 –4 –6 –8 –10 0 10 30 20 SETTLING TIME (µs) 40 1637 G19 60 50 40 30 20 10 0 10 AV = 1 AV = 5 THD + NOISE (%) 4 AV = 1 AV = – 1 AV = 1 AV = – 1 Total Harmonic Distortion + Noise vs Load Resistance 1 VS = ±1.5V VIN = ±0.9V 0.1 THD + NOISE (%) 0.01 VS = 3V, 0V VIN = 0.6V TO 2.4V THD + NOISE (%) 0.001 VS = 3V, 0V VIN = 0.3V TO 2.1V 0.0001 100 1k 10k LOAD RESISTANCE TO GROUND (Ω) 100k Open-Loop Gain CHANGE IN INPUT OFFSET VOLTAGE (50µV/DIV) VS = ±15V A B C A: RL = 2k B: RL = 10k C: RL = 50k –10V 0V 10V OUTPUT VOLTAGE (5V/DIV) 1637 G24 A B C 10 UW Capacitive Load Handling, Overshoot vs Capacitive Load 100 90 80 70 VS = ±2.5V NO OUTPUT COMPENSATION AV = 2 Total Harmonic Distortion + Noise vs Frequency 10 VS = 3V, 0V VOUT = 1.8VP-P VCM = 1.2V RL =10k 1 0.1 AV = 10 0.01 AV = – 1 AV = 1 0.001 0.0001 100 1000 CAPACITIVE LOAD (pF) 10000 1637 G20 10 100 1k 10k FREQUENCY (Hz) 100k 1637 G21 Total Harmonic Distortion + Noise vs Output Voltage 10 RL = 10k VCM = HALF SUPPLY f = 1kHz FOR AV = –1, RG = 100k AV = 1 VS = 3V, 0V VS = 3V TOTAL AV = 1 VIN = 1.8VP-P AT 1kHz 1 AV = –1 VS = ±1.5V AV = 1 VS = ±1.5V AV = 1 VS = 3V, 0V 0.1 0.01 0.001 0 AV = –1, VS = 3V, 0V 1 2 OUTPUT VOLTAGE (VP-P) 3 1637 G23 1637 G22 Large-Signal Response VS = ± 15V AV = – 1 10V 50mV Small-Signal Response VS = ± 15V AV = 1 – 50mV – 10V 1637 G25 1637 G26 1637fd LT1637 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 +. U 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. 1637fd W U U 11 LT1637 APPLICATIO S I FOR ATIO 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. 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). SI PLIFIED SCHE ATIC 7 V+ Q1 D1 R2 6k SHDN 5 R1 1M Q3 Q4 R5 7k Q5 Q6 Q7 Q8 D4 D5 NULL 1 R7 400Ω R8 400Ω 1637 SS R3 1.3k – IN Q2 + IN 3 Q11 Q12 Q16 Q17 2 R4 1.3k Q9 Q10 Q14 Q15 10µA 12 U 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. 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. LT1637 8 1 10k V– 1637 F01 W W U U Figure 1. Input Offset Nulling W Q13 D2 Q19 Q25 Q23 D3 Q21 Q18 Q20 Q22 Q24 6 OUT Q26 R6 7k 8 NULL 4 V– 1637fd LT1637 TYPICAL APPLICATIO S Positive Supply Rail Current Sense 5V 200Ω 0.2Ω 200Ω LOAD ILOAD + LT1637 Q1 2N3904 0V TO 4.3V 2k VOUT = (2Ω)(ILOAD) 1637 TA02 – Over-The-Top Comparator with Hysteresis 1M 3V TO 44V IN1 (0V TO 44V) 10k + LT1637 VOUT 1M – 2N5087 IN2 (0V TO 44V) 10k 1M V HYSTERESIS = CC 100 2N5210 1637 TA04 U Optional Output Compensation for Capacitive Loads Greater Than 200pF VIN + LT1637 – 0.22µF 150Ω 1637 TA03 CL ≤ 4700pF Lamp Outage Detector 5V TO 44V 1M LAMP ON/OFF 100k 5k 0.5Ω 3V – LT1637 OUT + OUT = 0V FOR GOOD BULB 3V FOR OPEN BULB 1637 TA05 Over-The-Top Current Sense 3V TO 44V R1 200Ω 3V RS 0.2Ω + LT1637 – 1M ILOAD LOAD ILOAD = VOUT (RS)(R2/R1) Q1 2N3904 VOUT (0V TO 2.7V) R2 2k 1637 TA06 1637fd 13 LT1637 PACKAGE DESCRIPTIO 3.5 ± 0.05 1.65 ± 0.05 2.15 ± 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 2.38 ± 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 5.23 (.206) MIN 0.42 ± 0.038 (.0165 ± .0015) TYP RECOMMENDED SOLDER PAD LAYOUT DETAIL “A” 0° – 6° TYP 4.90 ± 0.152 (.193 ± .006) 3.00 ± 0.102 (.118 ± .004) (NOTE 4) GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 0.18 (.007) SEATING PLANE 0.22 – 0.38 (.009 – .015) TYP 0.127 ± 0.076 (.005 ± .003) MSOP (MS8) 0204 NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 14 U DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) R = 0.115 TYP 5 0.675 ± 0.05 0.38 ± 0.10 8 3.00 ± 0.10 (4 SIDES) PIN 1 TOP MARK (NOTE 6) (DD) DFN 1203 1.65 ± 0.10 (2 SIDES) 0.200 REF 0.75 ± 0.05 4 0.25 ± 0.05 2.38 ± 0.10 (2 SIDES) 1 0.50 BSC 0.00 – 0.05 BOTTOM VIEW—EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 ± 0.127 (.035 ± .005) 3.20 – 3.45 (.126 – .136) 0.65 (.0256) BSC 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 8 7 65 0.52 (.0205) REF 0.254 (.010) 1 1.10 (.043) MAX 23 4 0.86 (.034) REF 0.65 (.0256) BSC 1637fd LT1637 PACKAGE DESCRIPTIO .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 ) INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) NOTE: 1. DIMENSIONS ARE .050 BSC 8 .245 MIN .030 ±.005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 0°– 8° TYP NOTE: 1. DIMENSIONS IN INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 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 N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 .255 ± .015* (6.477 ± 0.381) 1 2 3 4 .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) N8 1002 .100 (2.54) BSC S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 7 6 5 .045 ±.005 .160 ±.005 .228 – .244 (5.791 – 6.197) .150 – .157 (3.810 – 3.988) NOTE 3 1 2 3 4 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) .016 – .050 (0.406 – 1.270) .014 – .019 (0.355 – 0.483) TYP .050 (1.270) BSC SO8 0303 1637fd 15 LT1637 TYPICAL APPLICATIO S Sample-and-Hold 3V VIN 3V LT1637 VSAMPLE 3V 0V DROOP (LT1636 BUFFER): 200mV/s DROOP INTO HIGH IMPEDANCE : LESS THAN 0.625mV/s MUX Amplifier 5V VIN1 5kHz AT 4VP-P + LT1637 VOUT – SHDN – LT1637 VIN2 10kHz AT 2VP–P + SHDN INPUT SELECT 1kHz AT 5VP–P 74HC04 1637 TA09 RELATED PARTS PART NUMBER LT1078/LT1079 LT2078/LT2079 LT1178/LT1179 LT2178/LT2179 LT1366/LT1367 LT1490/LT1491 LT1636 LT1638/LT1639 LT1782 LT1783 DESCRIPTION Dual/Quad 55µA Max, Single Supply, Precision Op Amps Dual/Quad 17µA Max, Single Supply, Precision Op Amps Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps Dual/Quad Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and Output Op Amp 1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and Output Op Amp 16 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● U + + 150Ω 0.22µF – SHDN LT1636 VOUT – 1637 TA07 MUX Amplifier Waveforms VOUT 2V/DIV 5V INPUT SELECT 5V/DIV 0.2ms/DIV 1637 TA08 COMMENTS Input/Output Common Mode Includes Ground, 70µV VOS(MAX) and 2.5µV/°C Drift (Max), 200kHz GBW, 0.07V/µs Slew Rate Input/Output Common Mode Includes Ground, 70µV VOS(MAX) and 4µV/°C Drift (Max), 85kHz GBW, 0.04V/µs Slew Rate 475µV VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW Single Supply Input Range: – 0.4V to 44V, Micropower 50µA per Amplifier, Rail-to-Rail Input and Output, 200kHz GBW 55µA Supply Current, VCM Extends 44V above VEE, Independent of VCC; MSOP Package, Shutdown Function 0.4V/µs Slew Rate, 230µA Supply Current per Amplifier SOT-23, 800µV VOS(MAX), IS = 55µA (Max), Gain-Bandwidth = 200kHz, Shutdown Pin SOT-23, 800µV VOS(MAX), IS = 300µA (Max), Gain-Bandwidth = 1.2MHz, Shutdown Pin 1637fd LT 0107 REV D • PRINTED IN USA www.linear.com © LINEAR TECHNOLOGY CORPORATION 2007