LT1636 Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Rail-to-Rail Input and Output Micropower: 50µA IQ, 44V Supply MSOP Package Over-The-TopTM: Input Common Mode Range Extends 44V Above VEE, Independent of VCC Low Input Offset Voltage: 225µV Max Specified on 3V, 5V and ±15V Supplies High Output Current: 18mA Output Shutdown Output Drives 10,000pF with Output Compensation Reverse Battery Protection to 27V High Voltage Gain: 2000V/mV High CMRR: 110dB 220kHz Gain-Bandwidth Product U APPLICATIO S ■ ■ ■ ■ Battery- or Solar-Powered Systems Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring MUX Amplifiers 4mA to 20mA Transmitters , LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a trademark of Linear Technology Corporation. U ■ The LT®1636 op amp operates on all single and split supplies with a total voltage of 2.7V to 44V drawing less than 50µA of quiescent current. The LT1636 can be shut down, making the output high impedance and reducing the quiescent current to 4µA. The LT1636 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. The output swings to both supplies. Unlike most micropower op amps, the LT1636 can drive heavy loads; its rail-to-rail output drives 18mA. The LT1636 is unity-gain stable into all capacitive loads up to 10,000pF when a 0.22µF and 150Ω compensation network is used. The LT1636 is reverse supply protected: it draws no current for reverse supply up to 27V. 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 LT1636 op amp is available in the 8-pin MSOP, PDIP and SO packages. TYPICAL APPLICATIO Input Bias Current vs Common Mode Voltage 5000 Over-The-Top Current Source with Shutdown VS = 5V, 0V LT1004-1.2 R* 1M R + LT1636 J176 – IOUT SHDN IOUT = 1.2 R e.g., 10mA = 120Ω *OPTIONAL FOR LOW OUTPUT CURRENTS 1636 TA01 INPUT BIAS CURRENT (nA) 3000 4V TO 44V 1000 40 30 TA = – 55°C 20 10 TA = 125°C TA = 25°C 0 –10 4.0 4.4 4.8 5.2 10 20 30 40 50 COMMON MODE VOLTAGE (V) 1636 G03 1 LT1636 U W W W ABSOLUTE MAXIMUM RATINGS (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 ................ – 40°C to 85°C Specified Temperature Range (Note 3) .. – 40°C to 85°C Junction Temperature ........................................... 150°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C W U U PACKAGE/ORDER INFORMATION ORDER PART NUMBER TOP VIEW NULL –IN +IN V– 1 2 3 4 8 7 6 5 LT1636CMS8 NULL V+ OUT SHDN MS8 PACKAGE 8-LEAD PLASTIC MSOP MS8 PART MARKING TJMAX = 150°C, θJA = 250°C/ W LTCL ORDER PART NUMBER TOP VIEW NULL 1 8 NULL –IN 2 7 V+ +IN 3 6 OUT V– 4 5 SHDN LT1636CN8 LT1636CS8 LT1636IN8 LT1636IS8 N8 PACKAGE 8-LEAD PLASTIC DIP S8 PACKAGE 8-LEAD PLASTIC SO S8 PART MARKING TJMAX = 150°C, θJA = 130°C/ W (N8) TJMAX = 150°C, θJA = 190°C/ W (S8) 1636 1636I Consult factory for Military grade parts. 3V, 5V ELECTRICAL CHARACTERISTICS VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, Pin 5 = open or VEE, Pins 1 and 8 open, TA = 25°C unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage N8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● S8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● MS8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● N8 Package, – 40°C ≤ TA ≤ 85°C S8 Package, – 40°C ≤ TA ≤ 85°C MS8 Package, – 40°C ≤ TA ≤ 85°C VCM = 44V (Note 4) Input Offset Voltage Drift (Note 8) IOS IB Input Offset Current Input Bias Current VCM = 44V (Note 4) VS = 0V MIN TYP MAX UNITS 50 225 400 550 µV µV µV 50 225 600 750 µV µV µV 50 225 700 850 µV µV µV ● ● ● 1 2 2 5 8 10 µV/°C µV/°C µV/°C ● ● 0.1 0.8 0.6 nA µA ● ● 5 3 0.1 8 6 nA µA nA Input Noise Voltage 0.1Hz to 10Hz 0.7 µVP-P en Input Noise Voltage Density f = 1kHz 52 nV/√Hz in Input Noise Current Density f = 1kHz 0.035 pA/√Hz 2 LT1636 3V, 5V ELECTRICAL CHARACTERISTICS VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, Pin 5 = open or VEE, Pins 1 and 8 open, TA = 25°C unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS RIN Input Resistance Differential Common Mode, VCM = 0V to 44V CIN Input Capacitance Input Voltage Range MIN TYP MAX 6 7 10 15 MΩ MΩ 4 pF 44 UNITS ● 0 CMRR Common Mode Rejection Ratio (Note 4) VCM = 0V to VCC – 1V VCM = 0V to 44V (Note 7) ● ● 84 86 110 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 200 133 100 1300 ● ● 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 400 250 200 2000 ● ● 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 ● ● 2.95 2.55 2.985 2.8 V V VS = 5V, No Load VS = 5V, ISOURCE = 10mA ● ● 4.95 4.30 4.985 4.75 V V VS = 3V, Short to GND VS = 3V, Short to VCC 7 20 15 42 mA mA VS = 5V, Short to GND VS = 5V, Short to VCC 12 25 25 50 mA mA 103 dB ISC PSRR IS Short-Circuit Current (Note 2) 2 480 860 Power Supply Rejection Ratio VS = 2.7V to 12.5V, VCM = VO = 1V ● 90 Reverse Supply Voltage IS = – 100µA ● 27 Supply Current (Note 5) 10 875 1600 V 40 mV mV mV V 42 55 60 µA µA ● Supply Current, SHDN VPIN5 = 2V, No Load (Note 5) ● 4 12 µA Shutdown Pin Current VPIN5 = 0.3V, No Load (Note 5) VPIN5 = 2V, No Load (Note 4) ● ● 0.5 1.1 15 5 nA µA Output Leakage Current VPIN5 = 2V, No Load (Note 5) ● 0.05 1 µA Maximum Shutdown Pin Current VPIN5 = 32V, No Load (Note 4) ● 27 150 µA tON Turn-On Time VPIN5 = 5V to 0V, RL = 10k 120 tOFF Turn-Off Time VPIN5 = 0V to 5V, RL = 10k 2.5 µs GBW Gain Bandwidth Product (Note 4) f = 1kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 200 ● ● 110 100 90 kHz kHz kHz Slew Rate (Note 6) AV = – 1, RL = ∞ 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 0.035 0.031 0.030 0.07 ● ● V/µs V/µs V/µs ISD SR µs 3 LT1636 ±15V ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, VOUT = 0V, Pin 5 = open or VEE, Pins 1 and 8 open, TA = 25°C unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage N8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● S8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● MS8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● N8 Package, – 40°C ≤ TA ≤ 85°C S8 Package, – 40°C ≤ TA ≤ 85°C MS8 Package, – 40°C ≤ TA ≤ 85°C Input Offset Voltage Drift (Note 8) IOS Input Offset Current IB Input Bias Current MIN TYP MAX UNITS 100 450 550 700 µV µV µV 100 450 750 900 µV µV µV 100 450 850 1000 µV µV µV ● ● ● 1 2 2 4 8 10 µV/°C µV/°C µV/°C ● 0.2 1.0 nA ● 4 10 nA 1 µVP-P f = 1kHz 52 nV/√Hz f = 1kHz 0.035 pA/√Hz 13 12000 MΩ MΩ Input Noise Voltage 0.1Hz to 10Hz en Input Noise Voltage Density in Input Noise Current Density RIN Input Resistance Differential Common Mode, VCM = – 15V to 14V CIN Input Capacitance 5.2 4 Input Voltage Range ● – 15 pF 29 V CMRR Common Mode Rejection Ratio VCM = – 15V to 29V ● 86 103 dB AVOL Large-Signal Voltage Gain VO = ±14V, RL = 10k 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 500 ● ● 100 75 50 V/mV V/mV V/mV VOL Output Voltage Swing LOW No Load ISINK = 5mA ISINK = 10mA ● ● ● VOH Output Voltage Swing HIGH No Load ISOURCE = 5mA ISOURCE = 10mA ● ● ● 14.9 14.5 14.3 14.975 14.750 14.650 ISC Short-Circuit Current (Note 2) Short to GND 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ±18 ±15 ±10 ±30 ● ● mA mA mA VS = ±1.35V to ±22V ● 90 114 dB PSRR Power Supply Rejection Ratio IS Supply Current – 14.997 – 14.500 – 14.125 50 ● ISHDN GBW 4 – 14.95 – 14.07 – 13.35 V V V V V V 70 85 µA µA Positive Supply Current, SHDN VPIN5 = – 20V, VS = ±22V, No Load ● 12 30 µA Shutdown Pin Current VPIN5 = – 21.7V, VS = ±22V, No Load VPIN5 = – 20V, VS = ±22V, No Load ● ● 0.7 1.2 15 8 nA µA Maximum Shutdown Pin Current VPIN5 = 32V, VS = ±22V ● 27 150 µA Output Leakage Current VPIN5 = – 20V, VS = ±22V, No Load ● 0.1 2 Gain Bandwidth Product f = 1kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● 125 110 100 220 µA kHz kHz kHz LT1636 ±15V ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, VOUT = 0V, Pin 5 = open or VEE, Pins 1 and 8 open, TA = 25°C unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS SR Slew Rate AV = – 1, RL = ∞, VO = ±10V Measured at ±5V 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C The ● denotes specifications that apply over the full specified temperature range. 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 LT1636C is guaranteed to meet specified performance from 0°C to 70°C and is designed, characterized and expected to meet these extended temperature limits, but is not tested at –40°C and 85°C. The LT1636I is guaranteed to meet the extended temperature limits. ● ● MIN TYP 0.0375 0.033 0.030 0.075 MAX UNITS V/µs V/µs V/µs Note 4: VS = 5V limits are guaranteed by correlation to VS = 3V, and VS = ±15V or VS = ±22V tests. Note 5: VS = 3V limits are guaranteed by correlation to VS = 5V, and VS = ±15V or VS = ±22V tests. Note 6: Guaranteed by correlation to slew rate at VS = ±15V, and GBW at VS = 3V and VS = ±15V tests. Note 7: This specification implies a typical input offset voltage of 600µV at VCM = 44V and a maximum input offset voltage of 3mV at VCM = 44V. Note 8: This parameter is not 100% tested. U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage 300 60 TA = 25°C 50 40 TA = – 55°C TA = 125°C 30 20 10 100 0 –100 TA = 125°C TA = – 55°C 5 10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V) TA = 25°C 0 45 1 2 3 4 TOTAL SUPPLY VOLTAGE (V) Output Saturation Voltage vs Load Current (Output High) 30 10 OUTPUT SATURATION VOLTAGE (V) 0.1 TA = 125°C TA = 25°C TA = – 55°C 100 1636 G04 TA = 125°C TA = 25°C 0 –10 5 4.0 4.4 4.8 5.2 10 20 30 40 50 COMMON MODE VOLTAGE (V) 1636 G03 Output Saturation Voltage vs Input Overdrive 10 VS = 5V VOD = 30mV TA = – 55°C 20 Output Saturation Voltage vs Load Current (Output Low) 1 OUTPUT SATURATION VOLTAGE (V) 40 1636 G02 1636 G01 0.01 0.1 1 10 0.0001 0.001 0.01 SOURCING LOAD CURRENT (mA) 1000 –200 –300 0 VS = 5V, 0V 3000 200 100 VS = 5V VOD = 30mV OUTPUT SATURATION VOLTAGE (mV) SUPPLY CURRENT (µA) 70 5000 INPUT BIAS CURRENT (nA) CHANGE IN INPUT OFFSET VOLTAGE (µV) 80 0 Input Bias Current vs Common Mode Voltage Minimum Supply Voltage 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) 80 70 60 50 40 30 20 1636 G05 OUTPUT HIGH 10 0 100 VS = ± 2.5V NO LOAD 90 OUTPUT LOW 0 10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV) 1636 G06 5 LT1636 U W TYPICAL PERFOR A CE CHARACTERISTICS Noise Voltage Density vs Frequency 0.1Hz to 10Hz Noise Voltage Input Noise Current vs Frequency 80 INPUT NOISE CURRENT DENSITY (pA/√Hz) NOISE VOLTAGE (400nV/DIV) INPUT NOISE VOLTAGE DENSITY (nV/√Hz) VS = ± 2.5V 0.35 70 60 50 40 3 4 5 6 TIME (SEC) 7 8 9 10 100 FREQUENCY (Hz) 1 10 Open-Loop Gain and Phase Shift vs Frequency 100 GAIN (dB) 30 20 20 0 GAIN –20 0 – 40 –10 – 60 –20 – 80 –30 GAIN-BANDWIDTH PRODUCT (kHz) 40 PHASE PHASE SHIFT (DEG) 40 –100 10k 100k FREQUENCY (Hz) 200 VS = ±1.5V 180 GAIN BANDWIDTH 30 200 20 5 10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V) 45 1636 G13 6 COMMON MODE REJECTION RATIO (dB) GAIN-BANDWIDTH PRODUCT (kHz) 240 0 0.09 FALLING, VS = ±15V 0.08 0.07 FALLING, VS = ±1.5V 0.06 160 0.05 50 25 75 0 TEMPERATURE (°C) 100 0.04 – 50 125 – 25 0 50 75 25 TEMPERATURE (°C) 110 100 VS = ±15V 80 70 VS = ±1.5V 60 125 PSRR vs Frequency 80 90 100 1636 G12 120 PHASE MARGIN (DEG) 40 180 RISING, VS = ±15V 0.10 VS = ±15V CMRR vs Frequency 220 RISING, VS = ±1.5V 1636 G11 50 PHASE MARGIN 260 Slew Rate vs Temperature 0.11 220 Gain-Bandwidth Product and Phase Margin vs Supply Voltage 280 1635 G09 240 140 – 50 –25 1M RL = 10k f = 1kHz 1000 0.12 1636 G10 300 10 100 FREQUENCY (Hz) f = 1kHZ 60 1k 0.05 1 260 80 50 10 0.10 Gain-Bandwidth Product vs Temperature VS = ±2.5V 60 0.15 1636 G08 1636 G07 70 0.20 1000 SLEW RATE (V/µs) 2 POWER SUPPLY REJECTION RATIO (dB) 1 0.25 0 30 0 0.30 50 40 30 70 VS = ±2.5V 60 POSITIVE SUPPLY 50 40 30 20 NEGATIVE SUPPLY 10 0 –10 – 20 20 1K 10K FREQUENCY (Hz) 100K 1636 G14 1k 10k FREQUENCY (Hz) 100k 1636 G15 LT1636 U W TYPICAL PERFOR A CE CHARACTERISTICS Gain-Bandwidth Product and Phase Margin vs Load Resistance 10k 80 VS = ± 2.5V 400 35 VS = ± 2.5V 70 300 50 250 40 200 30 150 20 AV = 100 100 AV = 10 10 AV = 1 OUTPUT SWING (VP-P) 60 PHASE MARGIN OUTPUT IMPEDANCE (Ω) 1k 350 100 20 15 10 1k 0.1 100 0 100k 10k LOAD RESISTANCE (Ω) 1k 10k FREQUENCY (Hz) 100 80 4 OVERSHOOT (%) AV = – 1 2 0 –2 AV = – 1 –4 AV = 1 –6 10 VS = 3V, 0V VOUT = 2VP-P VCM = 1.2V RL = 50k 1 70 AV = 1 60 AV = 2 THD + NOISE (%) AV = 1 Total Harmonic Distortion + Noise vs Frequency VS = ±2.5V ISOURCE = 40µA NO OUTPUT COMPENSATION 90 50 40 30 AV = 5 20 0.1 0.01 AV = 10 AV = – 1 AV = 1 10 –8 0 –10 40 60 80 100 120 140 160 SETTLING TIME (µs) 10 100 1000 CAPACITIVE LOAD (pF) 0.1 0.01 100 1k FREQUENCY (Hz) 10k 1636 G21 Total Harmonic Distortion + Noise vs Output Voltage 10 RL = 10k VCM = HALF SUPPLY f = 1kHz VS = 3V TOTAL AV = 1 VIN = 2VP-P AT 1kHz 1 10 1636 G20 Total Harmonic Distortion + Noise vs Load Resistance 10 0.001 10000 1636 G19 1 VS = ±1.5V VIN = ±1V THD + NOISE (%) 20 THD + NOISE (%) 0 100k 1635 G18 Capacitive Load Handling, Overshoot vs Capacitive Load VS = ±15V 6 1k 10k FREQUENCY (Hz) 1635 G17 Settling Time to 0.1% vs Output Step 8 0 100 100k 1636 G16 10 Vs = ± 2.5V 5 10 50 OUTPUT STEP (V) 25 1 GAIN BANDWIDTH DISTORTION ≤ 1% AV = 1 Vs = ±15V 30 PHASE MARGIN (DEG) GAIN-BANDWIDTH PRODUCT (kHz) 450 Undistorted Output Swing vs Frequency Output Impedance vs Frequency VS = 3V, 0V VIN = 0.5V TO 2.5V AV = –1 VS = ±1.5V 0.1 AV = –1 VS = 3V, 0V 0.01 VS = 3V, 0V VIN = 0.2V TO 2.2V AV = 1 VS = ±1.5V AV = 1 VS = 3V, 0V 0.001 0.001 100 1k 10k LOAD RESISTANCE TO GROUND (Ω) 100k 1636 G22 0 1 2 OUTPUT VOLTAGE (VP-P) 3 1636 G23 7 LT1636 U W TYPICAL PERFOR A CE CHARACTERISTICS CHANGE IN INPUT OFFSET VOLTAGE (100µV/DIV) Open-Loop Gain Large-Signal Response A B A: RL = 2k B: RL = 10k C: RL = 50k B C C Small-Signal Response A 1636 G24 1636 G25 VS = ±15V AV = –1 VS = ±15V AV = 1 1636 G26 U W 0V 10V VS = ±15V –10V OUTPUT VOLTAGE (5V/DIV) U U APPLICATIONS INFORMATION Supply Voltage The positive supply pin of the LT1636 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 LT1636 is protected against reverse battery voltages up to 27V. In the event a reverse battery condition occurs, the supply current is less than 1nA. When operating the LT1636 on total supplies of 20V 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 LT1636 has two input stages, NPN and PNP (see 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 0.8V or more below V +, the PNP input stage is active and the input bias current is typically – 4nA. 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 10nA. Increases in temperature will 8 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 LT1636 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 3µA at room temperature. The input offset voltage is typically 600µV when operating above V +. The LT1636 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 1k 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 LT1636 is affected by input overdrive as shown in the typical performance curves. When monitoring voltages within 100mV of V + , gain should be taken to keep the output from clipping. The output of the LT1636 can be pulled up to 27V beyond V + with less than 1nA of leakage current, provided that V + is less than 0.5V. LT1636 U W U U APPLICATIONS INFORMATION 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. returned to ground. The typical performance photo of Open-Loop Gain for various loads shows the details. The LT1636 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 10,000pF, at all output currents. The LT1636 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 1nA. When the shutdown pin is brought 1.2V above V –, the supply current drops to about 4µA 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). 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 LT1636 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 LT1636 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V + – 0.8V). See the Typical Performance Characteristics curves. 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 Shutdown 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 ±1mV. LT1636 8 1 10k V– 1636 AI01 Figure 1. Input Offset Nulling 9 LT1636 U TYPICAL APPLICATIONS MUX Amplifier Waveforms MUX Amplifier 5V + VIN1 LT1636 SHDN VOUT – 5V + VIN2 LT1636 SHDN – VS = 5V VIN1 = 1.2kHz AT 4VP-P, VIN2 = 2.4kHz AT 2VP-P INPUT SELECT = 120Hz AT 5VP-P INPUT SELECT 1636 TA05 74HC04 Optional Output Compensation for Capacitive Loads Greater Than 200pF + VIN LT1636 CL ≤ 10,000pF – 0.22µF 150Ω 1636 TA09 W W SI PLIFIED SCHEMATIC 7 V+ Q1 Q13 D1 – IN SHDN 2µA Q25 Q23 R3 1k R2 30k 5 Q19 D2 2 Q2 R1 1M D3 Q21 R4 1k + 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 40k R6 40k R7 300Ω R8 300Ω 1 8 NULL 4 V– 1636 SS 10 LT1636 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. MS8 Package 8-Lead Plastic MSOP (LTC DWG # 05-08-1660) 0.040 ± 0.006 (1.02 ± 0.15) 0.007 (0.18) 0.118 ± 0.004* (3.00 ± 0.102) 0.034 ± 0.004 (0.86 ± 0.102) 8 7 6 5 0° – 6° TYP SEATING PLANE 0.012 (0.30) 0.0256 REF (0.65) TYP 0.021 ± 0.006 (0.53 ± 0.015) 0.006 ± 0.004 (0.15 ± 0.102) 0.118 ± 0.004** (3.00 ± 0.102) 0.192 ± 0.004 (4.88 ± 0.10) MSOP (MS8) 1197 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) 0.400* (10.160) MAX 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) 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 ± 0.003 (0.457 ± 0.076) 0.100 ± 0.010 (2.540 ± 0.254) N8 1197 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) 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) 0.004 – 0.010 (0.101 – 0.254) 8 7 6 5 0°– 8° TYP 0.016 – 0.050 0.406 – 1.270 0.014 – 0.019 (0.355 – 0.483) *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 0.050 (1.270) TYP 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) SO8 0996 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 11 LT1636 U TYPICAL APPLICATIONS Self-Buffered Micropower Reference Over-The-Top Comparator with Hysteresis 1M 4V TO 44V 3V TO 44V 10k IN1 (0V TO 44V) + – VOUT LT1636 – VOUT = 1.25V IOUT ≤ 10mA LT1636 + 1M 1N5711 1M 2N5087 10k IN2 (0V TO 44V) 1M 1M 0.1µF 2N5210 V HYSTERESIS = CC 100 1636 TA04 1636 TA03 Lamp Outage Detector Over-The-Top Current Sense 0.1V TO 44V R1 200Ω 3V 5V TO 44V 1M LAMP ON/OFF LT1634-1.25 100k 5k 5V – 0.5Ω LT1636 OUT RS 0.2Ω + LT1636 + VOUT (0V TO 4.3V) – ILOAD OUT = 0V FOR GOOD BULB 3V FOR OPEN BULB LOAD VOUT ILOAD = (RS)(R2/R1) R2 2k 1636 TA08 1636 TA07 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1460 Micropower Precision Series Reference Accuracy: 0.075% Max, Drift: 10ppm/°C Max, 2.5V, 5V, 10V Versions Available LT1466/LT1467 75µA Dual/Quad Rail-to-Rail Input and Output Op Amps 390µV VOS(MAX), Gain Bandwidth = 120kHz LT1490/LT1491 50µA Dual/Quad Rail-to-Rail Input and Output Op Amps 950µV VOS(MAX), Gain Bandwidth = 200kHz LT1495/LT1496 1.5µA Max, Dual/Quad Precision Rail-to-Rail Input and Output Op Amps 375µV VOS(MAX), 1.5µA Supply Current Max LT2078/LT2079 55µA Dual/Quad Precision Single Supply Op Amps 120µV VOS(MAX), Gain Bandwidth = 200kHz LT2178/LT2179 17µA Dual/Quad Precision Single Supply Op Amps 120µV VOS(MAX), Gain Bandwidth = 60kHz 12 Linear Technology Corporation 1636f LT/TP 1098 4K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com LINEAR TECHNOLOGY CORPORATION 1998