LT1783 1.25MHz, Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amp in SOT-23 U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Operates with Inputs Above V + Rail-to-Rail Input and Output Micropower: 300µA Supply Current Max Small SOT-23 Package Gain Bandwidth product: 1.25MHz Slew Rate: 0.42V/µs Low Input Offset Voltage: 800µV Max Single Supply Input Range: 0V to 18V High Output Current: 18mA Min Specified on 3V, 5V and ±5V Supplies Output Shutdown on 6-Lead Version Reverse Battery Protection to 18V High Voltage Gain: 1500V/mV Operating Temperature Range: – 40°C to 85°C U APPLICATIO S ■ ■ ■ ■ ■ ■ The input range of the LT1783 includes ground, and a unique feature of this device is its Over-The-TopTM operation capabilitity with either or both of its inputs above the positive rail. The inputs handle 18V both differential and common mode, independent of supply voltage. The input stage incorporates phase reversal protection to prevent false outputs from occurring even when the inputs are 9V below the negative supply. The LT1783 can drive loads up to 18mA and still maintain rail-to-rail capability. A shutdown feature on the 6-lead version can disable the part, making the output high impedance and reducing quiescent current to 5µA. The LT1783 op amp is available in the 5- and 6-lead SOT-23 packages. For applications requiring lower power, refer to the LT1782. Portable Instrumentation Battery- or Solar-Powered Systems 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®1783 is a 1.25MHz op amp available in the small SOT-23 package that operates on all single and split supplies with a total voltage of 2.5V to 18V. The amplifier draws less than 300µA of quiescent current and has reverse battery protection, drawing negligible current for reverse supply voltages up to 18V. TYPICAL APPLICATIO Distribution of Input Offset Voltage 25 Positive Supply Rail Current Sense 5V TO 18V 200Ω 5V 0.2Ω 200Ω LOAD ILOAD + LT1783 2N3904 – VOUT = 2Ω(ILOAD) 0V TO 4.3V 2k VS = 5V, 0V VCM = 2.5V PERCENTAGE OF AMPLIFIERS V+ 20 15 10 5 0 –900 1783 TA01 –600 –300 0 300 600 INPUT OFFSET VOLTAGE (µV) 900 1782 G25 1 LT1783 W W U W ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V + to V –) .............................. 18V Input Differential Voltage ........................................ 18V Input Pin Voltage to V – ............................... + 24V/– 10V Shutdown Pin Voltage Above V – ............................ 18V Shutdown Pin Current ....................................... ±10mA Output Short-Circuit Duration (Note 2) ........... Indefinite Operating Temperature Range (Note 10) – 40°C to 85°C Specified Temperature Range ...................... 0°C to 70°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 INFORMATION TOP VIEW 5 V OUT 1 V– 2 + ORDER PART NUMBER LT1783CS5 4 –IN +IN 3 ORDER PART NUMBER + 6 V OUT 1 V– 2 + – +IN 3 TOP VIEW + – 5 SHDN LT1783CS6 4 –IN S5 PACKAGE 5-LEAD PLASTIC SOT-23 S5 PART MARKING S6 PACKAGE 6-LEAD PLASTIC SOT-23 TJMAX = 150°C, θJA = 250°C/ W LTLF TJMAX = 150°C, θJA = 230°C/ W S6 PART MARKING LTIU Consult factory for Industrial and Military grade parts. ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. SYMBOL PARAMETER CONDITIONS VOS TA = 25°C 0°C ≤ TA ≤ 70°C ● 0°C ≤ TA ≤ 70°C VCM = 18V (Note 3) Input Offset Voltage Input Offset Voltage Drift (Note 7) IOS IB Input Offset Current Input Bias Current VCM = 18V (Note 3) SHDN or VS = 0V, VCM = 0V to 18V Input Bias Current Drift 0°C ≤ TA ≤ 70°C MIN TYP MAX UNITS 400 800 950 µV µV ● 2 5 µV/°C ● ● 4 8 7 nA µA ● ● 45 35 0.1 80 60 nA µA nA ● 0.06 nA/°C Input Noise Voltage 0.1Hz to 10Hz 0.6 µVP-P en Input Noise Voltage Density f = 1kHz 20 nV/√Hz in Input Noise Current Density f = 1kHz 0.14 pA/√Hz RIN Input Resistance Differential Common Mode, VCM = 0V to (VCC – 1V) Common Mode, VCM = 0V to 18V 1.3 1 0.5 MΩ GΩ MΩ CIN 0.65 0.3 Input Capacitance 5 Input Voltage Range ● 0 pF 18 V CMRR Common Mode Rejection Ratio (Note 3) VCM = 0V to VCC – 1V VCM = 0V to 18V (Note 6) ● ● 90 68 100 80 dB dB PSRR Power Supply Rejection Ratio VS = 3V to 12.5V, VCM = VO = 1V ● 90 100 dB AVOL Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0°C ≤ TA ≤ 70°C 200 133 1500 ● V/mV V/mV VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0°C ≤ TA ≤ 70°C 400 250 1500 ● V/mV V/mV 2 LT1783 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C. VS = 3V, 0V; VS = 5V, 0V, VCM = VOUT = half supply, for the 6-lead part VPIN5 = 0V, pulse power tested unless otherwise specified. SYMBOL PARAMETER CONDITIONS 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 ● ● 2.91 2.6 2.94 2.8 V V VS = 5V, No Load VS = 5V, ISOURCE = 10mA ● ● 4.91 4.5 4.94 4.74 V V VS = 3V, Short to GND VS = 3V, Short to VCC 5 15 10 30 mA mA VS = 5V, Short to GND VS = 5V, Short to VCC 15 20 30 40 mA mA ISC Short-Circuit Current (Note 2) Minimum Supply Voltage Reverse Supply Voltage IS MIN Supply Current (Note 4) ● MAX UNITS 3 200 330 8 400 600 mV mV mV 2.5 ● IS = –100µA TYP 2.7 18 V V 210 300 350 µA µA ● Supply Current, SHDN VPIN5 = 2V, No Load (Note 8) ● 5 18 µA Shutdown Pin Current VPIN5 = 0.3V, No load (Note 8) VPIN5 = 2V, No Load (Note 8) VPIN5 = 5V, No Load (Note 8) ● ● 0.5 2 5 8 nA µA µA Shutdown Output Leakage Current VPIN5 = 2V, No Load (Note 8) ● 0.05 1 µA Maximum Shutdown Pin Current VPIN5 = 18V, No Load (Note 8) ● 10 30 µA VL Shutdown Pin Input Low Voltage (Note 8) ● 0.3 V VH Shutdown Pin Input High Voltage (Note 8) ● tON Turn-On Time VPIN5 = 5V to 0V, RL = 10k (Note 8) 25 µs tOFF Turn-Off Time VPIN5 = 0V to 5V, RL = 10k (Note 8) 3 µs GBW Gain Bandwidth Product (Note 3) f = 5kHz 0°C ≤ TA ≤ 70°C 750 600 1250 ● kHz kHz Slew Rate (Note 5) AV = –1, RL = ∞ 0°C ≤ TA ≤ 70°C 0.24 0.21 0.42 ● V/µs V/µs ISHDN SR 2 V FPBW Full-Power Bandwidth (Note 9) VOUT = 2VP-P 66 kHz tS Settling Time VS = 5V, ∆VOUT = 2V to 0.1%, AV = –1 12 µs THD Distortion VS = 3V, VO = 2VP-P, AV = 1, RL = 10k, f = 1kHz 0.001 % VS = ±5V, VCM = 0V,VOUT = 0V, for the 6-lead part VSHDN = V– VOS Input Offset Voltage Input Offset Voltage Drift (Note 7) IOS Input Offset Current IB Input Bias Current TA = 25°C 0°C ≤ TA ≤ 70°C ● 0°C ≤ TA ≤ 70°C Input Bias Current Drift 0°C ≤ TA ≤ 70°C Input Noise Voltage 0.1Hz to 10Hz µV µV 500 900 1050 ● 2 5 µV/°C ● 4 8 nA ● 40 80 ● 0.06 nA/°C 1 µVP-P nA en Input Noise Voltage Density f = 1kHz 20 nV/√Hz in Input Noise Current Density f = 1kHz 0.14 pA/√Hz 3 LT1783 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the specified temperature range, otherwise specifications are TA = 25°C. VS = ±5V, VCM = 0V,VOUT = 0V, for the 6-lead part VSHDN = V–, unless otherwise specified. SYMBOL PARAMETER CONDITIONS RIN Input Resistance Differential Common Mode, VCM = –5V to 13V CIN Input Capacitance Input Voltage Range ● ● MIN TYP 0.65 0.3 1.3 0.5 MΩ MΩ 5 pF ● –5 MAX 13 UNITS V CMRR Common Mode Rejection Ratio VCM = –5V to 13V ● 68 80 dB AVOL Large-Signal Voltage Gain VO = ±4V, RL= 10k 0°C ≤ TA ≤ 70°C 160 ● 70 50 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 ● ● ● 4.91 4.6 4.5 4.94 4.8 4.74 ISC Short-Circuit Current (Note 2) Short to GND 0°C ≤ TA ≤ 70°C 18 15 30 ● VS = ±1.5V to ±9V ● 90 PSRR Power Supply Rejection Ratio IS Supply Current –4.997 –4.8 –4.67 –4.992 –4.6 –4.4 V V V V V V mA mA 100 dB 230 325 375 µA µA ● Supply Current, SHDN VPIN5 = –3V, VS = ±5V, No Load (Note 8) ● 6 20 µA Shutdown Pin Current VPIN5 = –4.7V, VS = ±5V, No load (Note 8) VPIN5 = –3V, VS = ±5V, No Load (Note 8) ● ● 0.5 2 8 nA µA Maximum Shutdown Pin Current VPIN5 = 9V, VS = ±9V (Note 8) ● 10 30 µA Shutdown Output Leakage Current VPIN5 = –7V, VS = ±9V, No Load (Note 8) ● 0.05 1 µA VL Shutdown Pin Input Low Voltage VS = ±5V (Note 8) ● –4.7 V VH Shutdown Pin Input High Voltage VS = ±5V (Note 8) ● tON Turn-On Time VPIN5 = 0V to –5V, RL = 10k (Note 8) ● 25 µs tOFF Turn-Off Time VPIN5 = –5V to 0V, RL = 10k (Note 8) ● 3 µs GBW Gain Bandwidth Product f = 5kHz 0°C ≤ TA ≤ 70°C 800 700 1300 ● kHz kHz AV = –1, RL = ∞, VO = ±4V, Measured at VO = ±2V 0°C ≤ TA ≤ 70°C 0.26 0.23 0.45 ● V/µs V/µs ISHDN SR Slew Rate –2.8 V FPBW Full-Power Bandwidth (Note 9) VOUT = 8VP-P 18 kHz tS Settling Time ∆VOUT = 4V to 0.1%, AV = 1 10 µs 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: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = ±5V or VS = ±9V tests. Note 4: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = ±5V or VS = ±9V tests. Note 5: Guaranteed by correlation to slew rate at VS = ±5V, and GBW at VS = 3V and VS = ±5V tests. 4 Note 6: This specification implies a typical input offset voltage of 1.8mV at VCM = 18V and a maximum input offset voltage of 7.2mV at VCM = 18V. Note 7: This parameter is not 100% tested. Note 8: Specifications apply to 6-lead SOT-23 with shutdown. Note 9: Full-power bandwidth is calculated from the slew rate. FPBW = SR/2πVP. Note 10: The LT1783 is guaranteed functional over the operating temperature range – 40°C to 85°C. LT1783 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage 400 280 TA = 125°C 260 240 TA = 25°C 220 200 180 TA = –55°C 160 140 5 VS = 5V, 0V 300 4 200 100 TA = –55°C VOUT (V) INPUT OFFSET VOLTAGE CHANGE (µV) 300 0 TA = 125°C –100 TA = 25°C –200 2 4 6 8 10 12 14 SUPPLY VOLTAGE (V) 16 18 1 2 3 4 TOTAL SUPPLY VOLTAGE (V) 0 10000 250 200 TA = –55°C 150 100 TA = 25°C 50 TA = 125°C 0 OUTPUT SATURATION VOLTAGE (V) Output Saturation Voltage vs Load Current (Output Low) 1 VS = ±2.5V VOD = 30mV TA = 125°C 0.1 TA = –55°C TA = 25°C VS = ±2.5V VOD = 30mV TA = 125°C 0.1 0.01 TA = 25°C TA = –55°C 0.01 1µ –50 3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 14 16 18 COMMON MODE VOLTAGE (V) 10µ 100µ 1m SOURCING LOAD CURRENT (A) 10m 0.001 10µ 100µ 1m SINKING LOAD CURRENT (A) 1µ 1783 G04 1783 G03 Output Saturation Voltage vs Input Overdrive 1783 G05 Output Short-Circuit Current vs Temperature 100 10m 0.1Hz to 10Hz Noise Voltage 55 VS = ±2.5V VS = ±5V OUTPUT HIGH OUTPUT CURRENT (mA) 50 10 OUTPUT LOW 1 10 20 30 40 50 INPUT OVERDRIVE (mV) SOURCING CURRENT 45 40 SINKING CURRENT 35 VS = ±2.5V NO LOAD 0 NOISE VOLTAGE (400nV/DIV) INPUT BIAS CURRENT (nA) 1783 G02a 1 50000 OUTPUT SATURATION VOLTAGE (mV) 0 –10–8 –6 –4 –2 0 2 4 6 8 10 12 14 16 18 VIN (V) 5 Output Saturation Voltage vs Load Current (Output High) 20000 – 1783 G02 Input Bias Current vs Common Mode Voltage 30000 + 1 1783 G01 40000 5V 2 –300 –400 120 3 VIN OUTPUT SATURATION VOLTAGE (V) SUPPLY CURRENT (µA) Output Voltage vs Large Input Voltage Minimum Supply Voltage 60 1783 G06 30 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 125 1783 G06a 0 1 2 3 4 5 6 TIME (sec) 7 8 9 10 1783 G07 5 LT1783 U W TYPICAL PERFOR A CE CHARACTERISTICS Noise Voltage Density vs Frequency 70 60 50 40 30 20 1 100 1k FREQUENCY (Hz) 10 VS = ±2.5V 2.5 1.5 1.0 0.5 0 10 100 1k FREQUENCY (Hz) 60 30 40 20 20 GAIN 10 0 0 –20 –10 –40 –20 –60 1k 10k 1783 G08 10k 1783 G10 Slew Rate vs Temperature 1400 0.8 VS = ±5V f = 5kHz VS = ±2.5V 0.7 SLEW RATE (V/µs) 1350 1300 1250 1200 1150 RISING 0.6 0.5 FALLING 0.4 0.3 1100 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 0.2 –50 125 –25 0 25 50 75 TEMPERATURE (°C) 100 1783 G11 125 1783 G12 Gain Bandwidth Product and Phase Margin vs Supply Voltage Gain Bandwidth and Phase Margin vs Load Resistance PHASE MARGIN PHASE MARGIN (DEG) 60 65 60 PHASE MARGIN 55 55 GAIN BAINDWIDTH PRODUCT (kHz) GAIN BAINDWIDTH PRODUCT (kHz) 1300 GAIN BANDWIDTH PRODUCT 1250 1200 0 2 4 6 8 10 12 14 16 TOTAL SUPPLY VOLTAGE (V) 18 1783 G13 1400 GAIN BANDWIDTH PRODUCT 1200 VS = 2.5V AV = –1 RF = RG = 10k f = 5kHz 1000 800 1k 10k LOAD RESISTANCE (Ω) 100k 1783 G14 PHASE MARGIN (DEG) 65 AV = –1 RF = RG = 10k f = 5kHz 6 –80 10M 100k 1M FREQUENCY (Hz) 1783 G09 Gain Bandwidth Product vs Temperature GAIN BANDWIDTH (kHz) 80 40 –30 1 100 PHASE 50 2.0 10k 120 VS = ±2.5V 60 GAIN (dB) INPUT NOISE CURRENT DENSITY (pA/√Hz) 3.0 VS = ±2.5V PHASE SHIFT (DEG) INPUT NOISE VOLTAGE DENSITY (nV/√Hz) 70 10 Gain and Phase Shift vs Frequency Input Noise Current vs Frequency LT1783 U W TYPICAL PERFOR A CE CHARACTERISTICS PSRR vs Frequency CMRR vs Frequency 60 POSITIVE SUPPLY 50 40 30 NEGATIVE SUPPLY 20 10 0 10k 100k FREQUENCY (Hz) 1k VS = ±2.5V 100 AV = 100 90 80 70 60 50 10 AV = 10 1 0.1 AV = 1 40 30 10k 1M 100 VS = ±2.5V OUTPUT IMPEDANCE (Ω) 70 –10 Output Impedance vs Frequency 110 VS = ±2.5V 80 COMMON MODE REJECTION RATIO (dB) POWER SUPPLY REJECTION RATIO (dB) 90 100k FREQUENCY (Hz) 0.01 100 1M 1k 10k 100k FREQUENCY (Hz) 1M 1783 G15 1783 G17 1783 G16 Disabled Output Impedance vs Frequency (Note 8) Settling Time to 0.1% vs Output Step 1M 4 40 3 35 AV = –1 1k OVERSHOOT (%) 10k 1 VS = ±5V 0 –1 100 100 1k AV = 1 AV = –1 0 2 4 0.010 0.1 THD + NOISE (%) 0.1 THD + NOISE (%) OUTPUT SWING (VP-P) 1 VS = 3V, 0V VOUT = 2VP-P VCM = 1.2V RL = 10k VS = ±5V VS = ±2.5V AV = –1 0 100 0.01 VS = 3V, 0V VIN = 0.5V TO 2.5V VS = 3V, 0V VIN = 0.2V TO 2.2V AV = 1 DISTORTION ≤ 1% AV = 1 0.0001 1k 10k FREQUENCY (Hz) 100k 1783 G20 VS = ±1.5V VIN = ±1V VS = 3V TOTAL AV = 1 VIN = 2VP-P AT 1kHz 0.001 0.001 2 10000 Total Harmonic Distortion + Noise vs Load Resistance 1 12 6 100 1000 CAPACITIVE LOAD (pF) 1783 G19 Total Harmonic Distortion + Noise vs Frequency 8 AV = 10 1783 G18 Undistorted Output Swing vs Frequency 4 AV = 5 10 6 8 10 12 14 16 18 20 SETTLING TIME (µs) 1783 G17a 10 AV = 1 15 0 –4 1M 20 5 –3 10k 100k FREQUENCY (Hz) 25 10 –2 VS = ±2.5V VPIN5 (SHUTDOWN) = 2.5V VS = 5V, 0V VCM = 2.5V 30 2 OUTPUT STEP (V) OUTPUT IMPEDANCE (Ω) AV = 1 100k Capacitive Load Handling Overshoot vs Capacitive Load 10 100 1k 10k FREQUENCY (Hz) 100k 1783 G21 0.0001 100 1k 10k LOAD RESISTANCE TO GROUND (Ω) 100k 1783 G22 7 LT1783 U W TYPICAL PERFOR A CE CHARACTERISTICS Total Harmonic Distortion + Noise vs Output Voltage Amplitude AV = –1 RF = RG = 100k VS = 3V, 0V VCM = 1.5V 0.1 AV = 1 VS = 3V, 0V VCM = 1.5V 0.01 AV = 1 VS = ±1.5V VCM = 0V 0.001 0 1 2 OUTPUT VOLTAGE AMPLITUDE (VP-P) RL = 2k RL = 10k RL = 50k –6 –5 –4 –3 –2 –1 0 1 2 3 OUTPUT VOLTAGE (V) 3 275 VS = ±5V SUPPLY CURRENT PER AMPLIFIER (µA) AV = –1 RF = RG = 100k VS = ±1.5V VCM = 0V 1 THD + NOISE (%) INPUT OFFSET VOLTAGE CHANGE (50µV/DIV) 10 Supply Current vs SHDN Pin Voltage Open-Loop Gain 1783 G23 4 5 6 250 TA = 125°C 225 200 VS = 5V, 0V TA = 25°C 175 150 TA = –55°C 125 100 75 50 25 0 0 0.5 1 1.5 2 SHUTDOWN PIN VOLTAGE (V) 1783 G24 2.5 1783 G25 Small-Signal Response Large-Signal Response VS = ±5V AV = 1 CL = 15pF VS = ±5V AV = 1 CL = 15pF 1783 G26 1783 G27 U W U U APPLICATIO S I FOR ATIO Supply Voltage Inputs The positive supply pin of the LT1783 should be bypassed with a small capacitor (typically 0.1µF) 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 LT1783 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. The LT1783 is protected against reverse battery voltages up to 18V. In the event a reverse battery condition occurs, the supply current is less than 1nA. 8 For input voltages about 0.8V or more below V +, the PNP input stage is active and the input bias current is typically –40nA. When the input common mode voltage is within 0.5V of the positive rail, the NPN stage is operating and the LT1783 U W U U APPLICATIO S I FOR ATIO input bias current is typically 80nA. Increases in temperature will cause the voltage at which operation switches from the PNP input stage to the NPN input stage to move towards V +. The input offset voltage of the NPN stage is untrimmed and is typically 1.8mV. A Schottky diode in the collector of the input transistors, along with special geometries for these NPN transistors, allow the LT1783 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 30µA at room temperature. The input offset voltage is typically 1.8mV when operating above V +. The LT1783 will operate with its inputs 18V above V – regardless of V +. The inputs are protected against excursions as much as 10V below V – by an internal 1k resistor in series with each input and a diode from the input to the negative supply. The input stage of the LT1783 incorporates phase reversal protection to prevent the output from phase reversing for inputs up to 9V below V –. There are no clamping diodes between the inputs and the maximum differential input voltage is 18V. Output The output of the LT1783 can swing to within 60mV of the positive rail with no load and within 3mV of the negative rail with no load. When monitoring input voltages within 60mV of the positive rail or within 3mV of the negative rail, gain should be taken to keep the output from clipping. The LT1783 can sink and source over 30mA at ±5V supplies, sourcing current is reduced to 10mA at 3V total supplies as noted in the Electrical Characteristics. The LT1783 is internally compensated to drive at least 400pF 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. Distortion There are two main contributors to distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current, and distortion caused by nonlinear common mode rejection. If the op amp is operating inverting, there is no common mode induced distortion. If the op amp is operating in the PNP input stage (input is not within 0.8V of V +), the CMRR is very good, typically 100dB. When the LT1783 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 LT1783 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, “Total Harmonic Distortion + Noise vs Output Voltage Amplitude.” Gain The open-loop gain is almost independent of load when the output is sourcing current. This optimizes performance in single supply applications where the load is returned to ground. The typical performance curve of open-loop gain for various loads shows the details. Shutdown The 6-lead part includes a shutdown feature that disables the part, reducing quiescent current and making the output high impedance. The part can be shut down by bringing the SHDN pin 1.2V or more above V –. When shut down, the supply current is about 5µA and the output leakage current is less than 1µA (V – ≤ VOUT ≤ V +). In normal operation, the SHDN pin can be tied to V – or left floating. See the Typical Performance Characteristics curves, “Supply Current vs Shutdown Voltage.” 9 LT1783 W W SI PLIFIED SCHE ATIC V+ Q2 Q1 Q3 D1 SHDN R1 6k R2 1k Q4 Q19 – IN Q17 + J1 Q7 R3 1k 10µA Q11 Q8 OUT +IN Q5 Q18 Q15 Q9 Q24 Q20 Q12 Q16 Q26 Q25 Q23 Q22 D3 Q6 D4 Q10 Q13 Q14 R5 8k R4 8k D5 Q21 V– 1783 SS U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. S5 Package 5-Lead Plastic SOT-23 (LTC DWG # 05-08-1633) 2.80 – 3.00 (0.110 – 0.118) (NOTE 3) 2.60 – 3.00 (0.102 – 0.118) 1.50 – 1.75 (0.059 – 0.069) 0.35 – 0.55 (0.014 – 0.022) 1.90 (0.074) REF 0.00 – 0.15 (0.00 – 0.006) 0.09 – 0.20 (0.004 – 0.008) (NOTE 2) 0.90 – 1.45 (0.035 – 0.057) 0.35 – 0.50 0.90 – 1.30 (0.014 – 0.020) (0.035 – 0.051) FIVE PLACES (NOTE 2) S5 SOT-23 0599 NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ) 10 0.95 (0.037) REF LT1783 U PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted. S6 Package 6-Lead Plastic SOT-23 (LTC DWG # 05-08-1634) 2.80 – 3.00 (0.110 – 0.118) (NOTE 3) PIN 1 1.90 (0.074) REF 2.6 – 3.0 (0.110 – 0.118) 1.50 – 1.75 (0.059 – 0.069) 0.35 – 0.55 (0.014 – 0.022) 0.00 – 0.15 (0.00 – 0.006) 0.09 – 0.20 (0.004 – 0.008) (NOTE 2) 0.95 (0.037) REF 0.90 – 1.45 (0.035 – 0.057) 0.35 – 0.50 0.90 – 1.30 (0.014 – 0.020) (0.035 – 0.051) SIX PLACES (NOTE 2) S6 SOT-23 0898 NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ) 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. 11 LT1783 U TYPICAL APPLICATIO S Current Source VCC LT1634-1.25 R1 + LT1783 2N3906 – IOUT = 1.25V R1 1783 TA02 Protected Fault Conditions OK! –18V OK! 5V V+ V+ LT1783 LT1783 + 24V REVERSE BATTERY 18V 5V + OK! LT1783 LT1783 10V INPUT DIFFERENTIAL VOLTAGE 5V + OK! INPUT OVERVOLTAGE INPUTS BELOW GROUND 1783 TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1782 Micropower, Over-The-Top SOT-23 Rail-to-Rail Input and Output Op Amp SOT-23 Package, Micropower 40µA per Amplifier, Rail-to-Rail Input and Output , 200kHz 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, 0.4V/µs, Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps 170µA Supply Current, Single Supply Input Range: –0.4V to 44V, Rail-to-Rail Input and Output 12 Linear Technology Corporation 1783f LT/TP 0400 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 1999