LTIW

FEATURES s s s s s s s s s s s s s s LT1784 2.5MHz, Over-The-Top Low Power, Rail-to-Rail Input and Output Op Amp in SOT-23 DESCRIPTIO The LT®1784 is a 2.5MHz 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 750µA of quiescent current and has reverse battery protection, drawing negligible current for reverse supply voltages up to 18V. The input range of the LT1784 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 LT1784 can drive loads up to 15mA 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 LT1784 op amp is available in the 5- and 6-lead SOT-23 packages. For applications requiring lower power, refer to the LT1782 and LT1783 data sheets. , LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top and ThinSOT are trademarks of Linear Technology Corporation. Operates with Inputs Above V + Rail-to-Rail Input and Output Low Profile (1mm) ThinSOTTM Package Gain Bandwidth Product: 2.5MHz Slew Rate: 2.1V/µs Low Input Offset Voltage: 3.5mV Max High Voltage Gain: 1000V/mV Single Supply Input Range: 0V to 18V Specified on 3V, 5V and ± 5V Supplies Reverse Battery Protection to 18V Low Power: 750µA Supply Current Max Output Shutdown on 6-Lead Version High Output Current: 15mA Min Operating Temperature Range: – 40°C to 85°C APPLICATIO S s s s s s s Portable Instrumentation Battery-Powered Systems Sensor Conditioning Supply Current Sensing MUX Amplifiers 4mA to 20mA Transmitters TYPICAL APPLICATIO VCC AV = 20 AV = 2 SHDN IN SHDN VCC Programmable Gain, AV = 2, AV = 20, 100kHz Amplifier Programmable Gain Amplifier Frequency Response 30 25 AV = 20 VCC 20 15 + LT1784 OUT GAIN (dB) 10 5 0 –5 AV = 2 – VEE + LT1782 – VEE R2 9.09k R3 1k R1 10k AV = 1+ OR 1+ ( ( R1 + R2 R3 R1 R2 + R3 ) ) 1784 TA01 –10 –15 –20 1k 10k 100k 1M FREQUENCY (Hz) 10M 1784 TA01a U U U 1 LT1784 ABSOLUTE MAXIMUM RATINGS 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 PACKAGE/ORDER INFORMATION TOP VIEW OUT 1 V– 2 +IN 3 +– ORDER PART NUMBER 5 V+ OUT 1 4 –IN LT1784CS5 LT1784IS5 S5 PART MARKING LTJD LTSN S5 PACKAGE 5-LEAD PLASTIC SOT-23 TJMAX = 150°C, θJA = 250°C/ W Consult LTC marketing for parts specified with wider operating temperature ranges. The q 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 VOS Input Offset Voltage CONDITIONS TA = 25°C 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C – 40°C ≤ TA ≤ 85°C VCM = 18V (Note 3) IB Input Bias Current VCM = 18V (Note 3) SHDN or VS = 0V, VCM = 0V to 18V ∆IB/∆T en in RIN Input Bias Current Drift Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Resistance – 40°C ≤ TA ≤ 85°C 0.1Hz to 10Hz f = 10kHz f = 10kHz Differential Common Mode, VCM = 0V to (VCC – 1.2V) Common Mode, VCM = 0V to 18V q q q q q q q q q ELECTRICAL CHARACTERISTICS ∆VOS/∆T Input Offset Voltage Drift (Note 7) IOS Input Offset Current CIN VCM Input Capacitance Input Voltage Range 0 2 U U W WW U W (Note 1) Operating Temperature Range (Note 10) – 40°C to 85°C Specified Temperature Range (Note 11) – 40°C to 85°C Junction Temperature........................................... 150°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C TOP VIEW + 6V +– ORDER PART NUMBER 5 SHDN 4 –IN V– 2 +IN 3 LT1784CS6 LT1784IS6 S6 PART MARKING LTIW LTIX S6 PACKAGE 6-LEAD PLASTIC SOT-23 TJMAX = 150°C, θJA = 230°C/ W MIN TYP 1.5 MAX 3.5 4.2 4.5 15 50 50 500 400 UNITS mV mV mV µV/°C nA µA nA µA nA nA/°C µVP-P nV/√Hz pA/√Hz kΩ MΩ kΩ pF 5 25 250 225 0.1 0.4 1.5 25 0.3 100 45 200 150 80 5 18 V LT1784 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CMRR PSRR AVOL Common Mode Rejection Ratio (Note 3) Power Supply Rejection Ratio Large-Signal Voltage Gain CONDITIONS The q 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. MIN q q q q q q q q q q q q q q TYP 95 70 100 1000 MAX UNITS dB dB dB V/mV V/mV V/mV V/mV V/mV V/mV VCM = 0V to VCC – 1.2V VCM = 0V to 18V (Note 6) VS = 3V to 12.5V, VCM = VO = 1V 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 84 60 90 133 90 60 266 180 120 1000 VOL Output Voltage Swing LOW No Load ISINK = 5mA VS = 5V, ISINK = 10mA VS = 3V, No Load VS = 3V, ISOURCE = 3mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA 4 200 350 2.885 2.600 4.885 4.400 4 15 12.5 20.0 2.93 2.8 4.93 4.7 7.5 30 22 40 2.5 18 500 10 400 600 mV mV mV V V V V mA mA mA mA VOH Output Voltage Swing HIGH ISC Short-Circuit Current (Note 2) VS = 3V, Short to GND VS = 3V, Short to VCC VS = 5V, Short to GND VS = 5V, Short to VCC Minimum Supply Voltage Reverse Supply Voltage IS Supply Current (Note 4) Supply Current, Shutdown ISHDN SHDN Pin Current VPIN5 = 2V, No Load (Note 8) VPIN5 = 0.3V (On), No load (Note 8) VPIN5 = 2V (Shutdown), No Load (Note 8) VPIN5 = 5V (Shutdown), No Load (Note 8) VPIN5 = 2V, No Load (Note 8) VPIN5 = 18V, No Load (Note 8) (Note 8) (Note 8) VPIN5 = 5V to 0V, RL = 10k (Note 8) VPIN5 = 0V to 5V, RL = 10k (Note 8) f = 5kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C AV = –1, RL = ∞ 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C VOUT = 2VP-P VS = 5V, ∆VOUT = 2V to 0.1%, AV = – 1 VS = 3V, VO = 1.8VP-P, AV = 1, RL = 10k, f = 1kHz IS = –100µA q q q q q q q q q q 2.7 750 900 18 8 1 30 0.3 V V µA µA µA nA µA µA µA µA V V µs µs MHz MHz MHz V/µs V/µs V/µs kHz µs % 7 0.5 2.0 5.0 0.05 10 2 18 2.2 1.5 1.2 1.1 1.2 1.1 1.0 2.5 Output Leakage Current, Shutdown Maximum SHDN Pin Current VIL VIH tON tOFF GBW SHDN Pin Input Low Voltage SHDN Pin Input High Voltage Turn-On Time Turn-Off Time Gain Bandwidth Product (Note 4) Slew Rate (Note 5) Full-Power Bandwidth (Note 9) Settling Time Distortion q q q q SR 2.1 FPBW tS THD 350 3.7 0.001 3 LT1784 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS The q 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 VPIN5 = V –, pulse power tested unless otherwise specified. MIN q q q q q TYP 1.6 MAX 3.75 4.50 4.80 15 50 500 UNITS mV mV mV µV/°C nA nA nA/°C µVP-P nV/√Hz pA/√Hz kΩ kΩ pF TA = 25°C 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C –40°C ≤ TA ≤ 85°C ∆VOS/∆T Input Offset Voltage Drift (Note 7) IOS IB ∆IB/∆T en in RIN CIN VCM CMRR AVOL VOL Input Offset Current Input Bias Current Input Bias Current Drift 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 Output Voltage Swing LOW 5 25 250 0.4 1.5 25 0.3 0°C ≤ TA ≤ 70°C 0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = –5V to 13V q q q 100 45 –5 60 50 35 200 80 5 13 70 100 – 4.996 – 4.800 – 4.650 – 4.99 – 4.60 – 4.40 q V dB V/mV V/mV V V V V V V mA mA dB VCM = –5V to 13V VO = ±4V, RL= 10k 0°C ≤ TA ≤ 70°C No Load ISINK = 5mA ISINK = 10mA No Load ISOURCE = 5mA ISOURCE = 10mA Short to GND 0°C ≤ TA ≤ 70°C VS = ±1.5V to ±9V q q q q q q q q q q q VOH Output Voltage Swing HIGH 4.885 4.550 4.400 15 10 90 4.92 4.75 4.65 27 100 540 800 975 20 8 30 1 – 4.7 ISC PSRR IS Short-Circuit Current (Note 2) Power Supply Rejection Ratio Supply Current Supply Current, Shutdown µA µA µA nA µA µA µA V V µs µs MHz MHz MHz VPIN5 = –3V, VS = ±5V, No Load (Note 8) VPIN5 = –4.7V (On), VS = ±5V, No load (Note 8) VPIN5 = –3V (Shutdown), VS = ±5V, No Load (Note 8) VPIN5 = 9V, VS = ±9V (Note 8) VPIN5 = –7V, VS = ±9V, No Load (Note 8) VS = ±5V (Note 8) VS = ±5V (Note 8) VPIN5 = 0V to –5V, RL = 10k (Note 8) VPIN5 = –5V to 0V, RL = 10k (Note 8) f = 5kHz 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C q q q q q q q q q q q 8 0.5 2.0 10 0.05 –3 18 2.2 1.55 1.30 1.20 2.6 ISHDN SHDN Pin Current Maximum SHDN Pin Current Output Leakage Current, Shutdown VIL VIH tON tOFF GBW SHDN Pin Input Low Voltage SHDN Pin Input High Voltage Turn-On Time Turn-Off Time Gain Bandwidth Product 4 LT1784 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER SR Slew Rate CONDITIONS The q 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 VPIN5 = V –, pulse power tested unless otherwise specified. MIN q q TYP 2.2 MAX UNITS V/µs V/µs V/µs kHz µs AV = –1, RL = ∞, VO = ±4V, Measured at VO = ±2V 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C VOUT = 8VP-P VS = 5V, ∆VOUT = 4V to 0.1%, AV = 1 1.3 1.2 1.1 FPBW tS Full-Power Bandwidth (Note 9) Settling Time 94 3.4 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 = 5V and VS = ± 5V tests. Note 6: This specification implies a typical input offset voltage of 5.7mV at VCM = 18V and a maximum input offset voltage of 18mV 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 LT1784C is guaranteed functional over the operating temperature range – 40°C to 85°C. Note 11: The LT1784C is guaranteed to meet specified performance from 0°C to 70°C. The LT1784C 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. LT1784I is guaranteed to meet specified performance from – 40°C to 85°C. TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage 700 650 SUPPLY CURRENT (µA) INPUT OFFSET VOLTAGE CHANGE (µV) 600 550 500 450 400 350 300 2 TA = 125°C TA = 25°C 0 TA = 125°C TA = – 55°C –100 –200 –300 –400 1 TA = 25°C VOUT (V) 4 8 10 12 14 6 SUPPLY VOLTAGE (V) UW 16 1784 G01 Minimum Supply Voltage 400 300 4 200 100 TA = – 55°C 3 5 Output Voltage vs Large Input Voltage VS = 5V, 0V 2 VIN 1 + – 5V 18 3 2 4 TOTAL SUPPLY VOLTAGE (V) 5 1784 G02 0 –10 –6 –2 6 2 VIN (V) 10 14 18 1784 G03 5 LT1784 TYPICAL PERFOR A CE CHARACTERISTICS Input Bias Current vs Common Mode Voltage 300,000 250,000 200,000 VS = 5V, 0V OUTPUT SATURATION VOLTAGE (V) 150,000 100,000 TA = 25°C 800 600 400 200 0 –200 –400 3.5 4.5 5 5.5 14 16 18 4 COMMON MODE VOLTAGE (V) 1784 G04 OUTPUT SATURATION VOLTAGE (V) INPUT BIAS CURRENT (nA) TA = – 55°C TA = 125°C Output Saturation Voltage vs Input Overdrive 100 OUTPUT SATURATION VOLTAGE (mV) 50 OUTPUT HIGH 45 OUTPUT CURRENT (mA) 40 SINKING 35 10 OUTPUT LOW 30 VS = ± 2.5V NO LOAD 1 0 10 20 30 40 50 INPUT OVERDRIVE (mV) 60 1784 G07 SOURCING 25 –50 –25 50 75 0 25 TEMPERATURE (°C) 100 125 NOISE VOLTAGE (400nV/DIV) Noise Voltage Density vs Frequency 100 INPUT NOISE VOLTAGE DENSITY (nV/√Hz) 90 80 70 60 50 40 30 20 10 0 1 10 100 1k FREQUENCY (Hz) 10k 100k 1784 G10 INPUT NOISE CURRENT DENSITY (pA/√Hz) VS = ± 2.5V GAIN (dB) 6 UW Output Saturation Voltage vs Load Current (Output High) 1 VS = ± 2.5V VOD = 30mV 1 Output Saturation Voltage vs Load Current (Output Low) VS = ± 2.5V VOD = 30mV 0.1 TA = 25°C 0.01 TA = – 55°C 0.001 1 TA = 125°C 0.1 TA = 125°C TA = 25°C TA = – 55°C 0.01 1 100 10 1000 SOURCING LOAD CURRENT (µA) 10000 1784 G05 10 100 1000 SINKING LOAD CURRENT (µA) 10000 1784 G06 Output Short-Circuit Current vs Temperature VS = ± 5V 0.1Hz to 10Hz Noise Voltage VS = ± 2.5V 0 1 2 3 456 TIME (sec) 7 8 9 10 DC194 G02 1784 G09 Input Noise Current vs Frequency 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1 10 100 1k FREQUENCY (Hz) 10k 100k 1784 G11 Gain and Phase Shift vs Frequency 70 60 50 40 30 20 10 0 –10 –20 –30 1k 10k 100k 1M FREQUENCY (Hz) GAIN VS = ± 2.5V PHASE 120 100 80 60 PHASE (DEG) VS = ± 2.5V 40 20 0 –20 –40 –60 –80 10M 1784 G12 LT1784 TYPICAL PERFOR A CE CHARACTERISTICS Gain Bandwidth Product vs Temperature 2.8 GAIN BANDWIDTH PRODUCT (MHz) 2.7 RISING GAIN BANDWIDTH PRODUCT (MHz) VS = ± 2.5V f = 5kHz 2.6 2.5 2.4 2.3 2.2 –50 –25 SLEW RATE (V/µs) 50 25 75 0 TEMPERATURE (°C) Gain Bandwidth and Phase Margin vs Load Resistance 65 90 POWER SUPPLY REJECTION RATIO (dB) COMMON MODE REJECTION RATIO (dB) GAIN BANDWIDTHPRODUCT (MHz) PHASE MARGIN 2.6 2.4 2.2 2.0 1k GAIN BANDWIDTH PRODUCT VS = ± 2.5V AV = –1 RF = RG = 10k f = 5kHz 10k LOAD RESISTANCE (Ω) 100k 1784 G16 Output Impedance vs Frequency 1k VS = ± 2.5V 1M OUTPUT IMPEDANCE (Ω) OUTPUT STEP (V) AV = 100 10 AV = 10 1 AV = 1 0.1 OUTPUT IMPEDANCE (Ω) 100 0.01 100 1k 10k 100k FREQUENCY (Hz) UW 100 1784 G13 1784 G19 Slew Rate vs Temperature 3.0 VS = ± 5V Gain Bandwidth Product and Phase Margin vs Supply Voltage AV = –1 RF = RG = 10k f = 5kHz 65 PHASE MARGIN 60 PHASE MARGIN (DEG) 2.5 FALLING 55 2.7 2.6 2.5 2.4 0 2 6 4 8 10 12 14 16 TOTAL SUPPLY VOLTAGE (V) 18 GAIN BANDWIDTH PRODUCT 2.0 125 1.5 –50 –25 50 25 75 0 TEMPERATURE (°C) 100 125 1784 G14 1784 G15 PSRR vs Frequency 60 PHASE MARGIN (DEG) 80 70 60 50 40 30 20 10 0 –10 1k 10k 100k FREQUENCY (Hz) 1M 1784 G17 CMRR vs Frequency 120 110 100 90 80 70 60 50 40 30 20 10k 100k FREQUENCY (Hz) 1M 1784 G18 VS = ± 2.5V VS = ± 2.5V 55 POSITIVE SUPPLY NEGATIVE SUPPLY Disabled Output Impedance vs Frequency VS = ± 2.5V VPIN 5 = 2.5V Settling Time to 0.1% vs Output Step 5 4 3 2 1 0 –1 –2 –3 –4 AV = 1 AV = – 1 VS = ± 5V AV = 1 AV = – 1 100k 10k 1k 1M 100 100 –5 1k 10k 100k FREQUENCY (Hz) 1M 1784 G20 0 1 2 4 6 5 3 SETTLING TIME (µs) 7 8 1784 G21 7 LT1784 TYPICAL PERFOR A CE CHARACTERISTICS Capacitive Load Handling Overshoot vs Capacitive Load 70 60 50 VS = 5V, 0V VCM = 2.5V OUTPUT SWING (VP-P) OVERSHOOT (%) 40 30 20 10 0 10 100 CAPACITIVE LOAD (pF) AV = 5 6 4 2 0 VS = ± 2.5V THD + NOISE (%) Total Harmonic Distortion + Noise vs Load Resistance 1 VS = ± 1.5V VIN = ± 1V 0.1 AV = 1 VS = 3V TOTAL VIN = 2VP-P AT 1kHz THD + NOISE (%) 10 FREQUENCY = 1kHz VCM = HALF SUPPLY INPUT OFFSET VOLTAGE CHANGE (50µV/DIV) THD + NOISE (%) 0.01 VS = 3V, 0V VIN = 0.1V TO 2.1V 0.001 0.0001 100 1k 10k LOAD RESISTANCE TO GROUND (Ω) 1784 G25 Supply Current vs SHDN Pin Voltage 600 550 500 TA = 125°C TA = 25°C TA = – 55°C VS = 5V, 0V SUPPLY CURRENT (µA) 450 400 350 300 250 200 150 100 50 0 0 2 0.5 1.5 1 SHUTDOWN PIN VOLTAGE (V) 8 UW AV = 1 AV = 10 1784 G28 Undistorted Output Swing vs Frequency 12 10 8 VS = ± 5V DISTORTION ≤ 1% AV = 1 Total Harmonic Distortion + Noise vs Frequency 0.1 RL = 10k VS = 3V, 0V VOUT = 1.8VP-P VCM = 1V 0.01 AV = –1 0.001 AV = 1 1000 1784 G22 1k 10k 100k FREQUENCY (Hz) 1M 1784 G23 0.0001 10 100 1k 10k FREQUENCY (Hz) 100k 1784 G24 Total Harmonic Distortion + Noise vs Output Voltage Amplitude Open-Loop Gain VS = ± 5V RL = 2k 1 AV = 1 VS = 3V, 0V 0.1 AV = –1 VS = 3V, 0V RF = RG = 10k RL = 10k RL = 50k AV = 1 VS = ±1.5V AV = –1 VS = ±1.5V RF = RG = 10k 0.01 0.001 100k 0 1 2 OUTPUT VOLTAGE AMPLITUDE (VP-P) 3 –6 –5 –4 –3 –2 –1 0 1 2 3 OUTPUT VOLTAGE (V) 4 5 6 1784 G26 1784 G27 Large Signal Response Small Signal Response 2V/DIV 20mV/DIV VS = ± 5V AV = 1 CL = 15pF 2.5 5µs/DIV VS = ± 5V AV = 1 CL = 15pF 2µs/DIV LT1784 APPLICATIO S I FOR ATIO Supply Voltage The positive supply pin of the LT1784 should be bypassed with a small capacitor (typically 0.1µF) within an inch of the pin. When driving heavy loads, and additional 4.7µF electrolytic capacitor should be used. When using split supplies the same is true for the negative supply pin. The LT1784 is protected against reverse battery voltages up to 18V. In the event a reverse battery condition occurs the supply current is less than 1nA. Inputs The LT1784 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 Characteristic Curve. For input voltages about 1V or more below V +, the PNP input stage is active and the input bias current is typically –250nA. When the input common mode voltage is within 0.6V of the positive rail, the NPN stage is operating and the input bias current is typically 500nA. 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 3mV. A Schottky diode in the collector of the input transistors, along with special geometries for these NPN transistors, allow the LT1784 to operate with either or both of its inputs above V +. At about 0.3V above V +, the NPN input transistors is fully saturated and the input bias current is typically 200µA at room temperature. The input offset voltage is typically 3mV when operating above V +. The LT1784 will operate with 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 LT1784 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. U Output The output of the LT1784 can swing to within 80mV of the positive rail and within 4mV of the negative rail with no load. When monitoring input voltages within 80mV of the positive rail or within 4mV of the negative rail, gain should be taken to keep the output from clipping. The LT1784 can typically sink and source over 25mA at ±5V supplies, sourcing current is reduced to 7.5mA at 3V total supplies as noted in the electrical characteristics. The LT1784 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 not within 1V of V +), the CMRR is very good, typically 95dB. When the LT1784 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 LT1784 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V + – 1V). See Typical Performance Characteristics Curve, “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 Characteric Curve “Open-Loop Gain” for various loads shows the details. W UU 9 LT1784 APPLICATIO S I FOR ATIO 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 TYPICAL APPLICATIO S Adjustable Clamp Negative Rectifier V+ LT1784 OUT - ~80mV VIN – V– 10k WORKS WELL TO 100kHz + LT1784 VOUT 10k V– V– VCLAMP - ~80mV WORKS WELL TO 100kHz – SI PLIFIED SCHE ATIC Q1 D1 SHDN R1 6k Q4 – IN R6 1.5k J1 R2 1k Q2 Q3 Q22 D3 R7 1.5k Q12 Q16 Q17 Q20 OUT Q18 + 20µA +IN R3 1k Q7 R8 0.75k Q8 R9 0.75k Q10 Q11 Q15 Q13 Q14 Q21 Q26 Q9 Q25 Q23 Q24 Q5 Q6 D4 D5 R4 2k R5 2k V– 1784 SS 10 + VIN + LT1784 VCLAMP – U bringing the SHDN pin 1.2V or more above V –. When shut down, the supply current is less than 1µA (V – ≤ VOUT ≤ V +). In normal operation, the SHDN pin can be tied to V – or left floating. See Typical Performance Characteristics Curve, “Supply Current vs SHDN pin Voltage.” 1784 TA07 W U W UU W V+ Q19 LT1784 PACKAGE DESCRIPTIO A A1 A2 L SOT-23 (Original) .90 – 1.45 (.035 – .057) .00 – .15 (.00 – .006) .90 – 1.30 (.035 – .051) .35 – .55 (.014 – .021) SOT-23 (ThinSOT) 1.00 MAX (.039 MAX) .01 – .10 (.0004 – .004) .80 – .90 (.031 – .035) .30 – .50 REF (.012 – .019 REF) 2.60 – 3.00 (.102 – .118) .20 (.008) DATUM ‘A’ A A2 L .09 – .20 (.004 – .008) (NOTE 2) SOT-23 (Original) A A1 A2 L .90 – 1.45 (.035 – .057) .00 – 0.15 (.00 – .006) .90 – 1.30 (.035 – .051) .35 – .55 (.014 – .021) SOT-23 (ThinSOT) 1.00 MAX (.039 MAX) .01 – .10 (.0004 – .004) .80 – .90 (.031 – .035) .30 – .50 REF (.012 – .019 REF) 2.60 – 3.00 (.102 – .118) 1.50 – 1.75 (.059 – .069) (NOTE 3) PIN ONE ID .20 (.008) DATUM ‘A’ A A2 L .09 – .20 (.004 – .008) (NOTE 2) 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 S5 Package 5-Lead Plastic SOT-23 (Reference LTC DWG # 05-08-1633) (Reference LTC DWG # 05-08-1635) 2.80 – 3.10 (.110 – .118) (NOTE 3) 1.50 – 1.75 (.059 – .069) (NOTE 3) PIN ONE .95 (.037) REF .25 – .50 (.010 – .020) (5PLCS, NOTE 2) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) 3. DRAWING NOT TO SCALE 4. DIMENSIONS ARE INCLUSIVE OF PLATING 5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 6. MOLD FLASH SHALL NOT EXCEED .254mm 7. PACKAGE EIAJ REFERENCE IS: SC-74A (EIAJ) FOR ORIGINAL JEDEC MO-193 FOR THIN 1.90 (.074) REF A1 S5 SOT-23 0401 S6 Package 6-Lead Plastic SOT-23 (Reference LTC DWG # 05-08-1634) (Reference LTC DWG # 05-08-1636) 2.80 – 3.10 (.110 – .118) (NOTE 3) .95 (.037) REF .25 – .50 (.010 – .020) (6PLCS, NOTE 2) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) 3. DRAWING NOT TO SCALE 4. DIMENSIONS ARE INCLUSIVE OF PLATING 5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 6. MOLD FLASH SHALL NOT EXCEED .254mm 7. PACKAGE EIAJ REFERENCE IS: SC-74A (EIAJ) FOR ORIGINAL JEDEC MO-193 FOR THIN 1.90 (.074) REF A1 S6 SOT-23 0401 11 LT1784 TYPICAL APPLICATIO S Protected Fault Conditions –18V 5V 5V 5V + – V+ LT1784 REVERSE BATTERY INPUT OVERVOLTAGE INPUT DIFFERENTIAL VOLTAGE INPUTS BELOW GROUND Simple Peak Detector 5V VIN Single Supply Full Wave Rectifier 1k OUT + LT1784 – BAT54 ACCURACY 98% 90% 3dB BANDWIDTH 3kHz TO 5.7kHz 116Hz TO 47kHz 34Hz TO 96kHz 5V 1k 1k IN – LT1784 VOUT 1µF VIN = 3VP-P, VCM = 2.5V 100k 1784 TA04 + WORKS WELL TO 15kHz 1785 TA05 Simple Polarity Selector 1k V+ 1k IN IN 1V/DIV OUT 1V/DIV 0V V– 1785 TA06a – LT1784 + V– SHDN OUT FOLLOW INVERT SHDN 5V/DIV 100µs/DIV VS = ± 5V VIN = 3VP-P AT 5kHz 1785 TA06b RELATED PARTS PART NUMBER LT1782 LT1783 LT1797 LT1637 LT1638/LT1639 LT1880 DESCRIPTION Micropower Over-The-Top Rail-to-Rail In/Out Op Amp in SOT-23 1.25MHz Over-The-Top Rail-to-Rail In/Out Op Amp in SOT-23 10MHz Rail-to-Rail In/Out Op Amp in SOT-23 1.1MHz Over-The-Top Rail-to-Rail In/Out Op Amp Dual/Quad 1.2MHz Over-The-Top Rail-to-Rail In/Out Op Amp SOT-23 Pico Amp Input, Precision, Rail-to-Rail Output Op Amp COMMENTS 55µA Max Supply Current, 800µV Max Offset Voltage 300µA Max Supply Current, 800µV Max Offset Voltage Unity-Gain Stable, 2.25µV/µs Slew Rate Micropower, 0.4V/µs Slew Rate Micropower 230µA Max, 0.4V/µs Slew Rate 150µV Offset, 900pA Bias Current 1784f LT/TP 0601 2K • PRINTED IN USA 12 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 q FAX: (408) 434-0507 q www.linear.com © LINEAR TECHNOLOGY CORPORATION 2000 + 24V U + + – V+ LT1784 18V + + LT1784 + LT1784 – 10V – 1784 TA02 BAT54