LTC2050/LTC2050HV Zero-Drift Operational Amplifiers in SOT-23 DESCRIPTION FEATURES n n n n n n n n n n n n n Maximum Offset Voltage of 3μV Maximum Offset Voltage Drift of 30nV/°C Noise: 1.5μVP-P (0.01Hz to 10Hz Typ) Voltage Gain: 140dB (Typ) PSRR: 130dB (Typ) CMRR: 130dB (Typ) Supply Current: 0.8mA (Typ) Supply Operation: 2.7V to 6V (LTC2050) 2.7V to ±5.5V (LTC2050HV) Extended Common Mode Input Range Output Swings Rail-to-Rail Input Overload Recovery Time: 2ms (Typ) Operating Temperature Range: –40°C to 125°C SOT-23 Package The LTC®2050 and LTC2050HV are zero-drift operational amplifiers available in the 5- or 6-lead SOT-23 and SO-8 packages. The LTC2050 operates from a single 2.7V to 6V supply. The LTC2050HV operates on supplies from 2.7V to ±5.5V. The current consumption is 800μA and the versions in the 6-lead SOT-23 and SO-8 packages offer power shutdown (active low). The LTC2050, despite its miniature size, features uncompromising DC performance. The typical input offset voltage and offset drift are 0.5μV and 10nV/°C. The almost zero DC offset and drift are supported with a power supply rejection ratio (PSRR) and common mode rejection ratio (CMRR) of more than 130dB. The input common mode voltage ranges from the negative supply up to typically 1V from the positive supply. The LTC2050 also has an enhanced output stage capable of driving loads as low as 2kΩ to both supply rails. The open-loop gain is typically 140dB. The LTC2050 also features a 1.5μVP-P DC to 10Hz noise and a 3MHz gain bandwidth product. APPLICATIONS n n n n n n n Thermocouple Amplifiers Electronic Scales Medical Instrumentation Strain Gauge Amplifiers High Resolution Data Acquisition DC Accurate RC Active Filters Low Side Current Sense L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION Differential Bridge Amplifier Input Referred Noise 0.1Hz to 10Hz 2 5V 5V 50Ω GAIN TRIM 0.1μF 0.1μF 1 μV 18.2k 350Ω STRAIN GAUGE 4 – LTC2050HV 3 0.1μF + 0 5 1 AV = 100 –1 2 18.2k –2 0 2050 TA01 2 4 6 TIME (SEC) 8 10 –5V 2050fb 1 LTC2050/LTC2050HV ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V+ to V–) LTC2050..................................................................7V LTC2050HV ...........................................................12V Input Voltage ......................... (V+ + 0.3V) to (V– – 0.3V) Output Short-Circuit Duration ......................... Indefinite Operating Temperature Range................ –40°C to 125°C Specified Temperature Range (Note 3) ............................................. –40°C to 125°C Storage Temperature Range................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300°C PIN CONFIGURATION TOP VIEW TOP VIEW TOP VIEW OUT 1 5 V+ OUT 1 V– 2 V– 2 +IN 3 +IN 3 4 –IN 6 V+ 5 SHDN 4 –IN S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 125°C, θJA = 230°C/W S5 PACKAGE 5-LEAD PLASTIC TSOT-23 TJMAX = 125°C, θJA = 250°C/W SHDN 1 8 NC –IN 2 7 V+ +IN 3 6 OUT V– 4 5 NC S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125°C, θJA = 190°C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC2050CS5#PBF LTC2050CS5#TRPBF LTAEG 5-Lead Plastic TSOT-23 0°C to 70°C LTC2050IS5#PBF LTC2050IS5#TRPBF LTAEG 5-Lead Plastic TSOT-23 –40°C to 85°C LTC2050HS5#PBF LTC2050HS5#TRPBF LTAEG 5-Lead Plastic TSOT-23 –40°C to 125°C LTC2050HVCS5#PBF LTC2050HVCS5#TRPBF LTAEH 5-Lead Plastic TSOT-23 0°C to 70°C LTC2050HVIS5#PBF LTC2050HVIS5#TRPBF LTAEH 5-Lead Plastic TSOT-23 –40°C to 85°C LTC2050HVHS5#PBF LTC2050HVHS5#TRPBF LTAEH 5-Lead Plastic TSOT-23 –40°C to 125°C LTC2050CS6#PBF LTC2050CS6#TRPBF LTAEJ 6-Lead Plastic TSOT-23 0°C to 70°C LTC2050IS6#PBF LTC2050IS6#TRPBF LTAEJ 6-Lead Plastic TSOT-23 –40°C to 85°C LTC2050HS6#PBF LTC2050HS6#TRPBF LTAEJ 6-Lead Plastic TSOT-23 –40°C to 125°C LTC2050HVCS6#PBF LTC2050HVCS6#TRPBF LTAEK 6-Lead Plastic TSOT-23 0°C to 70°C LTC2050HVIS6#PBF LTC2050HVIS6#TRPBF LTAEK 6-Lead Plastic TSOT-23 –40°C to 85°C LTC2050HVHS6#PBF LTC2050HVHS6#TRPBF LTAEK 6-Lead Plastic TSOT-23 –40°C to 125°C LTC2050CS8#PBF LTC2050CS8#TRPBF 2050 8-Lead Plastic SO 0°C to 70°C LTC2050IS8#PBF LTC2050IS8#TRPBF 2050I 8-Lead Plastic SO –40°C to 85°C LTC2050HVCS8#PBF LTC2050HVCS8#TRPBF 2050HV 8-Lead Plastic SO 0°C to 70°C LTC2050HVIS8#PBF LTC2050HVIS8#TRPBF 050HVI 8-Lead Plastic SO –40°C to 85°C 2050fb 2 LTC2050/LTC2050HV ORDER INFORMATION LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC2050CS5 LTC2050CS5#TR LTAEG 5-Lead Plastic TSOT-23 0°C to 70°C LTC2050IS5 LTC2050IS5#TR LTAEG 5-Lead Plastic TSOT-23 –40°C to 85°C LTC2050HS5 LTC2050HS5#TR LTAEG 5-Lead Plastic TSOT-23 –40°C to 125°C LTC2050HVCS5 LTC2050HVCS5#TR LTAEH 5-Lead Plastic TSOT-23 0°C to 70°C LTC2050HVIS5 LTC2050HVIS5#TR LTAEH 5-Lead Plastic TSOT-23 –40°C to 85°C LTC2050HVHS5 LTC2050HVHS5#TR LTAEH 5-Lead Plastic TSOT-23 –40°C to 125°C LTC2050CS6 LTC2050CS6#TR LTAEJ 6-Lead Plastic TSOT-23 0°C to 70°C LTC2050IS6 LTC2050IS6#TR LTAEJ 6-Lead Plastic TSOT-23 –40°C to 85°C LTC2050HS6 LTC2050HS6#TR LTAEJ 6-Lead Plastic TSOT-23 –40°C to 125°C LTC2050HVCS6 LTC2050HVCS6#TR LTAEK 6-Lead Plastic TSOT-23 0°C to 70°C LTC2050HVIS6 LTC2050HVIS6#TR LTAEK 6-Lead Plastic TSOT-23 –40°C to 85°C LTC2050HVHS6 LTC2050HVHS6#TR LTAEK 6-Lead Plastic TSOT-23 –40°C to 125°C LTC2050CS8 LTC2050CS8#TR 2050 8-Lead Plastic SO 0°C to 70°C LTC2050IS8 LTC2050IS8#TR 2050I 8-Lead Plastic SO –40°C to 85°C LTC2050HVCS8 LTC2050HVCS8#TR 2050HV 8-Lead Plastic SO 0°C to 70°C LTC2050HVIS8 LTC2050HVIS8#TR 050HVI 8-Lead Plastic SO –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 2050fb 3 LTC2050/LTC2050HV ELECTRICAL CHARACTERISTICS (LTC2050, LTC2050HV) The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 3V unless otherwise noted. (Note 3) C, I SUFFIXES PARAMETER CONDITIONS Input Offset Voltage (Note 2) Average Input Offset Drift (Note 2) MIN ±0.5 l LTC2050 LTC2050 LTC2050HV Input Noise Voltage l l Common Mode Rejection Ratio Power Supply Rejection Ratio VS = 2.7V to 6V Large-Signal Voltage Gain RL = 10k Output Voltage Swing High Output Voltage Swing Low ±3 ±0.05 50 UNITS μV μV/°C nV/√mo ±20 ±75 ±300 ±20 ±75 ±4000 pA pA ±1 ±50 ±100 ±1 ±50 ±4000 pA pA ±150 ±1000 pA pA l ±100 ±150 ±100 ±1000 pA pA 1.5 1.5 μVP-P 1.7 1.7 pF l 115 110 130 130 115 110 130 130 dB dB l 120 115 130 130 120 115 130 130 dB dB l 120 115 140 140 120 115 140 140 dB dB RL = 2k to GND RL = 10k to GND l l 2.85 2.95 2.94 2.98 2.85 2.95 2.94 2.98 V V RL = 2k to GND RL = 10k to GND l l 1 1 Slew Rate 10 10 1 1 2 Gain Bandwidth Product l l 0.75 l Shutdown Pin Input High Voltage (VIH) VSHDN = GND l 0.75 V+ – 0.5 MHz 1.2 10 V– + 0.5 V+ – 0.5 –0.5 7.5 –3 mV mV V/μs 3 1.1 10 V– + 0.5 l 10 10 2 3 VSHDN = VIH, No Load VSHDN = VIL Shutdown Pin Input Low Voltage (VIL) Internal Sampling Frequency ±0.5 MAX ±150 ±200 RS = 100Ω, 0.01Hz to 10Hz VCM = GND to (V+ – 1.3) VCM = GND to (V+ – 1.3) Shutdown Pin Input Current ±3 TYP l Input Capacitance Supply Current MIN 50 LTC2050HV Input Offset Current MAX ±0.03 Long-Term Offset Drift Input Bias Current TYP H SUFFIX mA μA V V –0.5 7.5 –3 μA kHz 2050fb 4 LTC2050/LTC2050HV ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (LTC2050, LTC2050HV) VS = 5V unless otherwise noted. (Note 3) C, I SUFFIXES PARAMETER CONDITIONS Input Offset Voltage (Note 2) Average Input Offset Drift (Note 2) MIN ±0.5 ±3 MIN LTC2050 LTC2050HV Input Noise Voltage RS = 100Ω, 0.01Hz to 10Hz Common Mode Rejection Ratio VCM = GND to (V+ – 1.3) VCM = GND to (V+ – 1.3) Power Supply Rejection Ratio VS = 2.7V to 6V Large-Signal Voltage Gain RL = 10k Output Voltage Swing High Output Voltage Swing Low TYP MAX ±0.5 ±3 ±0.03 ±0.05 50 LTC2050 LTC2050HV Input Offset Current MAX l Long-Term Offset Drift Input Bias Current H SUFFIX TYP l l 50 UNITS μV μV/°C nV/√mo ±75 ±150 ±300 ±75 ±150 ±4000 pA pA ±7 ±50 ±150 ±7 ±50 ±4000 pA pA l ±300 ±400 ±300 ±1000 pA pA l ±100 ±200 ±100 ±1000 pA pA 1.5 1.5 μVP-P l 120 115 130 130 120 110 130 130 dB dB l 120 115 130 130 120 115 130 130 dB dB l 125 120 140 140 125 115 140 140 dB dB RL = 2k to GND RL = 10k to GND l l 4.85 4.95 4.94 4.98 4.85 4.95 4.94 4.98 V V RL = 2k to GND RL = 10k to GND l l 1 1 10 10 1 1 10 10 mV mV Slew Rate 2 2 V/μs Gain Bandwidth Product 3 3 MHz Supply Current VSHDN = VIH, No Load VSHDN = VIL l Shutdown Pin Input High Voltage (VIH) Internal Sampling Frequency 0.8 VSHDN = GND l 1.2 15 0.8 V– + 0.5 l Shutdown Pin Input Low Voltage (VIL) Shutdown Pin Input Current l l V+ – 0.5 1.3 15 V– + 0.5 V –7 μA V+ – 0.5 –0.5 7.5 –7 mA μA V –0.5 7.5 kHz 2050fb 5 LTC2050/LTC2050HV ELECTRICAL CHARACTERISTICS (LTC2050HV) The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±5V unless otherwise noted. (Note 3) C, I SUFFIXES PARAMETER CONDITIONS Input Offset Voltage (Note 2) Average Input Offset Drift (Note 2) MIN MAX ±0.5 ±3 l 50 Input Bias Current (Note 4) ±25 l RS = 100Ω, 0.01Hz to 10Hz Common Mode Rejection Ratio VCM = V– to (V+ – 1.3) VCM = V– to (V+ – 1.3) Power Supply Rejection Ratio VS = 2.7V to 11V Large-Signal Voltage Gain RL = 10k Maximum Output Voltage Swing RL = 2k to GND RL = 10k to GND 50 ±125 ±300 ±25 1.5 μV/°C nV/√mo ±125 ±4000 pA pA ±250 ±1000 pA pA 1.5 μVP-P l 130 130 dB dB l 120 115 130 130 120 115 130 130 dB dB 125 120 140 140 125 120 140 140 dB dB ±4.75 ±4.90 ±4.94 ±4.98 ±4.50 ±4.85 ±4.94 ±4.98 V V l l 2 3 l l l Shutdown Pin Input High Voltage (VIH) l VSHDN μV 120 115 Shutdown Pin Input Low Voltage (VIL) Shutdown Pin Input Current ±3 UNITS 130 130 Gain Bandwidth Product = V– ±0.5 ±0.05 2 VSHDN = VIH, No Load VSHDN = VIL MAX 120 115 Slew Rate Supply Current TYP ±250 ±500 l Input Noise Voltage MIN ±0.03 Long-Term Offset Drift Input Offset Current (Note 4) H SUFFIX TYP l Internal Sampling Frequency 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: These parameters are guaranteed by design. Thermocouple effects preclude measurements of these voltage levels during automated testing. Note 3: All versions of the LTC2050 are designed, characterized and expected to meet the extended temperature limits of – 40°C and 125°C. 1 V/μs 3 1.5 25 1 V– + 0.5 V+ – 0.5 MHz 1.6 25 V– + 0.5 V+ – 0.5 –3 7.5 –20 mA μA V V –3 7.5 –20 μA kHz The LTC2050C/LTC2050HVC are guaranteed to meet the temperature limits of 0°C and 70°C. The LTC2050I/LTC2050HVI are guaranteed to meet the temperature limits of –40°C and 85°C. The LTC2050H/LTC2050HVH are guaranteed to meet the temperature limits of –40°C and 125°C. Note 4: The bias current measurement accuracy depends on the proximity of the supply bypass capacitor to the device under test, especially at ±5V supplies. Because of testing limitations on the placement of this bypass capacitor, the bias current at ±5V supplies is guaranteed by design to meet the data sheet limits, but tested to relaxed limits. 2050fb 6 LTC2050/LTC2050HV TYPICAL PERFORMANCE CHARACTERISTICS Common Mode Rejection Ratio vs Frequency DC CMRR vs Common Mode Input Voltage 140 VS = 3V OR 5V VCM = 0.5VP-P 120 120 120 100 60 80 60 40 20 20 0 0 10k 100 1k FREQUENCY (Hz) 100k TA = 25°C 2 1 3 0 5 4 VCM (V) 10 100 2050 G02 5 RL TO GND 4 5 2 3 VS = 5V OUTPUT SWING (V) OUTPUT VOLTAGE (V) VS = 3V 4 3 VS = 3V 2 1 1 0 0 0.01 1M 100k Output Swing vs Load Resistance ±5V Supply 6 4 1k 10k FREQUENCY (Hz) 2050 G14 Output Swing vs Output Current VS = 5V 3 20 2050 G01 RL TO GND 5 +PSRR 60 40 0 Output Voltage Swing vs Load Resistance 6 VS = 5V VS = 3V 40 10 80 PSRR (dB) 80 1 OUTPUT SWING (V) –PSRR 100 CMRR (dB) CMRR (dB) 100 PSRR vs Frequency 140 2 1 0 –1 –2 –3 –4 2 10 8 6 4 LOAD RESISTANCE (kΩ) –5 0.1 1 OUTPUT CURRENT (mA) Output Swing vs Output Current ±5V Supply 10 10k RL TO GND 80 100 PHASE 1k 60 2 GAIN (dB) 1 0 –1 –2 120 40 GAIN 140 20 160 0 –3 –20 –4 0.1 1.0 OUTPUT CURRENT (mA) 10 2050 G17 PHASE (DEG) OUTPUT SWING (V) 6 8 4 LOAD RESISTANCE (kΩ) Bias Current vs Temperature 80 100 3 –5 0.01 2 2050 G16 Gain/Phase vs Frequency 5 0 2050 G04 2050 G03 4 10 BIAS CURRENT (pA) 0 VS = 5V 100 VS = 3V 10 VS = 3V OR 5V CL = 35pF RL = 10kΩ –40 100 1k 100k 10k FREQUENCY (Hz) 180 1M 200 10M 2050 G05 1 –50 –25 75 50 0 25 TEMPERATURE (°C) 100 125 2050 G06 2050fb 7 LTC2050/LTC2050HV TYPICAL PERFORMANCE CHARACTERISTICS Input Bias Current vs Input Common Mode Voltage (LTC2050HV) 160 60 140 50 INPUT BIAS CURRENT (pA) INPUT BIAS CURRENT MAGNITUDE (pA) Input Bias Current vs Input Common Mode Voltage 120 VS = 5V 100 80 60 VS = 3V 40 VS = ±5V 0.5/DIV 30 20 VS = 5V 10 VS = 3V 0 20 0 40 Transient Response AV = 1 RL = 100k CL = 50pF VS = 5V –10 0 1 2 4 3 INPUT COMMON MODE VOLTAGE (V) 5 –5 –1 1 3 –3 INPUT COMMON MODE VOLTAGE (V) 5 1μs/DIV 2050 G07 2050 G15 2050 G13 Sampling Frequency vs Supply Voltage Input Overload Recovery Sampling Frequency vs Temperature 10 10 TA = 25°C 0 0 INPUT (V) –0.2 AV = –100 RL = 100k CL = 10pF VS = ±1.5V 500μs/DIV 2050 G08 SAMPLING FREQUENCY (kHz) OUTPUT (V) SAMPLING FREQUENCY (kHz) 1.5 9 8 7 6 5 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) 5.5 6.0 9 8 VS = 5V 7 6 5 –50 –25 50 25 0 75 TEMPERATURE (°C) 2050 G09 Supply Current vs Supply Voltage 2050 G10 Supply Current vs Temperature TA = 25°C VS = 5V 1.0 0.8 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 125 1.0 1.2 0.8 0.6 0.4 VS = 3V 0.6 0.4 0.2 0.2 0 100 2 4 8 6 SUPPLY VOLTAGE (V) 10 2050 G11 0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 2050 G12 2050fb 8 LTC2050/LTC2050HV TEST CIRCUITS Electrical Characteristics Test Circuit 100k OUTPUT V+ 10Ω 4 5 – LTC2050 3 + 1 2 RL V– 2050 TC01 DC-10Hz Noise Test Circuit 100k 10Ω 4 – 0.01μF LTC2050 3 475k + 1 158k 316k 475k – 0.1μF 0.01μF LT1012 TO X-Y RECORDER + FOR 1Hz NOISE BW INCREASE ALL THE CAPACITORS BY A FACTOR OF 10. 2050 TC02 2050fb 9 LTC2050/LTC2050HV APPLICATIONS INFORMATION Shutdown The LTC2050 includes a shutdown pin in the 6-lead SOT-23 and the SO-8 version. When this active low pin is high or allowed to float, the device operates normally. When the shutdown pin is pulled low, the device enters shutdown mode; supply current drops to 3μA, all clocking stops, and both inputs and output assume a high impedance state. Clock Feedthrough, Input Bias Current The LTC2050 uses auto-zeroing circuitry to achieve an almost zero DC offset over temperature, common mode voltage, and power supply voltage. The frequency of the clock used for auto-zeroing is typically 7.5kHz. The term clock feedthrough is broadly used to indicate visibility of this clock frequency in the op amp output spectrum. There are typically two types of clock feedthrough in auto zeroed op amps like the LTC2050. The first form of clock feedthrough is caused by the settling of the internal sampling capacitor and is input referred; that is, it is multiplied by the closed loop gain of the op amp. This form of clock feedthrough is independent of the magnitude of the input source resistance or the magnitude of the gain setting resistors. The LTC2050 has a residue clock feedthrough of less then 1μVRMS input referred at 7.5kHz. The second form of clock feedthrough is caused by the small amount of charge injection occurring during the sampling and holding of the op amp’s input offset voltage. The current spikes are multiplied by the impedance seen at the input terminals of the op amp, appearing at the output multiplied by the closed loop gain of the op amp. To reduce this form of clock feedthrough, use smaller valued gain setting resistors and minimize the source resistance at the input. If the resistance seen at the inputs is less than 10k, this form of clock feedthrough is less than 1μVRMS input referred at 7.5kHz, or less than the amount of residue clock feedthrough from the first form described above. Placing a capacitor across the feedback resistor reduces either form of clock feedthrough by limiting the bandwidth of the closed loop gain. Input bias current is defined as the DC current into the input pins of the op amp. The same current spikes that cause the second form of clock feedthrough described above, when averaged, dominate the DC input bias current of the op amp below 70°C. At temperatures above 70°C, the leakage of the ESD protection diodes on the inputs increases the input bias currents of both inputs in the positive direction, while the current caused by the charge injection stays relatively constant. At elevated temperatures (above 85°C) the leakage current begins to dominate and both the negative and positive pin’s input bias currents are in the positive direction (into the pins). Input Pins, ESD Sensitivity ESD voltages above 700V on the input pins of the op amp will cause the input bias currents to increase (more DC current into the pins). At these voltages, it is possible to damage the device to a point where the input bias current exceeds the maximums specified in this data sheet. 2050fb 10 LTC2050/LTC2050HV TYPICAL APPLICATIONS Single Supply Thermocouple Amplifier 1k 1% 255k 1% 100Ω 0.068μF 5V 5V 2 4 LT1025A K GND R– 5 4 3 7 – + 5 – 1 LTC2050 + VOUT 10mV/°C 2 0.1μF TYPE K LT1025 COMPENSATES COLD JUNCTION OVER 0°C TO 100°C TEMPERATURE RANGE 2050 TA03 Gain of 1001 Single Supply Instrumentation Amplifier 0.1μF 10Ω 10k V+ 10k 4 – LTC2050 –VIN 3 + V+ 5 1 10Ω – 5 LTC2050 2 +VIN OUTPUT DC OFFSET ≤ 6mV FOR 0.1% RESISTORS, CMRR = 54dB 4 3 + 1 VOUT 2 2050 TA04 2050fb 11 LTC2050/LTC2050HV TYPICAL APPLICATIONS Instrumentation Amplifier with 100V Common Mode Input Voltage 1k 1M V+ 1M 4 + VIN – LTC2050HV 1M 3 – 1k + V+ 5 2 V– 1 1k 4 – 5 LTC2050HV 3 + 1 VOUT 2 V– OUTPUT OFFSET ≤3mV FOR 0.1% RESISTORS, CMRR = 54dB High Precision Three-Input Mux 1.1k 2050 TA06 Low-Side Power Supply Current Sensing 10k 5V SHDN 4 – LTC2050 IN 1 3 AV = 10 – OUT SHDN 5 SEL2 1 – 2 TO MEASURED CIRCUIT OUT 3V/AMP LOAD CURRENT IN MEASURED CIRCUIT, REFERRED TO –5V 10k 3mΩ 0.1μF LOAD CURRENT –5V 2050 TA08 1 + – SEL3 5 LTC2050 IN 3 3 AV = 1 4 10k SHDN 4 5 10Ω LTC2050 IN 2 3 AV = 1000 + LTC2050HV 1 + 10Ω 4 3 SEL1 5 1 + 2050 TA07 SELECT INPUTS ARE CMOS LOGIC COMPATIBLE 2050fb 12 LTC2050/LTC2050HV PACKAGE DESCRIPTION S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635) 0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 1.90 BSC S5 TSOT-23 0302 REV B 2050fb 13 LTC2050/LTC2050HV PACKAGE DESCRIPTION S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 0.62 MAX 2.90 BSC (NOTE 4) 0.95 REF 1.22 REF 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 6 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) 1.90 BSC S6 TSOT-23 0302 REV B NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 2050fb 14 LTC2050/LTC2050HV PACKAGE DESCRIPTION S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC 8 .245 MIN 7 6 5 .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 3 4 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN 2 .014 – .019 (0.355 – 0.483) TYP 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) .050 (1.270) BSC SO8 0303 2050fb 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. 15 LTC2050/LTC2050HV TYPICAL APPLICATION Ground Referred Precision Current Sources LT1034 0 ≤ IOUT ≤ 4mA (V–) + 1.5V ≤ VOUT ≤ – 1V + VOUT – 1.235V IOUT = ——— RSET V+ 10k 4 5 – LTC2050 3 + 1 3 2 RSET 10k 1.235V IOUT = ——— RSET + LTC2050 4 RSET 5 + – 1 2 V– VOUT – 0 ≤ IOUT ≤ 4mA 0.2V ≤ VOUT ≤ (V+) – 1.5V LT1034 2050 TA05 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1049 Low Power Zero-Drift Op Amp Low Supply Current 200μA LTC1050 Precision Zero-Drift Op Amp Single Supply Operation 4.75V to 16V, Noise Tested and Guaranteed LTC1051/LTC1053 Precision Zero-Drift Op Amp Dual/Quad LTC1150 ±15V Zero-Drift Op Amp High Voltage Operation ±18V LTC1152 Rail-to-Rail Input and Output Zero-Drift Op Amp Single Zero-Drift Op Amp with Rail-to-Rail Input and Output and Shutdown LT1677 Low Noise Rail-to-Rail Input and Output Precision Op Amp VOS = 90μV, VS = 2.7V to 44V LT1884/LT1885 Rail-to-Rail Output Precision Op Amp VOS = 50μV, IB = 400pA, VS = 2.7V to 40V LTC2051 Dual Zero-Drift Op Amp Dual Version of the LTC2050 in MS8 Package 2050fb 16 Linear Technology Corporation LT 0208 REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 1999