LTC1050AMH

LTC1050 Precision Zero-Drift Operational Amplifier with Internal Capacitors DESCRIPTIO The LTC®1050 is a high performance, low cost zero-drift operational amplifier. The unique achievement of the LTC1050 is that it integrates on-chip the two sample-andhold capacitors usually required externally by other chopper amplifiers. Further, the LTC1050 offers better combined overall DC and AC performance than is available from other chopper stabilized amplifiers with or without internal sample-and-hold capacitors. The LTC1050 has an offset voltage of 0.5µV, drift of 0.01µV/°C, DC to 10Hz, input noise voltage of 1.6µVP-P and a typical voltage gain of 160dB. The slew rate of 4V/µs and a gain bandwidth product of 2.5MHz are achieved with only 1mA of supply current. Overload recovery times from positive and negative saturation conditions are 1.5ms and 3ms respectively, which represents an improvement of about 100 times over chopper amplifiers using external capacitors. Pin 5 is an optional external clock input, useful for synchronization purposes. The LTC1050 is available in standard 8-pin metal can, plastic and ceramic dual-in-line packages as well as an SO-8 package. The LTC1050 can be an improved plug-in replacement for most standard op amps. FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ No External Components Required Noise Tested and Guaranteed Low Aliasing Errors Maximum Offset Voltage: 5µV Maximum Offset Voltage Drift: 0.05µV/°C Low Noise: 1.6µVP-P (0.1Hz to 10Hz) Minimum Voltage Gain: 130dB Minimum PSRR: 125dB Minimum CMRR: 120dB Low Supply Current: 1mA Single Supply Operation: 4.75V to 16V Input Common Mode Range Includes Ground Output Swings to Ground Typical Overload Recovery Time: 3ms APPLICATIO S ■ ■ ■ ■ ■ ■ Thermocouple Amplifiers Electronic Scales Medical Instrumentation Strain Gauge Amplifiers High Resolution Data Acquisition DC Accurate RC Active Filters , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO 5V 4 1/2 LTC1043 7 8 3 High Performance, Low Cost Instrumentation Amplifier 160 5V VOLTAGE NOISE DENSITY (nV/√Hz) 140 120 100 80 60 40 20 0 10 100 1k 10k FREQUENCY (Hz) 100k 1050 TA02 + – 7 6 VOUT LTC1050 2 11 DIFFERENTIAL INPUT 12 R1 13 16 0.01µF 14 CS 1µF CH 1µF 4 – 5V 1µF R2 1050 TA01 17 – 5V CMRR > 120dB AT DC CMRR > 120dB AT 60Hz DUAL SUPPLY OR SINGLE 5V GAIN = 1 + R2/R1 VOS = 5µV COMMON MODE INPUT VOLTAGE EQUALS THE SUPPLIES U U U Noise Spectrum 1050fb 1 LTC1050 ABSOLUTE AXI U RATI GS (Note 1) Operating Temperature Range LTC1050AC/C .................................. – 40°C to 85°C LTC1050H ..................................... – 40°C to 125°C LTC1050AM/M (OBSOLETE) .......... – 55°C to 125°C Total Supply Voltage (V + to V –) .............................. 18V Input Voltage ........................ (V + + 0.3V) to (V – – 0.3V) Output Short-Circuit Duration ......................... Indefinite Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C PACKAGE/ORDER I FOR ATIO TOP VIEW NC 8 NC 1 –IN 2 +IN 3 4 7 V + (CASE) 6 OUT 5 EXT CLOCK INPUT ORDER PART NUMBER LTC1050ACH LTC1050CH LTC1050AMH LTC1050MH NC 1 –IN 2 +IN 3 V– 4 V– H PACKAGE 8-LEAD TO-5 METAL CAN TJMAX = 150°C S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 150°C/W OBSOLETE PACKAGE TOP VIEW NC 1 –IN 2 +IN 3 V– 4 N8 PACKAGE 8-LEAD PDIP TJMAX = 150°C, θJA = 100°C/W J8 PACKAGE 8-LEAD CERDIP TJMAX = 150°C, θJA = 100°C/W 8 7 6 5 NC V+ OUT EXT CLOCK INPUT ORDER PART NUMBER NC 1 2 3 4 5 6 7 TOP VIEW 14 NC 13 NC 12 NC 11 V + 10 OUT 9 8 N PACKAGE 14-LEAD PDIP NC NC LTC1050ACN8 LTC1050CN8 LTC1050ACJ8 LTC1050CJ8 LTC1050AMJ8 LTC1050MJ8 NC NC –IN +IN NC V– OBSOLETE PACKAGE Consider the N8 Package for Alternate Source TJMAX = 150°C, θJA = 70°C/W Consult LTC Marketing for parts specified with wider operating temperature ranges. The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ± 5V PARAMETER Input Offset Voltage Average Input Offset Drift Long Term Offset Voltage Drift Input Offset Current Input Bias Current Input Noise Voltage CONDITIONS (Note 3) (Note 3) (Note 5) ● ● ELECTRICAL CHARACTERISTICS MIN LTC1050AM TYP MAX ± 0.5 ± 0.01 50 ± 20 ± 10 ±5 ± 0.05 ± 60 ± 300 ± 30 ± 2000 2.1 (Note 5) ● 0.1Hz to 10Hz (Note 6) DC to 1Hz 2 – + U U W WW U W TOP VIEW 8 7 6 5 NC V+ OUT EXT CLOCK INPUT ORDER PART NUMBER LTC1050CS8 LTC1050HS8 S8 PART MARKING 1050 1050H ORDER PART NUMBER LTC1050CN MIN LTC1050AC TYP MAX ± 0.5 ± 0.01 50 ± 20 ±10 1.6 0.6 ±5 ± 0.05 ± 60 ±150 ± 30 ±100 2.1 UNITS µV µV/°C nV/√Mo pA pA pA pA µVP-P µVP-P 1050fb 1.6 0.6 LTC1050 The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ± 5V PARAMETER Input Noise Current Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Slew Rate Gain Bandwidth Product Supply Current Internal Sampling Frequency CONDITIONS f = 10Hz (Note 4) VCM = V – to 2.7V VS = ± 2.375V to ± 8V RL = 10k, VOUT = ± 4V RL = 10k RL = 100k RL = 10k, CL = 50pF No Load ● ELECTRICAL CHARACTERISTICS MIN 114 110 125 130 ± 4.7 LTC1050AM TYP MAX 1.8 140 140 160 ± 4.85 ± 4.95 4 2.5 1 2.5 MIN 114 110 125 130 ± 4.7 LTC1050AC TYP MAX 1.8 140 140 160 ± 4.85 ± 4.95 4 2.5 1 2.5 UNITS fA/√Hz dB dB dB dB V V V/µs MHz mA mA kHz ● ● ● ● 1.5 2.3 1.5 2.3 The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ± 5V PARAMETER Input Offset Voltage Average Input Offset Drift Long Term Offset Voltage Drift Input Offset Current Input Bias Current Input Noise Voltage Input Noise Current Common Mode Rejection Ratio CONDITIONS (Note 3) (Note 3) (Note 5) ● ● MIN LTC1050M/H TYP MAX ± 0.5 ± 0.01 50 ± 20 ± 10 ±5 ± 0.05 ± 100 ± 300 ± 50 ± 2000 MIN LTC1050C TYP MAX ± 0.5 ± 0.01 50 ± 20 ±10 1.6 0.6 1.8 130 ±5 ± 0.05 ± 125 ±200 ± 75 ±150 UNITS µV µV/°C nV/√Mo pA pA pA pA µVP-P µVP-P fA/√Hz dB dB dB dB dB dB V V V/µs MHz mA mA kHz (Note 5) ● Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Slew Rate Gain Bandwidth Product Supply Current Internal Sampling Frequency RS = 100Ω, 0.1Hz to 10Hz (Note 6) RS = 100Ω, DC to 1Hz f = 10Hz (Note 4) VCM = V – to 2.7V LTC1050M/C LTC1050H VS = ± 2.375V to ± 8V, LTC1050M/C LTC1050H RL = 10k, VOUT = ± 4V RL = 10k RL = 100k RL = 10k, CL = 50pF No Load ● ● ● ● ● ● 114 110 100 120 110 120 ± 4.7 1.6 0.6 1.8 130 114 110 120 120 ± 4.7 140 160 ± 4.85 ± 4.95 4 2.5 1 2.5 140 160 ± 4.85 ± 4.95 4 2.5 1 2.5 ● 1.5 2.3 1.5 2.3 Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: Connecting any terminal to voltages greater than V + or less than V – may cause destructive latchup. It is recommended that no sources operating from external supplies be applied prior to power-up of the LTC1050. Note 3: These parameters are guaranteed by design. Thermocouple effects preclude measurement of these voltage levels in high speed automatic test systems. VOS is measured to a limit determined by test equipment capability. Note 4: Current Noise is calculated from the formula: In = √(2q • Ib) where q = 1.6 • 10 –19 Coulomb. Note 5: At TA ≤ 0°C these parameters are guaranteed by design and not tested. Note 6: Every lot of LTC1050AM and LTC1050AC is 100% tested for Broadband Noise at 1kHz and sample tested for Input Noise Voltage at 0.1Hz to 10Hz. 1050fb 3 LTC1050 TYPICAL PERFOR A CE CHARACTERISTICS Offset Voltage vs Sampling Frequency 10 VS = ± 5V OFFSET VOLTAGE (µV) 6 5 4 3 2 1 COMMON MODE RANGE (V) 8 10Hz PEAK-TO-PEAK NOISE (µV) 6 4 2 0 2.0 2.5 3.5 4.0 3.0 SAMPLING FREQUENCY, fS (kHz) Sampling Frequency vs Supply Voltage 3.5 SAMPLING FREQUENCY, fS (kHz) TA = 25°C SAMPLING FREQUENCY, fS (kHz) 3.0 2.5 2.0 1.5 4 14 16 6 8 10 12 TOTAL SUPPLY VOLTAGE, V + TO V – (V) 1050 G04 Supply Current vs Supply Voltage 1.50 TA = 25°C 1.25 SUPPLY CURRENT, IS (mA) 1.8 SUPPLY CURRENT, IS (mA) VS = ± 5V SHORT-CIRCUIT OUTPUT CURRENT, IOUT (mA) 1.00 0.75 0.50 0.25 0 4 14 16 8 10 12 6 TOTAL SUPPLY VOLTAGE, V + TO V – (V) 1050 G07 4 UW 1050 G01 10HzP-P Noise vs Sampling Frequency 8 7 VS = ± 5V 8 6 4 2 0 –2 –4 –6 Common Mode Input Range vs Supply Voltage VCM = V – 4.5 0 100 1k SAMPLING FREQUENCY, fS (Hz) 10k 1050 G02 –8 0 ±1 ±2 ±3 ±4 ±5 ±6 SUPPLY VOLTAGE (V) ±7 ±8 1050 G03 Sampling Frequency vs Temperature 5 VS = ± 5V 200mV INPUT 0V Overload Recovery 4 3 OUTPUT 0V 2 – 5V 1 AV = – 100 VS = ± 5V 0.5ms/DIV 1050 G6 0 50 25 –50 –25 0 75 100 AMBIENT TEMPERATURE, TA (°C) 125 1050 G05 Supply Current vs Temperature 2.0 6 4 2 0 –10 –20 –30 Short-Circuit Output Current vs Supply Voltage 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 50 25 –50 –25 0 75 100 AMBIENT TEMPERATURE, TA (°C) 125 ISOURCE VOUT = V – ISINK VOUT = V + 4 14 16 8 10 12 6 TOTAL SUPPLY VOLTAGE, V + TO V – (V) 1050 G09 1050 G08 1050fb LTC1050 TYPICAL PERFOR A CE CHARACTERISTICS Gain/Phase vs Frequency 120 100 80 VOLTAGE GAIN (dB) 60 GAIN 40 20 0 – 20 VS = ± 5V TA = 25°C CL = 100pF RL ≥ 1k 1k 10k 100k FREQUENCY (Hz) 1M – 40 100 LTC1050 DC to 1Hz Noise 0.5µV 10 SEC LTC1050 DC to 10Hz Noise 1µV 1 SEC UW PHASE 1050 G10 Small-Signal Transient Response 60 80 100 120 140 160 180 200 220 10M VOUT 100mV STEP 2V PHASE SHIFT (DEGREES) Large-Signal Transient Response VIN = 6V AV = 1 RL = 10k CL = 100pF VS = ± 5V 1050 G11 AV = 1 RL = 10k CL = 100pF VS = ± 5V 1050 G12 1050 G13 1050 G14 1050fb 5 LTC1050 TEST CIRCUITS Electrical Characteristics Test Circuit 1M V+ 1k 2 100k DC-10Hz Noise Test Circuit 475k 0.015µF 10Ω – + 7 6 RL 1050 TC01 – LTC1050 158k 316k 0.015µF 475k LTC1050 3 4 V– OUTPUT – 0.015µF LT®1012 TO X-Y RECORDER + + FOR 1Hz NOISE BW, INCREASE ALL THE CAPACITORS BY A FACTOR OF10 1050 TC02 APPLICATI S I FOR ATIO ACHIEVING PICOAMPERE/MICROVOLT PERFORMANCE Picoamperes In order to realize the picoampere level of accuracy of the LTC1050, proper care must be exercised. Leakage currents in circuitry external to the amplifier can significantly degrade performance. High quality insulation should be used (e.g., Teflon, Kel-F); cleaning of all insulating surfaces to remove fluxes and other residues will probably be necessary— particularly for high temperature performance. Surface coating may be necessary to provide a moisture barrier in high humidity environments. Board leakage can be minimized by encircling the input connections with a guard ring operated at a potential close to that of the inputs: in inverting configurations the guard ring should be tied to ground; in noninverting connections to the inverting input (see Figure 1). Guarding both sides of the printed circuit board is required. Bulk leakage reduction depends on the guard ring width. Microvolts Thermocouple effect must be considered if the LTC1050’s ultralow drift is to be fully utilized. Any connection of dissimilar metals forms a thermoelectric junction producing an electric potential which varies with temperature (Seebeck effect). As temperature sensors, thermocouples exploit this phenomenon to produce useful information. In low drift amplifier circuits the effect is a primary source of error. Connectors, switches, relay contacts, sockets, resistors, solder and even copper wire are all candidates for thermal OUTPUT V– GUARD 1050 F01 Figure 1 EMF generation. Junctions of copper wire from different manufacturers can generate thermal EMFs of 200nV/°C— 4 times the maximum drift specification of the LTC1050. The copper/kovar junction, formed when wire or printed circuit traces contact a package lead, has a thermal EMF of approximately 35µV/°C—700 times the maximum drift specification of the LTC1050. Minimizing thermal EMF-induced errors is possible if judicious attention is given to circuit board layout and component selection. It is good practice to minimize the number of junctions in the amplifier’s input signal path. Avoid connectors, sockets, switches and relays where possible. In instances where this is not possible, attempt to balance the number and type of junctions so that differential cancellation occurs. Doing this may involve deliberately introducing junctions to offset unavoidable junctions. 1050fb 6 IN PU TS U V+ 7 6 OPTIONAL EXTERNAL CLOCK 5 4 3 2 8 1 W U UO LTC1050 APPLICATI S I FOR ATIO U PACKAGE-INDUCED OFFSET VOLTAGE Package-induced thermal EMF effects are another important source of errors. It arises at the copper/kovar junctions formed when wire or printed circuit traces contact a package lead. Like all the previously mentioned thermal EMF effects, it is outside the LTC1050’s offset nulling loop and cannot be cancelled. The input offset voltage specification of the LTC1050 is actually set by the package-induced warm-up drift rather than by the circuit itself. The thermal time constant ranges from 0.5 to 3 minutes, depending upon package type. OPTIONAL EXTERNAL CLOCK 1050 F02 Figure 2 is an example of the introduction of an unnecessary resistor to promote differential thermal balance. Maintaining compensating junctions in close physical proximity will keep them at the same temperature and reduce thermal EMF errors. NOMINALLY UNNECESSARY RESISTOR USED TO THERMALLY BALANCE OTHER INPUT RESISTOR LEAD WIRE/SOLDER/COPPER TRACE JUNCTION + LTC1050 OUTPUT – RESISTOR LEAD, SOLDER COPPER TRACE JUNCTION Figure 2 When connectors, switches, relays and/or sockets are necessary they should be selected for low thermal EMF activity. The same techniques of thermally balancing and coupling the matching junctions are effective in reducing the thermal EMF errors of these components. Resistors are another source of thermal EMF errors. Table 1 shows the thermal EMF generated for different resistors. The temperature gradient across the resistor is important, not the ambient temperature. There are two junctions formed at each end of the resistor and if these junctions are at the same temperature, their thermal EMFs will cancel each other. The thermal EMF numbers are approximate and vary with resistor value. High values give higher thermal EMF. Table 1. Resistor Thermal EMF RESISTOR TYPE Tin Oxide Carbon Composition Metal Film Wire Wound Evenohm Manganin THERMAL EMF/°C GRADIENT ~mV/°C ~450µV/°C ~20µV/°C ~2µV/°C ~2µV/°C SAMPLING FREQUENCY, fS (kHz) W U UO An external clock is not required for the LTC1050 to operate. The internal clock circuit of the LTC1050 sets the nominal sampling frequency at around 2.5kHz. This frequency is chosen such that it is high enough to remove the amplifier 1/f noise, yet still low enough to allow internal circuits to settle.The oscillator of the internal clock circuit has a frequency 4 times the sampling frequency and its output is brought out to Pin 5 through a 2k resistor. When the LTC1050 operates without using an external clock, Pin 5 should be left floating and capacitive loading on this pin should be avoided. If the oscillator signal on Pin 5 is used to drive other external circuits, a buffer with low input capacitance is required to minimize loading on this pin. Figure 3 illustrates the internal sampling frequency versus capacitive loading at Pin 5. 3 VS = ± 5V 2 1 1 5 10 CAPACITANCE LOADING (pF) 100 1050 F03 Figure 3. Sampling Frequency vs Capacitance Loading at Pin 5 1050fb 7 LTC1050 APPLICATI S I FOR ATIO U PSRR is guaranteed down to 4.7V (± 2.35V) to ensure proper operation down to the minimum TTL specified voltage of 4.75V. PIN COMPATIBILITY The LTC1050 is pin compatible with the 8-pin versions of 7650, 7652 and other chopper-stabilized amplifiers. The 7650 and 7652 require the use of two external capacitors connected to Pin 1 and Pin 8 that are not needed for the LTC1050. Pin 1 and Pin 8 of the LTC1050 are not connected internally while Pin 5 is an optional external clock input pin. The LTC1050 can be a direct plug-in for the 7650 and 7652 even if the two capacitors are left on the circuit board. In applications operating from below 16V total power supply, (± 8V), the LTC1050 can replace many industry standard operational amplifiers such as the 741, LM101, LM108, OP07, etc. For devices like the 741 and LM101, the removal of any connection to Pin 5 is all that is needed. * LT1009 350Ω BRIDGE 3 10k ZERO 5V When an external clock is used, it is directly applied to Pin 5. The internal oscillator signal on Pin 5 has very low drive capability and can be overdriven by any external signal. When the LTC1050 operates on ± 5V power supplies, the external clock level is TTL compatible. Using an external clock can affect performance of the LTC1050. Effects of external clock frequency on input offset voltage and input noise voltage are shown in the Typical Performance Characteristics section. The sampling frequency is the external clock frequency divided by 4. Input bias currents at temperatures below 100°C are dominated by the charge injection of input switches and they are basically proportional to the sampling frequency. At higher temperatures, input bias currents are mainly due to leakage currents of the input protection devices and are insensitive to the sampling frequency. LOW SUPPLY OPERATION The minimum supply for proper operation of the LTC1050 is typically below 4V (± 2V). In single supply applications, TYPICAL APPLICATI Strain Gauge Signal Conditioner with Bridge Excitation 120Ω 2.5V 5V 5V 2 – + 7 6 2k LTC1050 3 4 – 5V 8 W UO U UO S + – 7 6 R2 0.1% OUTPUT ± 2.5V C** LTC1050 2 4 – 5V 301k RN60C 1N4148 2N2907 51Ω 2W – 5V GAIN TRIM R1 0.1% 1050 TA03 *OPTIONAL REFERENCE OUT TO MONITORING 10-BIT A/D CONVERTER **AT GAIN = 1000, 10Hz PEAK-TO-PEAK NOISE IS < 0.5LSB FOR 10-BIT RESOLUTION 1050fb LTC1050 TYPICAL APPLICATI UO – + 2 0.1µF S Air Flow Detector 10k 100k 1% 1k LT1004-1.2 43.2Ω 1% 3 5V Single Supply Thermocouple Amplifier 1k 1% 100Ω 255k 1% 0.068µF 2 – + 7 6 5V = NO AIR FLOW 0V = AIR FLOW 5V 5V 2 K LT1025A GND 4 R– 5 TYPE K 0°C ~ 100°C TEMPERATURE RANGE 1050 TA04 LTC1050 4 2 7 6 VOUT 10mV/°C AMBIENT TEMPERATURE STILL AIR LTC1050 7 3 – + 0.1µF 4 – + TYPE K – 240Ω + AIR FLOW 1050 TA06 Battery-Operated Temperature Monitor with 10-Bit Serial Output A/D VIN = 9V LT1021C-5 4 1k 0.1% 3.4k 1% 0.33µF 6 + 10µF 178k 0.1% 1N4148 LTC1092 2 2 VIN LT1025A GND 4 R– 5 TYPE J 0°C ~ 500°C TEMPERATURE RANGE 2°C MAX ERROR *THERMOCOUPLE LINEARIZATION CODE AVAILABLE FROM LTC J 8 3 – + 7 6 47Ω 1 2 3 1µF CS +IN –IN GND VCC CLK DOUT VREF 1050 TA05 8 7 6 5 TO µP* LTC1050 – + 1µF 4 4 1050fb 9 LTC1050 TYPICAL APPLICATI UO 2 S ± 100mA Output Drive 10k VIN 10k 5V 2 5V 100pF 6 100k VOUT LT1010 ± 100mA RL 1050 TA08 Fast Precision Inverter 10k 1% INPUT 5pF 10k 100pF 1000pF 5V 5V 2 3 – + 7 LTC1050 4 – 5V – + 7 LT318A 6 OUTPUT – + 7 6 3 – 5V 10k LTC1050 3 4 – 5V 4 – 5V 1050 TA07 10k FULL POWER BANDWIDTH = 10kHz VOS = 5µV VOS/∆T = 50nV/°C GAIN = 10 FULL POWER BANDWIDTH = 2MHz SLEW RATE ≥ 40V/µs SETTLING TIME = 5µs TO 0.01% (10V STEP) OFFSET VOLTAGE = 5µV OFFSET DRIFT = 50nV/°C Ground Referred Precision Current Sources LT1034 0 ≤ IOUT ≤ 25mA* 0.2V ≤ VOUT ≤ (V +) – 2V *MAXIMUM CURRENT LIMITED BY POWER DISSIPATION OF 2N2222 3 6 RSET 10k 2 + VOUT V+ 2N2222 10k 2 – IOUT = 1.235V RSET – + 7 + – 7 6 RSET LTC1050 3 4 LTC1050 4 + – IOUT = 1.235V RSET 2N2907 V– LT1034 VOUT 0 ≤ IOUT ≤ 25mA* (V –) + 2V ≤ VOUT ≤ – 1.8V *MAXIMUM CURRENT LIMITED BY POWER DISSIPATION OF 2N2907 1050 TA09 1050fb 10 LTC1050 TYPICAL APPLICATI UO 2 LTC1043 NC 6 5 3 S Precision Voltage Controlled Current Source with Ground Referred Input and Output 5V INPUT 0V TO 3.2V 3 + – 7 6 2N2222 LTC1050 2 4 0.68µF 5V 1k 4 LTC1043 8 7 11 1µF 12 1µF 100Ω 14 17 0.001µF 13 16 IOUT = VIN 100Ω 1050 TA10 Sample-and-Hold Amplifier Ultraprecision Voltage Inverter LTC1043 – LTC1050 6 VOUT VIN 7 8 + 11 C1 1µF 12 C2 1µF 2 V+ 2 SAMPLE HOLD 16 VIN 17 CL 0.01µF – + 7 6 VOUT LTC1050 1050 TA11 13 16 0.01µF 14 17 3 4 V– FOR 1V ≤ VIN ≤ 4V, THE HOLD STEP IS ≤ 300µV. ACQUISTION TIME IS DETERMINED BY THE SWITCH RON. CL TIME CONSTANT 1050 TA12 FOR VS = ± 5V, (V – ) + 1.8V < VIN < V + VOUT = – VIN ± 20ppm MATCHING BETWEEN C1 AND C2 NOT REQUIRED 1050fb 11 LTC1050 TYPICAL APPLICATI Instrumentation Amplifier with Low Offset and Input Bias Current C Instrumentation Amplifier with 100V Common Mode Input Voltage 1k V+ 1M V+ 6 1k 2 + VIN – 12 UO – + S 2 – LTC1050 6 1k 0.1% 100k 0.1% 3 + 2 – LTC1050 6 OUTPUT INPUT 3 3 + 100k 0.1% + LTC1050 6 1k 0.1% 2 – 1050 TA13 OFFSET VOLTAGE ≤ ± 10µV INPUT BIAS CURRENT = 15pA CMRR = 100dB FOR GAIN = 100 INPUT REFERRED NOISE = 5µVP-P FOR C = 0.1µF = 20µVP-P FOR C = 0.01µF 1M 2 – + 7 1M LTC1050 3 1k 4 V– – + 7 6 VOUT LTC1050 3 4 V– 1050 TA14 OUTPUT OFFSET ≤ 5mV FOR 0.1% RESISTORS, CMRR = 54dB Single Supply Instrumentation Amplifier 1k V+ 1M 2 1M V+ 6 1k 2 – + 7 LTC1050 –VIN 3 4 – + 7 6 VOUT LTC1050 +VIN 3 4 1050 TA15 OUTPUT OFFSET ≤ 5mV FOR 0.1% RESISTORS, CMRR = 54dB 1050fb LTC1050 TYPICAL APPLICATI 10k 0.1% VIN IIN 2 3 ERROR REFERRED TO INPUT