LTC6081/LTC6082 Precision Dual/Quad CMOS Rail-to-Rail Input/ Output Amplifiers Description Features Maximum Offset Voltage: 70V (25C) Maximum Offset Drift: 0.8V/C Maximum Input Bias: 1pA (25C) 40pA (TA 85C) Open Loop Voltage Gain: 120dB Typ Gain Bandwidth Product: 3.6MHz CMRR: 100dB Min PSRR: 98dB Min 0.1Hz to 10Hz Noise: 1.3VP-P Supply Current: 330A Rail-to-Rail Inputs and Outputs Unity Gain Stable 2.7V to 5.5V Operation Voltage Dual LTC6081 in 8-Lead MSOP and 10-Lead DFN10 Packages; Quad LTC6082 in 16-Lead SSOP and DFN Packages The LTC(R)6081/LTC6082 are dual/quad low offset, low drift, low noise CMOS operational amplifiers with rail-to-rail input/output swing. The 70V maximum offset, 1pA input bias current, 120dB open loop gain and 1.3VP-P 0.1Hz to 10Hz noise make it perfect for precision signal conditioning. The LTC6081/ LTC6082 features 100dB CMRR and 98dB PSRR. Each amplifier consumes only 330A of current on a 3V supply. The 10-lead DFN has an independent shutdown function that reduces each amplifier's supply current to 1A. LTC6081/LTC6082 is specified for power supply voltages of 3V and 5V from -40C to 125C. The dual LTC6081 is available in 8-lead MSOP and 10-lead DFN10 packages. The quad LTC6082 is available in 16-lead SSOP and DFN packages. Applications Photodiode Amplifier Strain Gauge High Impedance Sensor Amplifier Microvolt Accuracy Threshold Detection Instrumentation Amplifiers Thermocouple Amplifiers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application VOS Drift Histogram Shock Sensor Amplifier (Accelerometer) 1G 2M 2M 3.9pF 3.9pF + 1/2 LTC6081 VOUT = 109mV/g BW ~ 2.2kHz - 1M V- 0.1F 10k 1M 60812 TA01 NUMBER OF AMPLIFIERS (OUT OF 100) 8.2pF MURATA PKGS-00LD 770pF 0 SENSOR 30 V+ 0.1F 47pF 25 LTC6081MS8 TA = -40C TO 125C VS = 3V VCM = 0.5V 20 15 10 5 0 -0.20 -0.10 0 0.10 VOSDRIFT (V/C) 0.20 0.30 60812 TA01b 60812fd For more information www.linear.com/LTC6081 1 LTC6081/LTC6082 Absolute Maximum Ratings (Note 1) Total Supply Voltage (V+ to V-)....................................6V Input Voltage....................................................... V- to V+ Output Short Circuit Duration (Note 2)............. Indefinite Operating Temperature Range (Note 3) LTC6081C, LTC6082C........................... -40C to 85C LTC6081I, LTC6082I.............................. -40C to 85C LTC6081H, LTC6082H......................... -40C to 125C (H Temperature Range Not Available in DFN Package) Specified Temperature Range (Note 4) LTC6081C, LTC6082C............................... 0C to 70C LTC6081I, LTC6082I.............................. -40C to 85C LTC6081H, LTC6082H......................... -40C to 125C Junction Temperature DFN Packages.................................................... 125C All Other Packages............................................. 150C Storage Temperature Range DFN Packages..................................... -65C to 125C All Other Packages.............................. -65C to 150C Lead Temperature (Soldering, 10 Sec)................... 300C pIN CONFIGURATION TOP VIEW OUTA 1 10 V+ -INA 2 9 OUTB +INA 3 V- 4 SHDN_A 5 A B TOP VIEW 8 -INB 7 +INB 6 SHDN_B DD PACKAGE 10-LEAD (3mm x 3mm) PLASTIC DFN TJMAX = 125C, JA = 43C/W UNDERSIDE METAL CONNECTED TO V- OUTA 1 -INA 2 +INA 3 V4- 1 16 OUTD -INA 2 +INA 3 14 +IND V+ 4 13 V- +INB 5 12 +INC -INB 6 11 -INC OUTB 7 10 OUTC NC 8 9 B C 15 -IND NC DHC PACKAGE 16-LEAD (5mm x 3mm) PLASTIC DFN TJMAX = 125C, JA = 43C/W UNDERSIDE METAL CONNECTED TO V- 2 V+ OUTB -INB +INB TOP VIEW OUTA D B 8 7 6 5 MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150C, JA = 200C/W TOP VIEW A A OUTA 1 -INA 2 +INA 3 14 +IND V+ 4 13 V- +INB 5 16 OUTD A B D C 15 -IND 12 +INC -INB 6 11 -INC OUTB 7 10 OUTC NC 8 9 NC GN PACKAGE 16-LEAD PLASTIC SSOP TJMAX = 150C, JA = 110C/W 60812fd For more information www.linear.com/LTC6081 LTC6081/LTC6082 order information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC6081CDD#PBF LTC6081CDD#TRPBF LCJP 10-Lead (3mm x 3mm) Plastic DFN 0C to 70C LTC6081IDD#PBF LTC6081IDD#TRPBF LCJP 10-Lead (3mm x 3mm) Plastic DFN -40C to 85C LTC6081CMS8#PBF LTC6081CMS8#TRPBF LTCJN 8-Lead Plastic MSOP 0C to 70C LTC6081IMS8#PBF LTC6081IMS8#TRPBF LTCJN 8-Lead Plastic MSOP -40C to 85C LTC6081HMS8#PBF LTC6081HMS8#TRPBF LTCJN 8-Lead Plastic MSOP -40C to 125C LTC6082CDHC#PBF LTC6082CDHC#TRPBF 6082 16-Lead (5mm x 3mm) Plastic DFN 0C to 70C LTC6082IDHC#PBF LTC6082IDHC#TRPBF 6082 16-Lead (5mm x 3mm) Plastic DFN -40C to 85C LTC6082CGN#PBF LTC6082CGN#TRPBF 6082 16-Lead Plastic SSOP 0C to 70C LTC6082IGN#PBF LTC6082IGN#TRPBF 6082I 16-Lead Plastic SSOP -40C to 85C LTC6082HGN#PBF LTC6082HGN#TRPBF 6082H 16-Lead Plastic SSOP -40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. 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/ 60812fd For more information www.linear.com/LTC6081 3 LTC6081/LTC6082 Electrical Characteristics The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. Test conditions are V+ = 3V, V- = 0V, VCM = 0.5V unless otherwise noted. C, I SUFFIXES SYMBOL PARAMETER VOS Offset Voltage CONDITIONS MIN LTC6081MS8, LTC6082GN LTC6081MS8, LTC6082GN LTC6081DD, LTC6082DHC LTC6081DD, LTC6082DHC VCM = 0.5V, 2.5V VCM = 0.5V, 2.5V VCM = 0.5V, 2.5V VCM = 0.5V, 2.5V VOS T Input Offset Voltage Drift (Note 5) IB Input Bias Current (Note 6) IOS Input Offset Current en Input Referred Noise In Input Noise Current Density (Note 7) TYP -70 -90 -70 -90 -70 -90 MAX 70 90 UNITS V V V V 0.2 0.8 V/C 0.2 1 40 0.2 1 500 pA pA 100 pA pA 0.1 0.1 15 13 1.3 13 1.3 nV/Hz VP-P 0.5 0.5 fA/Hz V- 70 90 70 90 TYP 0.8 Input Common Mode Range MIN 0.2 Noise Density at f = 1kHz Integrated Noise From 0.1Hz to 10Hz H SUFFIX MAX V+ V- V+ V CDIFF Differential Input Capacitance 3 3 pF CCM Common Mode Input Capacitance 7 7 pF CMRR Common Mode Rejection Ratio PSRR VCM = 0V to 1.5V VCM = 0V to 1.5V VCM = 0V to 3V VCM = 0V to 3V Power Supply Rejection Ratio VS = 2.7V to 5.5V 95 88 93 88 105 100 105 100 95 86 93 86 105 100 105 100 dB dB dB dB 98 96 110 98 96 110 dB dB -32 -320 1 mV mV mV Output Voltage, High, Either Output Pin No Load ISOURCE = 0.5mA ISOURCE = 5mA Output Voltage, Low, Either Output Pin (Referred to V-) No Load ISINK = 0.5mA ISINK = 5mA AVOL Large-Signal Voltage Gain RLOAD = 10k, 0.5V < VOUT < 2.5V 110 ISC Output Short-Circuit Current Source Sink 17 17 SR Slew Rate AV = 1 GBW Gain-Bandwidth Product (fTEST = 50kHz) RL = 100k VOUT 1 1 -35 -350 1 33 300 120 110 2.5 1.8 120 3.6 2.5 1.5 mV mV mV dB 15 15 1 40 360 mA mA 1 V/s 3.6 MHz MHz F0 Phase Margin RL = 10k 70 70 Deg tS Settling Time 0.1% AV = 1, 1V Step 6 6 s IS Supply Current (Per Amplifier) No Load Shutdown Current (Per Amplifier) Shutdown, VSHDN 0.8V Supply Voltage Range Guaranteed by the PSRR Test Channel Separation fs = 10kHz, RL = 10k VS 4 330 0.5 2.7 400 435 400 460 A A A A 2 5.5 -120 330 2.7 5.5 -120 V dB 60812fd For more information www.linear.com/LTC6081 LTC6081/LTC6082 Electrical Characteristics The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. Test conditions are V+ = 3V, V- = 0V, VCM = 0.5V unless otherwise noted. C, I SUFFIXES SYMBOL PARAMETER CONDITIONS MIN TYP 2 H SUFFIX MAX MIN TYP 2 MAX UNITS V V Shutdown Logic SHDN High SHDN Low THD Total Harmonic Distortion f = 10kHz, V+ = 3V, VOUT = 1VP-P , RL = 10k -90 -90 dB tON Turn-On Time VSHDN = 0.8V to 2V 10 10 s tOFF Turn-Off Time VSHDN = 2V to 0.8V SHDN Pin Current VSHDN = 0V 0.8 2 0.8 2 s 2 A The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. Test conditions are V+ = 5V, V- = 0V, VCM = 0.5V unless otherwise noted. C, I SUFFIXES SYMBOL PARAMETER VOS Offset Voltage CONDITIONS MIN LTC6081MS8, LTC6082GN LTC6081MS8, LTC6082GN LTC6081DD, LTC6082DHC LTC6081DD, LTC6082DHC VCM = 0.5V VCM = 0.5V VCM = 0.5V VCM = 0.5V VOS T Input Offset Voltage Drift (Note 8) IB Input Bias Current IOS Input Offset Current en Input Referred Noise In Input Noise Current Density (Note 7) TYP -70 -90 -70 -90 0.2 0.2 0.1 f = 1kHz 0.1Hz to 10Hz Input Common Mode Range MIN 70 90 70 90 -70 -90 0.8 TYP 70 90 0.2 0.2 40 0.1 15 MAX UNITS V V V V 0.8 V/C 500 pA pA 100 pA pA 13 1.3 13 1.3 nV/Hz VP-P 0.5 0.5 fA/Hz V- H SUFFIX MAX V+ V- V+ V CDIFF Differential Input Capacitance 3 3 pF CCM Common Mode Input Capacitance 7 7 pF CMRR Common Mode Rejection Ratio PSRR VOUT AVOL VCM = 0V to 3.5V VCM = 0V to 3.5V VCM = 0V to 5V Power Supply Rejection Ratio VS = 2.7V to 5.5V 100 95 86 110 110 95 100 94 86 110 110 95 dB dB dB 98 96 110 98 96 110 dB dB -24 -200 1 mV mV mV Output Voltage, High, Either Output Pin (Referred to V+) No Load ISOURCE = 0.5mA ISOURCE = 5mA Output Voltage, Low, Either Output Pin (Referred to V-) No Load ISINK = 0.5mA ISINK = 5mA Large-Signal Voltage Gain RLOAD = 10k, 0.5V < VOUT < 4.5V 1 1 110 120 -25 -220 1 27 210 110 120 32 240 mV mV mV dB 60812fd For more information www.linear.com/LTC6081 5 LTC6081/LTC6082 Electrical Characteristics The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. Test conditions are V+ = 5V, V- = 0V, VCM = 0.5V unless otherwise noted. C, I SUFFIXES SYMBOL PARAMETER CONDITIONS MIN ISC Output Short-Circuit Current Source Sink SR Slew Rate AV = 1 GBW Gain-Bandwidth Product (fTEST = 50kHz) RL = 100k F0 Phase Margin RL = 10k tS Settling Time 0.1% AV = 1, 1V Step IS Supply Current (Per Amplifier) No Load Shutdown Current (Per Amplifier) Supply Voltage Range VS TYP H SUFFIX MAX 24 24 MIN 2.5 1.8 MAX 21 21 1 TYP UNITS mA mA 1 V/s 3.5 MHz MHz 70 70 Deg 6 6 s 3.5 340 2.5 1.5 425 465 Shutdown, VSHDN 1.2V 6 Guaranteed by the PSRR Test 2.7 3.5 5.5 340 425 490 A A A 2.7 Channel Separation fs = 10kHz, RL = 10k SHDN High SHDN Low THD Total Harmonic Distortion f = 10kHz, V+ = 5V, VOUT = 2VP-P , RL = 10k -90 -90 dB tON Turn-On Time VSHDN = 1.2V to 3.5V 10 10 s tOFF Turn-Off Time VSHDN = 3.5V to 1.2V 2 2 s SHDN Pin Current VSHDN = 0V 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: A heat sink may be required to keep the junction temperature below the absolute maximum. This depends on the power supply voltage and how many amplifiers are shorted. Note 3: The LTC6081C/LTC6082C and LTC6081I/LTC6082I are guaranteed functional over the operating temperature range of -40C to 85C. The LTC6081H/LTC6082H are guaranteed functional over the operating temperature range of -40C to 125C. Note 4: The LTC6081C/LTC6082C are guaranteed to meet specified performance from 0C to 70C. The LTC6081C/LTC6082C are designed, -120 V Shutdown Logic 6 -120 5.5 1.2 2 3.5 dB 1.2 V V A characterized and expected to meet specified performance from -40C to 85C but are not tested or QA sampled at these temperatures. The LTC6081I/LTC6082I are guaranteed to meet specified performance from -40C to 85C. The LTC6081H/LTC6082H are guaranteed to meet specified performance from -40C to 125C. Note 5: Input offset drift is computed from the limits of the VOS test divided by the temperature range. This is a conservative estimate of worst case drift. Consult the Typical Performance Characteristics section for more information on input offset drift. Note 6: IB guaranteed by the VS = 5V test. Note 7: Current noise is calculated from In = 2qIB , where q = 1.6 * 10-19 coulomb. Note 8: VOS drift is guaranteed by the VS = 3V test. 60812fd For more information www.linear.com/LTC6081 LTC6081/LTC6082 Typical Performance Characteristics VOS Drift Histogram 25 20 15 10 5 0 -0.20 -0.10 0 0.10 VOSDRIFT (V/C) 20 10 5 -15 60812 G02 60812 G03 VOS vs VCM 140 100 80 0 4 -20 2 -30 0 -9.5 -40 -1.5 2.5 VOS (V) 6.5 10.5 0 SOURCING CURRENT -4 -20 0 0.5 1.0 1.5 2.0 VCM (V) 2.5 -40 3.0 SINKING CURRENT 0 2 -2 OUTPUT CURRENT (mA) 4 VS = 3V 60812 G07 60812 G06 80 70 60 50 40 VS = 5V VCM = 0.5V 30 20 0 5 90 0 -5 4 TA = 25C 100 VS = 3V VCM = 0.5V 10 6 3 Noise Voltage vs Frequency 10 5 2 110 VS = 5V 15 1 60812 G05 TA = 25C VCM = 0.5V 20 0 VCM (V) NOISE VOLTAGE (nV/Hz) TA = 55C -6 0 25 TA = 125C 50 -50 40 Warm-Up Drift vs Time TA = 25C 100 60 20 60812 G04 CHANGE IN OFFSET VOLTAGE (V) VS = 5V VCM = 2.5V VS = 5V TA = 25C REPRESENTATIVE PARTS 120 10 VOS vs Output Current VOS (V) -20 -50 -30 -10 10 30 50 70 90 110 130 TEMPERATURE (C) 0.20 -10 6 -100 -0.10 0 0.10 VOSDRIFT (V/C) 20 8 150 -0.20 VS = 3V TA = 25C REPRESENTATIVE PARTS 30 10 200 -5 40 12 -5.5 0 VOS vs VCM VOS (V) NUMBER OF AMPS (OUT OF 100) 14 5 -10 60812 G01 LTC6081MS8 TA = 25C VS = 3V VCM = 0.5V 16 15 10 VOS Histogram 18 LTC6081MS8 VS = 3V VCM = 0.5V REPRESENTATIVE PARTS 20 15 0 -0.30 0.30 0.20 25 LTC6081DFN TA = -40C TO 125C VS = 3V VCM = 0.5V VOS (V) 25 VOS vs Temperature VOS (V) LTC6081MS8 TA = -40C TO 125C VS = 3V VCM = 0.5V NUMBER OF AMPS (OUT OF 100) NUMBER OF AMPS (OUT OF 100) 30 VOS Drift Histogram 5 10 15 20 25 30 35 40 45 50 55 60 TIME AFTER POWER UP (s) 60812 G08 0 1 10 100 1k FREQUENCY (Hz) 10k 100k 60812 G09 60812fd For more information www.linear.com/LTC6081 7 LTC6081/LTC6082 Typical Performance Characteristics 0.1Hz to 10Hz Output Voltage Noise Noise Voltage vs Frequency NMOS INPUTS VCM = 2.5V 1 10 100 1k FREQUENCY (Hz) 0 100k 10k 60812 G10 5 10 15 20 25 30 35 40 45 50 TIME (s) 0 40 IBIAS vs VCM 500 LTC6081MS8 VS = 5V 30 300 200 TA = 70C 0 -10 40 60 80 100 TEMPERATURE (C) 120 140 100 0 -100 -20 20 IBIAS (pA) 10 0.1 TA = 85C -200 -30 -300 -40 -400 -50 60812 G13 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCM (V) -500 60812 G15 Small Signal Transient Overshoot vs CL 55 50 45 TA = 25C VS = 1.5V RL = 10k CL = 100pF 200s/DIV 20mV/DIV GND 60812 G16 TA = 25C VS = 1.5V RL = 10k CL = 100pF 20s/DIV 60812 G17 AV = 1 35 30 AV = 10 25 20 15 10 5 0 8 TA = 25C VS = 3V VCM = 0.5V 40 OVERSHOOT (%) GND 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCM (V) 0 60812 G14 Large Signal Transient 0.5V/DIV LTC6081MS8 VS = 5V TA = 125C 400 20 100 1 10 15 20 25 30 35 40 45 50 TIME (s) 60812 G12 IBIAS vs VCM VS = 5V VCM = 2.5V 10 5 60812 G11 IBIAS (pA) INPUT BIAS CURRENT (pA) TA = 25C VS = 3V VCM = 2.5V OUTPUT NOISE (1V/DIV) PMOS INPUTS VCM = 0.5V Input Bias Current vs Temperature 1000 TA = 25C VS = 3V VCM = 0.5V VS = 3V TA = 25C OUTPUT NOISE (500nV/DIV) NOISE VOLTAGE (nV/Hz) 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 0 0.1Hz to 10Hz Output Voltage Noise 10 100 1000 CAPACITIVE LOAD (pF) 10000 60812 G18 60812fd For more information www.linear.com/LTC6081 LTC6081/LTC6082 Typical Performance Characteristics TA = 25C NO BYPASS CAPACITOR VS = 5V VS = 3V 330 310 290 270 1200 800 2 400 1 0 100 0 200 300 TIME (s) Open Loop Gain INPUT VOLTAGE (V) RL = 2k 0 0.5 1.0 1.5 2.0 OUTPUT VOLTAGE (V) 2.5 3.0 RL = 100k -10 RL = 10k -20 RL = 2k 0 80 -180 GAIN -40 100 -90 0 -20 VS = 5V VCM = 0.5V TA = 25C CL = 200pF 1k 10k 1M 100k FREQUENCY (Hz) 10M 0 -90 0 -40 1k 10k -270 1M 100k FREQUENCY (Hz) 10M VS = 5V VCM = 0.5V TA = 25C RL = 1k 60 40 80 60 40 20 -360 0 0 1k 10k 100k 1M FREQUENCY (Hz) 60812 G24 10M 100M 60812 G26 VS = 5V VCM = 0.5V TA = 25C 100 20 -20 100 -360 100M PSRR vs Frequency 120 -270 -450 100M 60812 G25 -180 VS = 5V VCM = 0.5V TA = 25C PSRR (dB) 20 90 PHASE (DEG) GAIN (dB) 40 RL = 10k RL = 100k CMRR (dB) PHASE 20 CMRR vs Frequency 120 180 90 60812 G23 180 100M 270 GAIN 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT VOLTAGE (V) Open Loop Gain vs Frequency 10M PHASE -20 0 10k 100k 1M FREQUENCY (Hz) RL = 10k RL = 100k 40 60812 G22 60 1k 60 VS = 5V TA = 25C 0 -40 VS = 3V VCM = 0.5V TA = 25C 60812 G21 -30 -30 AV = 1 PHASE (DEG) RL = 10k -20 0.1 Open Loop Gain vs Frequency 10 RL = 100k -10 AV = 10 1 60812 G20 20 VS = 3V TA = 25C 0 AV = 100 10 0.01 100 Open Loop Gain 10 INPUT VOLTAGE (V) 0 500 400 60812 G19 20 100 SUPPLY CURRENT 250 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) -40 3 SUPPLY VOLTAGE 1000 4 SUPPLY VOLTAGE (V) 350 Output Impedance vs Frequency GAIN (dB) 370 SUPPLY CURRENT (A) 1600 VCM = 0.5V PER AMPLIFIER SUPPLY CURRENT OPAMP (A) 390 Supply Current vs Time OUTPUT IMPEDANCE () Supply Current vs Temperature -20 100 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 60812 G27 60812fd For more information www.linear.com/LTC6081 9 LTC6081/LTC6082 Typical Performance Characteristics Output Voltage Swing vs Load Current Channel Separation vs Frequency CHANNEL SEPARATION (dB) -20 -40 -60 -80 -100 -120 -140 100 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M 60812 G28 -20 +VS VS = 3V +VS -0.5 V = 0.5V CM +VS -1.0 SOURCE -40 +VS -1.5 +VS -2.0 -VS 2.0 -VS 1.5 -VS 1.0 -VS 0.5 -VS 0 0.01 VS = 5V AV = 1 RL = 10k VOUT = 2VP-P -30 DISTORTION (dBc) VS = 3V VCM = 0.5V RL = 10k OUTPUT VOLTAGE SWING (V) (REFERRED TO SUPPLY VOLTAGE) 0 Distortion vs Frequency TA = 125C TA = 25C TA = -55C -50 2ND -60 3RD -70 -80 SINK 1 10 0.1 LOAD CURRENT (mA) -90 100 -100 1 60789 G29 10 100 FREQUENCY (kHz) 1000 60812 G30 Pin Functions OUT: Amplifier Output -IN: Inverting Input +IN: Noninverting Input V+: Positive Supply V-: Negative Supply SHDN_A: Shutdown Pin of Amplifier A, active low and only valid for LTC6081DD. An internal current source pulls the pin to V+ when floating. SHDN_B: Shutdown Pin of Amplifier B, active low and only valid for LTC6081DD. An internal current source pulls the pin to V+ when floating. NC: Not internally connected. Exposed Pad: Connected to V-. 10 60812fd For more information www.linear.com/LTC6081 LTC6081/LTC6082 Applications Information Preserving Input Precision Rail-to-Rail Input Preserving input accuracy of the LTC6081/LTC6082 requires that the application circuit and PC board layout do not introduce errors comparable or greater than the 5V typical offset of the amplifiers. Temperature differentials across the input connections can generate thermocouple voltages of 10's of microvolts so the connections to the input leads should be short, close together and away from heat dissipating components. Air current across the board can also generate temperature differentials. The input stage of LTC6081/LTC6082 combines both PMOS and NMOS differential pairs, extending its input common mode voltage range to both positive and negative supply voltages. At high input common mode range, the NMOS pair is on. At low common mode range, the PMOS pair is on. The transition happens when the common voltage is between 1.3V and 0.9V below the positive supply. LTC6081 has better low frequency noise performance with PMOS input on due to its lower flicker noise (see Voltage Noise vs Frequency and 0.1Hz to 10Hz Input Voltage Noise in Typical Performance Characteristics). Capacitive Load LTC6081/LTC6082 can drive capacitive load up to 200pF in unity gain. The capacitive load driving capability increases as the amplifier is used in higher gain configurations. A small series resistance between the output and the load further increases the amount of capacitance the amplifier can drive. SHDN Pins Pins 5 and 6 are used for power shutdown on the LTC6081 in the DD package. If they are floating, internal current sources pull Pins 5 and 6 to V+ and the amplifiers operate normally. In shutdown, the amplifier output is high impedance, and each amplifier draws less than 2A current. Thermal Hysteresis Figure 1 shows the input offset voltage hysteresis of the LTC6081IMS8 for 3 thermal cycles from -45C to 90C. The typical offset shift is 4V. The data was taken with the ICs in stress free sockets. Mounting to PC boards may cause additional hysteresis due to mechanical stress. The LTC6081 will meet offset voltage specifications in the electrical characteristics table even after 15V of additional error from thermal hysteresis. 0.30 PERCENTAGE OF UNITS The extremely low input bias currents (0.1pA typical) allow high accuracy to be maintained with high impedance sources and feedback resistors. Leakage currents on the PC board can be higher than the input bias current. For example, 10G of leakage between a 5V supply lead and an input lead will generate 500pA! Surround the input leads with a guard ring driven to the same potential as the input common mode voltage to avoid excessive leakage in high impedance applications. VOS CHANGE AFTER 3 THERMAL CYCLES VCM = 0.5V + 0.25 V = 3V 300 UNITS 0.20 0.15 0.10 0.5 0 -15 -12 -9 -6 -3 0 3 6 VOS CHANGE (V) 9 12 15 60812 F01 Figure 1. VOS Thermal Hysteresis of LTC6081MS8 60812fd For more information www.linear.com/LTC6081 11 LTC6081/LTC6082 Applications Information PC Board Layout Mechanical stress on a PC board and soldering-induced stress can cause the VOS and VOS drift to shift. The DD and DHC packages are more sensitive to stress. A simple way to reduce the stress-related shifts is to mount the IC near the short edge of the PC board, or in a corner. The board edge acts as a stress boundary, or a region where the flexure of the board is minimum. The package should always be mounted so that the leads absorb the stress and not the package. The package is generally aligned with the leads perpendicular to the long side of the PC board (see Figure 2). The most effective technique to relieve the PC board stress is to cut slots in the board around the op amp. These slots can be cut on three sides of the IC and the leads can exit on the fourth side. Figure 2 shows the layout of a LTC6081DD with slots at three sides. LONG DIMENSION SLOTS 60812 F02 Figure 2. Vertical Orientation of LTC6081DD with Slots Simplified Schematic Simplified Schematic of the Amplifier V+ R1 M10 R2 M11 M8 V- VBIAS D4 C1 + I2 V+ - I1 1A A1 M5 V+ +IN V+ D3 V+ CLAMP V- D7 M1 OUTPUT CONTROL M6 M7 M2 D6 D8 -IN V- D5 D2 A2 + V- - BIAS GENERATION SHDN C2 D1 V- NOTE: SHDN IS ONLY AVAILABLE IN THE DFN10 PACKAGE M3 M9 M4 R3 V- 12 OUT R4 60812 SS 60812fd For more information www.linear.com/LTC6081 LTC6081/LTC6082 Typical Applications Low Side Current Sense 15pF VDD V+ I 100k - LOAD 1/2 LTC6081 + RSH 1k VOUT = RSH * I * 101 eNOISE = 3VP-P, RTI BW ~ 1kHz 60812 TA03 Two Op-Amp Instrumentation Amplifier GAIN TRIM 1.96k 100k 100k V+ 0.1F CMRR TRIM 976k 1M - 50k 1/2 LTC6081 - VIN + + 100k - 1/2 LTC6081 VOUT = 1011 * VIN + V- 0.1F 60812 TA04 60812fd For more information www.linear.com/LTC6081 13 LTC6081/LTC6082 Typical Applications Thermocouple Amplifier 5V 0.1F 1M + 1F 1M 1/2 LTC6081 VOUT = 10mV/C 0C TO 500C - 5V LT1025 2.49M K R- 10k 100pF SENSOR: OMEGA 5TC-TT-K-30-36 K-TYPE THERMOCOUPLE 1M RESISTORS PROTECT CIRCUIT TO 350V WITH NO PHASE REVERSAL OF AMPLIFIER OUTPUT 1pA MAX IBIAS TRANSLATES TO 0.05C ERROR 60812 TA05 20V VOS 0.5C OFFSET Precision Nanoamp Bidirectional Current Source VIN 100k + 1/4 LTC6082 100 - 1k GAIN TRIM 100 0.01F 5k 97.6k 100k 10-TURN 0.1F 2.5V 10M + 1/4 LTC6082 - IOUT = -1nA 1nA FOR VIN = -10V 10V TOTAL ERROR <1% (10pA) 14 100k 1/4 LTC6082 + 3.9pF - 100k 0.1F LOAD -2.5V IOUT 60812 TA06 60812fd For more information www.linear.com/LTC6081 LTC6081/LTC6082 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. DD Package 10-Lead Plastic DFN (3mm x 3mm) (Reference LTC DWG # 05-08-1699 Rev C) 0.70 0.05 3.55 0.05 1.65 0.05 2.15 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 0.05 0.50 BSC 2.38 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 3.00 0.10 (4 SIDES) R = 0.125 TYP 6 0.40 0.10 10 1.65 0.10 (2 SIDES) PIN 1 NOTCH R = 0.20 OR 0.35 x 45 CHAMFER PIN 1 TOP MARK (SEE NOTE 6) 0.200 REF 5 0.75 0.05 0.00 - 0.05 1 (DD) DFN REV C 0310 0.25 0.05 0.50 BSC 2.38 0.10 (2 SIDES) BOTTOM VIEW--EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2). CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 60812fd For more information www.linear.com/LTC6081 15 LTC6081/LTC6082 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. DHC Package 16-Lead Plastic DFN (5mm x 3mm) (Reference LTC DWG # 05-08-1706 Rev O) 0.65 0.05 3.50 0.05 1.65 0.05 2.20 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 0.05 0.50 BSC 4.40 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 5.00 0.10 (2 SIDES) R = 0.20 TYP 3.00 0.10 (2 SIDES) 9 R = 0.115 TYP 0.40 0.10 16 1.65 0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) PIN 1 NOTCH 0.200 REF 0.75 0.05 0.00 - 0.05 8 1 0.25 0.05 0.50 BSC (DHC16) DFN 1103 4.40 0.10 (2 SIDES) BOTTOM VIEW--EXPOSED PAD NOTE: 1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC PACKAGE OUTLINE MO-229 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 16 60812fd For more information www.linear.com/LTC6081 LTC6081/LTC6082 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. GN Package 16-Lead Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641 Rev B) .189 - .196* (4.801 - 4.978) .045 .005 16 15 14 13 12 11 10 9 .254 MIN .009 (0.229) REF .150 - .165 .229 - .244 (5.817 - 6.198) .0165 .0015 .150 - .157** (3.810 - 3.988) .0250 BSC RECOMMENDED SOLDER PAD LAYOUT 1 .015 .004 x 45 (0.38 0.10) .007 - .0098 (0.178 - 0.249) .0532 - .0688 (1.35 - 1.75) 2 3 4 5 6 7 8 .004 - .0098 (0.102 - 0.249) 0 - 8 TYP .016 - .050 (0.406 - 1.270) .008 - .012 (0.203 - 0.305) TYP NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) .0250 (0.635) BSC GN16 REV B 0212 3. DRAWING NOT TO SCALE 4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE *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 60812fd For more information www.linear.com/LTC6081 17 LTC6081/LTC6082 Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660 Rev G) 0.889 0.127 (.035 .005) 5.10 (.201) MIN 3.20 - 3.45 (.126 - .136) 3.00 0.102 (.118 .004) (NOTE 3) 0.65 (.0256) BSC 0.42 0.038 (.0165 .0015) TYP 8 7 6 5 0.52 (.0205) REF RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 0.102 (.118 .004) (NOTE 4) 4.90 0.152 (.193 .006) DETAIL "A" 0 - 6 TYP GAUGE PLANE 0.53 0.152 (.021 .006) DETAIL "A" 1 2 3 4 1.10 (.043) MAX 0.86 (.034) REF 0.18 (.007) SEATING PLANE 0.22 - 0.38 (.009 - .015) TYP 0.65 (.0256) BSC 0.1016 0.0508 (.004 .002) MSOP (MS8) 0213 REV G NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 18 60812fd For more information www.linear.com/LTC6081 LTC6081/LTC6082 Revision History (Revision history begins at Rev B) REV DATE DESCRIPTION PAGE NUMBER B 3/10 Change LT to LTC on all part numbers in Order Information Section. 3 C 07/10 Update to Simplified Schematic 12 D 12/13 Corrected resistor value (10M) 14 60812fd 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 its circuits as described herein will not infringe on existing patent rights. Forof more information www.linear.com/LTC6081 19 LTC6081/LTC6082 Typical Application Single Supply Strain Gauge Amplifier 3V CMRR TRIM 350 10M 9.76M 3.2V 0.1F 350 3V 10k 0.01F 100 100k 500k 0.1F LT1790B 1.25V 1/2 LTC6081 + 1/2 LTC6081 10M - 1.25V - 10M AV = 1001 + SENSOR: OMEGA SG-3/350-LY41 STRAIN GAUGE 60812 TA02 Related Parts PART NUMBER DESCRIPTION COMMENTS LT1678/LT1679 Dual/Quad Precision Op Amps Low Noise, 2.7V to 36V Operation LTC2050 Zero-Drift Op Amp 2.7V Operation, SOT-23 Package LTC2051/LTC2052 Dual/Quad Zero-Drift Op Amps MS8/GN16 Packages LTC2054/LTC2055 Single/Dual Zero-Drift Op Amp Micropower, SOT-23 and DFN Packages LTC6078/LTC6079 Dual/Quad Low Noise Precision CMOS Op Amps Micropower 0.7V/C VOS Drift LTC6241/LTC6242 Dual/Quad Low Noise CMOS Op Amps 18MHz Bandwidth,10V/s Slew Rate LTC6244 Dual 50MHz CMOS Op Amp Low Noise, Rail-to-Rail Out, MS8 and DFN Packages 20 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LTC6081 (408) 432-1900 FAX: (408) 434-0507 www.linear.com/LTC6081 60812fd LT 1213 REV D * PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2007