LT1490A/LT1491A Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Low Input Offset Voltage: 500µV Max Output Swings to 10mV Max from V – Rail-to-Rail Input and Output µA/Amplifier Max Micropower: 50µ ® Over-The-Top Input Common Mode Range Extends 44V Above V –, Independent of V + Specified on 3V, 5V and ±15V Supplies High Output Current: 20mA Output Drives 10,000pF with Output Compensation Reverse Battery Protection to 18V No Supply Sequencing Problems High Voltage Gain: 1500V/mV High CMRR: 98dB No Phase Reversal Gain Bandwidth Product: 200kHz Tiny 3mm × 3mm × 0.8mm DFN Package U APPLICATIO S ■ ■ ■ ■ ■ Battery- or Solar-Powered Systems Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring Micropower Active Filters 4mA to 20mA Transmitters U CHARGER VOLTAGE The LT1490A/LT1491A have a unique input stage that operates and remains high impedance when above the positive supply. The inputs take 44V both differential and common mode even when operating on a 3V supply. Built-in resistors protect the inputs for faults below the negative supply up to 15V. There is no phase reversal of the output for inputs 15V below V– or 44V above V–, independent of V+. The LT1490A dual op amp is available in the 8-pin MSOP, PDIP and SO packages. For space limited applications LT1490A is available in a 3mm × 3mm × 0.8mm, dual fine pitch leadless package (DFN). The quad LT1491A is available in the 14-pin SO, PDIP and 5mm × 3mm × 0.8mm DFN packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a registered trademark of Linear Technology Corporation. Protected by U.S. Patents including 5825228. TYPICAL APPLICATIO The LT®1490A/LT1491A are dual and quad op amps with a low input offset voltage of 500µV max. The LT1490A/LT1491A operate on all single and split supplies with a total voltage of 2V to 44V, drawing only 40µA of quiescent current per amplifier. These amplifiers are reverse supply protected; they draw virtually no current for reverse supply up to 18V. The input range of the LT1490A/LT1491A includes both supplies and the output swings to both supplies. Unlike most micropower op amps, the LT1490A/LT1491A can drive heavy loads; their rail-to-rail outputs drive 20mA. The LT1490A/LT1491A are unity-gain stable and drive all capacitive loads up to 10,000pF when optional 0.22µF and 150Ω compensation is used. Battery Monitor RS 0.2Ω RA 2k IBATT RA´ 2k + Q1 2N3904 1/4 LT1491A – – 1/4 LT1491A LOGIC + RB 2k RB´ 2k LOAD + Q2 2N3904 LOGIC HIGH (5V) = CHARGING LOGIC LOW (0V) = DISCHARGING 1/4 LT1491A – + + RG 10k VBATT = 12V S1 1/4 LT1491A VOUT – 10k 90.9k S1 = OPEN, GAIN = 1 S1 = CLOSED, GAIN = 10 RA = RB VS = 5V, 0V 1490A TA01 VOUT V IBATT = = OUT AMPS (RS)(RG /RA)(GAIN) GAIN sn1490, 14901afbs 1 LT1490A/LT1491A W W W AXI U U ABSOLUTE RATI GS (Note 1) Total Supply Voltage (V + to V –) ............................. 44V Differential Input Voltage ........................................ 44V Input Current (Note 9) ....................................... ±12mA Output Short-Circuit Duration (Note 2) ........ Continuous Operating Temperature Range (Note 3) LT1490AC/LT1491AC ......................... – 40°C to 85°C LT1490AI/LT1491AI ........................... – 40°C to 85°C LT1490AH/LT1491AH ...................... – 40°C to 125°C Specified Temperature Range (Note 4) LT1490AC/LT1490AI .......................... – 40°C to 85°C LT1491AC/LT1491AI .......................... – 40°C to 85°C LT1490AH/LT1491AH ...................... – 40°C to 125°C Junction Temperature .......................................... 150°C Junction Temperature (DD/DHC Package) ........... 125°C Storage Temperature Range ................ – 65°C to 150°C Storage Temperature Range DD/DHC Package ............................. – 65°C to 125°C Lead Temperature (Soldering, 10 sec)................. 300°C U U W PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW TOP VIEW OUT A –IN A +IN A V– 1 2 3 4 8 7 6 5 A B V+ OUT B –IN B +IN B MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 250°C/ W OUT A 1 –IN A 2 +IN A 3 8 V+ 7 OUT B –IN A 2 6 –IN B +IN A 3 OUT A 1 A V– B 4 5 N8 PACKAGE 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO V– 4 +IN B B V+ 7 OUT B 6 –IN B 5 +IN B DD PACKAGE 8-LEAD (3mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 160°C/ W (NOTE 2) UNDERSIDE METAL CONNECTED TO V – TJMAX = 150°C, θJA = 130°C/ W (N8) TJMAX = 150°C, θJA = 190°C/ W (S8) ORDER PART NUMBER A 8 MS8 PART MARKING ORDER PART NUMBER S8/N8 PART MARKING ORDER PART NUMBER DD PART MARKING* LTNG LTPU LTRK LT1490ACS8 LT1490AIS8 LT1490AHS8 1490A 1490AI 1490AH LT1490ACDD LT1490AIDD LAAH LT1490ACMS8 LT1490AIMS8 LT1490AHMS8 LT1490ACN8 LT1490AIN8 TOP VIEW 14 OUT D OUT A 1 –IN A 2 +IN A 3 A D V+ 4 +IN B 5 –IN B 6 13 –IN D 12 +IN D 11 V – B OUT B 7 N PACKAGE 14-LEAD PDIP C ORDER PART NUMBER LT1491ACS LT1491AIS LT1491AHS 10 +IN C 9 8 –IN C OUT C S PACKAGE 14-LEAD PLASTIC SO TJMAX = 150°C, θJA = 110°C/ W (N) TJMAX = 150°C, θJA = 150°C/ W (S) LT1491ACN LT1491AIN TOP VIEW OUT A 1 –IN A 2 +IN A 3 16 OUT D A D 15 –IN D 14 +IN D V+ 4 +IN B 5 13 V– –IN B 6 OUT B 7 10 OUT C NC 8 9 B C ORDER PART NUMBER LT1491ACDHC LT1491AIDHC 12 +IN C 11 –IN C NC DHC PART MARKING* 1491A DHC16 PACKAGE 16-LEAD (5mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 160°C/ W (NOTE 2) UNDERSIDE METAL CONNECTED TO V – *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. sn1490, 14901afbs 2 LT1490A/LT1491A ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range of – 40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage (Note 5) LT1490A N, S Packages 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C Input Offset Voltage Drift (Note 9) IOS UNITS 110 500 700 800 µV µV µV LT1490A MS8 Package, LT1491A N, S Packages ● 0°C ≤ TA ≤ 70°C ● – 40°C ≤ TA ≤ 85°C 220 1000 1200 1400 µV µV µV LT1490A DD, LT1491A DHC 0°C ≤ TA ≤ 70°C –40°C ≤ TA ≤ 85°C 250 1200 1400 1600 µV µV µV 2 2 4 6 ● ● 0.2 0.8 0.8 nA µA ● ● 1 3 0.3 8 10 nA µA nA ● ● ● ● – 40°C ≤ TA ≤ 85°C ● LT1490A DD, LT1491A DHC, – 40°C ≤ TA ≤ 85°C ● Input Offset Current VCM = 44V (Note 6) IB LT1490AC/LT1491AC LT1490AI/LT1491AI MIN TYP MAX Input Bias Current VCM = 44V (Note 6) VS = 0V Input Bias Current Drift – 40°C ≤ TA ≤ 85°C Input Noise Voltage 0.1Hz to 10Hz ● µV/°C µV/°C 2 pA/°C 1 µVP-P en Input Noise Voltage Density f = 1kHz 50 nV/√Hz in Input Noise Current Density f = 1kHz 0.015 pA/√Hz RIN Input Resistance Differential Common Mode, VCM = 0V to 44V CIN 6 4 Input Capacitance Input Voltage Range ● 0 17 11 MΩ MΩ 4.6 pF 44 V CMRR Common Mode Rejection Ratio (Note 6) VCM = 0V to VCC – 1V VCM = 0V to 44V ● ● 84 80 98 98 AVOL Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 200 133 100 1500 ● ● V/mV V/mV V/mV VS = 5V, VO = 500mV to 4.5V, RL = 10k 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 400 250 200 1500 ● ● V/mV V/mV V/mV VS = 3V, No Load VS = 3V, ISINK = 5mA ● ● 3 250 10 450 mV mV VS = 5V, No Load VS = 5V, ISINK = 5mA VS = 5V, ISINK = 10mA ● ● 3 250 330 10 500 500 mV mV mV VS = 3V, No Load VS = 3V, ISOURCE = 5mA ● ● 2.95 2.55 2.978 2.6 V V VS = 5V, No Load VS = 5V, ISOURCE = 10mA ● ● 4.95 4.30 4.978 4.6 V V VOL VOH ISC Output Voltage Swing Low Output Voltage Swing High Short-Circuit Current (Note 2) dB dB VS = 3V, Short to GND VS = 3V, Short to VCC 10 10 15 30 mA mA VS = 5V, Short to GND VS = 5V, Short to VCC 15 15 25 30 mA mA sn1490, 14901afbs 3 LT1490A/LT1491A ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range of – 40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise noted. (Note 4) SYMBOL PSRR PARAMETER CONDITIONS Power Supply Rejection Ratio VS = 2.5V to 12.5V, VCM = VO = 1V ● 84 ● Minimum Operating Supply Voltage Reverse Supply Voltage LT1490AC/LT1491AC LT1490AI/LT1491AI MIN TYP MAX IS = – 100µA per Amplifier ● 98 2 18 UNITS dB 2.5 V 50 55 µA µA 27 Supply Current per Amplifier (Note 7) GBW Gain Bandwidth Product (Note 6) f = 1kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 110 100 90 180 ● ● kHz kHz kHz Slew Rate (Note 8) AV = – 1, RL = ∞ 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 0.035 0.031 0.030 0.06 ● ● V/µs V/µs V/µs SR 40 V IS ● The ● denotes specifications which apply over the full operating temperature range of – 40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V; VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage (Note 5) LT1490A N, S Packages 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C Input Offset Voltage Drift (Note 9) LT1490AC/LT1491AC LT1490AI/LT1491AI MIN TYP MAX UNITS 150 700 950 1100 µV µV µV LT1490A MS8 Package, LT1491A N, S Packages 0°C ≤ TA ≤ 70°C ● – 40°C ≤ TA ≤ 85°C ● 250 1200 1350 1500 µV µV µV LT1490A DD, LT1491A DHC 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 285 1400 1550 1700 µV µV µV 2 2 6 7 ● ● ● ● – 40°C ≤ TA ≤ 85°C ● LT1490A DD, LT1491A DHC, – 40°C ≤ TA ≤ 85°C ● µV/°C µV/°C IOS Input Offset Current ● 0.2 0.8 nA IB Input Bias Current ● 1 8 nA ● 5 Input Bias Current Drift – 40°C ≤ TA ≤ 85°C pA/°C Input Noise Voltage 0.1Hz to 10Hz 1 µVP-P en Input Noise Voltage Density f = 1kHz 50 nV/√Hz in Input Noise Current Density f = 1kHz 0.015 pA/√Hz RIN Input Resistance Differential Common Mode, VCM = – 15V to 14V 17 15000 MΩ MΩ CIN Input Capacitance 6 4.6 Input Voltage Range ● – 15 pF 29 V CMRR Common Mode Rejection Ratio VCM = – 15V to 29V ● 80 98 dB AVOL Large-Signal Voltage Gain VO = ±14V, RL = 10k 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C 100 75 50 250 ● ● V/mV V/mV V/mV VO Output Voltage Swing ±14.9 ±14.5 ±14.5 ±14.978 ±14.750 ±14.670 No Load IOUT = ±5mA IOUT = ±10mA ● ● V V V sn1490, 14901afbs 4 LT1490A/LT1491A ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range of – 40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V; VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS LT1490AC/LT1491AC LT1490AI/LT1491AI MIN TYP MAX ISC Short-Circuit Current (Note 2) Short to GND 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● ±20 ±15 ±10 VS = ±1.25V to ±22V ● 88 PSRR Power Supply Rejection Ratio IS Supply Current per Amplifier SR Gain Bandwidth Product Slew Rate f = 1kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C AV = – 1, RL = ∞, VO = ±10V, Measure at VO = ±5V 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C ● ● ● ● mA mA mA 98 50 ● GBW UNITS ±25 dB µA µA 70 85 125 110 100 200 kHz kHz kHz 0.0375 0.07 V/µs 0.0330 0.0300 V/µs V/µs The ● denotes specifications which apply over the full operating temperature range of – 40°C ≤ TA ≤ 125°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS LT1490AH/LT1491AH MIN TYP MAX VOS Input Offset Voltage (Note 5) LT1490AHS8 110 500 2500 µV µV 220 1000 3000 µV µV 3 6 ● LT1490AHMS8, LT1491AHS ● ● Input Offset Voltage Drift (Note 9) IOS IB ● ● 2 1.5 nA µA VCM = 44V (Note 6) ● ● 20 15 nA µA Input Bias Current Input Voltage Range Common Mode Rejection Ratio (Note 6) VCM = 0.3V to VCC –1V VCM = 0.3V to 44V AVOL Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k ● 0.3 ● ● 60 74 200 25 1500 ● V/mV V/MV 400 50 1500 ● V/mV V/mV VS = 5V, VO = 500mV to 4.5V, RL = 10k VOH PSRR Output Voltage Swing Low Output Voltage Swing High Power Supply Rejection Ratio 44 V dB dB VS = 3V, No Load VS = 3V, ISINK = 2.5mA ● ● 15 450 mV mV VS = 5V, No Load VS = 5V, ISINK = 2.5mA ● ● 15 500 mV mV VS = 3V, No Load VS = 3V, ISOURCE = 5mA ● ● 2.925 2.350 V V VS = 5V, No Load VS = 5V, ISOURCE = 10mA ● ● 4.925 4.100 V V VS = 2.5V to 12.5V, VCM = VO = 1V ● 80 dB ● Minimum Operating Supply Voltage Reverse Supply Voltage µV/°C VCM = 44V (Note 6) Input Offset Current CMRR VOL UNITS IS = – 100µA per Amplifier ● 2.5 18 V V sn1490, 14901afbs 5 LT1490A/LT1491A ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range of – 40°C ≤ TA ≤ 125°C. VS = ±15V, VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4) SYMBOL PARAMETER IS Supply Current per Amplifier (Note 7) LT1490AH/LT1491AH MIN TYP MAX CONDITIONS 40 ● GBW SR VOS Gain Bandwidth Product (Note 6) Slew Rate (Note 8) Input Offset Voltage (Note 5) f = 1kHz UNITS µA µA 50 70 110 60 180 ● kHz kHz 0.035 0.015 0.06 ● V/µs V/µs AV = – 1, RL = ∞ LT1490AHS8 150 700 2700 µV µV 250 1200 3200 µV µV 3 7 µV/°C ● LT1490AHMS8, LT1491AHS ● Input Offset Voltage Drift (Note 9) ● IOS Input Offset Current ● 2 nA IB Input Bias Current ● 20 nA Input Voltage Range ● 29 V CMRR Common Mode Rejection Ratio VCM = –14.7V to 29V AVOL Large-Signal Voltage Gain VO = ±14V, RL = 10k –14.7 ● 72 ● 100 4 dB 250 V/mV V/mV VO Output Voltage Swing No Load IOUT = ±2.5mA ● ● ±14.8 ±14.3 mV mV PSRR Power Supply Rejection Ratio VS = ±1.25V to ±22V ● 84 dB IS Supply Current per Amplifier 50 ● GBW SR Gain Bandwidth Product Slew Rate f = 1kHz µA µA 125 75 200 ● kHz kHz 0.0375 0.02 0.07 ● V/µs V/µs AV = – 1, RL = ∞ Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. This depends on the power supply voltage and how many amplifiers are shorted. The θJA specified for the DD and DHC package is with minimal PCB heat spreading metal. Using expanded metal area on all layers of a board reduces this value. Note 3: The LT1490AC/LT1491AC and LT1490AI/LT1491AI are guaranteed functional over the operating temperature range of – 40°C to 85°C. The LT1490AH/LT1491AH are guaranteed functional over the operating temperature range of – 40°C to 125°C. Note 4: The LT1490AC/LT1491AC are guaranteed to meet specified performance from 0°C to 70°C. The LT1490AC/LT1491AC are designed, characterized and expected to meet specified performance from – 40°C to 85°C but are not tested or QA sampled at these temperatures. The 70 95 LT1490AI/LT1491AI are guaranteed to meet specified performance from –40°C to 85°C. The LT1490AH/LT1491AH are guaranteed to meet specified performance from – 40°C to 125°C. Note 5: ESD (Electrostatic Discharge) sensitive device. Extensive use of ESD protection devices are used internal to the LT1490A/LT1491A. However, high electrostatic discharge can damage or degrade the device. Use proper ESD handling precautions. Note 6: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = ±15V tests. Note 7: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = ±15V tests. Note 8: Guaranteed by correlation to slew rate at VS = ±15V and GBW at VS = 3V and VS = ±15V tests. Note 9: This parameter is not 100% tested. sn1490, 14901afbs 6 LT1490A/LT1491A U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage TA = 125°C 60 TA = 25°C 50 40 TA = –55°C 30 20 10 0 5 0 10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V) 400 5000 300 3000 200 100 TA = –55°C TA = 25°C 0 –100 –200 –300 – 400 45 VS = 5V, 0V INPUT BIAS CURRENT (nA) CHANGE IN INPUT OFFSET VOLTAGE (µV) SUPPLY CURRENT PER AMPLIFIER (µA) 80 70 Input Bias Current vs Common Mode Voltage Minimum Supply Voltage TA = –55°C 10µ 1m 10m 100µ SOURCING LOAD CURRENT (A) 100 TA = 25°C TA = –55°C 10m 2 1µ 10µ 100µ 1m 10m SINKING LOAD CURRENT (A) 7 8 60 50 40 30 9 10 1490A G07 OUTPUT HIGH 20 10 OUTPUT LOW 0 10 30 40 20 INPUT OVERDRIVE (mV) 50 1490A G06 1490A G05 Input Noise Current vs Frequency 0.35 INPUT NOISE CURRENT DENSITY (pA/√Hz) INPUT NOISE VOLTAGE DENSITY (nV/√Hz) 4 5 6 TIME (SEC) 70 100m 120 3 80 Noise Voltage Density vs Frequency NOISE VOLTAGE (400nV/DIV) 1 VS = 5V, 0V 90 NO LOAD 0 1490A G04 0.1Hz to 10Hz Noise Voltage 44 Output Saturation Voltage vs Input Overdrive TA = 125°C 1m 0.1µ 100m VS = ±2.5V 0 4.0 4.4 4.8 5.2 5.6 COMMON MODE VOLTAGE (V) 1490A G03 OUTPUT SATURATION VOLTAGE (mV) OUTPUT SATURATION VOLTAGE (V) OUTPUT SATURATION VOLTAGE (V) TA = 25°C 0 –0.4 5 VS = 5V, 0V 100m 100m TA = 125°C 10 –10 1 3 4 2 TOTAL SUPPLY VOLTAGE (V) 0 1 TA = 125°C TA = 25°C 20 Output Saturation Voltage vs Load Current (Output Low) VS = 5V, 0V 1µ 30 1490A G02 Output Saturation Voltage vs Load Current (Output High) 10m TA = –55°C 0 TA = 125°C 1490A G01 1 1000 100 80 60 40 0.30 0.25 0.20 0.15 0.10 0.05 0 20 1 10 100 FREQUENCY (Hz) 1k 1490A G08 1 10 100 FREQUENCY (Hz) 1k 1490A G09 sn1490, 14901afbs 7 LT1490A/LT1491A U W TYPICAL PERFOR A CE CHARACTERISTICS Gain and Phase Shift vs Frequency Gain Bandwidth Product vs Temperature 40 30 20 20 0 GAIN 10 –20 0 – 40 –10 – 60 –20 – 80 10 100 FREQUENCY (kHz) 200 VS = ±15V 180 VS = ±1.5V 160 50 25 0 75 TEMPERATURE (°C) 40 200 30 180 170 20 RL = 10k f = 1kHz 160 COMMON MODE REJECTION RATIO (dB) 220 PHASE MARGIN (DEG) GAIN BANDWIDTH PRODUCT (kHz) 50 GAIN BANDWIDTH 0 5 10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V) 100 VS = ±15V 80 VS = ±1.5V 60 40 10 FREQUENCY (kHz) PHASE MARGIN 250 40 30 20 NEGATIVE SUPPLY 10 0 –10 1 10 FREQUENCY (kHz) 100 1490A G15 Output Impedance vs Frequency 10k VS = ±15V VS = ± 2.5V 120 70 60 50 200 POSITIVE SUPPLY 50 100 GAIN BANDWIDTH 150 40 100 30 110 OUTPUT IMPEDANCE (Ω) 300 130 CHANNEL SEPARATION (dB) VS = ± 2.5V AV = –1 RF = RG = 100k f = 1kHz 60 Channel Separation vs Frequency 80 PHASE MARGIN (DEG) GAIN BANDWIDTH PRODUCT (kHz) 350 VS = ±2.5V 70 1490A G14 1490A G13 Gain Bandwidth Product and Phase Margin vs Load Resistance 125 –20 1 45 100 PSRR vs Frequency 80 20 10 150 50 25 0 75 TEMPERATURE (°C) 1490A G12 120 240 190 0.04 –50 –25 125 100 CMRR vs Frequency 210 FALLING, VS = ±1.5V 1490A G11 60 230 FALLING, VS = ±15V 120 Gain Bandwidth Product and Phase Margin vs Supply Voltage PHASE MARGIN RISING, VS = ±1.5V 0.08 0.06 140 1490A G10 250 RISING, VS = ±15V 0.10 220 100 –50 –25 –100 1000 –30 1 f = 1kHz PHASE SHIFT (DEG) GAIN (dB) 240 60 PHASE 40 80 POWER SUPPLY REJECTION RATIO (dB) 50 100 Slew Rate vs Temperature 0.12 SLEW RATE (V/µs) VS = ±2.5V GAIN BANDWIDTH PRODUCT (kHz) 70 60 260 100 90 80 70 60 1k AV = 100 100 AV = 10 10 1 AV = 1 50 50 1 10 LOAD RESISTANCE (kΩ) 20 100 1490A G16 40 0.1 1 10 FREQUENCY (kHz) 100 1490A G17 0.1 0.1 1 10 FREQUENCY (kHz) 100 1490A G18 sn1490, 14901afbs 8 LT1490A/LT1491A U W TYPICAL PERFOR A CE CHARACTERISTICS Undistorted Output Swing vs Frequency 35 10 0 –2 –4 40 AV = 1 AV = 2 AV = 10 AV = 5 30 20 40 60 80 100 120 140 160 SETTLING TIME (µs) 10 100 1000 CAPACITIVE LOAD (pF) 10000 1490A G19 1490A F20 1490A G21 Total Harmonic Distortion + Noise vs Frequency Total Harmonic Distortion + Noise vs Load Resistance Total Harmonic Distortion + Noise vs Output Voltage 0.01 1 RL = 10k VCM = HALF SUPPLY f = 1kHz 1 VS = ±1.5V VIN = ±1V 0.1 VS = 3V, 0V VIN = 0.5V TO 2.5V AV = –1 VS = ±1.5V 0.1 10 0.001 0.1 0.001 10 1 LOAD RESISTANCE TO GROUND (kΩ) 1490A G22 Open-Loop Gain AV = –1 VS = 3V, 0V AV = 1 VS = 3V, 0V VS = 3V, 0V VIN = 0.2V TO 2.2V AV = 1 1 0.1 FREQUENCY (kHz) AV = 1 VS = ±1.5V 0.01 0.01 AV = –1 0.001 0.01 10 VS = 3V TOTAL AV = 1 VIN = 2VP-P AT 1kHz THD + NOISE (%) 10 VS = 3V, 0V VOUT = 2VP-P VCM = 1.2V RL = 50k 0.1 CHANGE IN INPUT OFFSET VOLTAGE (100µV/DIV) 50 0 0 100 60 10 AV = 1 –10 1 10 FREQUENCY (kHz) 70 20 AV = –1 –8 THD + NOISE (%) 1 2 –6 VS = 5V, 0V 0 0.1 10 80 AV = 1 4 VS = 5V, 0V ISOURCE = 170µA 90 OVERSHOOT (%) OUTPUT STEP (V) OUTPUT SWING (VP-P) 15 100 AV = –1 6 20 Capacitive Load Handling, Overshoot vs Capacitive Load VS = ±15V 8 25 5 THD + NOISE (%) 10 DISTORTION ≤1% VS = ±15V 30 Settling Time to 0.1% vs Output Step 100 0 2 1 OUTPUT VOLTAGE (VP-P) 1490A G24 1490A G23 Large-Signal Response 3 Small-Signal Response VS = ±15V RL = 2k RL = 10k RL = 50k –10V 0V 10V OUTPUT VOLTAGE (5V/DIV) 1490A G25 VS = ±15V AV = –1 1490A G26 VS = ±15V AV = 1 1490A G27 sn1490, 14901afbs 9 LT1490A/LT1491A U W U U APPLICATIO S I FOR ATIO Supply Voltage The positive supply pin of the LT1490A/LT1491A should be bypassed with a small capacitor (about 0.01µF) within an inch of the pin. When driving heavy loads an additional 4.7µF electrolytic capacitor should be used. When using split supplies, the same is true for the negative supply pin. The LT1490A/LT1491A are protected against reverse battery voltages up to 18V. In the event a reverse battery condition occurs, the supply current is less than 1nA. The LT1490A/LT1491A can be shut down by removing V +. In this condition the input bias current is typically less than 0.5nA, even if the inputs are 44V above the negative supply. When operating the LT1490A/LT1491A on total supplies of 20V or more, the supply must not rise to its final voltage in less than 1µs. This is especially true if low ESR bypass capacitors are used. A series RLC circuit is formed from the supply lead inductance and the bypass capacitor. A resistance of 7.5Ω in the supply or in the bypass capacitor will dampen the tuned circuit enough to limit the rise time. Inputs The LT1490A/LT1491A have two input stages, NPN and PNP (see the Simplified Schematic), resulting in three distinct operating regions as shown in the Input Bias Current vs Common Mode typical performance curve. For input voltages about 0.8V or more below V +, the PNP input stage is active and the input bias current is typically – 1nA. When the input voltage is about 0.5V or less from V +, the NPN input stage is operating and the input bias current is typically 25nA. Increases in temperature will cause the voltage at which operation switches from the PNP stage to the NPN stage to move towards V +. The input offset voltage of the NPN stage is untrimmed and is typically 600µV. A Schottky diode in the collector of each NPN transistor of the NPN input stage allows the LT1490A/LT1491A to operate with either or both of their inputs above V +. At about 0.3V above V + the NPN input transistor is fully saturated and the input bias current is typically 3µA at room temperature. The input offset voltage is typically 700µV when operating above V +. The LT1490A/LT1491A will operate with their inputs 44V above V – regardless of V +. The inputs are protected against excursions as much as 15V below V – by an internal 1k resistor in series with each input and a diode from the input to the negative supply. There is no output phase reversal for inputs up to 15V below V –. There are no clamping diodes between the inputs and the maximum differential input voltage is 44V. Output The output voltage swing of the LT1490A/LT1491A is affected by input overdrive as shown in the typical performance curves. The output of the LT1490A/LT1491A can be pulled up to 18V beyond V + with less than 1nA of leakage current, provided that V + is less than 0.5V. The normally reverse-biased substrate diode from the output to V – will cause unlimited currents to flow when the output is forced below V –. If the current is transient and limited to 100mA, no damage will occur. The LT1490A/LT1491A are internally compensated to drive at least 200pF 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 of distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by nonlinear common mode rejection. Of course, if the op amp is operating inverting there is no common mode induced distortion. When the LT1490A/LT1491A switch 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 LT1490A/ LT1491A should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V + – 0.8V). See the Typical Performance Characteristics curves. sn1490, 14901afbs 10 LT1490A/LT1491A U W U U APPLICATIO S I FOR ATIO Gain in single supply applications where the load is returned to ground. The typical performance photo of Open-Loop Gain for various loads shows the details. The open-loop gain is almost independent of load when the output is sourcing current. This optimizes performance U TYPICAL APPLICATIO S Square Wave Oscillator Optional Output Compensation for Capacitive Loads Greater Than 200pF 59k 5V 100k + 1/2 LT1490A 100k + VIN 1/2 LT1490A VOUT CL ≤ 10,000pF – – R 50k C 0.1µF 1490A TA02 0.22µF 150Ω f= 1 2RC VOUT = 5VP-P WITH 5V SUPPLY IS = 200µA 1490A TA04 AT VS = 5V, R = 50k, C = 1nF OUTPUT IS 5kHz SLEW LIMITED TRIANGLE WAVE W W SI PLIFIED SCHE ATIC V+ Q2 Q1 D1 R1 30k Q3 Q22 D3 D2 R2 1k Q4 Q19 – IN Q17 Q7 R3 1k + Q8 Q11 OUT Q16 +IN 2µA Q18 Q15 Q9 Q5 Q20 Q12 Q6 D4 D5 Q10 Q13 Q14 R4 40k Q21 R5 40k V– ONE AMPLIFIER 1490A SS sn1490, 14901afbs 11 LT1490A/LT1491A U PACKAGE DESCRIPTIO DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) R = 0.115 TYP 5 0.38 ± 0.10 8 0.675 ±0.05 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 1.65 ± 0.10 (2 SIDES) 3.00 ±0.10 (4 SIDES) PIN 1 TOP MARK (NOTE 6) PACKAGE OUTLINE (DD8) DFN 1203 0.25 ± 0.05 4 0.25 ± 0.05 0.75 ±0.05 0.200 REF 0.50 BSC 2.38 ±0.05 (2 SIDES) 1 0.50 BSC 2.38 ±0.10 (2 SIDES) 0.00 – 0.05 BOTTOM VIEW—EXPOSED PAD RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 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 TOP AND BOTTOM OF PACKAGE MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.2 – 3.45 (.126 – .136) 0.42 ± 0.04 (.0165 ± .0015) TYP 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.65 (.0256) BSC 8 7 6 5 0.52 (.206) REF RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 ± 0.102 (.118 ± .004) NOTE 4 4.90 ± 0.15 (1.93 ± .006) DETAIL “A” 0° – 6° TYP GAUGE PLANE 0.53 ± 0.015 (.021 ± .006) DETAIL “A” 1 2 3 4 1.10 (.043) MAX 0.86 (.034) REF 0.18 (.077) SEATING PLANE 0.22 – 0.38 (.009 – .015) TYP 0.65 (.0256) BSC 0.13 ± 0.076 (.005 ± .003) MSOP (MS8) 0802 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 sn1490, 14901afbs 12 LT1490A/LT1491A U PACKAGE DESCRIPTIO N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .300 – .325 (7.620 – 8.255) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) ) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 .100 (2.54) BSC (0.457 ± 0.076) N8 1002 NOTE: 1. DIMENSIONS ARE INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) 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) 0°– 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN .053 – .069 (1.346 – 1.752) .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) 2 3 4 .004 – .010 (0.101 – 0.254) .050 (1.270) BSC SO8 0303 sn1490, 14901afbs 13 LT1490A/LT1491A U PACKAGE DESCRIPTIO N Package 14-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .770* (19.558) MAX 14 13 12 11 10 9 8 1 2 3 4 5 6 7 .255 ± .015* (6.477 ± 0.381) .130 ± .005 (3.302 ± 0.127) .300 – .325 (7.620 – 8.255) .045 – .065 (1.143 – 1.651) .020 (0.508) MIN .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 ) .005 (0.127) .100 MIN (2.54) BSC .120 (3.048) MIN NOTE: 1. DIMENSIONS ARE .018 ± .003 (0.457 ± 0.076) N14 1103 INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) S Package 14-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .337 – .344 (8.560 – 8.738) NOTE 3 .045 ±.005 .050 BSC 14 N 12 11 10 9 8 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 13 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 2 3 4 5 .053 – .069 (1.346 – 1.752) NOTE: 1. DIMENSIONS IN .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) 7 .004 – .010 (0.101 – 0.254) 0° – 8° TYP .016 – .050 (0.406 – 1.270) 6 .050 (1.270) BSC S14 0502 sn1490, 14901afbs 14 LT1490A/LT1491A U PACKAGE DESCRIPTIO DHC Package 16-Lead Plastic DFN (5mm × 3mm) (Reference LTC DWG # 05-08-1706) 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 R = 0.115 TYP 5.00 ±0.10 (2 SIDES) R = 0.20 TYP 3.00 ±0.10 (2 SIDES) 9 0.40 ± 0.10 16 1.65 ± 0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) PIN 1 NOTCH (DHC16) DFN 1103 8 0.200 REF 1 0.25 ± 0.05 0.50 BSC 0.75 ±0.05 4.40 ±0.10 (2 SIDES) 0.00 – 0.05 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 sn1490, 14901afbs 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 LT1490A/LT1491A U TYPICAL APPLICATIO Ring-Tone Generator 60V R16 100k R2 47k R3 10k C2 0.47µF 3 + R1 1/4 LT1491A 33k 2 1 D1 1N4148 R5 100k 5 – 7 R9 300k R11 10k 10 C4 0.068µF 9 + 8 13 – R4 1.6M R8 620k CADENCE OSCILLATOR R10 620k R12 SMOOTHING FILTER 10k R14 10k R13 130k R15 47k 20Hz OSCILLATOR C5 0.01µF 4 – 1/4 LT1491A 12 C1 1µF + R24 11 420 14 C7 47µF R18 100Ω R26 2k R23 4.7k OPTO1* R25 4.7k Q5 2N3904 Z2 15V *LED OF OPTO1 ILLUMINATES WHEN THE PHONE IS OFF THE HOOK SEE DESIGN NOTE DN134 FOR A DISCUSSION OF THE CIRCUIT R17 620Ω Z1 15V 100k 1/4 LT1491A R7 16k – Q3 2N3904 C3 0.047µF + 1/4 LT1491A 6 Q1 IRF628 R6 10k R19 620Ω UP TO LOAD TEN PHONES Q4 2N3906 Q2 IRF9620 R21 150Ω C6 0.033µF POWER AMPLIFIER –180V R20 100k 1490A TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1366/LT1367 Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps 475µV VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW LT1636 Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp 55µA Supply Current, VCM Extends 44V above VEE, Independent of VCC, MSOP Package, Shutdown Function LT1638/LT1639 Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps 0.4V/µs Slew Rate, 230µA Supply Current per Amplifier LT1782 Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and Output Op Amp SOT-23, 800µV VOS(MAX), IS =55µA (Max), Gain-Bandwidth = 200kHz, Shutdown Pin LT1783 1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and Output Op Amp SOT-23, 800µV VOS(MAX), IS =300µA (Max), Gain-Bandwidth = 1.2MHz, Shutdown Pin sn1490, 14901afbs 16 Linear Technology Corporation LT/TP 0105 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 2000