Datasheet LT1490A, LT1491A (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps |
| Pages / Page | 18 / 1 — FEATURES. DESCRIPTION. Low Input Offset Voltage: 500μV Max. Output Swings … |
| File Format / Size | PDF / 234 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Low Input Offset Voltage: 500μV Max. Output Swings to 10mV Max from V–. Rail-to-Rail Input and Output
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Text Version of Document
LT1490A/LT1491A Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps
FEATURES DESCRIPTION
n
Low Input Offset Voltage: 500μV Max
The LT®1490A/LT1491A are dual and quad op amps with a n
Output Swings to 10mV Max from V–
low input offset voltage of 500μV max. The LT1490A/LT1491A n
Rail-to-Rail Input and Output
operate on all single and split supplies with a total voltage of n
Micropower: 50μA/Amplifier Max
2V to 44V, drawing only 40μA of quiescent current per ampli- n Over-The-Top® Input Common Mode Range Extends fier. These amplifiers are reverse supply protected; they draw 44V Above V–, Independent of V+ virtually no current for reverse supply up to 18V. The input n Specified on 3V, 5V and ±15V Supplies range of the LT1490A/LT1491A includes both supplies and n High Output Current: 20mA the output swings to both supplies. Unlike most micropower n Output Drives 10,000pF with Output Compensation op amps, the LT1490A/LT1491A can drive heavy loads; their n Reverse Battery Protection to 18V rail-to-rail outputs drive 20mA. The LT1490A/LT1491A are n No Supply Sequencing Problems unity-gain stable and drive all capacitive loads up to 10,000pF n when optional 0.22μF and 150Ω compensation is used. High Voltage Gain: 1500V/mV n High CMRR: 98dB The LT1490A/LT1491A have a unique input stage that oper- n No Phase Reversal ates and remains high impedance when above the positive n Gain Bandwidth Product: 200kHz supply. The inputs take 44V both differential and common n Tiny 3mm × 3mm × 0.8mm DFN Package mode even when operating on a 3V supply. Built-in resistors protect the inputs for faults below the negative supply up to
APPLICATIONS
15V. There is no phase reversal of the output for inputs 15V n below V– or 44V above V–, independent of V+. Battery- or Solar-Powered Systems Portable Instrumentation The LT1490A dual op amp is available in the 8-pin MSOP, PDIP Sensor Conditioning and SO packages. For space limited applications LT1490A is n Supply Current Sensing available in a 3mm × 3mm × 0.8mm, dual fine pitch leadless n Battery Monitoring package (DFN). The quad LT1491A is available in the 14-pin n Micropower Active Filters SO, PDIP and 5mm × 3mm × 0.8mm DFN packages. n 4mA to 20mA Transmitters L, LT, LTC, LTM, Over-The-Top, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5825228.
TYPICAL APPLICATION Battery Monitor
RS RA 0.2Ω 2k Q1 CHARGER + 2N3904 VOLTAGE I R BATT A´ 1/4 LT1491A – 2k – 1/4 LT1491A LOGIC + RB 2k Q2 + 2N3904 LOGIC HIGH (5V) = CHARGING LOGIC LOW (0V) = DISCHARGING RB´ 1/4 LT1491A 2k LOAD – + + RG 1/4 LT1491A VOUT 10k VBATT = 12V – S1 10k 90.9k 1490A TA01 VOUT VOUT S1 = OPEN, GAIN = 1 R I A = RB BATT = = AMPS (R GAIN S1 = CLOSED, GAIN = 10 V S)(RG/RA)(GAIN) S = 5V, 0V 14901afd 1 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS APPLICATIONS INFORMATION TYPICAL APPLICATIONS SIMPLIFIED SCHEMATIC PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
FEATURES DESCRIPTION
n
Low Input Offset Voltage: 500μV Max
The LT®1490A/LT1491A are dual and quad op amps with a n
Output Swings to 10mV Max from V–
low input offset voltage of 500μV max. The LT1490A/LT1491A n
Rail-to-Rail Input and Output
operate on all single and split supplies with a total voltage of n
Micropower: 50μA/Amplifier Max
2V to 44V, drawing only 40μA of quiescent current per ampli- n Over-The-Top® Input Common Mode Range Extends fier. These amplifiers are reverse supply protected; they draw 44V Above V–, Independent of V+ virtually no current for reverse supply up to 18V. The input n Specified on 3V, 5V and ±15V Supplies range of the LT1490A/LT1491A includes both supplies and n High Output Current: 20mA the output swings to both supplies. Unlike most micropower n Output Drives 10,000pF with Output Compensation op amps, the LT1490A/LT1491A can drive heavy loads; their n Reverse Battery Protection to 18V rail-to-rail outputs drive 20mA. The LT1490A/LT1491A are n No Supply Sequencing Problems unity-gain stable and drive all capacitive loads up to 10,000pF n when optional 0.22μF and 150Ω compensation is used. High Voltage Gain: 1500V/mV n High CMRR: 98dB The LT1490A/LT1491A have a unique input stage that oper- n No Phase Reversal ates and remains high impedance when above the positive n Gain Bandwidth Product: 200kHz supply. The inputs take 44V both differential and common n Tiny 3mm × 3mm × 0.8mm DFN Package mode even when operating on a 3V supply. Built-in resistors protect the inputs for faults below the negative supply up to
APPLICATIONS
15V. There is no phase reversal of the output for inputs 15V n below V– or 44V above V–, independent of V+. Battery- or Solar-Powered Systems Portable Instrumentation The LT1490A dual op amp is available in the 8-pin MSOP, PDIP Sensor Conditioning and SO packages. For space limited applications LT1490A is n Supply Current Sensing available in a 3mm × 3mm × 0.8mm, dual fine pitch leadless n Battery Monitoring package (DFN). The quad LT1491A is available in the 14-pin n Micropower Active Filters SO, PDIP and 5mm × 3mm × 0.8mm DFN packages. n 4mA to 20mA Transmitters L, LT, LTC, LTM, Over-The-Top, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5825228.
TYPICAL APPLICATION Battery Monitor
RS RA 0.2Ω 2k Q1 CHARGER + 2N3904 VOLTAGE I R BATT A´ 1/4 LT1491A – 2k – 1/4 LT1491A LOGIC + RB 2k Q2 + 2N3904 LOGIC HIGH (5V) = CHARGING LOGIC LOW (0V) = DISCHARGING RB´ 1/4 LT1491A 2k LOAD – + + RG 1/4 LT1491A VOUT 10k VBATT = 12V – S1 10k 90.9k 1490A TA01 VOUT VOUT S1 = OPEN, GAIN = 1 R I A = RB BATT = = AMPS (R GAIN S1 = CLOSED, GAIN = 10 V S)(RG/RA)(GAIN) S = 5V, 0V 14901afd 1 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS APPLICATIONS INFORMATION TYPICAL APPLICATIONS SIMPLIFIED SCHEMATIC PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
