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LT1490ACN8 数据表(PDF) 1 Page - Linear Technology |
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LT1490ACN8 数据表(HTML) 1 Page - Linear Technology |
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1 / 16 page  1 LT1490A/LT1491A sn1490, 14901afbs Dual/Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps ■ Low Input Offset Voltage: 500 µV Max ■ Output Swings to 10mV Max from V – ■ Rail-to-Rail Input and Output ■ Micropower: 50 µµµµµA/Amplifier Max ■ 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 The LT®1490A/LT1491A are dual and quad op amps with a low input offset voltage of 500 µVmax.TheLT1490A/LT1491A operate on all single and split supplies with a total voltage of 2V to 44V, drawing only 40 µA 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 capaci- tive loads up to 10,000pF when optional 0.22 µF and 150Ω compensation is used. The LT1490A/LT1491A have a unique input stage that oper- ates 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. ■ Battery- or Solar-Powered Systems Portable Instrumentation Sensor Conditioning ■ Supply Current Sensing ■ Battery Monitoring ■ Micropower Active Filters ■ 4mA to 20mA Transmitters Battery Monitor – + – + RA 2k Q2 2N3904 S1 S1 = OPEN, GAIN = 1 S1 = CLOSED, GAIN = 10 RA = RB VS = 5V, 0V 10k 90.9k VOUT LOGIC 1490A TA01 LOGIC HIGH (5V) = CHARGING LOGIC LOW (0V) = DISCHARGING RG 10k Q1 2N3904 RS 0.2 Ω CHARGER VOLTAGE 1/4 LT1491A 1/4 LT1491A RA´ 2k RB 2k VBATT = 12V IBATT + RB´ 2k LOAD – + – + VOUT (RS)(RG/RA)(GAIN) VOUT GAIN IBATT = = AMPS 1/4 LT1491A 1/4 LT1491A , 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. DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
类似零件编号 - LT1490ACN8 |
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类似说明 - LT1490ACN8 |
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