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LT1490A Datasheet(PDF) 1 Page - Linear Technology |
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LT1490A Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1490A Dual Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp s Low Input Offset Voltage: 500 µV Max s Output Swings to 10mV Max from V – s Rail-to-Rail Input and Output s Micropower: 50 µµµµµA/Amplifier Max s MSOP Package s Over-The-Top TM Input Common Mode Range Extends 44V Above V –, Independent of V + s Specified on 3V, 5V and ±15V Supplies s High Output Current: 20mA s Output Drives 10,000pF with Output Compensation s Reverse Battery Protection to 18V s No Supply Sequencing Problems s High Voltage Gain: 1500V/mV s High CMRR: 98dB s No Phase Reversal s Gain Bandwidth Product: 200kHz The LT ®1490A is an enhanced version of the popular LT1490 op amp with improved input offset voltage (500 µV max) and output voltage swing (10mV max from V –). It is recom- mended for all new designs. The LT1490A operates on all single and split supplies with a total voltage of 2V to 44V, drawing only 40 µA of quiescent current per amplifier. It is reverse supply protected; it draws virtually no current for reverse supply up to 18V. The input range of the LT1490A includes both supplies and the output swings to both sup- plies. Unlike most micropower op amps, the LT1490A can drive heavy loads; its rail-to-rail output drives 20mA. The LT1490A is unity-gain stable and drives all capacitive loads up to 10,000pF when optional 0.22 µF and 150Ω compensa- tion is used. The LT1490A has 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. s Battery- or Solar-Powered Systems Portable Instrumentation Sensor Conditioning s Supply Current Sensing s Battery Monitoring s Micropower Active Filters s 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 14901A TA01 LOGIC HIGH (5V) = CHARGING LOGIC LOW (0V) = DISCHARGING RG 10k Q1 2N3904 RS 0.2 Ω CHARGER VOLTAGE 1/2 LT1490A 1/2 LT1490A RA´ 2k RB 2k VBATT = 12V IBATT + RB´ 2k LOAD – + – + VOUT (RS)(RG/RA)(GAIN) VOUT GAIN IBATT = = AMPS 1/2 LT1490A 1/2 LT1490A , LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a trademark of Linear Technology Corporation. DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
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