Datasheet LT1672, LT1673, LT1674 (Analog Devices)

LT1672/LT1673/LT1674 2µA Max, AV ≥ 5 Single, Dual and Quad Over-The-Top Precision Rail-to-Rail Input and Output Op Amps
U FEATURES DESCRIPTIO
■
Gain of 5 Stable
The LT®1672/LT1673/LT1674 are ultralow power ■
Low Supply Current: 2
µ
A Max per Amplifier
(IS ≤ 2µA) decompensated (AV ≥ 5) op amps with preci- ■
Rail-to-Rail Input and Output
sion specifications. The extremely low supply current is ■
Low Offset Voltage: 375
µ
V Max
combined with excellent amplifier specifications: input ■ Over-The-TopTM Inputs Operate Above V+ offset voltage is 375µV maximum with a typical drift of ■ Gain Bandwidth Product: 12kHz only 0.4µV/°C, input offset current is 100pA maximum. A ■ Wide Supply Range: 2.2V to 36V minimum open-loop gain (AVOL) of 100V/mV ensures that ■ Single Supply Input Range: – 0.3V to 36V gain errors are small. The devices’ characteristics change ■ Low Input Bias Current: 250pA little over the supply range of 2.2V to ±15V. Supply rejection is 90dB and the common mode rejection ratio is ■ Low Input Offset Current: 20pA 90dB. Operation is specified for 3V, 5V and ±15V supplies. ■ High AVOL: 100V/mV Minimum Driving 100kΩ Load Reverse battery protection (–18V min) and inputs that ■ Output Sources and Sinks 500µA Load Current operate above the positive supply make the LT1672/ ■ Reverse Battery Protected to 18V LT1673/LT1674 easy to use in harsh environments.
U APPLICATIO S
The low bias currents and offset current of the amplifier permit the use of megohm level source resistors without ■ Battery- or Solar-Powered Systems introducing significant errors. Voltage noise at 4µVP-P is ■ Portable Instrumentation remarkably low considering the low supply current. For ■ Remote Sensor Amplifier unity gain stable versions of these amplifiers, see the ■ Micropower Filter LT1494/LT1495/LT1496. ■ Photodiode Amplifier The LT1672 is available in the 8-pin MSOP, PDIP and SO ■ High Impedance Circuits packages. The LT1673 is available in plastic 8-pin PDIP and SO-8 packages with the standard dual op amp pinout. , LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a trademark of Linear Technology Corporation. The LT1674 is available in 14-pin PDIP and SO packages.
U TYPICAL APPLICATION TC VOS Distribution Single Supply, 60
µ
W Precision Instrumentation Amplifier
80 120 AMPLIFIERS 5V V 100k* 70 S = ±2.5V – 40°C to 85°C VIN1 + 1M 60 1/2 LT1673 – 50 5V 110k 1M 100k 40 – UNITS 30 LT1672 VOUT 1M 100k 1000pF + 20 110k 1M 10 1M – AV = 100 5V BANDWIDTH = 1kHz 1/2 LT1673 0 100k* 0.0047µF LT1389-2.5 CMRR = 65dB AT 120Hz –1.5 – 0.9 – 0.3 0.3 0.9 1.5 *500V TRANSIENT PROTECTION VIN2 + TC VOS (µV/°C) 1672/3/4 TA01 TOTAL SUPPLY CURRENT = 12µA 1672/3/4 TA02 1