Datasheet LT2078, LT2079 (Analog Devices)

LT 2078/LT 2079 Micropower, Dual and Quad, Single Supply, Precision Op Amps
U FEATURES FEA DESCRIPTION DESCRIPTIO
■
Supply Current per Amplifier: 50
µ
A Max
The LT ®2078 is a micropower dual op amp in 8-pin small ■
Offset Voltage: 70
µ
V Max
outline, standard surface mount package, and LT2079 is ■ Offset Current: 250pA Max a micropower quad op amp offered in the standard 14-pin ■ Voltage Noise: 0.6µVP-P, 0.1Hz to 10Hz surface mount package. Both devices are optimized for ■ Current Noise: 3pAP-P, 0.1Hz to 10Hz single supply operation at 5V. ±15V specifications are also ■ Offset Voltage Drift: 0.4µV/°C provided. ■ Gain Bandwidth Product: 200kHz Micropower performance of competing devices is achieved ■ Slew Rate: 0.07V/µs at the expense of seriously degrading precision, noise, ■ Single Supply Operation speed and output drive specifications. The design effort of Input Voltage Range Includes Ground the LT2078/LT2079 was concentrated on reducing sup- Output Swings to Ground while Sinking Current ply current without sacrificing other parameters. The No Pull-Down Resistors Needed offset voltage achieved is the lowest on any dual or quad ■ Output Sources and Sinks 5mA Load Current nonchopper stabilized op amp––micropower or other- ■ SO Package with Standard Pinout wise. Offset current, voltage and current noise, slew rate
U
and gain bandwidth product are all two to ten times better
APPLICATIO APPLICA N TIO S
than on previous micropower op amps. ■ Battery or Solar-Powered Systems Both the LT2078/LT2079 can be operated from a single Portable Instrumentation supply (as low as one lithium cell or two NiCd batteries). Remote Sensor Amplifier The input range goes below ground. The all NPN output Satellite Circuitry stage swings to within a few millivolts of ground while ■ Micropower Sample-and-Hold sinking current––no power consuming pull-down resis- ■ Thermocouple Amplifier tors are needed. For applications requiring DIP packages ■ Micropower Filters refer to the LT1078/LT1079. , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATIO TYPICAL APPLICA N TIO Single Battery, Micropower, Gain = 100, Instrumentation Amplifier Distribution of Input Offset Voltage
10.1k 1M 800 VS = 5V, 0V 700 5000 OP AMPS 3V 1M 2 – (Li-Ion) 600 A 1 10.1k 6 – 8 1/2 LT2078 B 500 INVERTING 3 + 7 OUT –INPUT 1/2 LT2078 NONINVERTING 5 + 400 +INPUT 4 LT2078/79 • TA01 300 NUMBER OF OP AMPS TYPICAL PERFORMANCE OUTPUT NOISE = 85µV 200 P-P 0.1Hz TO 10Hz INPUT OFFSET VOLTAGE = 40µV = 300µVRMS OVER FULL BANDWIDTH INPUT OFFSET CURRENT = 0.2nA INPUT RANGE = 0.03V TO 1.8V 100 TOTAL POWER DISSIPATION = 240µW OUTPUT RANGE = 0.03V TO 2.3V COMMON MODE REJECTION = 110dB (AMPLIFIER LIMITED) (0.3mV ≤ VIN+ – VIN– ≤ 23mV) 0 GAIN BANDWIDTH PRODUCT = 200kHz OUTPUTS SINK CURRENT—NO PULL-DOWN RESISTORS –120 –80 –40 0 40 80 120 INPUT OFFSET VOLTAGE (µV) 2078/79 • TA02 20789fa 1