LT1008 Picoamp Input Current, Microvolt Offset, Low Noise Op Amp UFEATURESDESCRIPTIO ■ Guaranteed Bias Current The LT®1008 is a universal precision operational amplifier T that can be used in practically all precision applications. A = 25°C: 100pA Max T The LT1008 combines for the first time, picoampere bias A = – 55°C to 125°C: 600pA Max ■ Guaranteed Offset Voltage: 120μV Max currents (which are maintained over the full – 55°C to ■ Guaranteed Drift: 1.5μV/°C Max 125°C temperature range), microvolt offset voltage (and ■ Low Noise, 0.1Hz to 10Hz: 0.5μV low drift with time and temperature), low voltage and P-P ■ Guaranteed Low Supply Current: 600μA Max current noise, and low power dissipation. Extremely high ■ Guaranteed CMRR: 114dB Min common mode and power supply rejection ratios, and the ■ Guaranteed PSRR: 114dB Min ability to deliver 5mA load current with high voltage gain ■ Guaranteed Voltage Gain with 5mA Load Current round out the LT1008’s superb precision specifications. ■ Available in 8-Lead PDIP and SO Packages The all around excellence of the LT1008 eliminates the necessity of the time consuming error analysis procedure UAPPLICATIO S of precision system design in many applications; the LT1008 can be stocked as the universal precision op amp. ■ Precision Instrumentation ■ The LT1008 is externally compensated with a single ca- Charge Integrators ■ pacitor for additional flexibility in shaping the frequency Wide Dynamic Range Logarithmic Amplifiers ■ response of the amplifier. It plugs into and upgrades all Light Meters ■ standard LM108A/LM308A applications. For an internally Low Frequency Active Filters ■ compensated version with even lower offset voltage but Standard Cell Buffers ■ otherwise similar performance see the LT1012. Thermocouple Amplifiers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. UTYPICAL APPLICATIOInput Amplifier for 4.5 Digit VoltmeterInput Bias Current vs Temperature 100 1000pF 50 1 15V UNDERCANCELLED UNIT 2 – 8 0.1V INPUT 7 0.1V 1V 100k 6 0 LT1008 OVERCANCELLED UNIT 1V 5% 3 + 10V 9k* 4 100V –50 9M –15V 1000V TO 1V FULL-SCALE 10V 1k* ANALOG-TO-DIGITAL INPUT BIAS CURRENT (pA) 900k CONVERTER –100 100V *RATIO MATCH ±0.01% 90k –150 –50 –25 0 25 50 75 100 125 1000V THIS APPLICATION REQUIRES LOW TEMPERATURE (°C) 10k FN507 BIAS CURRENT AND OFFSET VOLTAGE, 1008 TA02 ALLEN BRADLEY LOW NOISE AND LOW DRIFT WITH DECADE VOLTAGE DIVIDER TIME AND TEMPERATURE 1008 TA01 1008fb 1
