LTC1052

LTC1052/LTC7652 Zero-Drift Operational Amplifier U U FEATURES ■ Guaranteed Max Offset: 5µV ■ Guaranteed Max Offset Drift: 0.05µV/°C ■ Typ Offset Drift: 0.01µV/°C ■ Excellent Long Term Stability: 100nV/√Month ■ Guaranteed Max Input Bias Current: 30pA ■ Over Operating Temperature Range: Guaranteed Min Gain: 120dB Guaranteed Min CMRR: 120dB Guaranteed Min PSRR: 120dB ■ Single Supply Operation: 4.75V to 16V (Input Voltage Range Extends to Ground) ■ External Capacitors can be Returned to V– with No Noise Degradation U APPLICATIO S ■ Thermocouple Amplifiers ■ Strain Gauge Amplifiers ■ Low Level Signal Processing ■ Medical Instrumentation DESCRIPTIO The LTC®1052 and LTC7652 are low noise zero-drift op amps manufactured using Linear Technology’s enhanced LTCMOSTM silicon gate process. Chopper-stabilization constantly corrects offset voltage errors. Both initial offset and changes in the offset due to time, temperature and common mode voltage are corrected. This, coupled with picoampere input currents, gives these amplifiers unmatched performance. Low frequency (1/f) noise is also improved by the chopping technique. Instead of increasing continuously at a 3dB/octave rate, the internal chopping causes noise to decrease at low frequencies. The chopper circuitry is entirely internal and completely transparent to the user. Only two external capacitors are required to alternately sample-and-hold the offset correction voltage and the amplified input signal. Control circuitry is brought o...