精密放大器 LT1218L - Precision Rail-to-Rail Input and Output Op Amp
DESCRIPTION
The LT®1218/LT1219 are bipolar op amps which combine rail-to-rail input and output operation with precision specifications. Unlike other rail-to-rail amplifiers, the LT1218/LT1219’s input offset voltage is a low 90µV across the entire rail-to-rail input range, not just a portion of it. Using a patented technique, both input stages of the LT1218/LT1219 are trimmed: one at the negative supply and the other at the positive supply. The resulting common mode rejection of 97dB minimum is much better than other rail to-rail input op amps. A minimum open-loop gain of 500V/mV into a 10k load virtually eliminates all gain error.
The LT1218 has conventional compensation which assures stability for capacitive loads of 1000pF or less. The LT1219 has compensation that requires the use of a 0.1µF output capacitor, which improves the amplifier’s supply rejection and reduces output impedance at high frequencies. The output capacitor’s filtering action also reduces high frequency noise, which is beneficial when driving A/D converters.
FEATURES
■ Rail-to-Rail Input and Output
■ 90µV VOSMAX for VCM = V– to V+
■ High Common Mode Rejection Ratio: 97dB Min
■ C-LoadTM Stable Version LT1219
■ High AVOL: 500V/mV Minimum Driving 10kΩ Load
■ Wide Supply Range:
2V to ±15V LT1218/LT1219
2V to ±5V LT1218L/LT1219L
■ Shutdown Mode: IS < 30µA
■ Low Supply Current: 420µA Max
■ Low Input Bias Current: 18nA Typical
■ 300kHz Gain-Bandwidth Product LT1218
■ Slew Rate: 0.10V/µs LT1218
APPLICATIONS
■ Driving A/D Converters
■ Test Equipment Amplifiers
■ MUX Amplifiers
