LT1457 Dual, Precision JFET Input Op Amp UFEATURESDESCRIPTION ■ Handles 10,000pF Capacitive Load The LT1457 is a dual, JFET input op amp optimized for ■ 450µV Max Offset Voltage handling large capacitive loads in combination with preci- ■ 1200µV Max Offset Voltage in S8 Package sion performance. ■ 50pA Bias Current at 70 ° C Precision specifications include 220µV offset voltage in ■ 13nV/√Hz Voltage Noise plastic and surface mount packages. At 70°C input bias ■ 4V/µs Slew Rate current is 50pA, input offset current is 20pA. Channel ■ 4µV/°C Drift separation is 130dB. ■ 130dB Channel Separation Other dual JFET input op amps from Linear Technology U include the LT1057, which is three times faster than the APPLICATIONS LT1457 but at the expense of significantly lower capacitive ■ Sample-and-Hold (Drives Large Hold Capacitors) load handling capability; and the LT1113 with 4.5nV/√Hz ■ A/D and D/A Converters voltage noise. ■ Photodiode Amplifiers ■ Voltage-to-Frequency Converters WUTYPICAL PERFORMANCE CHARACTERISTICSCapacitive Load HandlingInput Offset Voltage DistributionS8 Package 100 21 V 400 DUALS S = ±15V VS = ±15V T (800 OP AMPS) A = 25°C 18 TA = 25°C 80 A TESTED FROM V = +1 3 RUNS 15 60 12 9 40 OVERSHOOT (%) PERCENT OF UNITS 6 20 3 0 0 0.1 1 10 100 –1.0–0.8 –0.6–0.4 –0.2 0 0.2 0.4 0.6 0.8 1.0 CAPACITIVE LOAD (nF) INPUT OFFSET VOLTAGE (mV) LT11457• TA01 LT1457 • TA02 1
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