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LT1124AM Datasheet(PDF) 10 Page - Linear Technology |
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LT1124AM Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page 10 LT1124/LT1125 S APPLICATI TYPICAL Gain 1000 Amplifier with 0.01% Accuracy, DC to 1Hz Gain Error vs Frequency Closed-Loop Gain = 1000 – + OUTPUT 1124/25 TA03 365 Ω 1% INPUT 15k 5% 340k 1% 20k TRIM 15V 1/2 LT1124 –15V RN60C FILM RESISTORS THE HIGH GAIN AND WIDE BANDWIDTH OF THE LT1124/LT1125, IS USEFUL IN LOW FREQUENCY HIGH CLOSED-LOOP GAIN AMPLIFIER APPLICATIONS. A TYPICAL PRECISION OP AMP MAY HAVE AN OPEN-LOOP GAIN OF ONE MILLION WITH 500kHz BANDWIDTH. AS THE GAIN ERROR PLOT SHOWS, THIS DEVICE IS CAPABLE OF 0.1% AMPLIFYING ACCURACY UP TO 0.3Hz ONLY. EVEN INSTRUMENTATION RANGE SIGNALS CAN VARY AT A FASTER RATE. THE LT1124/LT1125 “GAIN PRECISION — BANDWIDTH PRODUCT” IS 75 TIMES HIGHER, AS SHOWN. 4 7 (SO-8) 1 (N8) 6 (S0-8) 8 (N8) 3 2 FREQUENCY (Hz) 0.01 0.1 1.0 0.1 10 100 1124/25 TA04 0.001 1 GAIN ERROR = CLOSED-LOOP GAIN OPEN-LOOP GAIN TYPICAL PRECISION OP AMP LT1124/LT1125 Table 2. Guaranteed Performance, VS = ±15V, TA = 25°C, Low Cost Devices LT1124CN8 PARAMETER/UNITS LT1125CN OP-27 GP OP-270 GP OP-470 GP UNITS Voltage Noise, 1kHz 4.2 4.5 – 5.0 nV/ √Hz 100% Tested Sample Tested No Limit Sample Tested Slew Rate 2.7 1.7 1.7 1.4 V/ µs 100% Tested Not Tested Gain Bandwidth Product 8.0 5.0 – – MHz 100% Tested Not Tested No Limit No Limit Offset Voltage LT1124 100 100 250 – µV LT1125 140 – – 1000 µV Offset Current LT1124 20 75 20 – nA LT1125 30 – – 30 nA Bias Current 30 80 60 60 nA Supply Current/Amp 2.75 5.67 3.25 2.75 mA Voltage Gain, RL = 2k 1.5 0.7 0.35 0.4 V/ µV Common Mode Rejection Ratio 106 100 90 100 dB Power Supply Rejection Ratio 110 94 104 105 dB SO-8 Package Yes - LT1124 Yes No – Table 2 summarizes the performance of the LT1124/ LT1125 compared to the low cost grades of alternate approaches. The comparison shows how the specs of the LT1124/ LT1125 not only stand up to the industry standard OP-27, but in most cases are superior. Normally dual and quad performance is degraded when compared to singles, for the LT1124/LT1125 this is not the case. PERFOR A CE CO PARISO |
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