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LT1007AMH Datasheet(PDF) 11 Page - Linear Technology |
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LT1007AMH Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  11 LT1007/LT1037 The LT1007/LT1037 achieve their low noise, in part, by operating the input stage at 120 µA versus the typical 10µA of most other op amps. Voltage noise is inversely propor- tional while current noise is directly proportional to the square root of the input stage current. Therefore, the LT1007/LT1037’s current noise will be relatively high. At low frequencies, the low 1/f current noise corner fre- quency ( ≈120Hz) minimizes current noise to some extent. In most practical applications, however, current noise will not limit system performance. This is illustrated in the Total Noise vs Source Resistance plot in the Typical Performance Characteristics section, where: Total Noise = [(voltage noise)2 + (current noise • RS) 2 + (resistor noise)2]1/2 Three regions can be identified as a function of source resistance: (i) RS ≤ 400Ω. Voltage noise dominates (ii) 400 Ω ≤ RS ≤ 50k at 1kHz 400 Ω ≤ RS ≤ 8k at 10Hz (iii) RS > 50k at 1kHz RS > 8k at 10Hz Clearly the LT1007/LT1037 should not be used in region (iii), where total system noise is at least six times higher than the voltage noise of the op amp, i.e., the low voltage noise specification is completely wasted. TYPICAL APPLICATIONS 1007/37 TA03 365 Ω 1% 15k 5% 20k TRIM LT1037 2 15V –15V INPUT 3 7 6 4 OUTPUT RN60C FILM RESISTORS 340k 1% THE HIGH GAIN AND WIDE BANDWIDTH OF THE LT1037 (AND LT1007) 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 LT1037’S “GAIN PRECISION-BANDWIDTH PRODUCT” IS 200 TIMES HIGHER AS SHOWN. FREQUENCY (Hz) 0.1 0.001 0.01 0.1 1 1 10 100 TYPICAL PRECISION OP AMP LT1007 LT1037 GAIN ERROR = CLOSED-LOOP GAIN OPEN-LOOP GAIN Gain 1000 Amplifier with 0.01% Accuracy, DC to 5Hz Gain Error vs Frequency Closed-Loop Gain = 1000 } Resistor noise dominates } Current noise dominates APPLICATIONS INFORMATION |
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