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LT1113 Datasheet(PDF) 13 Page - Linear Technology |
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LT1113 Datasheet(HTML) 13 Page - Linear Technology |
13 / 16 page 13 LT1113 S APPLICATI TYPICAL Accelerometer Amplifier with DC Servo Paralleling Amplifiers to Reduce Voltage Noise 8 5V TO 15V –5V TO –15V 4 1113 • TA03 OUTPUT R1 100M C1 1250pF R3 2k C3 2 µF R2 18k C2 2 µF 6 5 R4 20M 1/2 LT1113 7 R5 20M ACCELEROMETER B & K MODEL 4381 OR EQUIVALENT 1 3 2 1/2 LT1113 R4C2 = R5C3 > R1 (1 + R2/R3) C1 OUTPUT = 0.8mV/pC* = 8.0mV/g** DC OUTPUT ≤ 2.7mV OUTPUT NOISE = 6nV/ √Hz AT 1kHz *PICOCOULOMBS **g = EARTH’S GRAVITATIONAL CONSTANT 1. ASSUME VOLTAGE NOISE OF LT1113 AND 51 Ω SOURCE RESISTOR = 4.6nV/√Hz 2. GAIN WITH n LT1113s IN PARALLEL = n • 200 3. OUTPUT NOISE = √n • 200 • 4.6nV/√Hz 4. INPUT REFERRED NOISE = OUTPUT NOISE = 4.6 nV/ √Hz n • 200 √n 5. NOISE CURRENT AT INPUT INCREASES √n TIMES 6. IF n = 5, GAIN = 1000, BANDWIDTH = 1MHz, RMS NOISE, DC TO 1MHz = 9 µV = 4 µV √5 8 15V –15V 4 8 15V –15V 4 1113 • TA04 1k 7 6 5 1k 1k 1 2 3 – + A2 1/2 LT1113 – + 1k 51 Ω 51 Ω 51 Ω 1 2 3 A1 1/2 LT1113 10k 7 5 6 1/2 LT1113 – + An 1/2 LT1113 1k 1k OUTPUT |
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