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LT1792IN8 Datasheet(PDF) 11 Page - Linear Technology |
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LT1792IN8 Datasheet(HTML) 11 Page - Linear Technology |
11 / 12 page 11 LT1792 S APPLICATI TYPICAL Low Noise Light Sensor with DC Servo Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 7 V + V – 4 1792 TA05 R1 1M C1 2pF 6 3 2 LT1792 R2C2 > C1R1 CD = PARASITIC PHOTODIODE CAPACITANCE VO = 100mV/µWATT FOR 200nm WAVE LENGTH 330mV/ µWATT FOR 633nm WAVE LENGTH R5 1k D2 1N914 2N3904 V – R4 1k D1 1N914 R3 1k 6 3 2 LT1792 C2 0.022 µF HAMAMATSU S1336-5BK OUTPUT R2 100k CD 1. ASSUME VOLTAGE NOISE OF LT1792 AND 51 Ω SOURCE RESISTOR = 4.3nV/√Hz 2. GAIN WITH n LT1792s IN PARALLEL = n × 200 3. OUTPUT NOISE = √n × 200 × 4.3nV/√Hz 4. INPUT REFERRED NOISE = OUTPUT NOISE = 4.3 nV/ √H z n × 200 √n 5. NOISE CURRENT AT INPUT INCREASES √n TIMES 7 15V –15V 4 7 15V –15V 4 1k 1792 TA04 6 2 3 1k 1k 6 2 3 – + A2 LT1792 – + 1k 51 Ω 51 Ω 51 Ω 6 2 3 An LT1792 10k 6 3 2 LT1792 – + A1 LT1792 1k 1k OUTPUT Paralleling Amplifiers to Reduce Voltage Noise |
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