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LT1792ACN8 Datasheet(PDF) 10 Page - Linear Technology |
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LT1792ACN8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LT1792 S APPLICATI I FOR ATIO also increases the parasitic gate capacitance, which if left unchecked, can result in increased overshoot and ring- ing. When the feedback around the op amp is resistive (RF), a pole will be created with RF, the source resistance and capacitance (RS, CS), and the amplifier input capaci- tance (CIN = 27pF). In low gain configurations and with RS and RF in the kilohm range (Figure 5), this pole can create excess phase shift and even oscillation. A small capacitor (CF) in parallel with RF eliminates this problem. With RS(CS + CIN) = RFCF, the effect of the feedback pole is completely removed. Figure 5 1792 F05 OUTPUT RF RS CS CF CIN 1792 TA06 VOUT TYPICAL OFFSET ≈ 0.8mV 1% TOLERANCES FOR VIN = 10VP-P, VOUT = –121dB AT f > 330Hz = – 6dB AT f = 16.3Hz LOWER RESISTOR VALUES WILL RESULT IN LOWER THERMAL NOISE AND LARGER CAPACITORS R3 249k C2 100nF C1 33nF R1 237k VIN R2 237k R6 249k C4 330nF 3 2 LT1792 6 C3 10nF R4 154k R5 154k 7 15V –15V 4 6 3 2 LT1792 10Hz Fourth Order Chebyshev Lowpass Filter (0.01dB Ripple) S APPLICATI TYPICAL Accelerometer Amplifier with DC Servo 7 5V TO 15V – 5V TO –15V 4 1792 TA03 OUTPUT R1 100M C1 1250pF R3 2k C3 2 µF R2 18k C2 2 µF 2 3 R4 20M LT1792 6 R5 20M ACCELEROMETER B & K MODEL 4381 OR EQUIVALENT 6 3 2 LT1792 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 |
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