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LT1169CS8 Datasheet(PDF) 10 Page - Linear Technology |
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LT1169CS8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LT1169 S APPLICATI I FOR ATIO Input offset current = 3pA Input resistance = 1013 Ω Input noise = 3.4 µVP-P High Speed Operation The low noise performance of the LT1169 was achieved by enlarging the input JFET differential pair to maximize the first stage gain. Enlarging the JFET geometry also increases the parasitic gate capacitance, which if left unchecked, can result in increased overshoot and ringing. When the feed- back 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 capacitance (CIN = 1.5pF). In closed-loop gain configurations with RS and RF in the M Ωrange(Figure6),thispolecancreateexcessphaseshift 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. Light Balance Detection Circuit Unity-Gain Buffer with Extended Load Capacitance Drive Capability TYPICAL APPLICATIONS N Assume CMRRA = 50µV/V or 86dB, and CMRRB = 39µV/V or 88dB, then ∆CMRR = 11µV/V or 99dB; if CMRRB = –39µV/V which is still 88dB, then ∆CMRR = 89µV/V or 81dB By specifying and guaranteeing all of these matching parameters, the LT1169 can significantly improve the performance of matching-dependent circuits. Typical performance of the instrumentation amplifier: Input offset voltage = 0.8mV Input bias current = 4pA Figure 5. Three Op Amp Instrumentation Amplifier LT1169 • F06 OUTPUT RF RS CS CIN CF Figure 6 4 2 3 OUTPUT C1 30pF R7 10k R6 10k LT1169 • F05 GAIN = BANDWIDTH = INPUT REFERRED NOISE = WIDEBAND NOISE DC TO 330kHz = CL ≤ 100 330kHz 8.7nV/ √Hz AT 1kHz 5.3 µVRMS 0.01 µF IN– 15V 8 1 –15V – + 1/2 LT1169 IC1 1/2 LT1169 IC1 IN+ R3 1k R2 200 Ω R1 1k 7 6 5 R4 1k 1 2 CL 3 1/2 LT1169 IC2 R5 1k LT1169 • TA03 VOUT 1/2 LT1169 C1 VIN R2 1k CL R1 33 Ω C1 = CL ≤ 0.1µF OUTPUT SHORT CIRCUIT CURRENT ( ∼ 30mA) WILL LIMIT THE RATE AT WHICH THE VOLTAGE CAN CHANGE ACROSS LARGE CAPACITORS (I = C dV ) dt LT1169 • TA04 VOUT = 1M × (I1 – I2) PD1,PD2 = HAMAMATSU S1336-5BK WHEN EQUAL LIGHT ENTERS PHOTODIODES, VOUT < 3mV. 1/2 LT1169 R1 1M C1 3pF TO 5pF PD1 PD2 I1 I2 VOUT |
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