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LT1466LCS8 Datasheet(PDF) 9 Page - Linear Technology |
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LT1466LCS8 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LT1466L/LT1467L APPLICATIONS INFORMATION I1 then flows through Q5 to the current mirror D3-Q6, furnishing the tail current for the NPN differential pair Q3-Q4. The switchover point between stages occurs when VCM is equal to the base voltage of Q5, which is biased approximately 1.3V below the positive supply. The collector currents of the two input pairs are combined in the second stage, consisting of Q7-Q11. Most of the voltage gain in the amplifier is contained in this stage. The output of the second stage is buffered and applied to the output devices Q12 and Q13. Capacitors C1 and C2 form local feedback loops around the output devices, lowering the output impedance at high frequencies. Capacitor CC sets the amplifier bandwidth. Input Offset Voltage Since the amplifier has two input stages, the input offset voltage changes depending upon which stage is active. When the amplifier switches between stages, the offset voltage may go up, down or remain flat. Both stages of the LT1466L/LT1467L are trimmed; one at the negative sup- ply and the other at the positive supply. The resulting common mode rejection ratio of 83dB minimum is much better than typical rail-to-rail amplifiers. Overdrive Protection The LT1466L/LT1467L contain circuits that prevent the output from reversing polarity when the input voltage exceeds either supply. For these circuits to work properly, the input current should be limited to –10mA when the input is below the negative supply, and 0.5mA when the input is above the positive supply. If the amplifier is to be severely overdriven, an external resistor should be used to limit the current. Output The output voltage swing and current sinking capability of the LT1466L/LT1467L are affected by input overdrive as shown in the Typical Performance Characteristics. When monitoring voltages within 100mV of either rail, gain should be taken to keep the output from clipping. |
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