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LT1466LCS8 Datasheet(PDF) 8 Page - Linear Technology |
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LT1466LCS8 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LT1466L/LT1467L Figure 1. Simplified Schematic TYPICAL PERFORMANCE CHARACTERISTICS Q3 D1 CC Q4 Q6 1466L/67L F01 Q1 Q8 Q12 Q13 I1 VBIAS Q2 Q5 –IN +IN V + V + V – V – BUFFER AND OUTPUT BIAS C1 C2 OUT Q7 Q10 Q11 Q9 APPLICATIONS INFORMATION Rail-to-Rail Operation The LT1466L/LT1467L differ from conventional op amps in the design of both the input and output stages. Figure 1 shows a simplified schematic. The input stage consists of two differential amplifiers, a PNP stage Q1-Q2 and an NPN stage Q3-Q4, that are active over different portions of the input common mode range. Each input stage is trimmed for offset voltage. A complementary output configuration (Q12-Q13) is employed to create an output stage with rail- to-rail swing. The devices are fabricated on Linear Technology’s proprietary complementary bipolar process, which ensures very similar DC and AC characteristics for the output devices Q12 and Q13. First, looking at the input stage, Q5 switches the current from current source I1 between the two input stages. When the input common mode voltage VCM is near the negative supply, Q5 is reverse biased, so the current from I1 becomes the tail current for the PNP differential pair Q1-Q2. At the other extreme, when VCM is near the positive supply, the PNPs Q1-Q2 are biased off. The current from Large-Signal Response VS = ±5V VS = ±5V AV = 1 1466L/67L G23 FREQUENCY (Hz) 100 130 120 110 100 90 80 70 60 50 40 30 1k 10k 100k VS = ±15V 1466L/67L G24 Channel Separation vs Frequency 1466L/67L G22 VS = ±2.5V AV = 1 Small-Signal Response VS = ±2.5V |
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