LF155, LF156, LF355, LF356, LF357
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SNOSBH0C –MAY 2000–REVISED MARCH 2013
Figure 44. Fast Logarithmic Converter
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Dynamic range: 100μA ≤ Ii ≤ 1mA (5 decades), |VO| = 1V/decade
Transient response: 3μs for ΔIi = 1 decade
C1, C2, R2, R3: added dynamic compensation
VOS adjust the LF156 to minimize quiescent error
RT: Tel Labs type Q81 + 0.3%/°C
Figure 45. Precision Current Monitor
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VO = 5 R1/R2 (V/mA of IS)
R1, R2, R3: 0.1% resistors
Use LF155 for
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Common-mode range to supply range
Low IB
Low VOS
Low Supply Current
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