Datasheet LT1457 (Analog Devices) - 6

LT1457
W U TYPICAL PERFORMANCE CHARACTERISTICS Large-Signal Response Small-Signal Response Small-Signal Response A A A V = 1, CL = 100pF V = 1, CL = 1000pF V = 1, CL = 10,000pF
LT1457 TPC19 LT1457 TPC20 LT1457 TPC21
U U W U APPLICATIONS INFORMATION Phase Reversal Protection
Most industry standard JFET input single, dual, and quad of an LF412A in the unity gain follower mode (B), and the op amps (e.g., LF156, LF351, LF353, LF411, LF412, response of the LT1457 (C). OP-15, OP-16, OP-215, and TL084) exhibit phase reversal The phase reversal of photo (B) can cause lock-up in servo at the output when the negative common-mode limit at the systems. The LT1457 does not phase-reverse due to a input is exceeded (i.e., below –12V with ±15V supplies). unique phase reversal protection circuit. The photos show a ±16V sine wave input (A), the response LT1457 AI01 LT1457 AI02 LT1457 AI03
(A)
±
16V Sine Wave Input (B) LF412A Output (C) LT1457 Output All Photos 5V/Div Vertical Scale, 50
µ
s/Div Horizontal Scale
6