LT1457CN8 查看數據表（PDF） - Linear Technology

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LT1457CN8

Dual, Precision JFET Input Op Amp

Linear Technology 

LT1457

TYPICAL PERFORMANCE CHARACTERISTICS

Large-Signal Response

AV = 1, CL = 100pF

Small-Signal Response

AV = 1, CL = 1000pF

Small-Signal Response

AV = 1, CL = 10,000pF

LT1457 TPC19

LT1457 TPC20

LT1457 TPC21

APPLICATIONS INFORMATION

Phase Reversal Protection

Most industry standard JFET input single, dual, and quad

op amps (e.g., LF156, LF351, LF353, LF411, LF412,

OP-15, OP-16, OP-215, and TL084) exhibit phase reversal

at the output when the negative common-mode limit at the

input is exceeded (i.e., below –12V with ±15V supplies).

The photos show a ±16V sine wave input (A), the response

of an LF412A in the unity gain follower mode (B), and the

response of the LT1457 (C).

The phase reversal of photo (B) can cause lock-up in servo

systems. The LT1457 does not phase-reverse due to a

unique phase reversal protection circuit.

LT1457 AI01

(A) ±16V Sine Wave Input

LT1457 AI02

(B) LF412A Output

All Photos 5V/Div Vertical Scale, 50µs/Div Horizontal Scale

LT1457 AI03

(C) LT1457 Output

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