Datasheet LT1784 (Analog Devices) - 10
| Fabricante | Analog Devices |
| Descripción | 2.5MHz, Over-The-Top Low Power, Rail-to-Rail Input and Output Op Amp in SOT-23 |
| Páginas / Página | 12 / 10 — APPLICATIONS INFORMATION. Shutdown. TYPICAL APPLICATIONS. Negative Rectifi … |
| Formato / tamaño de archivo | PDF / 204 Kb |
| Idioma del documento | Inglés |
APPLICATIONS INFORMATION. Shutdown. TYPICAL APPLICATIONS. Negative Rectifi er. Adjustable Clamp. SIMPLIFIED SCHEMATIC
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LT1784
APPLICATIONS INFORMATION Shutdown
the SHDN pin 1.2V or more above V–. When shut down, the supply current is less than 1μA (V– ≤ V The 6-lead part includes a shutdown feature that disables OUT ≤ V+). In normal operation, the SHDN pin can be tied to V– or left the part, reducing quiescent current and making the output fl oating. See Typical Performance Characteristics curve, high impedance. The part can be shut down by bringing “Supply Current vs SHDN pin Voltage.”
TYPICAL APPLICATIONS Negative Rectifi er Adjustable Clamp
V+ – LT1784 VIN + + - ~80mV VCLAMP LT1784 OUT – VIN + V– 10k WORKS WELL LT1784 VOUT V– TO 100kHz – VCLAMP - ~80mV 10k WORKS WELL V– TO 100kHz 1784 TA02
SIMPLIFIED SCHEMATIC
V+ Q1 Q2 Q3 D1 Q22 SHDN R1 R2 D3 6k Q19 1k –IN Q4 R6 R7 1.5k 1.5k Q17 Q20 J1 + R3 Q7 Q8 Q11 Q12 OUT 20μA 1k Q16 Q18 +IN R8 R9 0.75k 0.75k Q15 Q26 Q9 Q10 Q13 Q14 Q21 R4 R5 Q25 Q23 Q24 Q5 Q6 D4 D5 2k 2k V– 1784 SS 1784fa 10
APPLICATIONS INFORMATION Shutdown
the SHDN pin 1.2V or more above V–. When shut down, the supply current is less than 1μA (V– ≤ V The 6-lead part includes a shutdown feature that disables OUT ≤ V+). In normal operation, the SHDN pin can be tied to V– or left the part, reducing quiescent current and making the output fl oating. See Typical Performance Characteristics curve, high impedance. The part can be shut down by bringing “Supply Current vs SHDN pin Voltage.”
TYPICAL APPLICATIONS Negative Rectifi er Adjustable Clamp
V+ – LT1784 VIN + + - ~80mV VCLAMP LT1784 OUT – VIN + V– 10k WORKS WELL LT1784 VOUT V– TO 100kHz – VCLAMP - ~80mV 10k WORKS WELL V– TO 100kHz 1784 TA02
SIMPLIFIED SCHEMATIC
V+ Q1 Q2 Q3 D1 Q22 SHDN R1 R2 D3 6k Q19 1k –IN Q4 R6 R7 1.5k 1.5k Q17 Q20 J1 + R3 Q7 Q8 Q11 Q12 OUT 20μA 1k Q16 Q18 +IN R8 R9 0.75k 0.75k Q15 Q26 Q9 Q10 Q13 Q14 Q21 R4 R5 Q25 Q23 Q24 Q5 Q6 D4 D5 2k 2k V– 1784 SS 1784fa 10