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LT1884 Datasheet(PDF) 9 Page - Linear Technology |
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LT1884 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page LT1884/LT1885 9 The LT1884/LT1885 dual op amp features exceptional input precision with rail-to-rail output swing. Slew rate and small-signal bandwidth are superior to other amplifi- ers with comparable input precision. These characteris- tics make the LT1884/LT1885 a convenient choice for precision low voltage systems and for improved AC per- formance in higher voltage precision systems. Maintain- ing the advantage of the precision inherent in the amplifier depends upon proper applications circuit design and board layout. Preserving Input Precision Preserving the input voltage accuracy of the LT1884/ LT1885 requires that the applications circuit and PC board layout do not introduce errors comparable to or greater than the 30 µV offset. Temperature differentials across the input connections can generate thermocouple voltages of 10s of microvolts. PC board layouts should keep connec- tions to the amplifier’s input pins close together and away from heat dissipating components. Air currents across the board can also generate temperature differentials. The extremely low input bias currents, 100pA, allow high accuracy to be maintained with high impedance sources and feedback networks. The LT1884/LT1885’s low input bias currents are obtained by using a cancellation circuit on-chip. This causes the resulting IBIAS+ and IBIAS– to be uncorrelated, as implied by the IOS specification being comparable to the IBIAS. The user should not try to balance the input resistances in each input lead, as is commonly recommended with most amplifiers. The impedance at either input should be kept as small as possible to mini- mize total circuit error. PC board layout is important to ensure that leakage currents do not corrupt the low IBIAS of the amplifier. In high precision, high impedance circuits, the input pins should be surrounded by a guard ring of PC board interconnect, with the guard driven to the same common mode voltage as the amplifier inputs. Input Common Mode Range The LT1884/LT1885 output is able to swing close to each power supply rail, but the input stage is limited to operat- ing between VEE + 0.8V and VCC – 0.9V. Exceeding this common mode range will cause the gain to drop to zero; however, no gain reversal will occur. Input Protection The inverting and noninverting input pins of the LT1884/ LT1885 have limited on-chip protection. ESD protection is provided to prevent damage during handling. The input transistors have voltage clamping and limiting resistors to protect against input differentials up to 10V. Short tran- sients above this level will also be tolerated. If the input pins may be subject to a sustained differential voltage above 10V, external limiting resistors should be used to prevent damage to the amplifier. A 1k resistor in each input lead will provide protection against a 30V differential voltage. Capacitive Loads The LT1884/LT1885 can drive capacitive loads up to 300pF when configured for unity gain. The capacitive load driving capability increases as the amplifier is used in higher gain configurations. Capacitive load driving may also be increased by decoupling the capacitance from the output with a small resistance. Input Bias Currents While it may be tempting to seek out a JFET amplifier for low input bias current, remember that bipolar devices improve with temperature while JFETs degrade. APPLICATIO S I FOR ATIO |
Similar Part No. - LT1884_15 |
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Similar Description - LT1884_15 |
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