Electronic Components Datasheet Search |
|
LT1880 Datasheet(PDF) 8 Page - Linear Technology |
|
LT1880 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page LT1880 8 The LT1880 single op amp features exceptional input precision with rail-to-rail output swing. Slew rate and small signal bandwidth are superior to other amplifiers with comparable input precision. These characteristics make the LT1880 a convenient choice for precision low voltage systems and for improved AC performance in higher voltage precision systems. Obtaining beneficial advantage of the precision inherent in the amplifier de- pends upon proper applications circuit design and board layout. Preserving Input Precision Preserving the input voltage accuracy of the LT1880 requires that the applications circuit and PC board layout do not introduce errors comparable to or greater than the 40 µV offset. Temperature differentials across the input connections can generate thermocouple voltages of 10’s of microvolts. PC board layouts should keep connections 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, 150pA, allow high accuracy to be maintained with high impedance sources and feedback networks. The LT1880’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 lOS specification being comparable to 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 insure that leakage cur- rents 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 LT1880 output is able to swing nearly to each power supply rail, but the input stage is limited to operating between V– + 1V and V+ – 1.2V. 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 LT1880 have limited on-chip protection. ESD protection is pro- vided to prevent damage during handling. The input tran- sistors 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 can see 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 LT1880 can drive capacitive loads up to 600pF in unity gain. The capacitive load driving capability increases as the amplifier is used in higher gain configurations, see the graph labled Capacitive Load Response. Capacitive load driving may be increased by decoupling the capacitance from the output with a small resistance. APPLICATIO S I FOR ATIO CAPACITIVE LOAD (pF) 30 25 20 15 10 5 0 10 100 1000 10000 1880 G25 AV = 10 AV = 1 VS = ±15V TA = 25°C Capacitance Load Response Getting Rail-to-Rail Operation without Rail-to-Rail Inputs The LT1880 does not have rail-to-rail inputs, but for most inverting applications and noninverting gain applications, this is largely inconsequential. Figure 1 shows the basic op amp configurations, what happens to the op amp inputs, and whether or not the op amp must have rail-to-rail inputs. |
Similar Part No. - LT1880 |
|
Similar Description - LT1880 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |