TL05X datasheet(40/67 Pages) STMICROELECTRONICS

40 / 67 page

TL05x, TL05xA

ENHANCED-JFET LOW-OFFSET

OPERATIONAL AMPLIFIERS

SLOS178A – FEBRUARY 1997 - REVISED FEBRUARY 2003

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

input characteristics

The TL05x and TL05xA are specified with a minimum and a maximum input voltage that, if exceeded at either

input, could cause the device to malfunction.

Because of the extremely high input impedance and resulting low-bias current requirements, the TL05x and

TL05xA are well suited for low-level signal processing; however, leakage currents on printed-circuit boards and

sockets easily can exceed bias current requirements and cause degradation in system performance. It is good

practice to include guard rings around inputs (see Figure 83). These guards should be driven from a

low-impedance source at the same voltage level as the common-mode input.

Unused amplifiers should be connected as grounded unity-gain followers to avoid possible oscillation.

–

(a) NONINVERTING AMPLIFIER

(b) INVERTING AMPLIFIER

Figure 83. Use of Guard Rings

noise performance

The noise specifications in operational amplifier circuits are greatly dependent on the current in the first-stage

differential amplifier. The low input-bias current requirements of the TL05x and TL05xA result in a very low

current noise. This feature makes the devices especially favorable over bipolar devices when using values of

circuit impedance greater than 50 k

Ω.

TL05X 数据表(PDF) 40 Page - STMicroelectronics