TL05X_08 datasheet(39/67 Pages) STMICROELECTRONICS

39 / 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

output characteristics

All operating characteristics (except bandwidth and phase margin) are specified with 100-pF load capacitance.

The TL05x and TL05xA drive higher capacitive loads; however, as the load capacitance increases, the resulting

response pole occurs at lower frequencies, causing ringing, peaking, or even oscillation. The value of the load

capacitance at which oscillation occurs varies with production lots. If an application appears to be sensitive to

oscillation due to load capacitance, adding a small resistance in series with the load should alleviate the

problem. Capacitive loads of 1000 pF, and larger, may be driven if enough resistance is added in series with

the output (see Figure 81 and Figure 82).

(a) CL = 100 pF, R = 0

(b) CL = 300 pF, R = 0

(d) CL = 1000 pF, R = 0

(e) CL = 1000 pF, R = 50 Ω

(f) CL = 1000 pF, R = 2 kΩ

Figure 81. Effect of Capacitive Loads

5 V

–5 V

15 V

–15 V

(see Note A)

2 k

Ω

NOTE A: CL includes fixture capacitance.

Figure 82. Test Circuit for Output Characteristics

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