Datasheet

TLC27M4, TLC27M4A, TLC27M4B, TLC27M4Y, TLC27M9
LinCMOS PRECISION QUAD OPERATIONAL AMPLIFIERS
SLOS093C – OCTOBER 1987 – REVISED MAY 1999
32
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise performance (continued)
V
I
(a) NONINVERTING AMPLIFIER (c) UNITY-GAIN AMPLIFIER
–
+
(b) INVERTING AMPLIFIER
V
I
–
+
–
+
V
I
V
O
V
O
V
O
Figure 40. Guard-Ring Schemes
output characteristics
The output stage of the TLC27M4 and TLC27M9 is designed to sink and source relatively high amounts of
current (see
typical characteristics ). If the output is subjected to a short-circuit condition, this high current
capability can cause device damage under certain conditions. Output current capability increases with supply
voltage.
All operating characteristics of the TLC27M4 and TLC27M9 were measured using a 20-pF load. The devices
drive higher capacitive loads; however, as output load capacitance increases, the resulting response pole
occurs at lower frequencies, thereby causing ringing, peaking, or even oscillation (see Figure 41). In many
cases, adding a small amount of resistance in series with the load capacitance alleviates the problem.
–
+
2.5 V
V
O
C
L
–2.5 V
V
I
(d) TEST CIRCUIT
T
A
= 25°C
f = 1 kHz
V
IPP
= 1 V
(a) C
L
= 20 pF, R
L
= NO LOAD (b) C
L
= 170 pF, R
L
= NO LOAD
(c) C
L
= 190 pF, R
L
= NO LOAD
Figure 41. Effect of Capacitive Loads and Test Circuit