TLC27L2 Datasheet, PDF (29/33 Pages) Texas Instruments – LinCMOSE PRECISION DUAL OPERATIONAL AMPLIFIERS

TLC27L2, TLC27L2A, TLC27L2B, TLC27L7
LinCMOS™ PRECISION DUAL OPERATIONAL AMPLIFIERS
SLOS052B – OCTOBER 1987 – REVISED AUGUST 1994
APPLICATION INFORMATION
output characteristics (continued)
VI
+
–
R1
VDD
IP
RP
VO
IF
R2
IL _RL
+ _{) )} RP
VDD– VO
IF
IL
IP
ÁÁÁÁÁÁÁÁÁ IP = Pullup current required
by the operational amplifier
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ (typically 500 µA)
Figure 42. Resistive Pullup to Increase V_OH
C
VO
Figure 43. Compensation for
Input Capacitance
feedback
Operational amplifier circuits nearly always employ feedback, and since feedback is the first prerequisite for
oscillation, some caution is appropriate. Most oscillation problems result from driving capacitive loads
(discussed previously) and ignoring stray input capacitance. A small-value capacitor connected in parallel with
the feedback resistor is an effective remedy (see Figure 43). The value of this capacitor is optimized empirically.
electrostatic discharge protection
The TLC27L2 and TLC27L7 incorporate an internal electrostatic discharge (ESD) protection circuit that
prevents functional failures at voltages up to 2000 V as tested under MIL-STD-883C, Method 3015.2. Care
should be exercised, however, when handling these devices, as exposure to ESD may result in the degradation
of the device parametric performance. The protection circuit also causes the input bias currents to be
temperature dependent and have the characteristics of a reverse-biased diode.
latch-up
Because CMOS devices are susceptible to latch-up due to their inherent parasitic thyristors, the TLC27L2 and
TLC27L7 inputs and outputs were designed to withstand –100-mA surge currents without sustaining latch-up;
however, techniques should be used to reduce the chance of latch-up whenever possible. Internal protection
diodes should not, by design, be forward biased. Applied input and output voltage should not exceed the supply
voltage by more than 300 mV. Care should be exercised when using capacitive coupling on pulse generators.
Supply transients should be shunted by the use of decoupling capacitors (0.1 µF typical) located across the
supply rails as close to the device as possible.
The current path established if latch-up occurs is usually between the positive supply rail and ground and can
be triggered by surges on the supply lines and/or voltages on either the output or inputs that exceed the supply
voltage. Once latch-up occurs, the current flow is limited only by the impedance of the power supply and the
forward resistance of the parasitic thyristor and usually results in the destruction of the device. The chance of
latch-up occurring increases with increasing temperature and supply voltages.
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