TLE2227 Datasheet, PDF (30/31 Pages) Texas Instruments – EXCALIBUR LOW-NOISE HIGH-SPEED PRECISION DUAL OPERATIONAL AMPLIFIERS

TLE2227, TLE2227Y, TLE2237, TLE2237Y
EXCALIBUR LOW-NOISE HIGH-SPEED
PRECISION DUAL OPERATIONAL AMPLIFIERS
SLOS184 – FEBRUARY 1997
APPLICATION INFORMATION
voltage-follower applications
The TLE22x7C circuitry includes input-protection diodes to limit the voltage across the input transistors;
however, no provision is made in the circuit to limit the current if these diodes are forward biased. This condition
can occur when the device is operated in the voltage-follower configuration and driven with a fast, large-signal
pulse. A feedback resistor is recommended to limit the current to a maximum of 1 mA to prevent degradation
of the device. Also, this feedback resistor forms a pole with the input capacitance of the device. For feedback
resistor values greater than 10 kΩ, this pole degrades the amplifier’s phase margin. This problem can be
alleviated by adding a capacitor (20 pF to 50 pF) in parallel with the feedback resistor (see Figure 53).
CF = 20 to 50 pF
IF ≤ 1 mA
RF
VCC ₊
–
VO
VI
+
VCC _–
Figure 53. Voltage-Follower Circuit
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