TLC072-Q1_15 Datasheet, PDF (14/24 Pages) Texas Instruments – WIDE-BANDWIDTH HIGH-OUTPUT-DRIVE SINGLE-SUPPLY OPERATIONAL AMPLIFIER

TLC072-Q1
SLOS583 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com
For the TLC072, the maximum feedback resistor recommended is 5 kΩ; larger resistances can be used but a
capacitor in parallel with the feedback resistor is recommended to counter the effects of the input capacitance
pole.
The TLC072 with a 1-V step response has an 80% overshoot with a natural frequency of 3.5 MHz when
configured as a unity gain buffer and with a 10-kΩ feedback resistor. By adding a 10-pF capacitor in parallel with
the feedback resistor, the overshoot is reduced to 40% and eliminates the natural frequency, resulting in a much
faster settling time (see Figure 40). The 10-pF capacitor was chosen for convenience only.
Load capacitance had little effect on these measurements due to the excellent output drive capability of the
TLC072.
2
V_IN
1
10 pF
1.5
1
0.5
0
−0.5
With
0
C_F = 10 pF
−1
V_OUT
V_DD = ±5 V
A_V = +1
R_F = 10 kΩ
R_L = 600 Ω
C_L = 22 pF
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
t - Time - µs
10 kΩ
_
IN
+
50 Ω
600 Ω
Figure 40. 1-V Step Response
22 pF
General Configurations
When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often required.
The simplest way to accomplish this is to place an RC filter at the noninverting terminal of the amplifier (see
Figure 41).
R_G
R_F
V_I
R1
−
+
V_O
C1
f–3dB
+
1
2pR1C1
ǒ Ǔǒ Ǔ ^VO
VI
+
1
)
RF
RG
1
1 ) sR1C1
Figure 41. Single-Pole Low-Pass Filter
14
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