TLC082-Q1_16 Datasheet, PDF (20/38 Pages) Texas Instruments – Wide-Bandwidth High-Output-Drive Single-Supply Operational Amplifiers

TLC082-Q1, TLC084-Q1
SLOS510D – SEPTEMBER 2006 – REVISED AUGUST 2016
www.ti.com
Typical Applications (continued)
The TLC08x-Q1 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 42). 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
TLC08x-Q1.
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 kW
R_L = 600 W
C_L = 22 pF
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
t - Time - ms
10 kW
_
IN
+
50 W
600 W
Figure 42. 1-V Step Response
22 pF
9.2.1.2.4 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 43).
R_G
R_F
V_I
R1
−
+
V_O
C1
f_-3dB
=
1
2pR1C1
V_O
V_I
=
æ
ç¹
+
è
R_F
R_G
ö
÷
ø
æ
çè
1+
1
sR1C1
ö
÷ø
Figure 43. Single-Pole Low-Pass Filter
If even more attenuation is needed, a multiple-pole filter is required. The Sallen-Key filter can be used for this
task. For best results, the amplifier should have a bandwidth that is eight to ten times the filter frequency
bandwidth. Failure to do this can result in phase shift of the amplifier.
20
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