Datasheet
_
+
THS3110
R
F
1 kΩ
49.9 Ω
0.1 µF 6.8 µF
-V
S
-15 V
R
G
50 Ω Source
+
V
I
0.1 µF 6.8 µF
+
+V
S
15 V
49.9 Ω
50 Ω LOAD
1 kΩ
THS3110
THS3111
SLOS422E –SEPTEMBER 2003–REVISED OCTOBER 2009........................................................................................................................................
www.ti.com
APPLICATION INFORMATION
MAXIMUM SLEW RATE FOR REPETITIVE
SIGNALS
The THS3110 and THS3111 are recommended for
high slew rate pulsed applications where the internal
nodes of the amplifier have time to stabilize between
pulses. It is recommended to have at least 20-ns
delay between pulses.
The THS3110 and THS3111 are not recommended
for applications with repetitive signals (sine, square,
sawtooth, or other) that exceed 900 V/μs. Using the
part in these applications results in excessive current
draw from the power supply and possible device
damage.
For applications with high slew rate, repetitive signals,
the THS3091 and THS3095 (single), or THS3092 and
THS3096 (dual) are recommended.
Figure 51. Wideband, Noninverting Gain
Configuration
WIDEBAND, NONINVERTING OPERATION
The THS3110 and THS3111 are unity-gain stable, Current-feedback amplifiers are highly dependent on
100-MHz, current-feedback operational amplifiers, the feedback resistor R
F
for maximum performance
designed to operate from a ±5-V to ±15-V power and stability. Table 1 shows the optimal gain setting
supply. resistors R
F
and R
G
at different gains to give
maximum bandwidth with minimal peaking in the
Figure 51 shows the THS3111 in a noninverting gain
frequency response. Higher bandwidths can be
of 2-V/V configuration typically used to generate the
achieved, at the expense of added peaking in the
performance curves. Most of the curves were
frequency response, by using even lower values for
characterized using signal sources with 50-Ω source
R
F
. Conversely, increasing R
F
decreases the
impedance, and with measurement equipment
bandwidth, but stability is improved.
presenting a 50-Ω load impedance.
Table 1. Recommended Resistor Values for
Optimum Frequency Response
THS3110 AND THS3111 R
F
AND R
G
VALUES FOR MINIMAL PEAKING WITH R
L
= 100 Ω
GAIN (V/V) SUPPLY VOLTAGE (V) R
G
(Ω) R
F
(Ω)
±15 — 1.5 k
1
±5 — 1.5 k
±15 1 k 1 k
2
±5 1.15 k 1.15 k
±15 200 806
5
±5 200 806
±15 66.5 604
10
±5 66.5 604
±15 1 k 1 k
–1
±5 1 k 1 k
–2 ±15 and ±5 549 1.1 k
–5 ±15 and ±5 182 909
–10 ±15 and ±5 64.9 649
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