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OPA698 Datasheet(PDF) 19 Page - Texas Instruments

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Part # OPA698
Description  Unity-Gain Stable, Wideband Voltage Limiting Amplifier
PDF  27 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA698 Datasheet(HTML) 19 Page - Texas Instruments

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OPA698
19
SBOS258B
www.ti.com
VERY HIGH-SPEED SCHMITT TRIGGER
Figure 15 shows a very high-speed Schmitt Trigger. The
output levels are precisely defined, and the switching time is
exceptional. The output voltage swings between VH and VL.
The circuit operates as follow. When the input voltage is less
than VHL then the output is limiting at VH. When the input is
greater than VHH then the output is limiting at VL, with VHL and
VHH defined as the following:
V
RR
R
R
V
RR
R
R
V
HL HH
REF
OUT
,
||
||
||
||
=×
+
×
12
3
1
12
3
2
Due to the inverting function realized by the Schmitt Trigger,
VHL corresponds to VOUT = VH, and VHH corresponds to
VOUT = VL.
Time (100ns/div)
3
2
1
0
–1
–2
–3
V
IN
V
OUT
OPA698
R
2
402
Ω
R
1
200
Ω
R
3
200
Ω
V
REF
V
OUT
V
H
V
L
+2V
–2V
V
IN
FIGURE 13. Soft-Clipping Circuit.
FIGURE 14. Soft Clipping with a Gain of 1/3 above the clamp
level (
±1V).
Figure 16 shows the Schmitt Trigger operating with VREF =
+5V. This gives us VHH = 2.4V and VHL = 1.6V. The propa-
gation delay for the OPA698 in a Schmitt Trigger configura-
tion is 6ns from high-to-low, and 5ns from low-to-high.
OPA698
V
H
V
L
R
4
2k
Ω
R
3
1k
Ω
24.9
Ω
R
2
2k
Ω
V
CL
–1V
V
CH
+1V
V
OUT
V
IN
R
1
1k
Ω
UNITY-GAIN BUFFER
Figure 17 shows a unity-gain voltage buffer using the OPA698.
The feedback resistor (RF) isolates the output from the input
capacitance at the inverting input. RF = 24.9Ω is recom-
mended for unity-gain buffer applications. RC is an optional
compensation resistor that reduces the peaking typically
seen at G = +1. Choosing RC = RS + RF gives a unity-gain
buffer with approximately the G = +2 frequency response.
The frequency response for this circuit is shown in the
electrical characteristics curves.
Time (10ns/div)
4
3
2
1
0
–1
–2
–3
–4
V
IN
V
OUT
FIGURE 16. Schmitt Trigger Time Domain Response for a
10MHz Sinewave.
OPA688
V
O
R
S
V
S
R
F
24.9
Ω
R
C
FIGURE 17. Unity-Gain Buffer.
FIGURE 15. Very High-Speed Schmitt Trigger.



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