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OPA688P Datasheet(PDF) 12 Page - Texas Instruments

Part # OPA688P
Description  Unity Gain Stable, Wideband VOLTAGE LIMITING AMPLIFIER
PDF  18 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA688P Datasheet(HTML) 12 Page - Texas Instruments

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OPA688
12
SBOS082A
PRECISION HALF WAVE RECTIFIER
Figure 4 shows a half wave rectifier with outstanding preci-
sion and speed. VH (pin 8) will default to a voltage between
3.1 and 3.8V if left open, while the negative limit is set to
ground.
When VO tries to go below ground, CCII charges C1 through
D1, which restores the output back to ground. D1 adds a
propagation delay to the restoration process, which then has
an exponential decay with time constant R1C1/G (G = +2 =
the OPA688 gain). When the signal is above ground, it
decays to ground with a time constant of R2C1. The OPA688
output recovers very quickly from overdrive.
FIGURE 6. Unity-Gain Buffer.
FIGURE 4. Precision Half Wave Rectifier.
OPA688
6
V
O
–V
S = –5V
+V
S = +5V
V
IN
2
3
4
7
8
5
402
Ω
402
Ω
200
Ω
NC
VERY HIGH SPEED SCHMITT TRIGGER
Figure 5 shows a very high-speed Schmitt trigger. The
output levels are precisely defined, and the switching time
is exceptional. The output voltage swings between
±2V.
UNITY-GAIN BUFFER
Figure 6 shows a unity-gain voltage buffer using the OPA688.
The feedback resistor (RF) isolates the output from any board
inductance between pins 2 and 6. We recommend that
RF ≥ 24.9Ω 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.
DC RESTORER
Figure 7 shows a DC restorer using the OPA688 and
OPA660. The OPA660’s OTA amplifier is used as a Current
Conveyor (CCII) in this circuit, with a current gain of 1.0.
OPA688
V
O
8
5
V
L = –1V
V
H = +3V
R
1
40.2
Ω
402
Ω
R
2
100k
Ω
D
1
402
Ω
20
Ω
20
Ω
V
IN
200
Ω
R
Q
1k
Ω
D
2
C
1
100pF
6
1
C
E
B
3
CCII
2
U1
5
+1
U1
U1 = OPA660
R
Q = 1kΩ (sets U1’s IQ)
D
1, D2 = 1N4148
FIGURE 7. DC Restorer.
OPA688
6
V
O
–V
S = –5V
3
2
4
7
8
5
0.1
µF
0.1
µF
3.01k
Ω 1.91kΩ
3.01k
Ω 1.91kΩ
402
Ω
+V
S = +5V
200
Ω
V
IN
133
Ω
FIGURE 5. Very High Speed Schmitt Trigger.
OPA688
V
O
R
S
V
S
R
F
24.9
Ω
R
C



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