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參數(shù)資料
| 型號： | OPA688U |
| 元件分類： | 限幅放大器 |
| 英文描述： | Unity Gain Stable, Wideband VOLTAGE LIMITING AMPLIFIER |
| 中文描述： | 單位增益穩(wěn)定，寬帶電壓限幅放大器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 185K |
| 代理商： | OPA688U |
12
OPA688
PRECISION HALF WAVE RECTIFIER
Figure 4 shows a half wave rectifier with outstanding preci-
sion and speed. V
H
(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 V
O
tries to go below ground, CCII charges C
1
through
D
1
, which restores the output back to ground. D
1
adds a
propagation delay to the restoration process, which then has
an exponential decay with time constant R
1
C
1
/G (G = +2 =
the OPA688 gain). When the signal is above ground, it
decays to ground with a time constant of R
2
C
1
. 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
402
200
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 (R
F
) isolates the output from any board
inductance between pins 2 and 6. We recommend that R
F
≥
24.9
for unity-gain buffer applications. R
C
is an optional
compensation resistor that reduces the peaking typically seen
at G = +1. Choosing R
C
= R
S
+ R
F
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
402
V
H
= +3V
R
1
40.2
402
R
2
100k
D
1
20
20
V
IN
200
R
Q
1k
D
2
C
100pF
6
1
C
E
B
3
CCII
2
U1
5
+1
U1
U1 = OPA660
R
Q
= 1k
(sets U1’s I
Q
)
D
1
, D
2
= 1N4148
FIGURE 7. DC Restorer.
OPA688
6
V
O
–V
S
= –5V
3
2
4
7
8
5
0.1μF
0.1μF
3.01k
1.91k
3.01k
1.91k
402
+V
S
= +5V
200
V
IN
133
FIGURE 5. Very High Speed Schmitt Trigger.
OPA688
V
O
R
S
V
S
R
F
24.9
R
C
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA688P | ECONOLINE: RB & RA - Dual Output from a Single Input Rail- Power Sharing on Output- Industry Standard Pinout- 1kVDC & 2kVDC Isolation- Custom Solutions Available- UL94V-0 Package Material- Efficiency to 85% |
| OPA688 | Unity Gain Stable, Wideband VOLTAGE LIMITING AMPLIFIER |
| OPA689U | Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
| OPA689P | Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
| OPA689 | Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA688U/2K5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| OPA689 | 制造商:BB 制造商全稱:BB 功能描述:Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
| OPA689M | 制造商:TI 制造商全稱:Texas Instruments 功能描述:GAIN 4 STABLE WIDEBAND VOLTAGE-LIMITING AMPLIFIER |
| OPA689MJD | 制造商:Texas Instruments 功能描述:OP Amp Single Volt Fdbk ±6V/12V 8-Pin SBCDIP Tube |
| OPA689P | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
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