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參數資料
| 型號： | OP90 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Precision Low-Voltage Micropower Operational Amplifier |
| 中文描述： | 精密低電壓微功率運算放大器 |
| 文件頁數： | 10/12頁 |
| 文件大小： | 653K |
| 代理商： | OP90 |
REV. A
OP90
–10–
Micropower Voltage-Controlled Oscillator
Two OP90s in combination with an inexpensive quad CMOS
switch comprise the precision VCO of Figure 10. This circuit
provides triangle and square wave outputs and draws only 50
μ
A
from a single 5 V supply. A1 acts as an integrator; S1 switches
the charging current symmetrically to yield positive and negative
ramps. The integrator is bounded by A2 which acts as a Schmitt
trigger with a precise hysteresis of 1.67 V, set by resistors R5,
R6, and R7, and associated CMOS switches. The resulting output
of A1 is a triangular wave with upper and lower levels of 3.33 V
and 1.67 V. The output of A2 is a square wave with almost
rail-to-rail swing. With the components shown, frequency of
operation is given by the equation:
f
V
V
( )
×
10
Hz V
OUT
CONTROL
=
/
but this is easily changed by varying C1. The circuit operates
well up to a few hundred hertz.
Micropower Single-Supply Instrumentation Amplifier
The simple instrumentation amplifier of Figure 11 provides over
110 dB of common-mode rejection and draws only 15
μ
A of
supply current. Feedback is to the trim pins rather than to the
inverting input. This enables a single amplifier to provide differ-
ential to single-ended conversion with excellent common-mode
rejection. Distortion of the instrumentation amplifier is that of a
differential pair, so the circuit is restricted to high gain applica-
3
7
C1
75nF
6
4
2
R3
100k
R4
200k
R1
200k
R2
200k
V
CONTROL
+5V
TRIANGLE
OUT
R8
200k
+5V
R5
200k
3
7
6
4
2
SQUARE
OUT
R6
200k
R7
200k
IN/OUT
OUT/IN
IN/OUT
CONT
CONT
CONT
1
IN/OUT
IN/OUT
V
SS
+5V
CONT
2
3
4
5
6
7
14
13
12
11
10
9
8
CD4066
+5V
+5V
+5V
V
DD
OUT/IN
OUT/IN
OUT/IN
OP90EZ
A2
S1
S2
S3
S4
OP90EZ
A1
Figure 10. Micropower Voltage Controlled Oscillator
tions. Nonlinearity is less than 0.1% for gains of 500 to 1000
over a 2.5 V output range. Resistors R3 and R4 set the voltage
gain and, with the values shown, yield a gain of 1000. Gain
tempco of the instrumentation amplifier is only 50 ppm/
°
C.
Offset voltage is under 150
μ
V with drift below 2
μ
V/
°
C. The
OP90
’
s input and output voltage ranges include the negative
rail which allows the instrumentation amplifier to provide true
“
zero-in, zero-out
”
operation.
R1
4.3M
R4
3.9M
R3
1M
R2
500k
GAIN
ADJUST
V
OUT
3
7
6
5
4
2
–
IN
1
+IN
0.1 F
+5V
OP90EZ
Figure 11. Micropower Single-Supply Instrumentation
Amplifier
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相關代理商/技術參數 |
參數描述 |
|---|---|
| OP-90 | 制造商:AD 制造商全稱:Analog Devices 功能描述:PRECISION, LOW VOLTAGE MICROPOWER OPERATIONAL AMPLIFIER |
| OP900SL | 功能描述:光電二極管 PN PHOTODIODE RoHS:否 制造商:Vishay Semiconductors 產品:Photodiodes 反向電壓:10 V 最大暗電流:30 nA 峰值波長:565 nm 上升時間:3.1 us 下降時間:3 us 半強度角度:50 deg 封裝 / 箱體:TO-5 |
| OP905 | 功能描述:光電二極管 Photodiode RoHS:否 制造商:Vishay Semiconductors 產品:Photodiodes 反向電壓:10 V 最大暗電流:30 nA 峰值波長:565 nm 上升時間:3.1 us 下降時間:3 us 半強度角度:50 deg 封裝 / 箱體:TO-5 |
| OP906 | 功能描述:光電二極管 Photodiode RoHS:否 制造商:Vishay Semiconductors 產品:Photodiodes 反向電壓:10 V 最大暗電流:30 nA 峰值波長:565 nm 上升時間:3.1 us 下降時間:3 us 半強度角度:50 deg 封裝 / 箱體:TO-5 |
| OP90ARC/883 | 制造商:AD 制造商全稱:Analog Devices 功能描述:PRECISION, LOW VOLTAGE MICROPOWER OPERATIONAL AMPLIFIER |
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