參數(shù)資料
型號(hào)： OP284
廠商： Analog Devices, Inc.
英文描述： Precision Rail-to-Rail Input & Output Operational Amplifiers
中文描述： 精密軌到軌輸入
文件頁(yè)數(shù)： 13/20頁(yè)
文件大?。?/td> 291K
代理商： OP284
REV. 0
–13–
OP184/OP284/OP484
Overdrive Recovery
T he overdrive recovery time of an operational amplifier is the
time required for the output voltage to recover to its linear re-
gion from a saturated condition. T he recovery time is important
in applications where the amplifier must recover quickly after a
large transient event. T he circuit shown in Figure 48 was used
to evaluate the OP284’s overload recovery time. T he OP284
takes approximately 2
μ
s to recover from positive saturation and
approximately 1
μ
s to recover from negative saturation.
V
OUT
2
3
1
+5V
1/2
OP284
8
4
R3
9k
R1
10k
R2
10k
V
IN
10V STEP
–5V
Figure 48. Output Overload Recovery Test Circuit
A Single-Supply, +3 V Instrumentation Amplifier
T he OP284’s low noise, wide bandwidth, and rail-to-rail input/
output operation makes it ideal for low supply voltage applica-
tions, such as in an two op amp instrumentation amplifier as
shown in Figure 49. T he circuit utilizes the classic two op amp
instrumentation amplifier topology, with four resistors to set the
gain. T he transfer equation of the circuit is identical to that of a
noninverting amplifier. Resistors R2 and R3 should be closely
matched to each other as well as resistors (R1 + P1) and R4 to
ensure good common-mode rejection performance. Resistor
networks should be used in this circuit for R2 and R3 because
they exhibit the necessary relative tolerance matching for good
performance. Matched networks also exhibit tight relative resis-
tor temperature coefficients for good circuit temperature stabil-
ity. T rimming potentiometer P1 is used for optimum dc CMR
adjustment, and C1 is used to optimize ac CMR. With the cir-
cuit values as shown, circuit CMR is better than 80 dB over the
frequency range of 20 Hz to 20 kHz. Circuit RT I (Referred-to-
Input) noise in the 0.1 Hz to 10 Hz band is an impressively low
0.45
μ
V p-p. Resistors RP1 and RP2 serve to protect the
OP284’s inputs against input overvoltage abuse. Capacitor C2
can be included to the limit circuit bandwidth and, therefore,
wide bandwidth noise in sensitive applications. T he value of
this capacitor should be adjusted depending on the required
closed-loop bandwidth of the circuit. T he R4-C2 time constant
creates a pole at a frequency equal to:
f
(3
dB
)
=
1
2
π
R
4
C
2
V
OUT
R3
1.1k
5
6
7
+3V
A2
A1, A2 = 1/2 OP284
GAIN = 1 + R3
SET R2 = R3
R1 + P1 = R4
8
4
R4
10k
C2
RP1
1k
RP2
1k
R2
1.1k
R1
9.53k
P1
500
3
2
1
C1
AC CMRR
TRIM
5pF–40pF
A1
V
IN
Figure 49. A Single Supply, +3 V Low Noise Instrumenta-
tion Amplifier
A +2.5 V Reference from a +3 V Supply
In many single-supply applications, the need for a 2.5 V refer-
ence often arises. Many commercially available monolithic
2.5 V references require at least a minimum operating supply of
4 V. T he problem is exacerbated when the minimum operating
supply voltage is +3 V. T he circuit illustrated in Figure 50 is an
example of a +2.5 V reference that operates from a single +3 V
supply. T he circuit takes advantage of the OP284’s rail-to-rail
input/output voltage ranges to amplify an AD589’s 1.235 V
output to +2.5 V. T he OP284’s low T CV
OS
of 1.5
μ
V/
°
C helps
to maintain an output voltage temperature coefficient which is
dominated by the temperature coefficients of R2 and R3. In
this circuit with 100 ppm/
°
C T CR resistors, the output voltage
exhibits a temperature coefficient of 200 ppm/
°
C. Lower tempco
resistors are recommended for more accurate performance over
temperature.
One measure of the performance of a voltage reference is its
capability to recover from sudden changes in load current.
While sourcing a steady-state load current of 1 mA, this circuit
recovers to 0.01% of the programmed output voltage in 1.5
μ
s
for a total change in load current of
±
1 mA.
+2.5V
REF
P1
5k
3
2
1
+3V
1/2
OP284
8
4
R2
100k
R3
100k
+3V
0.1μF
R1
17.4k
AD589
RESISTORS = 1%, 100ppm/
°
C
POTENTIOMETER = 10 TURN, 100ppm/
°
C
Figure 50. A +2.5 V Reference that Operates on a Single
+3 V Supply
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參數(shù)描述
OP284A 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:Dual Operational Amplifier
OP284ARPFB 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:Dual Operational Amplifier
OP284ARPFE 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:Dual Operational Amplifier
OP284ARPFI 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:Dual Operational Amplifier
OP284ARPFS 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:Dual Operational Amplifier
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