參數(shù)資料
型號(hào)： OP484FS
廠(chǎng)商： ANALOG DEVICES INC
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： Precision Rail-to-Rail Input & Output Operational Amplifiers
中文描述： QUAD OP-AMP, 500 uV OFFSET-MAX, 4.25 MHz BAND WIDTH, PDSO14
封裝： MS-012AB, SOIC-14
文件頁(yè)數(shù)： 13/20頁(yè)
文件大?。?/td> 522K
代理商： OP484FS
REV. 0
–13–
OP184/OP284/OP484
Overdrive Recovery
The 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. The recovery time is important
in applications where the amplifier must recover quickly after a
large transient event. The circuit shown in Figure 48 was used
to evaluate the OP284’s overload recovery time. The 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
The 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 a two op amp instrumentation amplifier as
shown in Figure 49. The circuit uses the classic two op amp in-
strumentation amplifier topology with four resistors to set the
gain. The 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 to 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. Trimming 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 RTI (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. The value of
this capacitor should be adjusted depending on the required
closed-loop bandwidth of the circuit. The 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. The problem is exacerbated when the minimum operating
supply voltage is +3 V. The circuit illustrated in Figure 50 is an
example of a +2.5 V reference that operates from a single +3 V
supply. The 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. The OP284’s low TCV
OS
of 1.5
μ
V/
°
C helps
maintain an output voltage temperature coefficient that is domi-
nated by the temperature coefficients of R2 and R3. In this
circuit with 100 ppm/
°
C TCR 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
capacity to recover from sudden changes in load current. While
sourcing a steady-state load current of 1 mA, this circuit recov-
ers 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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OP484FS 制造商:Analog Devices 功能描述:SEMICONDUCTORSLINEAR
OP484FS-REEL 功能描述:IC OPAMP GP R-R 4.25MHZ 14SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類(lèi)型:J-FET 電路數(shù):2 輸出類(lèi)型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件
OP484FS-REEL7 功能描述:IC OPAMP GP R-R 4.25MHZ 14SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類(lèi)型:J-FET 電路數(shù):2 輸出類(lèi)型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件
OP484FSZ 功能描述:IC OPAMP GP R-R 4.25MHZ 14SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱(chēng):LM324ADTBR2G-NDLM324ADTBR2GOSTR
OP484FSZ 制造商:Analog Devices 功能描述:IC OP-AMP PRECISION
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