V1 20V p-p 1/4 OP471 50 50k CHANNEL SEPARATION = 20 LOG " />
參數(shù)資料
型號： OP471GSZ-REEL
廠商： Analog Devices Inc
文件頁數(shù)： 14/16頁
文件大?。?/td> 0K
描述： IC OPAMP GP 6.5MHZ QUAD 16SOIC
標(biāo)準(zhǔn)包裝： 1,000
放大器類型： 通用
電路數(shù)： 4
轉(zhuǎn)換速率： 8 V/µs
增益帶寬積： 6.5MHz
電流 - 輸入偏壓： 25nA
電壓 - 輸入偏移： 1000µV
電流 - 電源： 9.2mA
電壓 - 電源，單路/雙路(±)： ±4.5 V ~ 18 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC W
包裝： 帶卷 (TR)
REV. A
OP471
–7–
500
5k
V1 20V p-p
1/4
OP471
50
50k
CHANNEL SEPARATION = 20 LOG
V1
V2 / 1000
V2
1/4
OP471
Figure 2. Channel Separation Test Circuit
7
6
5
1
2
3
+1V
+18V
4
–18V
11
A
+1V
B
D
14
13
12
–1V
C
8
9
10
–1V
Figure 3. Burn-In Circuit
APPLICATIONS INFORMATION
Voltage and Current Noise
The OP471 is a very low-noise quad op amp, exhibiting a typical
voltage noise of only 6.5
Hz @ 1 kHz. The low noise character-
istic of the OP471 is, in part, achieved by operating the input
transistors at high collector currents since the voltage noise is
inversely proportional to the square root of the collector current.
Current noise, however, is directly proportional to the square
root of the collector current. As a result, the outstanding voltage
noise performance of the OP471 is gained at the expense of current
noise performance which is typical for low noise amplifiers.
To obtain the best noise performance in a circuit, it is vital to
understand the relationship between voltage noise (en), current
noise (in), and resistor noise (et).
Total Noise and Source Resistance
The total noise of an op amp can be calculated by:
Ee
i R
e
nn
n
S
t
=
() +() +()
22
2
where:
En = total input referred noise
en = op amp voltage noise
in = op amp current noise
et = source resistance thermal noise
RS = source resistance
The total noise is referred to the input and at the output would
be amplified by the circuit gain.
RS – SOURCE RESISTANCE –
100
1
100
100k
TOT
A
L
N
OISE
–
nV/
Hz
10
10k
1k
OP11
OP400
OP471
OP470
RESISTOR
NOISE ONLY
Figure 4. Total Noise vs. Source Resistance (Including
Resistor Noise) at 1 kHz
RS – SOURCE RESISTANCE –
100
1
100
100k
TOT
A
L
N
OISE
–
nV/
Hz
10
10k
1k
OP11
OP400
OP471
OP470
RESISTOR
NOISE ONLY
Figure 5. Total Noise vs. Source Resistance (Including
Resistor Noise) at 10 Hz
Figure 4 shows the relationship between total noise at 1 kHz
and source resistance. For RS < 1 k
W the total noise is domi-
nated by the voltage noise of the OP471. As RS rises above 1 k
W,
total noise increases and is dominated by resistor noise rather
than by voltage or current noise of the OP471. When RS exceeds
20 k
W, current noise of the OP471 becomes the major contributor
to total noise.
Figure 5 also shows the relationship between total noise and source
resistance, but at 10 Hz. Total noise increases more quickly
than shown in Figure 4 because current noise is inversely pro-
portional to the square root of frequency. In Figure 5, current
noise of the OP471 dominates the total noise when RS > 5 k
W.
From Figures 4 and 5, it can be seen that to reduce total noise,
source resistance must be kept to a minimum. In applications
with a high source resistance, the OP400, with lower current
noise than the OP471, will provide lower total noise.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OP471K 制造商:Ohmite Mfg Co 功能描述:
OP471P 制造商:AD 制造商全稱:Analog Devices 功能描述:High Speed, Low Noise Quad Operational Amplifier
OP471S 制造商:AD 制造商全稱:Analog Devices 功能描述:High Speed, Low Noise Quad Operational Amplifier
OP471Y 制造商:AD 制造商全稱:Analog Devices 功能描述:High Speed, Low Noise Quad Operational Amplifier
OP472GS 制造商:Analog Devices 功能描述:
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