V1 20V p-p 1/4 OP470 50 50k CHANNEL SEPARATION = 20 LOG " />
參數(shù)資料
型號： OP470EY
廠商： Analog Devices Inc
文件頁數(shù)： 16/16頁
文件大小： 0K
描述： IC OPAMP GP 6MHZ QUAD LN 14CDIP
標(biāo)準(zhǔn)包裝： 25
放大器類型： 通用
電路數(shù)： 4
轉(zhuǎn)換速率： 2 V/µs
增益帶寬積： 6MHz
電流 - 輸入偏壓： 6nA
電壓 - 輸入偏移： 100µV
電流 - 電源： 9mA
電壓 - 電源，單路/雙路(±)： 9 V ~ 36 V，±4.5 V ~ 18 V
工作溫度： -25°C ~ 85°C
安裝類型： 通孔
封裝/外殼： 14-CDIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 14-CERDIP
包裝： 管件
產(chǎn)品目錄頁面： 772 (CN2011-ZH PDF)
REV. B
OP470
–9–
500
5k
V1 20V p-p
1/4
OP470
50
50k
CHANNEL SEPARATION = 20 LOG
V1
V2/1000
V2
1/4
OP470
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 OP470 is a very low-noise quad op amp, exhibiting a typi-
cal voltage noise of only 3.2 nV
÷Hz @ 1 kHz. The exceptionally
low-noise characteristics of the OP470 are 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 propor-
tional to the square root of the collector current. As a result, the
outstanding voltage noise performance of the OP470 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 = up 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. Figure 4 shows the relationship
between total noise at 1 kHz and source resistance. For RS < 1 k
W
the total noise is dominated by the voltage noise of the OP470.
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
OP470. When RS exceeds 20 k
W, current noise of the OP470
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
proportional to the square root of frequency. In Figure 5, current
noise of the OP470 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 OP470, will provide lower total noise.
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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OP-470EY 制造商:AD 制造商全稱:Analog Devices 功能描述:VERY LOW NOISE QUAD OPERATIONAL AMPLIFIER
OP470FY 制造商:Analog Devices 功能描述:
OP-470FY 制造商:AD 制造商全稱:Analog Devices 功能描述:VERY LOW NOISE QUAD OPERATIONAL AMPLIFIER
OP470G 制造商:Analog Devices 功能描述:
OP-470G 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual/Quad Low Noise, Precision Operational Amplifiers
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