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參數(shù)資料
| 型號(hào)： | 5962-88721012A |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | DUAL OP-AMP, 175 uV OFFSET-MAX, 5 MHz BAND WIDTH, CQCC20 |
| 封裝： | CERAMIC, LCC-20 |
| 文件頁(yè)數(shù)： | 16/16頁(yè) |
| 文件大?。?/td> | 1708K |
| 代理商： | 5962-88721012A |
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REV. B
–9–
OP270
SPECIFICATIONS
1/2
OP270
V1 20Vp-p
5k
500
5k
50
V2
1/2
OP270
CHANNEL SEPERATION = 20 log
V
1
V
2
/1000
Figure 1. Channel Separation Test Circuit
1/2
OP270
1/2
OP270
7
1
8
5
6
3
2
100k
200k
4
+18V
–18V
Figure 2. Burn-In Circuit
APPLICATIONS INFORMATION
VOLTAGE AND CURRENT NOISE
The OP270 is a very low-noise dual op amp, exhibiting atypical
voltage noise of only 3.2 nV/
÷Hz @ 1 kHz. The exceptionally
low noise characteristics of the OP270 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 propor-
tional to the square root of the collector current. As a result, the
outstanding voltage noise performance of the OP270 is gained
at the expense of current noise performance, which is normal 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)l and resistor noise (et).
TOTAL NOISE AND SOURCE RESISTANCE The total
noise of an op amp can be calculated by:
where:
Ee
i R
e
nn
n
S
t
=
() + () + ()
22
2
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 3 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 OP270. 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 OP270. When
RS exceeds 20 k
W, current noise of the OP270 becomes the
major contributor to total noise.
RS – SOURCE RESISTANCE ( )
100
1k
10k
100k
TOT
A
L
N
O
ISE
–
nV/
Hz
1
10
OP270
RESISTOR
NOISE ONLY
OP200
Figure 3. Total Noise vs Source Resistance
(Including Resistor Noise) at 1kHz
Figure 4 also shows the relationship between total noise
and source resistance, but at 10 Hz. Total noise increases
more quickly than shown in Figure 1 because current noise
is inversely proportional to the square root of frequency. In
Figure 4, current noise of the OP270 dominates the total
noise when RS> 5 k
W.
From Figures 3 and 4 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 OP200, with
lower current noise than the OP270, 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 |
|---|---|
| 59628872101PA | 制造商:AD 功能描述:OP270-009Z |
| 5962-8872101PA | 制造商:Analog Devices 功能描述:OP Amp Dual GP 制造商:Analog Devices 功能描述:OP AMP DUAL GP 18V 8CDIP - Rail/Tube 制造商:Analog Devices 功能描述:DUAL PRECISION INSTR. AMPLIFIER ((NS)) 制造商:Analog Devices Inc. 功能描述:DUAL LOW-NOISE IC 制造商:Analog Devices Inc. 功能描述:Precision Amplifiers DUAL LOW-NOISE IC |
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| 5962-8872101VPA | 制造商:Analog Devices 功能描述:HIGH-PERFORMANCE MONOLITHIC DUAL OP AMP OP270AZ/QMLV - Rail/Tube |
| 5962-88721022A | 制造商:Rochester Electronics LLC 功能描述:DUAL, HI-SPEED IC - Bulk |
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