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參數資料
型號: ADA4841-1YRJZ-R7
廠商: ANALOG DEVICES INC
元件分類: 運動控制電子
英文描述: Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
中文描述: OP-AMP, 300 uV OFFSET-MAX, PDSO6
封裝: ROHS COMPLIANT, MO-178AB, SOT-23, 6 PIN
文件頁數: 14/20頁
文件大小: 442K
代理商: ADA4841-1YRJZ-R7
ADA4841-1/ADA4841-2
The output noise spectral density can be calculated by
Rev. C | Page 14 of 20
[
]
2
2
2
2
2
2
2
4
4
1
4
F
G
F
S
G
F
R
ien
kTRg
R
R
ven
R
ien
kTRs
R
R
kTRf
en
vout
+
+
+
+
+
+
=
_
(6)
where:
k
is Boltzmann’s Constant.
T
is the absolute temperature, degrees Kelvin.
ien
is the amplifier input current noise spectral density, pA/√Hz.
ven
is the amplifier input voltage spectral density, nV/√Hz.
R
S
is the source resistance as shown in Figure 40.
R
F
and
R
G
are the feedback network resistances, as shown in
Figure 40.
Source resistance noise, amplifier voltage noise (ven), and the
voltage noise from the amplifier current noise (ien × R
S
) are
all subject to the noise gain term (1 + R
F
/R
G
). Note that with a
2.1 nV/√Hz input voltage noise and 1.4 pA/√Hz input current,
the noise contributions of the amplifier are relatively small for
source resistances between approximately 200 Ω and 30 kΩ.
Figure 41 shows the total RTI noise due to the amplifier vs. the
source resistance. In addition, the value of the feedback resistors
used impacts the noise. It is recommended to keep the value of
feedback resistors between 250 Ω and 1 kΩ to keep the total
noise low.
1000
0.1
10
100k
0
SOURCE RESISTANCE (
Ω
)
N
100
10
1
100
1k
10k
TOTAL AMPLIFIER NOISE
SOURCE RESISTANCE NOISE
AMPLIFIER + RESISTOR NOISE
Figure 41. RTI Noise vs. Source Resistance
HEADROOM CONSIDERATIONS
The ADA4841-1/ADA4841-2 are designed to provide maximum
input and output signal ranges with 16-bit to 18-bit dc linearity.
As the input or output headroom limits are reached, the signal
linearity degrades.
The input stage positive limit is almost exactly a volt below the
positive supply at room temperature. Input voltages above that
start to show clipping behavior. The positive input voltage limit
increases with temperature with a coefficient of about 2 mV/°C.
The lower supply limit is nominally below the minus supply;
therefore, in a standard gain configuration, the output stage
limits the signal headroom on the negative supply side. Figure 42
and Figure 43 show the nominal CMRR behavior at the limits of
the input headroom for three temperatures—this is generated
using the subtractor topology shown in Figure 44, which avoids
the output stage limitation.
300
260
220
180
140
100
60
20
–20
–60
–100
–140
–180
–220
–260
–300
3.00
5.00
0
COMMON-MODE VOLTAGE (V)
C
μ
V
3.20
3.40
3.60
3.80
4.00
4.20
4.40
4.60
4.80
–40°C
+25°C
+125°C
Figure 42. +CMV vs. Common-Mode Error vs. V
OS
0
–800
–6.00
–4.00
0
COMMON-MODE VOLTAGE (V)
C
μ
V
–50
–100
–150
–200
–250
–300
–350
–400
–450
–500
–550
–600
–650
–700
–750
–5.80 –5.60 –5.40 –5.20 –5.00 –4.80 –4.60 –4.40 –4.20
–40°C
+25°C
+125°C
Figure 43. CMV vs. Common-Mode Error vs. V
OS
+ V
OUT
– V
CM
+
0
Figure 44. Common-Range Subtractor
相關PDF資料
PDF描述
ADA4841-1YRJZ-RL Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
ADA4841-1YRZ Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
ADA4841-1YRZ-R7 Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
ADA4841-1YRZ-RL Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
ADA4841-2YRMZ Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier
相關代理商/技術參數
參數描述
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