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參數(shù)資料
| 型號(hào)： | ACF2101 |
| 英文描述： | Low Noise, Dual SWITCHED INTEGRATOR |
| 中文描述： | 低噪聲，雙交換式積分器 |
| 文件頁(yè)數(shù)： | 10/14頁(yè) |
| 文件大?。?/td> | 192K |
| 代理商： | ACF2101 |
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ACF2101
10
OUTPUT OVERLOAD
When the output to the ACF2101 integrates to the negative
limit, the output voltage smoothly limits at approximately
1.5V from the negative power supply, and reset time will
increase by approximately 5
μ
s for overload recovery. For
fastest reset time avoid integrating to the negative limit.
EXTERNAL CAPACITOR
An external integration capacitor may be used instead of or
in addition to the internal 100pF integration capacitor. Since
the transfer function depends upon the characteristics of the
integration capacitor, it must be carefully selected. An
external integration capacitor should have low voltage
coefficient, temperature coefficient, memory, and leakage
current. The optimum selection depends upon the require-
ments of the specific application. Suitable types include
NPO ceramic, polycarbonate, polystyrene, and silver mica.
If the internal integration capacitor is not used, the Cap pin
should be connected to common.
FIGURE 7. Frequency Response.
FREQUENCY RESPONSE
fs/10
fs
10fs
20fs
Sampling Frequency (fs)
F
0
–10
–20
–30
–40
–50
–20dB/decade
Slope
Nyquist
(fs/2)
OUTPUT VOLTAGE
The integrator output voltage range is from +0.5V to –10V.
The output voltage (V
OUT
) can be calculated as:
V
OUT
=
I
IN
x
t
V
OUT
= the maximum output voltage (in volts)
C
INT
= the integration capacitance (in farads)
I
IN
= the input current (in amperes)
t
= the integration time (in seconds)
Examples of Component Values for –10V Output
i
IN
(
μ
A)
t (s)
C
INT
(pF)
V
OUT
(V)
0.01
0.1
1
10
100
10
100
100m
10m
1m
100
μ
10
μ
1m
100
μ
100
100
100
100
100
1000
1000
–10
–10
–10
–10
–10
–10
–10
FIGURE 6. Capacitance of Circuit at Input of Integrator.
Sw Com
Sw Out
C
INTERNAL
Sensor
R
IN
C
IN
Out
Cap
In
Sw In
Com
NOISE
The total output noise for a specific application of the
ACF2101 is the rms total of the noise in the modes used:
Integrate noise (e
nI
), Hold noise (e
nH
) and Reset noise (e
nR
).
The noise in both the Hold (e
nH
) and Reset (e
nR
) modes is
10
μ
Vrms. The noise in the Integrate mode (e
nI
) is directly
proportional to one plus the ratio of C
IN
to C
INTEGRATION
,
where C
IN
is the capacitance of the circuit at the input of the
integrator and C
INTEGRATION
= C
INTERNAL
+ C
EXTERNAL
and
is the integration capacitance:
Integrate output noise (e
nI
) = (10
μ
Vrms)
x
(1 + C
IN
/C
INTEGRATION
)
Therefore, for very low C
IN
, the Integrate noise will ap-
proach 10
μ
Vrms. The total noise when in the Hold mode
after proceeding through Reset and Integrate modes is
approximated as shown below.
See Typical Performance Curve showing Total Output Noise
vs C
IN
and C
INTEGRATION
for more accurate noise data under
specific circumstances. If only the Integrate and Reset modes
are used, the total noise is the rms sum of the noise of the two
modes as shown below.
DYNAMIC CHARACTERISTICS
Frequency Response
The ACF2101 switched integrator is a sampled system
controlled by the sampling frequency (fs), which is usually
dominated by the integration time. Input signals above the
Nyquist frequency (fs/2) create errors by being aliased into
the sampled frequency bandwidth. The sampled frequency
bandwidth of the switched integrator has a –3dB character-
istic at fs/2.26 and a null at fs and harmonics 2fs, 3fs, 4fs,
etc. This characteristic is often used to eliminate known
interference.
C
INT
Total Noise
=
e
nI
2
+
e
nH
2
+
e
nR
2
Total Noise
=
e
nI
2
+
e
nR
2
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ACF2101BP | 制造商:BB 制造商全稱:BB 功能描述:Low Noise, Dual SWITCHED INTEGRATOR |
| ACF2101BU | 功能描述:運(yùn)算放大器 - 運(yùn)放 Low Noise Dual Swtc Integrator RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| ACF2101BU | 制造商:Texas Instruments 功能描述:IC OP-AMP SW INT 2MHZ DUAL 24SOIC 制造商:Texas Instruments 功能描述:IC, OP-AMP SW INT 2MHZ DUAL 24SOIC 制造商:Texas Instruments 功能描述:IC, OP-AMP SW INT 2MHZ DUAL 24SOIC; Op Amp Type:Low Noise; No. of Amplifiers:2; Slew Rate:3V/s; Supply Voltage Range:4.5V to 18V, -10V to -18V; Amplifier Case Style:SOIC; No. of Pins:24; Bandwidth:2MHz; Operating Temperature ;RoHS Compliant: Yes |
| ACF2101BU | 制造商:Texas Instruments 功能描述:LOW NOISE DUAL SWITCHED INTEGRATOR INTE |
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