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參數(shù)資料
| 型號： | INA2322 |
| 元件分類： | 測量放大器 |
| 英文描述： | Precision Instrumentation Amplifier |
| 中文描述： | 精密儀表放大器 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 303K |
| 代理商： | INA2322 |
INA322
SBOS174
12
OFFSET VOLTAGE ERROR CALCULATION
The offset voltage (V
OS
) of the INA322EA has a specified
maximum of 10mV with a +5V power supply and the
common-mode voltage at V
S
/2. Additional specifications
for power-supply rejection and common-mode rejection are
provided to allow the user to easily calculate worst-case
expected offset under the conditions of a given application.
Power Supply Rejection Ratio (PSRR) is specified in
μ
V/V.
For the INA322, worst case PSRR is 250
μ
V/V, which
means for each volt of change in power supply, the offset
may shift up to 250
μ
V. Common-Mode Rejection Ratio
(CMRR) is specified in dB, which can be converted to
μ
V/V using the following equation:
CMRR (in
μ
V/V) = 10
[(CMRR in dB)/–20]
10
6
For the INA322, the worst case CMRR over the specified
common-mode range is 60dB (at G = 25) or about
1mV/V This means that for every volt of change in com-
mon-mode, the offset will shift less than 1mV.
These numbers can be used to calculate excursions from the
specified offset voltage under different application condi-
tions. For example, an application might configure the
amplifier with a 3.3V supply with 1V common-mode. This
configuration varies from the specified configuration, repre-
senting a 1.7V variation in power supply (5V in the offset
specification versus 3.3V in the application) and a 0.65V
variation in common-mode voltage from the specified
V
S
/2.
Calculation of the worst-case expected offset would be as
follows:
Adjusted V
OS
= Maximum specified V
OS
+
(power-supply variation) PSRR +
(common-mode variation) CMRR
V
OS
= 10mV + (1.7V 0.250mV/V) + (0.65V 1mV/V)
=
±
11.075mV
However, the typical value will be closer to 2.2mV (calcu-
lated using the typical values).
FEEDBACK CAPACITOR IMPROVES RESPONSE
For optimum settling time and stability with high-imped-
ance feedback networks, it may be necessary to add a
feedback capacitor across the feedback resistor, R
F
, as shown
in Figure 8. This capacitor compensates for the zero created
by the feedback network impedance and the INA322’s RG-
pin input capacitance (and any parasitic layout capacitance).
The effect becomes more significant with higher impedance
networks. Also, R
X
and C
L
can be added to reduce high-
frequency noise.
FIGURE 8. Feedback Capacitor Improves Dynamic Perfor-
mance.
It is suggested that a variable capacitor be used for the
feedback capacitor since input capacitance may vary be-
tween instrumentation amplifiers, and layout capacitance is
difficult to determine. For the circuit shown in Figure 8, the
value of the variable feedback capacitor should be chosen by
the following equation:
R
IN
C
IN
= R
F
C
F
Where C
IN
is equal to the INA322’s RG-pin input capaci-
tance (typically 3pF) plus the layout capacitance. The ca-
pacitor can be varied until optimum performance is ob-
tained.
INA322
V+
V
OUT
R
IN
R
IN
C
IN
= R
F
C
F
R
F
R
X
C
L
C
IN
Where C
is equal to the INA322
’
s input capacitance
(approximately 3pF) plus any parastic layout capacitance.
5
3
2
8
7
6
4
1
RG
Shutdown
V
IN
–
V
–
V
IN
+
REF
C
F
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA2322EA/250 | 功能描述:差分放大器 Micropwr Single-sply CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA2322EA/250G4 | 功能描述:差分放大器 Micropwr Single-sply CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA2322EA/2K5 | 功能描述:差分放大器 Micropwr Single-sply CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA2322EA/2K5G4 | 功能描述:差分放大器 Micropwr Single-sply CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA2322EA250 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:microPower, Single-Supply, CMOS NTATION AMPLIFIER |
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