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參數(shù)資料
| 型號： | INA2332AIPWT |
| 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)： | 12/17頁 |
| 文件大?。?/td> | 292K |
| 代理商： | INA2332AIPWT |
INA332, INA2332
SBOS216A
12
www.ti.com
OFFSET VOLTAGE ERROR CALCULATION
The offset voltage (V
OS
) of the INA332AIDGK is specified at
a maximum of 500
μ
V 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 pro-
vided to allow the user to easily calculate worst-case ex-
pected offset under the conditions of a given application.
Power-Supply Rejection Ratio (PSRR) is specified in
μ
V/V.
For the INA332, worst case PSRR is 200
μ
V/V, which means
for each volt of change in power supply, the offset may shift
up to 200
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 INA332, the worst case CMRR over the specified
common-mode range is 60dB (at G = 25) or about 30
μ
V/V
This means that for every volt of change in common-mode,
the offset will shift less than 30
μ
V.
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 ampli-
fier with a 3.3V supply with 1V common-mode. This configu-
ration varies from the specified configuration, representing 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
= 0.5mV + (1.7V
200
μ
V) + (0.65V
30
μ
V)
=
±
0.860mV
However, the typical value will be smaller, as seen in the
Typical Characteristics.
FEEDBACK CAPACITOR IMPROVES RESPONSE
For optimum settling time and stability with high-impedance
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 INA332
’
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.
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 INA332
’
s RG-pin input capacitance
(typically 3pF) plus the layout capacitance. The capacitor can
be varied until optimum performance is obtained.
FIGURE 8. Feedback Capacitor Improves Dynamic Perfor-
mance.
INA332
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 INA332
’
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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| INA240A1PWR | 功能描述:IC AMP CURRENT SENSE 8-TSSOP 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 放大器類型:電流檢測 電路數(shù):1 輸出類型:- 壓擺率:2 V/μs -3db 帶寬:400kHz 電流 - 輸入偏置:90μA 電壓 - 輸入失調(diào):5μV 電流 - 電源:1.8mA 電壓 - 電源，單/雙（±）:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商器件封裝:8-TSSOP 標(biāo)準(zhǔn)包裝:1 |
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