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參數(shù)資料
| 型號： | INA322 |
| 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)： | 11/15頁 |
| 文件大?。?/td> | 303K |
| 代理商： | INA322 |
INA322
SBOS174
11
SHUTDOWN MODE
The shutdown pin of the INA322 is nominally connected to
V+. When the pin is pulled below 0.8V on a 5V supply, the
INA322 goes into sleep mode within nanoseconds.
For actual shutdown threshold, see typical performance curve
“Shutdown Voltage vs Supply Voltage”. Drawing less than
1
μ
A of current, and returning from sleep mode in microsec-
onds, the shutdown feature is useful for portable applications.
Once in ‘sleep-mode’ the amplifier has high output imped-
ance, making the INA322 suitable for multiplexing.
RAIL TO RAIL OUTPUT
A class AB output stage with common-source transistors is
used to achieve rail-to-rail output for gains of 10 or greater.
When the amplifier is in G = 5 the output will not swing to
positive rail. For resistive loads greater than 25k
, the
output voltage can swing to within a few millivolts of the
supply rail while maintaining low gain error. For heavier
loads and over temperature, see the typical performance
curve “Output Voltage Swing vs Output Current.” The
INA322’s low output impedance at high frequencies makes
it suitable for directly driving Capacitive Digital-to-Analog
(CDAC) input A/D converters, as shown in Figure 5.
OUTPUT BUFFERING
The INA322 is optimized for a load impedance of 10k
or
greater. For higher output current the INA322 can be buff-
ered using the OPA340, as shown in Figure 4. The OPA340
can swing within 50mV of the supply rail, driving a 600
load. The OPA340 is available in the tiny MSOP-8 package.
OFFSET TRIMMING
In the event that external offset adjustment is required, the
offset can be adjusted by applying a correction voltage to the
reference terminal. Figure 6 shows an optional circuit for
trimming offset voltage. The voltage applied to the REF
terminal is added to the output signal. The gain from REF to
V
OUT
is +1. An op-amp buffer is used to provide low
impedance at the REF terminal to preserve good common-
mode rejection.
FIGURE 4. Output Buffering Circuit. Able to drive loads
as low as 600
.
INPUT PROTECTION
Device inputs are protected by ESD diodes that will conduct
if the input voltages exceed the power supplies by more than
500mV. Momentary voltages greater than 500mV beyond
the power supply can be tolerated if the current through the
input pins is limited to 10mA. This is easily accomplished
with input resistor R
LIM
, as shown in Figure 7. Many input
signals are inherently current-limited to less than 10mA,
therefore, a limiting resistor is not required.
FIGURE 6. Optional Offset Trimming Voltage.
FIGURE 5. INA322 Directly Drives a Capacitive-Input,
A/D Converter.
FIGURE 7. Input Protection.
OPA340
V
OUT
+5V
0.1
μ
F
0.1
μ
F
INA322
5
3
2
V
OUT
8
7
6
4
1
V+
Shutdown
RG
V
IN
–
V
IN
+
REF
ADS7818
or
ADS7822
12-Bits
+5V
INA322
5
3
2
V
OUT
8
7
6
4
V
–
1
V+
Shutdown
RG
V
IN
–
V
IN
+
REF
f
S
< 100kHz
OPA336
Adjustable
Voltage
INA322
5
3
2
V
OUT
8
7
6
4
1
V+
Shutdown
RG
V
IN
–
V
–
V
IN
+
REF
(1)
NOTE: (1) REF should be adjusted for the desired output level.
The value of REF affects the common-mode input range.
R
LIM
R
LIM
I
10mA max
INA322
5
3
2
V
OUT
8
7
6
4
1
V+
Shutdown
RG
V
IN
–
V
–
V
IN
+
REF
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