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參數(shù)資料
| 型號： | INA327IDGST |
| 元件分類： | 測量放大器 |
| 英文描述： | INSTRUMENTATION AMPLIFIER|SINGLE|CMOS|TSSOP|10PIN|PLASTIC |
| 中文描述： | 儀表放大器|單|的CMOS | TSSOP封裝| 10PIN |塑料 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 270K |
| 代理商： | INA327IDGST |
INA326, INA327
SBOS222
11
www.ti.com
FIGURE 5. Output Range Pedestal.
FIGURE 6. High-Side Shunt Measurement of Current Load.
FIGURE 7. Low-Side Shunt Measurement of Current Load.
REF
/2.
FIGURE 9. Output from Pin 5 to Allow Swing Beyond the Rail.
FILTERING
Filtering can be adjusted through selection of R
2
C
2
and
R
O
C
O
for the desired tradeoff of noise and bandwidth. Adjust-
ment of these components will result in more or less ripple
due to auto-correction circuitry noise and will also affect
broadband noise. Filtering limits slew rate, settling time, and
output overload recovery time.
It is generally desirable to keep the resistance of R
O
relatively
low to avoid DC gain error created by the subsequent stage.
This may result in relatively high values for C
O
to produce the
desired filter response. The impedance of R
O
C
O
can be
scaled higher to produce smaller capacitor values if the load
impedance is very high.
Certain capacitor types greater than 0.1
μ
F may have dielec-
tric absorption effects that can significantly increase settling
time in high-accuracy applications (settling to 0.01%). Polypro-
pylene, polystyrene, and polycarbonate types are generally
good. Certain
“
high-K
”
ceramic types may produce slow
settling
“
tails.
”
Settling time to 0.1% is not generally affected
by high-K ceramic capacitors. Electrolytic types are not
recommended for C
2
and C
O
.
R
1
R
′
2
5
R
0
R
2
C
2
C
0
V
REF
= 10V to 5V
G = 2 (R
2
|| R
′
2
)/R
1
INA326
R
and R
′
are chosen to
create a small pedestal
voltage (e.g., 100mV).
Gain is determined by
the parallel combination
of R
2
and R
′
2
.
INA326
+5V
I
L
5
R
O
R
S
R
1
R
2
C
2
C
O
NOTE: Connection point
of V+ will include ( ) or
exclude ( ) quiescent
current in the measurement
as desired. Output pedestal
required for measurements
near zero (see Figure 5).
R
must be chosen
so that the input voltage
does not exceed 20mV
beyond the rail.
INA326
+5V
I
L
R
S
R
O
5
C
2
C
O
R
2
R
1
NOTE: Connection point of V
–
will include ( ) or
exclude ( ) quiescent current in the measurement
as desired. Output pedestal required for measurements
near zero (see Figure 5).
R
must be chosen so that
the input voltage does not
exceed 20mV beyond the rail.
2k
200k
200k
V
REF
R
O
5
C
O
C
2
V
REF
INA326
A/D
Converter
G = 2(200k
|| 200k
)/2k
= 100
INA326
+5V
NC
(1)
+15V
–
15V
OPA277
V
D
C
2
R
2
R
1
V
CM
5
(2)
NOTE: (1) NC denotes No Connection.
(2) Typical swing capability
–
20mV to +5V + 20mV.
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