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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)： | 10/15頁 |
| 文件大?。?/td> | 270K |
| 代理商： | INA327IDGST |
INA326, INA327
SBOS222
10
www.ti.com
INPUT COMMON-MODE RANGE
Common instrumentation amplifiers do not respond linearly
with common-mode signals near the power-supply rails, even
if
“
rail-to-rail
”
op amps are used. The INA326 uses a unique
topology to achieve true rail-to-rail input behavior (see
“
Inside
the INA326
”
). The linear input voltage range of each input
terminal extends to 20mV beyond the rails.
The INA326 uses a new, unique internal circuit topology
that provides true rail-to-rail input. Unlike other instrumen-
tation amplifiers, it can linearly process inputs up to 20mV
beyond the power-supply rails. Conventional instrumenta-
tion amplifier circuits cannot deliver such performance,
even if rail-to-rail op amps are used.
The ability to reject common-mode signals is derived in
most instrumentation amplifiers through a combination of
amplifier CMR and accurately matched resistor ratios. The
INA326 converts the input voltage to a current. Current-
mode signal processing provides rejection of common-
mode input voltage and power supply variation without
accurately matched resistors.
A simplified diagram shows the basic circuit function. The
differential input voltage, V
IN
+
–
V
IN
–
is applied across R
1
.
The signal-generated current through R
1
comes from A1
and A2
’
s output stages. A2 combines the current in R
1
with a mirrored replica of the current from A1. The result-
ing current in A2
’
s output and associated current mirror is
two times the current in R
1
. This current flows in (or out)
of pin 5 into R
2
. The resulting gain equation is:
G
R
R
=
2
2
1
Amplifiers A1, A2 and their associated mirrors are pow-
ered from internal charge-pumps that provide voltage
supplies that are beyond the positive and negative supply
rails. As a result, the voltage developed on R
2
can actually
swing 20mV beyondthe external power supply rails. A3
provides a buffered output of the voltage on R
2
. A3
’
s input
stage is also operated from the charge-pumped power
supplies for true rail-to-rail operation.
FIGURE 4. Simplified Circuit Diagram.
INSIDE THE INA326
INPUT PROTECTION
The inputs of the INA326 are protected with internal diodes
connected to the power-supply rails. These diodes will clamp
the applied signal to prevent it from damaging the input
circuitry. If the input signal voltage can exceed the power
supplies by more than 0.5V, the input signal current should
be limited to less than 10mA to protect the internal clamp
diodes. This can generally be done with a series input
resistor. Some signal sources are inherently current-limited
and do not require limiting resistors.
A1
V+
V
–
Current Mirror
Current Mirror
I
R1
I
R1
I
R1
R
1
R
2
C
2
V
O
V
IN
–
V
IN+
I
R1
2I
R1
2I
R1
2I
R1
2I
R1
2I
R1
A3
A2
IA
COMMON
0.1
μ
F
Current Mirror
Current Mirror
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| INA330AIDGSRG4 | 功能描述:差分放大器 Thermistor Signal for Temp Control 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 |
| INA330AIDGST | 功能描述:差分放大器 Thermistor Signal for Temp Control 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 |
| INA330AIDGST | 制造商:Texas Instruments 功能描述:IC AMP INST SMD VSSOP10 330 |
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