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參數(shù)資料
| 型號(hào)： | INA155 |
| 元件分類： | 測(cè)量放大器 |
| 英文描述： | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| 中文描述： | 單電源，軌至軌，低成本儀表放大器 |
| 文件頁(yè)數(shù)： | 11/11頁(yè) |
| 文件大小： | 140K |
| 代理商： | INA155 |
11
INA155
INPUT COMMON-MODE RANGE
The input common-mode range of the INA155 for various
operating conditions is shown the in Typical Performance
Curves. The common-mode input range is limited by the
output voltage swing of A1, an internal circuit node. For the G
= 10 configuration, output voltage of A1 can be expressed as:
V
OUTA1
= –
1
/
9
V
REF
+ (1 +
1
/
9
) V
IN
–
(2)
Using this equation given that the output of A1 can swing to
within 10mV of either rail, the input common-mode voltage
range can be calculated. When the input common-mode range
is exceeded (A1’s output is saturated), A2 can still be in linear
operation and respond to changes in the non-inverting input
voltage. However, the output voltage will be invalid.
The common-mode range for the G = 50 configuration is
included in the Typical Performance Curve, “Input Com-
mon-Mode Range vs Output Voltage.”
INPUT RANGE FOR BEST ACCURACY
The internal amplifiers have rail-to-rail input stages, achieved
by using complementary n- and p-channel input pairs. The
common-mode input voltage determines whether the
p-channel or the n-channel input stage is operating. The
transition between the input stages is gradual and occurs
between (V+) – 1.8V to (V+) – 0.8V. Due to these charac-
teristics operating the INA155 with input voltages within the
transition region of (V+) – 1.8V to (V+) – 0.8V results in a
shift in input offset voltage and reduced common-mode and
power supply rejection performance. Typical patterns of the
offset voltage change throughout the input common-mode
range are illustrated in Figure 6. The INA155 can be
operated below or above the transition region with excellent
results. Figure 7 demonstrates the use of the INA155 in a
single-supply, high-side current monitor. In this applica-
tion, the INA155 is operated above the transition region.
RAIL-TO-RAIL OUTPUT
A class AB output stage with common-source transistors
is used to achieve rail-to-rail output. For resistive loads
greater than 10k
, 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 Out-
put Current.” The INA155’s low output impedance at high
frequencies makes it suitable for directly driving Capaci-
tive Digital-to-Analog (CDAC) input A/D converters, as
shown in Figure 9.
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 on the input
pins is limited to 10mA. This is easily accomplished with
input resistors R
LIM
as shown in Figure 8. Many input
signals are inherently current-limited to less than 10mA,
therefore, a limiting resistor is not required.
FIGURE 6. Input Offset Voltage Changes with Common-
Mode Voltage.
FIGURE 7. Single-Supply, High-Side Current Monitor.
FIGURE 8. Input Current Protection for Voltages Exceed-
ing the Supply Voltage.
Input Common-Mode Voltage (V)
I
0.0
0.5
1.0
2.5
3.0
1.5
2.0
1.00
0.80
0.60
0.40
0.20
0.00
–0.20
–0.40
–0.60
–0.80
–0.100
3.5
4.0
5.5
4.5
5.0
TrRegion
P-Channel Operation
V
S
= –1.8V
V
S
= 5.5V
V
S
= –0.8V
Operation
FIGURE 9. INA155 Directly Drives Capacitive-Input,
High-Speed A/D Converter.
INA155
5
V
OUT
V
REF
R
LIM
R
LIM
I
10mA max
3
6
2
1
8
+5V
INA155
ADS7818
or
ADS7834
12-Bits
f
SAMPLE
= 500kHz
6
7
4
4
2
3
NOTE: G = 10 configuration
1
8
INA155
7
6
4
5
I
L
2.5A
G = 10
Pins 1 and 8 Open
V+
NOTE: Output is referred to V+.
2
3
1
8
0.02
Load
50mV
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA155E | 制造商:BB 制造商全稱:BB 功能描述:Single-Supply, Rail-to-Rail Output, CMOS INSTRUMENTATION AMPLIFIER |
| INA155E/250 | 功能描述:儀表放大器 R/R CMOS Inst RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| INA155E/250G4 | 功能描述:儀表放大器 Single-Sply R-to-R Output CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| INA155E/2K5 | 功能描述:儀表放大器 Single-Sply R-to-R Output CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| INA155E/2K5G4 | 功能描述:儀表放大器 Single-Sply R-to-R Output CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
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