參數(shù)資料
型號(hào)： INA145
元件分類： 差分放大器
英文描述： Programmable Gain DIFFERENCE AMPLIFIER
中文描述： 可編程增益差分放大器
文件頁(yè)數(shù)： 8/11頁(yè)
文件大?。?/td> 127K
代理商： INA145
8
INA145
APPLICATION INFORMATION
The INA145 is a programmable gain difference amplifier
consisting of a gain of 1 difference amplifier and a program-
mable-gain output buffer stage. Basic circuit connections are
shown in Figure 1. Power supply bypass capacitors should
be connected close to pins 4 and 7, as shown. The amplifier
is programmable in the range of G = 1 to G = 1000 with two
external resistors.
The output of A1 is connected to the noninverting input of
A2 through a 10k
resistor which is trimmed to
±
1%
absolute accuracy. The A2 input is available for applications
such as a filter or a precision current source. See application
figures for examples.
OPERATING VOLTAGE
The INA145 is fully specified for supply voltages from
±
2.25V to
±
18V, with key parameters guaranteed over the
temperature range –40
°
C to +85
°
C. The INA145 can be
operated with single or dual supplies, with excellent perfor-
mance. Parameters that vary significantly with operating
voltage, load conditions, or temperature are shown in the
typical performance curves.
SETTING THE GAIN
The gain of the INA145 is set by using two external
resistors, R
G1
and R
G2
, according to the equation:
G = 1 + R
G2
/R
G1
For a total gain of 1, A2 is connected as a buffer amplifier
with no R
G1
. A feedback resistor, R
G2
= 10k
, should be
used in the buffer connection. This provides bias current
cancellation (in combination with internal R
5
) to assure
specified offset voltage performance. Commonly used val-
ues are shown in the table of Figure 1. Resistor values for
other gains should be chosen to provide a 10k
parallel
resistance.
COMMON-MODE RANGE
The input resistors of the INA145 provides an input com-
mon-mode range that extends well beyond the power supply
rails. Exact range depends on the power supply voltage and
the voltage applied to the Ref terminal (pin 1). To assure
proper operation, the voltage at the non-inverting input of
A1 (an internal node) must be within its linear operating
range. Its voltage is determined by the simple 1:1 voltage
divider between pin 3 and pin 1. This voltage must be
between V– and (V+) – 1V.
FIGURE 1. Basic Circuit Connections.
A1
V
IN
INA145
V
O
R
2
40k
R
1
40k
V
IN
R
3
40k
R
4
40k
R
G1
R
G2
R
B
A2
V
01
7
3
2
5
4
1
8
6
–V
S
+V
S
0.1
μ
F
–
+
TOTAL GAIN
(V/V)
A2 GAIN
(V/V)
R
G1
(W)
R
G2
(W)
R
B
(W)
1
2
5
1
2
5
(None)
20k
12.4k
11.0k
10.5k
10.2k
10.2k
499
100
100
10k
20k
49.9k
100k
200k
499k
1M
100k
49.9k
100k
—
—
—
—
—
—
—
10
20
50
100
200
500
1000
10
20
50
100
200
500
1000
9.53k
10k
10k
STANDARD 1% RESISTORS
0.1
μ
F
V
O
= (V
IN
– V
IN
)(1 + R
G2
/R
G1
)
+
–
R
5
10k
(1%)
相關(guān)PDF資料
PDF描述
INA145UA CONN SMA PLUG RT/ANGL CRIMP GOLD
INA146 High-Voltage, Programmable Gain DIFFERENCE AMPLIFIER
INA146UA High-Voltage, Programmable Gain DIFFERENCE AMPLIFIER
INA148 【200V Common-Mode Voltage DIFFERENCE AMPLIFIER
INA148UA 【200V Common-Mode Voltage DIFFERENCE AMPLIFIER
相關(guān)代理商/技術(shù)參數(shù)
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INA145UA/2K5 功能描述:差分放大器 Programmable Gain 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(bǔ)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
INA145UA/2K5E4 功能描述:差分放大器 Programmable Gain 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(bǔ)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
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