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參數(shù)資料
| 型號： | MAX4197 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 運動控制電子 |
| 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 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 213K |
| 代理商： | MAX4197 |
M
Mic ropower, S ingle-S upply, Rail-to-Rail,
Prec ision Instrumentation Amplifiers
_______________________________________________________________________________________
9
V
CM
vs. V
OUT
Charac terization
Figure 4 illustrates the MAX4194 typical common-mode
input voltage range over output voltage swing at unity-
gain (pins 1 and 8 left floating), with a single-supply
voltage of V
CC
= +5V and a bias reference voltage of
V
REF
= V
CC
/2 = +2.5V. Points A and D show the full
input voltage range of the input amplifiers (V
EE
+ 0.2V
to V
CC
- 1.1V) since, with +2.5V output, there is zero
input differential swing. The other points (B, C, E, and
F) are determined by the input voltage range of the
input amps minus the differential input amplitude nec-
essary to produce the associated V
OUT
. For the higher
gain configurations, the V
CM
range will increase at the
endpoints (B, C, E, and F) since a smaller differential
voltage is necessary for the given output voltage.
Rail-to-Rail Output S tage
The MAX4194–MAX4197’s output stage incorporates a
common-source structure that maximizes the dynamic
range of the instrumentation amplifier.
The output can drive up to a 25k
(tied to V
CC
/2) resis-
tive load and still typically swing within 30mV of the
rails. With an output load of 5k
tied to V
CC
/2, the out-
put voltage swings within 100mV of the rails.
S hutdown Mode
The MAX4195–MAX4197 feature a low-power shutdown
mode. When the shutdown pin (
SHDN
) is pulled low,
the internal amplifiers are switched off and the supply
current drops to 8μA typically (Figures 5a, 5b, and 5c).
This disables the instrumentation amplifier and puts its
output in a high-impedance state. Pulling
SHDN
high
enables the instrumentation amplifier.
Applic ations Information
S etting the Gain (MAX 4194)
The MAX4194’s gain is set by connecting a single,
external gain resistor between the two RG pins (pin 1
and pin 8), and can be described as:
G = 1 + 50k
/ R
G
where G is the instrumentation amplifier’s gain and R
G
is the gain-setting resistor.
The 50k
resistor of the gain equation is the sum of the
two resistors internally connected to the feedback loops
of the IN+ and IN- amplifiers. These embedded feed-
back resistors are laser trimmed, and their accuracy
and temperature coefficients are included in the gain
and drift specification for the MAX4194.
0
1
3
2
4
5
0
2
1
3
4
5
OUTPUT VOLTAGE (V)
C
B
C
0.03
4.97
D
A
F
E
MAX4194/MAX4195
G = +1V/V
REF = +2.5V/+1.5V
V
CC
= +5V/+3V
V
EE
= 0
T
A
= +25
°
C
SHDN
(5V/div)
MAX4195
OUT
AC-COUPLED
(V
DIFF
= 2V,
G = +1V/V)
(500mV/div)
50
μ
s/div
Figure 4. Common-Mode Input Voltage vs. Output Voltage
Figure 5a. MAX4195 Shutdown Mode
*Leave pins 1 and 8 open for G = +1V/V.
GAIN (V/V)
CLOSEST R
G
(1%)
(
)
∞
*
49.9k
12.4k
5.62k
2.61k
1.02k
511
249
100
49.9
24.9
10
4.99
CLOSEST R
G
(5%)
(
)
∞
*
51k
12k
5.6k
2.7k
1.0k
510
240
100
51
24
10
5.1
+1
+2
+5
+10
+20
+50
+100
+200
+500
+1,000
+2,000
+5,000
+10,000
Table 1. MAX4194 External Gain Resistor
Selection
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4197ESA | 功能描述:儀表放大器 uPower Single-Supply Rail-Rail Precision RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補償電壓: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 |
| MAX4197ESA+ | 功能描述:儀表放大器 uPower Single-Supply Rail-Rail Precision RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補償電壓: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 |
| MAX4197ESA+T | 功能描述:儀表放大器 uPower Single-Supply Rail-Rail Precision RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補償電壓: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 |
| MAX4197ESA-T | 功能描述:儀表放大器 uPower Single-Supply Rail-Rail Precision RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補償電壓: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 |
| MAX4198 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Micropower, Single-Supply, Rail-to-Rail Precision Differential Amplifiers |
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