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參數(shù)資料
| 型號： | MAX4208 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Ultra-Low Offset/Drift, Precision Instrumentation Amplifiers with REF Buffer |
| 中文描述： | 超低失調(diào)/漂移、高精度儀表放大器，提供REF緩沖器 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 263K |
| 代理商： | MAX4208 |
M
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
______________________________________________________________________________________
11
Detailed Description
The MAX4208/MAX4209 family of instrumentation ampli-
fiers implements a patented spread-spectrum, autozero-
ing technique that minimizes the input offset error, drift
over time and temperature, and the effect of 1/f noise.
Unlike the traditional three-op amp instrumentation
amplifier, this technique allows true ground-sensing
capability combined with a low input bias current and
increased common-mode rejection.
The differential input signal is converted to a current by
an input transconductance stage. An output transcon-
ductance stage converts a portion of the output voltage
(equal to the output voltage divided by the gain) into
another precision current. These two currents are sub-
tracted and the result is fed to a loop amplifier with suffi-
cient gain to minimize errors (Figures 1 and 2). The
MAX4209 has factory-trimmed gains of 10V/V, 100V/V,
and 1000V/V. The MAX4208 has an adjustable gain, set
with an external pair of resistors between OUT, FB, and
REF (Figure 1). The MAX4208/MAX4209 have an output
reference input (REF) that is connected to an external ref-
erence for bipolar operation of the device. For single-sup-
ply operation, the range for V
REF
is 0V to (V
DD
- 1.3V).
Although full output-swing capability and maximum sym-
metrical dynamic range is obtained at REF = V
DD
/2, the
optimal V
REF
setting depends on the supply voltage and
output-voltage swing needed by the application. The
maximum recommended differential input voltage is
±100mV. Linearity and accuracy are degraded above
that level. The MAX4208/MAX4209 operate with single
2.85V to 5.5V supply voltages or dual ±1.425V to ±2.75V
supplies.
The MAX4208/MAX4209 have a shutdown feature to
reduce the supply current to 1.4μA (typ) when REFIN/
MODE is connected to V
DD
.
REF, REFIN/MODE, and Internal REFIN
Buffer of the MAX4208/MAX4209
In a single-supply system, bipolar operation of an
instrumentation amplifier requires the application of a
voltage reference (REF) to set the output voltage level
when a zero differential voltage is applied to the input.
The output swing is around this reference level, which
is usually set to half of the supply voltage for the largest
swing and dynamic range.
In many instrumentation amplifiers, the gain-setting
resistors as well as the R
L
are connected between OUT
and REF. OUT can sink and source current but the
need for REF to sink and source current is often over-
looked and can lead to significant errors. Therefore, the
MAX4208/MAX4209 include a REFIN buffer, an internal,
precision unity-gain buffer on-chip to sink and source the
currents needed at REF without loading the reference
voltage supplied at REFIN/MODE.
MAX4208
g
m
g
m
AMP
SHDN
+1
OUT
FB
REF
REFIN/MODE
R2
R1
IN-
IN+
V
DD
V
SS
G = 1 +R2
R1
Figure 1. MAX4208 Functional Diagram
MAX4209
g
m
g
m
AMP
SHDN
+1
OUT
FB
REF
REFIN/MODE
R2
R1
IN-
IN+
V
DD
V
SS
G = 1 +R2
R1
Figure 2. MAX4209 Functional Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4209 | Ultra-Low Offset/Drift, Precision Instrumentation Amplifiers with REF Buffer |
| MAX4215ESA | High-Speed, Single-Supply, Gain of @, Closed-Loop, Rail-to-Rail Buffers with Enable |
| MAX4219EEE | High-Speed, Single-Supply, Gain of @, Closed-Loop, Rail-to-Rail Buffers with Enable |
| MAX4217ESA | High-Speed, Single-Supply, Gain of @, Closed-Loop, Rail-to-Rail Buffers with Enable |
| MAX4214 | High-Speed, Single-Supply, Gain of @, Closed-Loop, Rail-to-Rail Buffers with Enable |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4208AUA+ | 功能描述:儀表放大器 Low Offset/Drift Instrumentation Amp 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 |
| MAX4208AUA+T | 功能描述:儀表放大器 Low Offset/Drift Instrumentation Amp 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 |
| MAX4208EVKIT+ | 功能描述:放大器 IC 開發(fā)工具 MAX4208 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX4209EVKIT+ | 功能描述:放大器 IC 開發(fā)工具 MAX4209 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX4209HAUA+ | 功能描述:儀表放大器 Low Offset/Drift Instrumentation Amp 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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