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參數資料
| 型號： | MAX4209HAUA+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 3/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC INSTRUMENT AMP PREC 8-UMAX |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 放大器類型： | 儀表 |
| 電路數： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉換速率： | 0.055 V/µs |
| -3db帶寬： | 7.5kHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 3µV |
| 電流 - 電源： | 1.4mA |
| 電流 - 輸出 / 通道： | 25mA |
| 電壓 - 電源，單路/雙路(±)： | 2.85 V ~ 5.5 V，±1.425 V ~ 2.25 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-uMAX |
| 包裝： | 帶卷 (TR) |
MAX4208/MAX4209
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
______________________________________________________________________________________
11
Detailed Description
The MAX4208/MAX4209 family of instrumentation ampli-
fiers implements a spread-spectrum, autozeroing tech-
nique 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 com-
bined with a low input bias current and increased com-
mon-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 a factory-trimmed gain of 100V/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 reference for bipo-
lar operation of the device. For single-supply operation,
the range for VREF is 0V to (VDD - 1.3V). Although full out-
put-swing capability and maximum symmetrical dynamic
range is obtained at REF = VDD/2, the optimal VREF set-
ting depends on the supply voltage and output-voltage
swing needed by the application. The maximum recom-
mended 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 1.4A (typ) when REFIN/
MODE is connected to VDD.
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 RL 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
gm
AMP
SHDN
+1
OUT
FB
REF
REFIN/MODE
R2
R1
IN-
IN+
VDD
VSS
G = 1 +
R2
R1
Figure 1. MAX4208 Functional Diagram
MAX4209
gm
AMP
SHDN
+1
OUT
FB
REF
REFIN/MODE
R2
R1
IN-
IN+
VDD
VSS
G = 1 +
R2
R1
Figure 2. MAX4209 Functional Diagram
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX420C/D | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX420CPA | 功能描述:運算放大器 - 運放 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX420CPA+ | 功能描述:運算放大器 - 運放 Chopper Stabilized RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX420CPA-101 | 制造商:Maxim Integrated Products 功能描述: |
| MAX420CTV | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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