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| 型号： | MAX4208AUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/17页 |
| 文件大小： | 0K |
| 描述： | IC INSTRUMENT AMP PREC 8-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.08 V/µs |
| 增益带宽积： | 750kHz |
| 电流 - 输入偏压： | 1pA |
| 电压 - 输入偏移： | 3µV |
| 电流 - 电源： | 1.4mA |
| 电流 - 输出 / 通道： | 25mA |
| 电压 - 电源，单路/双路(±)： | 2.85 V ~ 5.5 V，±1.425 V ~ 2.25 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
MAX4208/MAX4209
Ultra-Low Offset/Drift, Precision
Instrumentation Amplifiers with REF Buffer
12
______________________________________________________________________________________
In a conventional instrumentation amplifier, a simple
method to apply a reference voltage is the use of a volt-
age-divider to set the REF level (often halfway between
ground and VDD). The voltage-divider should be made
of higher value resistors to minimize current consump-
tion, but the sinking and sourcing current from the load
and gain-setting resistors create a significant common-
mode signal at the divider midpoint. The MAX4208/
MAX4209 precision REFIN buffer essentially eliminates
the error voltage at REF.
The REFIN buffer is a unity-gain op amp that has a guar-
anteed VOS of less than 40V with a CMOS input bias
current of only 1pA, to allow setting REFIN with a simple
resistive divider with minimum errors.
REFIN/MODE is a triple function input (see Table 1). To
use the internal REFIN buffer, connect REFIN/MODE to
an external reference or a simple resistive divider at
any voltage between (VSS + 0.2V) and (VDD - 1.3V).
These voltages represent the minimum and maximum
for the REFIN buffer’s input common-mode range (see
the Electrical Characteristics table). To use ground at
REF or to use an external low-impedance reference
directly at REF without the internal REFIN buffer, con-
nect REFIN/MODE to VSS. This disables the REFIN
buffer, dropping the IDD to 750A and puts the REFIN
buffer output in a high-impedance state to allow exter-
nal direct drive of REF. To put the MAX4208/MAX4209
into shutdown and reduce the supply current to less
than 5A, drive REFIN/MODE to VDD.
Note: When driving REF directly, REFIN/MODE must be
at VSS and shutdown mode is NOT available.
Input Differential Signal Range
The MAX4208/MAX4209 feature a proprietary input
structure optimized for small differential signals of up to
±100mV. The output of the MAX4208/MAX4209 allows
for bipolar input signals. The output voltage is equal to
the voltage at REF for zero differential input. The gain
accuracy of these devices is laser trimmed to better
than 0.1% (typ).
Output Swing
The MAX4208/MAX4209 are designed specifically for
small input signals (±100mV) from sensors, strain
gauges, etc. These instrumentation amplifiers are
capable of rail-to-rail output-voltage swings; however,
depending on the selected gain and REF level, the rail-
to-rail output swing may not be required or desired.
For example, consider single-supply operation of the
MAX4208 in a unity-gain configuration with REF con-
nected to a voltage at half of the supply voltage (VDD /
2). In this case, the output-voltage swing would be
±100mV around the REF level and would not need to
reach either rail.
Another example is the MAX4209H (gain internally set
to 100) also operating with a single-supply voltage and
REF set externally to ground (VSS). REFIN/MODE must
also be connected to ground (VSS). In this case, an
input voltage of 0 to 10mV differential would ideally
drive an output-voltage swing of 0 to 1V. However, the
output swing can only get to within 40mV of ground
(VSS) (see the VOL specifications in the Electrical
Characteristics table). It is recommended that for best
accuracy and linearity, the lowest differential input volt-
age for unipolar operation is usually picked to be a
nonzero value (e.g., 0.5mV or more).
Another remedy is to use REFIN/MODE of 250mV (see
the REFIN/MODE Buffered Reference Input Range in the
Electrical Characteristics table), which causes a 0 to
100mV input to start OUT at 250mV and swing to 1.25V,
to prevent the output from going into its bottom nonlinear
range. An ADC with differential input can be connected
between OUT and REF to record the true 0 to 1V swing.
Devices with higher gain and bipolar output swing can
be configured to approach either rail for maximum
dynamic range. However, as the output approaches with-
in VOL or VOH of the supply voltages, the linearity and
accuracy degrades, especially under heavy loading.
Table 1. REFIN/MODE Pin Functions
REFIN/MODE VOLTAGE*
STATE OF MAX4208/MAX4209 and REFIN BUFFER
VDD (typically +5V)
The entire IC is in SHDN mode and draws 1.4A of supply current.
Between VSS + 200mV and
(VDD - 1.3V)
The internal REF buffer is activated. REF MUST NOT be fed by any external source. The voltage
at REFIN/MODE is transferred to REF within ±40V, max (VOS of the internal REF buffer).
VSS (typically ground)
The internal REF buffer is OFF with its output in a high-impedance state to allow direct drive of
REF (or connection to ground). REF must be directly connected to an external voltage reference
capable of sinking and sourcing the load current.
*See the Electrical Characteristics table for detailed specifications.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4208EVKIT+ | 功能描述:放大器 IC 开发工具 MAX4208 Eval Kit RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX4209EVKIT+ | 功能描述:放大器 IC 开发工具 MAX4209 Eval Kit RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX4209HAUA+ | 功能描述:仪表放大器 Low Offset/Drift Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
| MAX4209HAUA+T | 功能描述:仪表放大器 Low Offset/Drift Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
| MAX420C/D | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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