- 您现在的位置：买卖IC网 > PDF目录2157 > MAX4208AUA+T (Maxim Integrated Products)IC INSTRUMENT AMP PREC 8-UMAX PDF资料下载
参数资料
| 型号： | MAX4208AUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/17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
14
______________________________________________________________________________________
Power-Supply Bypass and Layout
Good layout technique optimizes performance by
decreasing the amount of stray capacitance at the
instrumentation amplifier’s gain-setting pins (OUT, FB,
and REF). Excess capacitance produces peaking in
the amplifier’s frequency response. To decrease stray
capacitance, minimize trace lengths by placing exter-
nal components as close as possible to the instrumen-
tation amplifier. Unshielded long traces at the inputs of
the instrumentation amplifier degrade the CMRR and
pick-up noise. This produces inaccurate output in high-
gain configurations. Use shielded or coax cables to
connect the inputs of the instrumentation amplifier.
Since the MAX4208/MAX4209 feature ultra-low input
offset voltage, board leakage and thermocouple effects
can easily introduce errors in the input offset voltage
readings when used with high-impedance signal
sources. Minimize board leakage current and thermo-
couple effects by thoroughly cleaning the board and
placing the matching components very close to each
other and with appropriate orientation. For best perfor-
mance, bypass each power supply to ground with a
separate 0.1F capacitor.
For noisy digital environments, the use of multilayer
PCB with separate ground and power-supply planes is
recommended. Keep digital signals far away from the
sensitive analog inputs.
Refer to the MAX4208 or MAX4209 Evaluation Kit data
sheets for good layout examples.
Low-Side Current-Sense Amplifier
The use of indirect current-feedback architecture
makes the MAX4208/MAX4209 ideal for low-side cur-
rent-sensing applications, i.e., where the current in the
circuit ground needs to be measured by means of a
small sense resistor. In these situations, the input com-
mon-mode voltage is allowed to be at or even slightly
below ground (VSS - 0.1V).
If the currents to be measured are bidirectional, con-
nect REFIN/MODE to VDD/2 to get full dynamic range
for each direction. If the currents to be measured are
unidirectional, both REFIN/MODE and REF can be tied
to GND. However, VOL limitations can limit low-current
measurement. If currents need to be measured down to
0A, bias REFIN/MODE to a voltage above 0.2V to acti-
vate the internal buffer and to stay above amplifier VOL,
and measure both OUT and REF with a differential
input ADC.
Low-Voltage, High-Side
Current-Sense Amplifier
Power management is a critical area in high-perfor-
mance portable devices such as notebook computers.
Modern digital processors and ASICs are using smaller
transistor geometries to increase speed, reduce size,
and also lower their operating core voltages (typically
0.9V to 1.25V). The MAX4208/MAX4209 instrumentation
amplifiers can be used as a nearly zero voltage-drop,
current-sense amplifier (see Figure 5).
VCM
VCC
VCM-MAX
3/4 VCC
1/2 VCC
1/4 VCC
0
VCC/2
VCC
VOUT
( = GAIN x VDIFF + VREF)
VREF = 1/2 VCC
CLASSIC THREE OP-AMP INA
VCM
VDD
VCM-MAX
0
VDD/2
VDD
VOUT
( = GAIN x VDIFF + VREF)
VREF = 1/2 VDD
MAX4208/MAX4209
Figure 3. Limited Common Mode vs. Output Voltage of a
Three Op-Amp INA
Figure 4. Input Common Mode vs. Output Voltage of
MAX4208/MAX4209 Includes 0V (GND)
相关PDF资料 |
PDF描述 |
|---|---|
| MAX420CPA+ | IC OPAMP CMOS CHOPPER-STAB 8-DIP |
| MAX4217EUA+ | IC BUFFER R-R W/ENABLE 8-UMAX |
| MAX4218EEE+T | IC OP AMP R-R W/ENABLE 16QSOP |
| MAX4228ESD+ | IC AMP CURRENT FB LP 14-SOIC |
| MAX4234AUD/V+ | IC OPAMP I/O R-R 10MHZ 14-TSSOP |
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 |
发布紧急采购，3分钟左右您将得到回复。