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| 型号： | MAX4462HETT+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC INSTR AMP SGL R-R 6-TDFN |
| 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： | 0.25 V/µs |
| 增益带宽积： | 2.5MHz |
| -3db带宽： | 25kHz |
| 电流 - 输入偏压： | 1pA |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 800µA |
| 电流 - 输出 / 通道： | 150mA |
| 电压 - 电源，单路/双路(±)： | 2.85 V ~ 5.25 V，±1.425 V ~ 2.125 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WDFN 裸露焊盘 |
| 供应商设备封装： | 6-TDFN 裸露焊盘（3x3） |
| 包装： | 带卷 (TR) |
MAX4460/MAX4461/MAX4462
SOT23, 3V/5V, Single-Supply, Rail-to-Rail
Instrumentation Amplifiers
16
______________________________________________________________________________________
Applications Information
Setting the Gain (MAX4460)
The MAX4460 gain is set by connecting a resistive-
divider from OUT to GND, with the center tap connect-
ed to FB (Figure 2). The gain is calculated by:
Gain = 1 + R2 / R1
Because FB has less than 100pA IB, high-valued resis-
tors can be used without significantly affecting the gain
accuracy. The sum of resistors (R1 + R2) near 100k
is
a good compromise. Resistor accuracy directly affects
gain accuracy. Resistor sum less than 20k
should not
be used because their loading can slightly affect output
accuracy.
Capacitive-Load Stability
The MAX4460/MAX4461/MAX4462 are capable of dri-
ving capacitive loads up to 100pF.
Applications needing higher capacitive drive capability
may use an isolation resistor between OUT and the
load to reduce ringing on the output signal. However
this reduces the gain accuracy due to the voltage drop
across the isolation resistor.
Output Loading
For best performance, the output loading should be to
the potential seen at REF for the MAX4462 or to ground
for the MAX4460/MAX4461.
REF Input (MAX4462)
The REF input of the MAX4462 can be connected to any
voltage from (VSS + 0.1V) to (VDD - 1.7V). A buffered
voltage-divider with sink and source capability works
well to center the output swing at VDD/2. Unbuffered
resistive dividers should be avoided because the 100k
(typ) input impedance of REF causes amplitude-depen-
dent variations in the divider’s output.
Bandgap references, either series or shunt, can be
used to drive REF. This provides a voltage and temper-
ature invariant reference. This same reference voltage
can be used to bias bridge sensors to eliminate supply
voltage ratiometricity. For proper operation, the refer-
ence must be able to sink and source at least 25A.
In many applications, the MAX4462 is connected to a
CODEC or other device with a reference voltage out-
put. In this case, the receiving device’s reference out-
put makes an ideal reference voltage. Verify the
reference output of the device is capable of driving the
MAX4462’s REF input.
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. Excess
capacitance produces peaking in the amplifier’s fre-
quency response. To decrease stray capacitance, min-
imize trace lengths by placing external components as
close to the instrumentation amplifier as possible. For
best performance, bypass each power supply to
ground with a separate 0.1F capacitor.
Microphone Amplifier
The MAX4462’s bipolar output, along with its excellent
common-mode rejection ratio, makes it suitable for pre-
cision microphone amplifier applications. Figure 7 illus-
trates one such circuit. In this case, the electret
microphone is resistively biased to the supply voltage
through a 2.2k
pullup resistor. The MAX4462 directly
senses the output voltage at its noninverting input, and
indirectly senses the microphone’s ground through an
AC-coupling capacitor. This technique provides excel-
lent rejection of common-mode noise picked up by the
microphone lead wires. Furthermore, ground noise from
distantly located microphones is reduced.
The single-ended output of the MAX4462 is converted to
differential through a single op amp, the MAX4335. The
op amp forces the midpoint between OUT+ and OUT- to
be equal to the reference voltage. The configuration
does not change the MAX4662T’s fixed gain of 10.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4462HEUT | 制造商:Maxim Integrated Products 功能描述:SOT23 3V/5V SINGLE-SUPPLY RAIL-T - Rail/Tube |
| MAX4462HEUT+T | 功能描述:仪表放大器 3V/5V Single-Supply Rail-Rail 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 |
| MAX4462HEUT-T | 功能描述:仪表放大器 3V/5V Single-Supply Rail-Rail 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 |
| MAX4462TESA | 功能描述:仪表放大器 3V/5V Single-Supply Rail-Rail 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 |
| MAX4462TESA-T | 功能描述:仪表放大器 3V/5V Single-Supply Rail-Rail 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 |
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