参数资料
| 型号： | MAX4238ASA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC AMP LOW-NOISE 8-SOIC |
| 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： | 通用 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.35 V/µs |
| 增益带宽积： | 1MHz |
| 电流 - 输入偏压： | 1pA |
| 电压 - 输入偏移： | 0.1µV |
| 电流 - 电源： | 600µA |
| 电流 - 输出 / 通道： | 40mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
Detailed Description
The MAX4238/MAX4239 are high-precision amplifiers
that have less than 2.5V of input-referred offset and
low 1/f noise. These characteristics are achieved
through a patented autozeroing technique that samples
and cancels the input offset and noise of the amplifier.
The pseudorandom clock frequency varies from 10kHz
to 15kHz, reducing intermodulation distortion present in
chopper-stabilized amplifiers.
Offset Error Sources
To achieve very low offset, several sources of error
common to autozero-type amplifiers need to be consid-
ered. The first contributor is the settling of the sampling
capacitor. This type of error is independent of input-
source impedance, or the size of the external gain-set-
ting resistors. Maxim uses a patented design technique
to avoid large changes in the voltage on the sampling
capacitor to reduce settling time errors.
The second error contributor, which is present in both
autozero and chopper-type amplifiers, is the charge
injection from the switches. The charge injection
appears as current spikes at the input, and combined
with the impedance seen at the amplifier’s input, con-
tributes to input offset voltage. Minimize this
feedthrough by reducing the size of the gain-setting
resistors and the input-source impedance. A capacitor
in parallel with the feedback resistor reduces the
amount of clock feedthrough to the output by limiting
the closed-loop bandwidth of the device.
The design of the MAX4238/MAX4239 minimizes the
effects of settling and charge injection to allow specifi-
cation of an input offset voltage of 0.1V (typ) and less
than 2.5V over temperature (-40°C to +85°C).
1/f Noise
1/f noise, inherent in all semiconductor devices, is
inversely proportional to frequency. 1/f noise increases
3dB/octave and dominates amplifier noise at lower fre-
quencies. This noise appears as a constantly changing
voltage in series with any signal being measured. The
MAX4238/MAX4239 treat 1/f noise as a slow varying
offset error, inherently canceling the 1/f noise.
Typical Operating Characteristics (continued)
(VCC = 5V, VCM = 0V, RL = 10kΩ connected to VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.)
MAX4238/MAX4239
Ultra-Low Offset/Drift, Low-Noise,
Precision SOT23 Amplifiers
7
Maxim Integrated
SHUTDOWN WAVEFORM
MAX4238/39 toc20
RL = 10k
Ω
CL = 100pF
10
μs/div
OUT
2V/div
1V/div
SHDN
EMIRR vs. FREQUENCY
MAX4238/39
toc21
FREQUENCY (MHz)
EMIRR
(dB)
1000
100
40
20
60
80
100
120
140
0
10
VCC = 5V, RFIN = 16dBm
DC TO 10Hz NOISE
MAX4238/39 toc19
VCC = 2.5V
VEE = -2.5V
1s/div
OUT
2
μV/div
PIN
TDFN
SOT23
SO
NAME
FUNCTION
1
6
OUT
Amplifier Output
2
4
GND
Ground
3
IN+
Noninverting Input
4
2
IN-
Inverting Input
5
1
SHDN
Shutdown Input. Active-low
shutdown, connect to VCC
for normal operation.
6
7
VCC
Positive Power Supply
—
5, 8
N.C.
No Connection. Not
internally connected.
—
EP
Exposed Pad (TDFN only).
Connect EP to GND.
Pin Description
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4238ATT+ | 制造商:Maxim Integrated Products 功能描述:OP AMP SGL GP R-R O/P 5.5V 6TDFN EP - Rail/Tube |
| MAX4238ATT+T | 功能描述:精密放大器 Low Offset/Drift Precision RoHS:否 制造商:Maxim Integrated 每芯片的通道数量: 输入补偿电压:0.25 mV at +/- 5 V 输入电压范围（最大值）: 安装风格: 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX4238AUT | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4238AUT#G16 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4238AUT#TG16 | 功能描述:精密放大器 Low Offset/Drift Precision RoHS:否 制造商:Maxim Integrated 每芯片的通道数量: 输入补偿电压:0.25 mV at +/- 5 V 输入电压范围（最大值）: 安装风格: 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
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