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| 型号： | MAX412BESA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP LN LV PREC 28MHZ 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 转换速率： | 4.5 V/µs |
| 增益带宽积： | 28MHz |
| 电流 - 输入偏压： | 80nA |
| 电压 - 输入偏移： | 120µV |
| 电流 - 电源： | 2.5mA |
| 电流 - 输出 / 通道： | 35mA |
| 电压 - 电源，单路/双路(±)： | 4.8 V ~ 10.5 V，±2.4 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°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： | 管件 |
MAX410/MAX412/MAX414
Single/Dual/Quad, 28MHz, Low-Noise,
Low-Voltage, Precision Op Amps
8
_______________________________________________________________________________________
Applications Information
The MAX410/MAX412/MAX414 provide low voltage-
noise performance. Obtaining low voltage noise from a
bipolar op amp requires high collector currents in the
input stage, since voltage noise is inversely proportion-
al to the square root of the input stage collector current.
However, op amp current noise is proportional to the
square root of the input stage collector current, and the
input bias current is proportional to the input stage col-
lector current. Therefore, to obtain optimum low-noise
performance, DC accuracy, and AC stability, minimize
the value of the feedback and source resistance.
Total Noise Density vs. Source Resistance
The standard expression for the total input-referred
noise of an op amp at a given frequency is:
where:
Rn = Inverting input effective series resistance
Rp = Noninverting input effective series resistance
en = Input voltage-noise density at the frequency of
interest
in = Input current-noise density at the frequency of
interest
T = Ambient temperature in Kelvin (K)
k = 1.28 x 10-23 J/K (Boltzman’s constant)
In Figure 1, Rp = R3 and Rn = R1 || R2. In a real appli-
cation, the output resistance of the source driving the
input must be included with Rp and Rn. The following
example demonstrates how to calculate the total out-
put-noise density at a frequency of 1kHz for the
MAX412 circuit in Figure 1.
Gain = 1000
4kT at +25°C = 1.64 x 10-20
Rp = 100
Rn = 100 || 100k = 99.9 W
en = 1.5nV/√Hz at 1kHz
in = 1.2pA/√Hz at 1kHz
et = [(1.5 x 10-9)2 + (100 + 99.9)2 (1.2 x 10-12)2 + (1.64
x 10-20) (100 + 99.9)]1/2 = 2.36nV/
√Hz at 1kHz
Output noise density = (100)et = 2.36V/√Hz at 1kHz.
In general, the amplifier’s voltage noise dominates with
equivalent source resistances less than 200
. As the
equivalent source resistance increases, resistor noise
becomes the dominant term, eventually making the
voltage noise contribution from the MAX410/MAX412/
MAX414 negligible. As the source resistance is further
increased, current noise becomes dominant. For exam-
ple, when the equivalent source resistance is greater
than 3k
at 1kHz, the current noise component is larg-
er than the resistor noise. The graph of Total Noise
Density vs. Matched Source Resistance in the
Typical
Operating Characteristics shows this phenomenon.
Optimal MAX410/MAX412/MAX414 noise performance
and minimal total noise achieved with an equivalent
source resistance of less than 10k
.
Voltage Noise Testing
RMS voltage-noise density is measured with the circuit
shown in Figure 2, using the Quan Tech model 5173
noise analyzer, or equivalent. The voltage-noise density
at 1kHz is sample tested on production units. When
measuring op-amp voltage noise, only low-value, metal
film resistors are used in the test fixture.
The 0.1Hz to 10Hz peak-to-peak noise of the
MAX410/MAX412/MAX414 is measured using the test
ee
i
tn
p
n
p
n
2
+(R +R )
+ 4kT (R +R )
=
Figure 1. Total Noise vs. Source Resistance Example
R1
100
R2
100k
+5V
0.1
F
R3
100
D.U.T
0.1
F
-5V
et
MAX410
MAX412
MAX414
Figure 2. Voltage-Noise Density Test Circuit
D.U.T
en
MAX410
MAX412
MAX414
3
27
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相关代理商/技术参数 |
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| MAX412BESA+ | 功能描述:精密放大器 Dual 28MHz Low-V Low-Noise 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 |
| MAX412BESA+T | 功能描述:精密放大器 Dual 28MHz Low-V Low-Noise 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 |
| MAX412BESA-T | 功能描述:精密放大器 Dual 28MHz Low-V Low-Noise 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 |
| MAX412BMJA | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single/Dual/Quad, 28MHz, Low-Noise, Low-Voltage, Precision Op Amps |
| MAX412C/D | 功能描述:精密放大器 DICE SALES DICE 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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