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| 型號： | LM7131ACMX |
| 廠商： | National Semiconductor |
| 文件頁數(shù)： | 14/28頁 |
| 文件大小： | 0K |
| 描述： | IC OP AMP TINY HS SNG SUPP 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 電壓反饋 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 150 V/µs |
| 增益帶寬積： | 70MHz |
| -3db帶寬： | 90MHz |
| 電流 - 輸入偏壓： | 20µA |
| 電壓 - 輸入偏移： | 20µV |
| 電流 - 電源： | 7.5mA |
| 電流 - 輸出 / 通道： | 65mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 12 V，± 2.5 V ~ 6 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | *LM7131ACMX |
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OBSOLETE
SNOS737C – SEPTEMBER 1999 – REVISED APRIL 2013
Temperature Rise = 0.085 W x 325°/W = 27.625 degrees
Junction temperature at 40° ambient = 40 + 27.625 =
67.6225°.
This device is within the 0° to 70° specification limits.
The 325°/W value is based on still air and the pc board land pattern shown in this datasheet. Actual power
dissipation is sensitive to PC board connections and airflow.
SOT23-5 power dissipation may be increased by airflow or by increasing the metal connected to the pads,
especially the center pin (pin number 2, V
) on the left side of the SOT23-5. This pin forms the mounting paddle
for the die inside the SOT23-5, and can be used to conduct heat away from the die. The land pad for pin 2 can
be made larger and/or connected to power planes in a multilayer board.
Additionally, it should be noted that difficulty in meeting performance specifications for the LM7131 is most
common at cold temperatures. While excessively high junction temperatures will degrade LM7131 performance,
testing has confirmed that most specifications are met at a junction temperature of 85°C.
See “Understanding Integrated Circuit Package Power Capabilities”, Application Note AN-336, which may be
found in the appendix of the Operational Amplifier Databook.
Layout and Power Supply Bypassing
Since the LM7131 is a high speed (over 50 MHz) device, good high speed circuit layout practices should be
followed. This should include the use of ground planes, adequate power supply bypassing, removing metal from
around the input pins to reduce capacitance, and careful routing of the output signal lines to keep them away
from the input pins.
The power supply pins should be bypassed on both the negative and positive supply inputs with capacitors
placed close to the pins. Surface mount capacitors should be used for best performance, and should be placed
as close to the pins as possible. It is generally advisable to use two capacitors at each supply voltage pin. A
small surface mount capacitor with a value of around 0.01 microfarad (10 nF), usually a ceramic type with good
RF performance, should be placed closest to the pin. A larger capacitor, in usually in the range of 1.0
μF to 4.7
μF, should also be placed near the pin. The larger capacitor should be a device with good RF characteristics and
low ESR (equivalent series resistance) for best results. Ceramic and tantalum capacitors generally work well as
the larger capacitor.
For single supply operation, if continuous low impedance ground planes are available, it may be possible to use
bypass capacitors between the +5V supply and ground only, and reduce or eliminate the bypass capacitors on
the V
pin.
Capacitive Load Driving
The phase margin of the LM7131 is reduced by driving large capacitive loads. This can result in ringing and
slower settling of pulse signals. This ringing can be reduced by placing a small value resistor (typically in the
range of 22
Ω–100Ω) between the LM7131 output and the load. This resistor should be placed as close as
practical to the LM7131 output. When driving cables, a resistor with the same value as the characteristic
impedance of the cable may be used to isolate the cable capacitance from the output. This resistor will reduce
reflections on the cable.
Input Current
The LM7131 has typical input bias currents in the 15
μA to 25 μA range. This will not present a problem with the
low input impedances frequently used in high frequency and video circuits. For a typical 75
Ω input termination,
20
μA of input current will produce a voltage across the termination resistor of only 1.5 mV. An input impedance
of 10 k
Ω, however, would produce a voltage of 200 mV, which may be large compared to the signal of interest.
Using lower input impedances is recommended to reduce this error source.
Feedback Resistor Values and Feedback Compensation
Using large values of feedback resistances (roughly 2k) with low gains (such gains of 2) will result in degraded
pulse response and ringing. The large resistance will form a pole with the input capacitance of the inverting input,
delaying feedback to the amplifier. This will produce overshoot and ringing. To avoid this, the gain setting
resistors should be scaled to lower values (below 1k) At higher gains (> 5) larger values of feedback resistors
can be used.
Copyright 1999–2013, Texas Instruments Incorporated
21
Product Folder Links: LM7131
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相關(guān)代理商/技術(shù)參數(shù) |
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| LM7131ACN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:IC-HIGH SPEED OP AMP |
| LM7131BCM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM7131BCM5 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Tiny High Speed Single Supply Operational Amplifier |
| LM7131BCM5X | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM7131BCMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Tiny High Speed Single Supply Operational Amplifier |
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