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LM7121IM5X 数据表(PDF) 14 Page - National Semiconductor (TI) |
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LM7121IM5X 数据表(HTML) 14 Page - National Semiconductor (TI) |
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14 / 19 page ![]() Typical Performance Characteristics T A= 25˚C, RL = 1MΩ. unless otherwise specified (Continued) Application Information The table below, depicts the maximum operating supply volt- age for each package type: TABLE 1. Maximum Supply Voltage Values SOT23-5 SO-8 Single Supply 10V 30V Dual Supplies ±5V ±15V Stable unity gain operation is possible with supply voltage of 5V for all capacitive loads. This allows the possibility of using the device in portable applications with low supply voltages with minimum components around it. Above a supply voltage of 6V (±3V Dual supplies), an addi- tional resistor and capacitor (shown below) should be placed in the feedback path to achieve stability at unity gain over the full temperature range. The package power dissipation should be taken into account when operating at high ambient temperatures and/or high power dissipative conditions. Refer to the power derating curves in the data sheet for each type of package. In determining maximum operable temperature of the de- vice, make sure the total power dissipation of the device is considered; this includes the power dissipated in the device with a load connected to the output as well as the nominal dissipation of the op amp. The device is capable of tolerating momentary short circits from its output to ground but prolonged operation in this mode will damage the device, if the maximum allowed junc- tion temperation is exceeded. APPLICATION CIRCUITS Current Boost Circuit The circuit in Figure 2 can be used to achieve good linearity along with high output current capability. By proper choice of R 3, the LM7121 output can be set to supply a minimal amount of current, thereby improving its output linearity. R 3 can be adjusted to allow for different loads: R 3 = 0.1 RL The circuit above has been set for a load of 100 Ω. Reasonable speeds (<30 ns rise and fall times) can be ex- pected up to 120 mA PP of load current (see Figure 3 for step response across the load). Undistorted Output Swing vs Frequency DS012348-86 Total Power Dissipation vs Ambient Temperature DS012348-65 DS012348-87 FIGURE 1. Typical Circuit for A V = +1 Operation (V S ≥ 6V) DS012348-92 FIGURE 2. Simple Circuit to Improve Linearity and Output Drive Current www.national.com 14 |
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