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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LM359J Fiches technique(PDF) 7 Page - National Semiconductor (TI) |
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LM359J Fiches technique(HTML) 7 Page - National Semiconductor (TI) |
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7 / 24 page  Typical Performance Characteristics (Continued) Application Hints The LM359 consists of two wide bandwidth, decompensated current differencing (Norton) amplifiers. Although similar in operation to the original LM3900, design emphasis for these amplifiers has been placed on obtaining much higher fre- quency performance as illustrated in Figure 1. This significant improvement in frequency response is the result of using a common-emitter/common-base (cascode) gain stage which is typical in many discrete and integrated video and RF circuit designs. Another versatile aspect of these amplifiers is the ability to externally program many in- ternal amplifier parameters to suit the requirements of a wide variety of applications in which this type of amplifier can be used. DC BIASING The LM359 is intended for single supply voltage operation which requires DC biasing of the output. The current mirror circuitry which provides the non-inverting input for the ampli- fier also facilitates DC biasing the output. The basic opera- tion of this current mirror is that the current (both DC and AC) flowing into the non-inverting input will force an equal amount of current to flow into the inverting input . The mirror gain (A I) specification is the measure of how closely these two currents match. For more details see National Applica- tion Note AN-72. DC biasing of the output is accomplished by establishing a reference DC current into the (+) input, I IN(+), and requiring the output to provide the (−) input current. This forces the output DC level to be whatever value necessary (within the output voltage swing of the amplifier) to provide this DC ref- erence current, Figure 2. The DC input voltage at each input is a transistor V BE ( ≅ 0.6 V DC) and must be considered for DC biasing. For most applications, the supply voltage, V +, is suitable and convenient for establishing I IN(+). The inverting input bias current, I b(−), is a direct function of the programmable input stage current (see current programmability section) and to obtain predictable output DC biasing set I IN(+) ≥ 10Ib(−). Amplifier to Amplifier Coupling (Input Referred) DS007788-57 Noise Voltage DS007788-58 Maximum Power Dissipation DS007788-59 Note: Shaded area refers to LM359J/LM359N DS007788-6 FIGURE 1. DS007788-7 FIGURE 2. www.national.com 7 |
Numéro de pièce similaire - LM359J |
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Description similaire - LM359J |
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