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AMC2344 Fiches technique(PDF) 7 Page - ADDtek Corp |
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AMC2344 Fiches technique(HTML) 7 Page - ADDtek Corp |
7 / 11 page AMC2244/AMC2344/AMC2444 Copyright © 2006 2006 ADDtek Corp. 7 DD006_E -- JUNE 2006 APPLICATION INFORMATION Product Description The AMC2244/AMC2344/AMC2444 are low-power wideband monolithic operational amplifiers implemented with a classical voltage-feedback topology. This allows them to be used in a variety of applications where current-feedback amplifiers are not appropriate. For example, a capacitor to be placed in the feedback path, making it an excellent choice for applications such as active filters, sample-and-holds, or integrators. Similarly, because of the ability to use diodes in the feedback network, the AMC2244/AMC2344/AMC2444 are an excellent choice for applications such as fast log amplifiers. Power Dissipation In order to prevent the junction temperature to exceed 150 °C , it is important to calculate the maximum junction temperature (TJmax) for all applications to determine if power-supply voltages, load conditions, or package type need to be modified such that the AMC2244/AMC2344/AMC2444 remain in the safe operating area. These parameters are related as follows: TJmax = Tmax + (θJA× PDmaxtotal) Where PDmaxtotal is the sum of the maximum power dissipation of each amplifier in the package (PDmax). PDmax for each amplifier can be calculated as follows : PDmax= ( 2 × VS × ISmax + (VS - Voutmax) × ( Voutmax /RL)) where: Tmax =Maximum Ambient Temperature θJA = Thermal Resistance of the Package PDmax = Maximum Power Dissipation of 1 Amplifier VS = Supply Voltage ISmax = Maximum Supply Current of 1 Amplifier Voutmax = Maximum Output Voltage Swing of the Application RL = Load Resistance To serve as a guide for the user, we can calculate maximum allowable supply voltages for the example of the video cable-driver below since we know that TJmax = 150°C, Tmax = 75°C, ISmax = 8.2 mA, and the package θJAs are shown in Table 1. If we assume (for this example ) that we are driving a back-terminated video cable, then the maximum average value (over duty-cycle) of Voutmax is 1.4V, and RL = 150Ω, giving the results seen in Table 1. Table 1 Device Package θJA PDmax @ Tmax Max VS AMC2244M 8P DIP 95°C /W 0.789W @ 75°C ±16.6V AMC2244DM 8P SOIC 125°C /W 0.600W @ 75°C ±12.1V AMC2344N/AMC2444N 14P DIP 70°C /W 1.071W @ 75°C ±11.5V AMC2344D/AMC2444D 14P SOIC 110°C /W 0.682W @ 75°C ±7.5V |
Numéro de pièce similaire - AMC2344 |
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Description similaire - AMC2344 |
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