Electronic Components Datasheet Search |
|
EL2445CN Datasheet(PDF) 10 Page - Intersil Corporation |
|
EL2445CN Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 12 page 10 function contribute to even higher closed loop bandwidths. For example, the EL2245 and EL2445 have a -3dB bandwidth of 100MHz at a gain of +2, dropping to 20MHz at a gain of +5. It is important to note that the EL2245 and EL2445 have been designed so that this “extra” bandwidth in low-gain applications does not come at the expense of stability. As seen in the typical performance curves, the EL2245 and EL2445 in a gain of +2 only exhibit 1.0dB of peaking with a 1k Ω load. Video Performance An industry-standard method of measuring the video distortion of components such as the EL2245/ EL2445 is to measure the amount of differential gain (dG) and differential phase (dP) that they introduce. To make these measurements, a 0.286VPP (40 IRE) signal is applied to the device with 0V DC offset (0 IRE) at either 3.58MHz for NTSC or 4.43MHz for PAL. A second measurement is then made at 0.714V DC offset (100 IRE). Differential gain is a measure of the change in amplitude of the sine wave, and is measured in percent. Differential phase is a measure of the change in phase, and is measured in degrees. For signal transmission and distribution, a back-terminated cable (75 Ω in series at the drive end, and 75Ω to ground at the receiving end) is preferred since the impedance match at both ends will absorb any reflections. However, when double termination is used, the received signal is halved; therefore a gain of 2 configuration is typically used to compensate for the attenuation. The EL2245 and EL2445 have been designed as an economical solution for applications requiring low video distortion. They have been thoroughly characterized for video performance in the topology described above, and the results have been included as typical dG and dP specifications and as typical performance curves. In a gain of +2, driving 150 Ω, with standard video test levels at the input, the EL2245 and EL2445 exhibit dG and dP of only 0.02% and 0.07° at NTSC and PAL. Because dG and dP can vary with different DC offsets, the video performance of the EL2245 and EL2445 has been characterized over the entire DC offset range from -0.714V to +0.714V. For more information, refer to the curves of dG and dP vs DC Input Offset. Output Drive Capability The EL2245 and EL2445 have been designed to drive low impedance loads. They can easily drive 6VPP into a 150Ω load. This high output drive capability makes the EL2245 and EL2445 an ideal choice for RF, IF and video applications. Furthermore, the current drive of the EL2245 and EL2445 remains a minimum of 35mA at low temperatures. Printed-Circuit Layout The EL2245 and EL2445 are well behaved, and easy to apply in most applications. However, a few simple techniques will help assure rapid, high quality results. As with any high-frequency device, good PCB layout is necessary for optimum performance. Ground-plane construction is highly recommended, as is good power supply bypassing. A 0.1µF ceramic capacitor is recommended for bypassing both supplies. Lead lengths should be as short as possible, and bypass capacitors should be as close to the device pins as possible. For good AC performance, parasitic capacitances should be kept to a minimum at both inputs and at the output. Resistor values should be kept under 5k Ω because of the RC time constants associated with the parasitic capacitance. Metal-film and carbon resistors are both acceptable, use of wire-wound resistors is not recommended because of their parasitic inductance. Similarly, capacitors should be low-inductance for best performance. The EL2245 and EL2445 Macromodel This macromodel has been developed to assist the user in simulating the EL2245 and EL2445 with surrounding circuitry. It has been developed for the PSPICE simulator (copywritten by the Microsim Corporation), and may need to be rearranged for other simulators. It approximates DC, AC, and transient response for resistive loads, but does not accurately model capacitive loading. This model is slightly more complicated than the models used for low-frequency op-amps, but it is much more accurate for AC analysis. The model does not simulate these characteristics accurately: •Noise •Settling time • Non-linearities • Temperature effects • Manufacturing variations •CMRR • PSRR EL2245, EL2445 |
Similar Part No. - EL2445CN |
|
Similar Description - EL2445CN |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |