Features

300MHz-3DB bandwidth

4MA power current (each amplifier)

single power supply and dual dual-dual Power operation, from 5V to 10V

Quickly enable/disable (only EL5293 a)

one -way (EL5193) and triple -heavy (EL5393)

Provide high -speed, 1GHz products (EL5191)

Provide high -speed, 6MA, 600MHz products (EL5192, EL5292 and EL5392)

] Provide lead -free plus annealing (in line with the ROHS standard)

Application

Video amplifier

cable driver

RGB amplifier

123] Instrument

current voltage converter

Explanation

Double 300MHz current feedback amplifier with envelopes

Note: Intersil lead -free additional fire product uses a special lead -free material group; molded compounds/mold connection materials and 100%matte matte The tinboard terminal decoration meets the ROHS standard and is compatible with SNPB and lead -free welding operations. The MSL of the Intersil lead -free product is classified as a lead -free peak return welding temperature, which meets or superPass the lead requirements of IPC/JEDEC J STD-020.

Pipelined lead

Typical performance curve

] Application information Product description ] EL5293 is a current feedback computing amplifier, which provides a 300MHz width-3DB bandwidth and a low power current of each amplifier 4MA. The working voltage range of EL5293 is from a single 5 volts to 10 volts, and they can also swing to the output voltage of any power supply within 1 volt. Due to its current feedback topology, the EL5293 did not have normal gain bandwidth -wide multiplication related to the voltage feedback computing amplifier. On the contrary, with the increase of closed-loop gain, its -3DB bandwidth remains relatively constant. The combination of high bandwidth and low power consumption, coupled with positive pricing, makes EL5293 an ideal choice for many low power/high bandwidth applications, such as portable, handheld, or battery power supply equipment. For different bandwidth demand, you can consider using 1GHz EL5191 under 9 mAh power current, or 600MHz EL5192 with a 6mA power supply. The versions include single, double and Sananpei packaging, with 5 stitches SOT23, 16 stitches QSOP and 8 -needle or 16 -pin SO outline.

Power bypass and printing circuit board layout

Like any high -frequency device, good printing circuit board layout is a necessary condition for the best performance. The construction of low impedance ground flooring is essential. It is recommended to use the surface installation component, but if a lead -containing component is used, the lead length should be as short as possible. The power pipe foot must be bypassed to reduce the risk of oscillation. When the 4.7μF capacitor and 0.01 μF capacitors are placed on each power, the combination effect is good.

In order to obtain good communication performance, parasitic capacitors should be kept at the minimum value, especially in the inverter input end. (See the capacitance of the reverse input part.) Even if the ground layer structure is used, it should be removed from the nearby area to minimize the any of the strange capacitors at the node. Carbon or metal membrane resistors are acceptable. Due to the additional series inductance, the metal membrane resistor is slightly smaller. If possible, you should avoid using a socket, especially for SO packages. The socket increases parasitic inductance and capacitance, which will lead to additional peak and overwhelming.

Disable/power off

EL5293A amplifier can be disabled and put it out of high impedance. When disabled, the amplifier power supply is reduced to lt; 300μA. When its CE pin is pulled to the positive pole power 1VInside, EL5293A was disabled. Similarly, the amplifier is achieved by floating or pulling its CE pin to at least 3V below the positive power supply. For ± 5V power supply, this means that the EL5293A amplifier is enabled when CE is less than equal to 2V, and it is disabled when CE is higher than 4V. Although the logic level is not a standard TTL, this logical voltage selection allows to enable EL5293A by grounding CE grounded, even in the application of 5V single power supply. The CE tube foot can be driven from the CMOS output.

Input capacitance in the inverter

Any manufacturer's high -speed voltage or current feedback amplifier may be affected by the turbulent capacitor of the inverter input. For inverter gains, this parasitic capacitor has a small impact, because inverter input is a virtual place, but for non -inverter gains, this capacitor (with feedback resistance and gain resistance) forms a polar point on the feedback path of the amplifier. Essence If the frequency is low enough, the zero point of the zero point in the front -to -ring response has the same disability effect. The use of large -value feedback and gain resistance has exacerbated the problem by further reducing the frequency of mixture (the possibility of increasing oscillation), and the feedback resistor is optimized. Because the high bandwidth of these amplifiers is combined with parasitic capacitors, these resistance values may cause stability problems. Therefore, it is not recommended to set ground layers around the reverse input pin of the amplifier.

Feedback resistance value

The design and specified gain of EL5293 is+2, and the RF is about 500 The value of the feedback resistance provides a 200MHz-3DB bandwidth at AV 2, with a peak of 2DB. At the time of AV -2, the radio frequency of about 500 can provide a bandwidth of 175MHz with a peak of 0.2dB. Since EL5293 is a current feedback amplifier, it can also change the radio frequency value to obtain more bandwidth. From the frequency response curve of different RF and RG, it can be seen that by changing the value of the feedback resistor, the bandwidth and peak values can be easily changed.

Because EL5293 is a current feedback amplifier, its gain bandwidth product is not a constant for different closed -loop gains. This function actually allows EL5293 to maintain the same-3DB bandwidth. As the gain increases, the bandwidth has decreased slightly, and the stability increases. Because the stability of the ring circuit is increased with higher closed -loop gain, the RF value can be reduced to the specified 475 and still maintains stability. As a result of the increase in closed -loop gain, it will only cause bandwidth to bandwidth. Lost slightly.

Power supply voltage range and single power operation

EL5293 design is designed to work at a power supply voltage greater than 5V and less than 10V. In fact, this means that EL5293 will work on dual power supply from ± 2.5V to ± 5V. For single power, EL5293 will work between 5V and 10V.

When the power supply voltage continues to decrease

, the input and output voltage range of the power supply voltage must be provided as possible. The input range of EL5293 can be extended to 2V of any power supply. For example, on the+5V power supply, the input range of EL5293 is ± 3V. The output range of EL5293 is also quite large, which can be extended to the 1V range of the power rail. Therefore, on the ± 5V power supply, the output can be swinged from -4V to+4V. Due to the increase in external drop -resistant grounds, the negative swing is increased, so the output range of the single power supply is larger.

Video Performance

In order to obtain good video performance, a amplifier is needed to maintain the same output impedance and the same frequency response, because the DC level is changed at the output end. This is particularly difficult when driving 150 standard video load, because the output current changes with changes in the DC level. In the past, a good differential gain can only be obtained by running a high idling current through the output transistor (to reduce the change in the output impedance). These currents are often comparable to the 4MA power supply current of each EL5293 amplifier. Special circuits are added to EL5293 to reduce changes in the output of output impedance with current output. This makes the DG and DP specifications 0.03%and 0.04 °, while driving 150 at the same time with 2 gains.

When the gain is +1, the video performance is also measured at 500Ω load. Under these conditions, the DG and DP specifications of EL5293 are 0.03%and 0.04 °.

Output driving capacity

Although the power current of EL5293 is very low, it can provide at least ± 95 mAh output current. EL5293 has the smallest ± 95mA output driver, which can drive 50 load to two orbit, making it an excellent choice for the driver isolation transformer in the telecommunications application.

Drive cable and capacitance load

When used as a cable driver, it is recommended to always use double -end connections to achieve non -reflective performance. For these applications, the back terminal of the back terminal will separate EL5293 from the cable, and allows a wide range of capacitor drivers. However, other applications may have a high -capacitance load without the back terminal resistor. In these applications, a small series resistance (usually between 5 and 50 ) can be connected in series with the output to eliminate most peak values. You can then select the gain resistor (RG) to compensate any gain loss caused by the additional resistor at the output end. In many cases, the value of the feedback resistor (RF) can also be simply increased to reduce the peak value.

Flow limit

EL5293 has no internal current limit circuit. If the output is short -circuited, it may exceed the absolute maximum rated value of the output current or power consumption, which may cause device damage.

Power lossConsumption

Due to the high output driving capacity of EL5293, under certain very high load current conditions, it may exceed the absolute maximum temperature of more than 125 ° C.Generally speaking, when the RL drops to about 25 below, it is important to calculate the highest knot temperature (TJMAX) to determine whether the power supply voltage, load conditions, or packaging type is required to keep EL5293 in a safe operation areaEssenceThese parameters are calculated as follows:

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