Features

600MHz-3DB bandwidth

6MA power current (each amplifier)

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

Quickly enable/disable

Provide 16 ld qsop packaging

) And Double (EL5292)

Provide high -speed, 1GHz products (EL5191)

provide low power, 4MA, 300MHz products (EL5193, EL5293 and EL5393) [ 123]

Provide lead -free plus annealing (compliance with ROHS standard)

Video amplifier

cable drive

RGB amplifier

Test equipment

instrument

current voltage converter [ 123]

Explanation

Triple 600MHz current feedback amplifier

EL5392A

is a triple current feedback amplifier with a very high bandwidth 600MHz. This makes this amplifier an ideal choice for today's high -speed video and monitor applications.

Since the power supply current of each amplifier is only 6 mAh, and the voltage of a single power supply from 5 to 10 volts, EL5392A is also an ideal choice for handheld, portable or battery power supply equipment. EL5392A also has the function of opening and disable, which can reduce the power supply current of each amplifier to 100 μA. Allowing CE pin floating or application of low -logic levels will enable the amplifier.

For the vital application of circuit board space, EL5392A is provided in 16 LD QSOP packaging, and industry standards 16 LD SO (0.150 ). EL5392A from -40 ° C to+85 ° C industrial temperature Work within the scope.

Order information

Note: Intersil lead -free refreshing product uses a special lead -free material group; 100%matte tin -panel terminal decoration, which meets the ROHS standard, is compatible with SNPB and lead -free welding operations. The MSL classification of leadersit -free products is classified as lead -free peak back welding temperature, which meets or exceeds IPC/JEDEC J ST.D-020's lead-free requirements.

Typical performance curve

]

Application information

Product description

is an current feedback computing amplifier in EL5392A, which provides a width-3DB bandwidth 600MHz And a low -power current 6mAh each amplifier. The working voltage range of EL5392A is from a single 5 volt to 10 volts, and they can also swing to the output of any power supply within 1 volt. Due to its current feedback topology, the EL5392A did not have a wide range of normal gain band -width 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 EL5392A an ideal choice for many low power/high bandwidth applications, such as portable, handheld, or battery power supply equipment.

For different bandwidth requirements, you can consider using 1GHz EL5191 under 9MA power current, or 4MA power current EL5193 with 300MHz. The version includes a single, double and Sananpei packaging, with 5 LD SOT-23, 16 LD QSOP and 8 LD or 16 LD SOIC (0.150 ).

circuit board layout

and any any of The same high -frequency device, good printing circuit board layout is a necessary condition for achieving the best performance. Low impedance ground floor construction is essential. It is recommended to use surface installation components, but if you use lead components, the lead length of the lead should be as much as possible as possible as possible as possible. Short. The power pipe foot must be bypassed to reduce the risk of oscillation. When the 4.7 μF 钽 capacitor and 0.01 μF capacitor are placed on each power supply foot, the combination effect is good.

In order to get good goodness The communication performance, the parasitic capacitor should be kept at the minimum, especially at the inverter input terminal. (See the capacitor of the reverse input part) even if the ground layer structure is used Any amplifier capacitor at the node is minimized. Carbon or metal membrane resistors are acceptable. Due to the additional series inductance, the metal membrane resistor is slightly smaller. SOIC (0.150 ) package. The socket increases parasitic inductance and capacitance, which will lead to additional peak and overwhelming.

Disable/power off

EL5392A amplifier can be disabled and put it out of high impedance. When disabled, the amplifier power supply is reduced to lt; 450μA. When its CE pin was pulled to the positive power supply 1V, EL5392A was disabled. Similarly, the amplifier is passedFloating or pulling its CE pin to at least 3V below the positive power supply. For ± 5V power, this means that when the CE is 2V or below, the EL5392A amplifier will be enabled. When the CE is higher than 4V, the amplifier will be disabled. Although the logic level is not a standard TTL, the choice of this logical voltage allows the EL5392A by enabling the CE ground ground, even in the 5V single power supply application. 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 extreme frequencies (increasing the possibility of oscillation).

EL5392A is optimized with 375 feedback resistor. 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

The design and specified gain of EL5392A is+2, and the RF is about 375 . The value of the feedback resistance provides a -3DB bandwidth of 300MHz at the peak of AV 2 and 2DB. At AV -2, the radio frequency of 375 the peak bandwidth and 1DB of 275MHz can be provided. Because EL5392A 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 EL5392A is a current feedback amplifier, its gain bandwidth product is not a constant for different closed loop gains. This feature allows EL5392A 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 375 and still maintains stability. As a result of the increase in closed -loop gain, it will only lead to bandwidth. Lost slightly.

Power supply voltage range and single power operation

EL5392A design is designed to work at a power supply voltage greater than 5V and less than 10V. In fact, this means that EL5392A will work on the dual power supply from ± 2.5V to ± 5V. For single power supply, EL5392A will be from 5V to 10VWork between.

As the power supply voltage continues to decrease, it is necessary to provide the input and output voltage range that closer to the power supply voltage as close as possible. The input range of EL5392A can be extended to 2V of any power supply. For example, on the ± 5V power supply, the input range of EL5392A is ± 3V. The output range of EL5392A is also quite large, which can be extended to the 1V range of the power rail. On the ± 5V power supply, the output can be swinging between -4V and+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 entire 6MA power supply of each EL5392A amplifier. Special circuits are added to EL5392A to reduce changes in the output of output impedance with current output. This causes the DG and DP specifications to be 0.015%and 0.04 °, and the gain is 2 driver of 150

When the gain is +1, the video performance is also measured at 500Ω load. Under these conditions, the DG and DP specifications of EL5392A are 0.03%and 0.05 °, respectively.

Output driving capacity

Although the power current of EL5392A is 6 mAh, it can provide at least ± 95 mAh output current. EL5392A 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 -end terminal of the back terminal will separate EL5392A 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.

Flowing

EL5392A does not have an 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 equipment lossBad.

Power loss

Due to the high output driving capacity of EL5392A, under certain very high load current conditions, the absolute maximum temperature of more than 125 ° C may exceed 125 ° C.Generally speaking, when the RL is less than about 25 calculating the highest knot temperature is very important (TJMAX) to determine whether it is necessary to modify the power voltage, load conditions or packaging type of EL5392A to keep it in safe operationarea.These parameters are calculated as follows:

Among them:

tmax the highest ambient temperature

θja thermal resistance of packaging

] n Number of amplifiers in the package

PDMAX Maximum power consumption of each amplifier in the package

The PDMAX of each amplifier can be calculated as follows:

[
[

[123] Among them: vs power supply voltage ISMAX maximum power supply current 1A voutmax maximum output voltage (required) RL Load resistance