The EL5210 and EL5410 are low power, high voltage rail-to-rail input-output amplifiers. The EL5210 contains two amplifiers in one package and the EL5410 contains four amplifiers. Operating over a voltage range of 5V to 15V , while consuming only 2.5mA per amplifier, the EL5410 and EL5210 have a bandwidth of 30MHz (-3dB). They also offer common-mode input capability beyond the power rails, as well as rail-to-rail output capability. This allows these amplifiers to provide maximum dynamic range at any supply voltage. The EL5410 and EL5210 also feature fast transition and settling times, as well as high output drive capability of 30mA (drain and source). These features make these amplifiers ideal for high-speed filtering and signal conditioning applications. Other applications include battery power, portable devices, and where low power consumption is important. The EL5410 is available in a space saving 14 Ld TSSOP package, as well as an industry standard 14 Ld SOIC package. The EL5210 is available in both 8-pin MSOP and 8 Ld SOIC packages. Both come with standard op amp pins out. These amplifiers operate over a temperature range of -40°C to +85°C.

Product Description

The EL5210 and EL5410 voltage feedback amplifiers are manufactured using a high voltage CMOS process. They exhibit rail-to-rail input and output capability, are unity-gain stable and have low power consumption (2.5 mA per amplifier). These features make the EL5210 and EL5410 ideal for a wide range of general-purpose applications. Connected to voltage follower mode and driven into 1kΩ and into a 12pF load, the EL5210 and EL5410 have a -3dB bandwidth of 30MHz while maintaining a slew rate of 33V/µs. The EL5210 is a dual amplifier and the EL5410 is a quad amplifier.

Operating Voltage

Inputs and outputs of the EL5210 and EL5410 are specified with a single nominal supply voltage from 5V to 15V or a split supply with a total range of 5V to 15V. Proper operation is guaranteed with a supply voltage range of 4.5V to 16.5V. Most EL5210 and EL5410 specifications have stability over both full voltage ranges and an operating temperature of -40°C to +85°C. Parameter variation versus operating voltage and/or temperature is shown in the typical performance curves. The input common-mode voltage range of the EL5210 and the EL5410 extend beyond 500mV of the power rails. The output fluctuations of the EL5210 and EL5410 typically extend to 5mA within 100mV of the positive and negative supply rails with the load. Reducing the load current will extend the output voltage range closer to the supply rails. Figure 1 shows the setup for the input and output waveforms, configured in unity gain. Operates from ±5V supplies with a 1kΩ load connected to GND. The input is a 10VP-P sinusoid. The output voltage is about 9.8V PP.

Figure 1. Has Rail-to-Rail Input and Operational Output

Short circuit current limit

The EL5210 and EL5410 will limit short-circuit current to the negative supply if the output is shorted directly to positive or ±120mA. If an output is shorted indefinitely, power dissipation can easily increase so that the device can be damaged. Maximum reliability is maintained if the continuous current at the output does not exceed ±30mA. This limitation is provided by the design of the internal metal interconnects.

output phase reversal

The EL5210 and EL5410 are immune to inversion as long as the input voltage is not limited from V S--0.5V to VS++0.5V. Figure 2 shows a photograph of the output of the device as the input voltage is driven beyond the power rails. Although the output of the device will not change phase, the overvoltage of the input should be avoided. If the input voltage exceeds the supply voltage by more than 0.6V, electrostatic protection diodes placed on the input stage of the device begin to conduct and overvoltage damage may occur.

Figure 2. BEYOND Swing Input Operation

Power consumption

The high output drive capability of the EL5210 and the EL5410 amplifier are so capable of exceeding the current "absolute maximum junction temperature" of 125°C under a certain load. Therefore, it is very important to calculate the maximum junction temperature for the application to determine the load conditions that need to be modified for the amplifier to remain within the safe operating area. The maximum power consumption allowed in a package is determined according to the following formula:

Driving capacitive loads

The EL5210 and EL5410 can drive a variety of capacitive loads. As the load capacitance increases, however, the -3dB bandwidth of the device will decrease, and the peak value will increase. The amplifier drives a 10pF load in parallel with 1kΩ with only 1.2dB peak, and a 100pF capacitor with 6.5dB peak shaving. If less peaking is required in these applications, a small series resistor (usually 5Ω and 50Ω) can be placed on the series output. However, this obviously reduces the gain slightly. Another way to restore peaking is to add a "snubber" circuit on the output. A snubber is a shunt load consisting of a resistor in series with a capacitor. Values of 150Ω and 10nF are typical. The advantage of buffering is that it does not draw any DC load current or reduce gain.

Power Bypass and Printed Circuit Board Layout

The EL5210 and EL5410 provide high frequencies for gain. As with any high frequency device, good printed circuit board layout is necessary for optimum performance. Ground plane construction is strongly recommended, lead lengths should be kept as short as possible and power pins must be well bypassed to reduce the risk of oscillation. For normal single-supply operation, where the VS- pin is connected to ground, a 0.1µF ceramic capacitor should be placed from the VS+ pin to the VS- pin. A 4.7µF tantalum capacitor should then be connected in parallel and placed in the area of the amplifier. A 4.7µF capacitor can be used for multiple devices. The same combination of capacitors should be placed on each power pin to ground if split consumables are used.