The EL5106 and EL5306 are fixed gain amplifiers with a bandwidth of 350MHz. This makes these amplifiers ideal for today's high-speed video and monitor applications. They have internal gain setting resistors and can be configured for gain of +1, -1 or +2. With a supply current of only 1.5mA, these amplifiers are capable of operating from a single supply voltage of 5V to 12V and are also ideal for handheld, portable or battery powered devices. The EL5106 and EL5306 also feature an enable and disable function that reduces the supply current to 25µA per amplifier. Allowing the CE pin to float or applying a low logic level will enable the amplifier. The EL5106 is available in 6 Ld SOT-23 and industry standard 8 Ld SOIC packages, and the EL5306 is available in 16 Ld SOIC and 16 Ld QSOP packages. The full operating temperature range is the -40°C to +85°C industrial temperature range.

Product Description

The EL5106 and EL5306 are fixed gain amplifiers with 350MHz wide -3dB bandwidth and low supply current of 1.5mA. They operate from a single 5V to 12V, and they can also swing to within 1.2V of either supply at the output. The combination of these high bandwidth and low power makes the EL5106 and EL5306 ideal for many low power/high bandwidth applications such as portable, handheld or battery powered devices. For different bandwidth and higher gain, consider the EL5191 with 1GHz of 9mA supply current or the EL5162

300MHz frequency at 4mA supply current. Versions include single, dual and triple amplifier packages in 5 Ld SOT-23, 16 Ld QSOP, 8 Ld SOIC or 16 Ld SOIC overview.

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Power Bypass and Printed Circuit Board Layout

As with any high frequency device, a good circuit board layout for printed circuits is essential for achieving optimum performance with a low impedance ground plane structure. Surface mount components are recommended, but if components are used for lead components, the lead length should be as short as possible. The supply pins must be well bypassed to reduce the risk of oscillation. A 4.7µF combination tantalum capacitor was placed in parallel with a 0.01µF capacitor on each supply pin and showed good results.

Disable/Power Down

The EL5106 and EL5306 amplifiers can be disabled by placing their outputs in a high impedance state. When disabled, the amplifier supply current drops to <25µA. EL5106 When the CE pin is pulled up, the EL5306 is disabled to within 1V of the positive supply. Likewise, the amplifier is also

Do this by leaving the CE pin floating or pulling at least 3V below the positive supply. For ±5V supplies, this means that the amplifier will be enabled when CE is 2V or less, and disabled when CE is above 4V. Although the logic levels are not standard TTL, this logic voltage selection allows the EL5106 to enable the EL5306 for single-supply applications with CE grounded even at 5V. The CE pin can drive the CMOS output from it.

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Gain setting

The EL5106 and EL5306 have built-in feedback and gain resistors. The internal feedback resistors are the same value; therefore, the amplifier can be configured for gains +1, -1 and +2 without any external resistors. Figure 1 shows the amplifier configured with a gain of +2. The yield error is ±2% maximum. Figure 2 shows the gain amplifier-1 configuration. For a gain of +1, IN+ and IN- should be connected together, the configuration shown in Figure 3 avoids the effect of any parasitic capacitance on the IN- pin. Since the internal feedback and gain resistors vary with temperature and process, external resistors should not be used to adjust gain settings.

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