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AD4311-1 Fiches technique(PDF) 11 Page - Analog Devices |
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AD4311-1 Fiches technique(HTML) 11 Page - Analog Devices |
11 / 16 page ADA4311-1 Rev. 0 | Page 11 of 16 APPLICATION INFORMATION FEEDBACK RESISTOR SELECTION The feedback resistor has a direct impact on the closed-loop bandwidth and stability of the current feedback op amp. Reducing the resistance below the recommended value can make the amplifier response peak and even become unstable. Increasing the size of the feedback resistor beyond the recom- mended value reduces the closed-loop bandwidth. Table 5 provides a convenient reference for quickly determining the feedback and gain resistor values, and the corresponding bandwidth, for common gain configurations. The recommended feedback resistor value for the ADA4311-1 is 499 Ω. Table 5. Recommended Values and Frequency Performance1 Gain RF (Ω) RG (Ω) −3 dB SS BW (MHz) +5 499 124 310 +5 1 k 250 220 +10 499 55.4 175 +20 499 26.1 84 1 Conditions: VS = ±12 V, TA = 25°C, RL = 50 Ω, PD1, PD0 = 0, 0. POWER CONTROL MODES OF OPERATION The ADA4311-1 features four power modes: full power, ¾ power, ½ power, and shutdown. The power modes are controlled by two logic pins, PD0 and PD1. The power-down control pins are compatible with standard 3 V and 5 V CMOS logic. Table 6 shows the various power modes and associated logic states. In the power-down mode, the output of the amplifier goes into a high impedance state. Table 6. Power Modes PD1 PD0 Power Mode Total Supply Current (mA) Output Impedance Low Low Full Power 23.6 Low Low High ¾ Power 15.8 Low High Low ½ Power 10.4 Low High High Power-Down 1.8 High EXPOSED THERMAL PAD CONNECTIONS The exposed thermal pad on the 10-lead MSOP is both the reference for the PD pins and the only electrical connection for the negative supply voltage. Therefore, in the 10-lead MSOP, the ADA4311-1 can only be used on a single supply. The exposed thermal pad must be connected to ground. Failure to do so renders the part inoperable. A requirement for this package is that the thermal pad be connected to a solid plane with low thermal resistance, ensuring adequate heat transfer away from the die and into the board. POWERLINE APPLICATION Applications (that is, powerline AV modems) requiring greater than 10 dBm peak power should consider using an external line driver, such as the ADA4311-1. Figure 22 shows an example interface between the TxDAC® output and the ADA4311-1 biased for single-supply operation. The peak-to-peak differential output voltage swing of the TxDAC should be limited to 2 V p-p, with the gain of the ADA4311-1 configured to realize the additional voltage gain required by the application. A low- pass filter should be considered to filter the DAC images inherent in the signal reconstruction process. In addition, dc blocking capacitors are required to level-shift the output signal of the TxDAC to the common-mode level of the ADA4311-1 (that is, VMID = VCC − GND/2). 0.1µF RSET IOUTP+ IOUTP– 0dB TO –7.5dB OPTIONAL LCLPF VMID ADA4311-1 ADA4311-1 1/2 1/2 TxDAC Figure 22. TxDAC Output Directly via Center-Tap Transformer |
Numéro de pièce similaire - AD4311-1 |
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Description similaire - AD4311-1 |
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