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ADL5502 Arkusz danych(PDF) 10 Page - Analog Devices |
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ADL5502 Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 14 page ADL5502 Preliminary Technical Data Rev. PrD (04/20/2008) | Page 10 of 14 APPLICATIONS BASIC CONNECTIONS Figure 17 shows the basic connections for the ADL5502. The device is powered by a single supply between 2.5 V and 3.5 V, with a quiescent current of 5 mA. The VPOS pin is decoupled using 100 pF and 0.1 μF capacitors. Placing a single 75 Ω resistor at the RF input provides a broadband match of 50 Ohms. More precise resistive or reactive matches can be applied for narrow frequency band use (see impedance plot, Figure 7). The rms averaging can be augmented by placing additional capacitance at CFLT. The ac residual can be further reduced by increasing the output capacitance, COUT. The combination of the internal 100 Ω output resistance and COUT produce a low- pass filter to reduce output ripple of the VRMS output. Note that a minimum of 4.7 nF capacitive load should be kept on the RMS output. To operate the device in peak-hold mode, the control line must be temporally set to HI (reset or envelope mode) and then set back to LO (peak-hold mode). This allows the ADL5502 to be initialize to a known state. Figure 17. Basic Connections for ADL5502 EVALUATION BOARD Figure 18 shows the schematic of the ADL5502 evaluation board. The board is powered by a single supply in the 2.5 V to 3.5 V range. The power supply is decoupled by 100 pF and 0.1 μF capacitors. Table 4 details the various configuration options of the evaluation board. Figure 19 and Figure 20 show the component and circuit layouts of the evaluation board. The RF input has a broadband match of 50 Ohms using a single 75 Ω resistor at R10. More precise matching at spot frequencies is possible using the pads for components C15, C16, and R10. The two outputs, accessible via the SMAs labeled VRMS and VENV, provide the rms response and the envelope/peak-hold vmeasurement of the RF input power level. The device must be enabled by switching SW1 to HI (setting the switch to the position opposite that of the “SW1” label). The device is place in peak-hold mode by placing switch SW2 in the position closes to the “SW2” label. Envelope-tracking mode is possible by setting SW2 in the opposite switch position (away from the “SW2” label). A signal generator can drive the control mode via the SMA labeled CNTL (see Table 4 for more details). OPERATING IN PEAK-HOLD MODE To operate the device in peak-hold mode, the control line must be temporally set to HI (envelope mode) and then set back to LO (peak-hold mode). This allows the ADL5502 to be initialize to a known state. For envelope mode or rms use only, the control line can simply be set to HI. |
Podobny numer części - ADL5502 |
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Podobny opis - ADL5502 |
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