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ML2751DT Folha de dados(PDF) 7 Page - Micro Linear Corporation |
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ML2751DT Folha de dados(HTML) 7 Page - Micro Linear Corporation |
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7 / 10 page  ML2751 7 January, 2000 PRELIMINARY PRELIMINARY DATASHEET OPERATION MODES AND CONTROL INTERFACE DESCRIPTION The signals FEEN and PAON determine the mode of operation. The three standard modes of operation are STANDBY, TRANSMIT, and RECEIVE. The control logic is shown in Table 1. STANDBY: All circuits are off (LNA bias off), PIN driver outputs are Tri-stated. TRANSMIT: PA and the PIN diode drivers are enabled. The LNA is off (zero current). RECEIVE: The LNA bias circuits and the PIN diode drivers are enabled, PA is disabled. In addition to the two mode control inputs, FEEN and PAON, there is an analog voltage input that can be used to set the power output of the amplifier. The voltage range Table 1. Control Logic required to set the output power level can be controlled by an external resistor. Note that the ML2751 has an internal power amplifier ramp-on and ramp-off circuit. The power amplifier turn on/off relative to the ramp is shown in Figure 3. The ramp- on starts when the PA is enabled, the ramp-off starts when it is disabled. Two outputs, PIN and PINB, are provided from the ML2751 to drive the external PIN diodes in the Transmit/ Receive switch. The timing for these voltage outputs is shown in Figure 3 relative to the control pins FEEN and PAON. Figure 3. Signals vs. Mode Relationships FEEN PAON PIN PINB 3µs 3µs PA RF Envelope Tri-state Tri-state STANDBY STANDBY TRANSMIT RECEIVE N E E FN O A Pe d o MN I PB N I PA N LA P 0X Y B D N A T Se t a t s - i r Te t a t s - i r Tf f Of f O 10 E V I E C E RA m 0 1 - / C C VA m 0 1 + / C C Vn Of f O 11 T I M S N A R TA m 0 1 + / C C VA m 0 1 - / C C Vf f On O FUNCTIONAL DESCRIPTION |
Nº de peça semelhante - ML2751DT |
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Descrição semelhante - ML2751DT |
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