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ML2751DT Datasheet(PDF) 5 Page - Micro Linear Corporation |
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ML2751DT Datasheet(HTML) 5 Page - Micro Linear Corporation |
5 / 10 page ML2751 5 January, 2000 PRELIMINARY PRELIMINARY DATASHEET PIN DESCRIPTIONS (continued) Pin # Signal Name I/O Description PIN Diode Driver Section 12 PIN O (analog) This output is a low impedance voltage source that switches between VCC and GND to drive an external PIN diode switch. This totem pole output is tri-stated when FEEN = 0. When active it pulls either to VCC (if PAON = 1) or to GND (if PAON = 0), and has a nominal output impedance of 50 W when sourcing and 120W when sinking 13 PINB O (analog) This output is a low impedance voltage source that switches between VCC and GND to drive an external PIN diode switch. This totem pole output is tri-stated when FEEN = 0. When active it pulls either to VCC (if PAON = 0) or to GND (if PAON = 1) , and has a nominal output impedance of 50 W when sourcing and 120W when sinking. PINB is the complement of PIN, providing a bipolar drive for PIN diodes from a single power rail Control and Interface 1 PAON I (CMOS) Power Amplifier on pin. The PA is active when PAON = 1, and the LNA is active when PAON = 0. Rising and falling edges of this signal initiate a controlled ramp of the PA bias circuits to eliminate AM generated sidebands on the transmitter output. The PIN diode drivers are synchronized with PAON (see Figure 3). When the ML2751 is in standby mode this pin has no effect 2 FEEN I (CMOS) Front-end enable. FEEN is the master power down pin. When FEEN = 0 the ML2751 is in standby mode. When FEEN = 1 either the PA or the LNA is enabled (determined by the state of PAON). See Figure 3 Power & Ground 15 VCC Power Positive power supply for the LNA, the first stages of the PA, the PIN diode drivers, and the control logic. Care should be exercised in PCB layout to minimize the trace length, and the inductance and resistance both in the connection to the capacitor and from the capacitor to ground 4 GND Ground 6 GND Ground 7 GND Ground 8 GND Ground 14 GND Ground 16 GND Ground 17 GND Ground 19 GND Ground 20 GND Ground |
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