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LTC1957-1 Datasheet(PDF) 4 Page - Linear Technology |
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LTC1957-1 Datasheet(HTML) 4 Page - Linear Technology |
4 / 16 page 4 LTC1957-1/LTC1957-2 VIN (Pin 1): Input Supply Voltage, 2.7V to 6V. VIN should be bypassed with 0.1 µF and 100pF ceramic capacitors. Used as return for RF 200 Ω termination. RF (Pin 2): RF Feedback Voltage from the Directional Coupler. Referenced to VIN. A coupling capacitor of 33pF must be used to connect to the ground referenced direc- tional coupler. The frequency range is 850MHz to 2000MHz. This pin has an internal 200 Ω termination, an internal Schottky diode detector and peak detector capacitor. SHDN (Pin 3): Shutdown Input. A logic low on the SHDN pin places the part in shutdown mode. A logic high places the part in autozero when TXEN is low. SHDN has an inter- nal 150k pull-down resistor to ensure that the part is in shut- down when the drivers are in a three-state condition. BSEL (Pin 4): (LTC1957-2 Only) Selects VPCA when low and VPCB when high. This input has an internal 150k resistor to ground. GND (Pin 5/Pin 4): System Ground. PCTL (Pin 6/Pin 5): Analog Input. The external power control DAC drives this input. The amplifier servos the RF power until the RF detected signal equals the DAC signal. The input impedance is typically 90k Ω. TXEN (Pin 7/Pin 6): Transmit Enable Input. A logic high enables the control amplifier. When TXEN is low and SHDN is high the part is in the autozero mode. This input has an internal 150k resistor to ground. VPCB (Pin 8): (LTC1957-2 Only) Power Control Voltage Output. This pin drives an external RF power amplifier power control pin. The maximum load capacitance is 100pF. The output is capable of rail-to-rail swings at low load currents. Selected when BSEL is high. VPCA (Pin 9/Pin 7): Power Control Voltage Output. This pin drives an external RF power amplifier power control pin. The maximum load capacitance is 100pF. The output is capable of rail-to-rail swings at low load currents. Selected when BSEL is low (LTC1957-2 only). VCC (Pin 10/Pin 8): RF Power Amplifier Supply. This pin has an internal 0.050 Ω sense resistor between VIN and VCC that senses the RF power amplifier supply current to detect overcurrent conditions. (LTC1957-2/LTC1957-1) PI FU CTIO S TYPICAL PERFOR A CE CHARACTERISTICS Detector Characteristics at 900MHz Detector Characteristics at 1800MHz RF INPUT POWER (dBm) 10 100 1000 10000 –26 –14 –8 –2 4 10 1 –20 16 1957 G01 VIN = 3V TO 4.4V –30 °C 75 °C 25 °C RF INPUT POWER (dBm) 10 100 1000 10000 –24 –16 –12 –8 –4 0 4 8 1 –20 12 16 1957 G02 VIN = 3V TO 4.4V –30 °C 75 °C 25 °C |
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