Datasheet LTC4401-1, LTC4401-2 (Analog Devices) - 4

LTC4401-1/LTC4401-2
W U TYPICAL PERFOR A CE CHARACTERISTICS LTC4401-1 Detector Characteristics LTC4401-2 Detector Characteristics LTC4401-2 Detector Characteristics at 2700MHz at 900MHz at 1800MHz
10000 10000 10000 75°C 75°C 75°C 25°C 25°C 25°C –30°C –30°C –30°C 1000 1000 1000 100 100 100 10 10 10 1 1 1 –28 –22 –16 –10 –4 2 8 14 PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) –22 –18 –14 –10 –6 –2 2 6 10 14 PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) PCTL REFERENCED DETECTOR OUTPUT VOLTAGE (mV) –26 –20 –14 –8 –2 4 10 16 RF INPUT POWER (dBm) RF INPUT POWER (dBm) RF INPUT POWER (dBm) 4401 G04 4401 G05 4401 G06
U U U PI FU CTIO S (LTC4401-1/LTC4401-2) RF (Pins 1/8):
RF Feedback Voltage from the Directional
SHDN (Pins 4/6):
Shutdown Input. A logic low on the SHDN Coupler. Referenced to VCC. A coupling capacitor of 33pF pin places the part in shutdown mode. A logic high places must be used to connect to the ground referenced direc- the part in enable mode. SHDN has an internal 150k pull- tional coupler. The frequency range is 300MHz to 2700MHz down resistor to ensure that the part is in shutdown when for the LTC4401-1 and 300MHz to 2000MHz for the the drivers are in a three-state condition. LTC4401-2. This pin has an internal 250Ω termination, an
V
internal Schottky diode detector and peak detector capaci-
PCA (Pins 5/2):
Power Control Voltage Output. This pin drives an external RF power amplifier power control pin. tor. The maximum load capacitance is 100pF.
GND (Pins 2/4):
System Ground.
VCC (Pins 6/1):
Input Supply Voltage, 2.7V to 6V. VCC
PCTL (Pins 3/5):
Analog Input. The external power control should be bypassed with 0.1µF and 100pF ceramic capaci- DAC drives this input. The amplifier servos the RF power tors. Used as return for RF 250Ω termination. until the RF detected signal equals the DAC signal. The
BSEL (Pin 7): (LTC4401-2 Only)
Selects V input impedance is typically 90kΩ. PCA when Low and VPCB when High. This input has an internal 150k
VPCB (Pin 3): (LTC4401-2 Only)
Power Control Voltage resistor to ground. Output. This pin drives an external RF power amplifier power control pin. The maximum load capacitance is 100pF. 4401fa 4