LTC4400-1 LINER [Linear Technology], LTC4400-1 Datasheet - Page 4

• Manufacturer Part Number: LTC4400-1
• Description: RF Power Controllers with 450kHz Loop BW and 45dB Dynamic Range
• Manufacturer: LINER [Linear Technology]

LTC4400-1/LTC4400-2
TYPICAL PERFOR A CE CHARACTERISTICS
PI FU CTIO S
4
RF (Pins 1/8): RF Feedback Voltage. This input is referenced
to V
LTC4400-1 and 300MHz to 2000MHz for the LTC4400-2.
This pin has an internal 250 termination, an internal
Schottky diode detector and peak detector capacitor.
GND (Pins 2/4): System Ground.
PCTL (Pins 3/5): 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 .
V
Output. This pin drives an external RF power amplifier
power control pin. The maximum load capacitance is
100pF.
PCB
10000
1000
U
100
CC
10
1
–22
(Pin 3): (LTC4400-2 Only) Power Control Voltage
. The frequency range is 300MHz to 2700MHz for the
LTC4400-1 Detector Characteristics
at 2700MHz
–18 –14
U
75 C
25 C
–30 C
RF INPUT POWER (dBm)
–10 –6 –2
U
2
(LTC4400-1/LTC4400-2)
W
6
10 14
4401 G04
U
10000
1000
100
10
1
–28
LTC4400-2 Detector Characteristics
at 900MHz
–22
75 C
25 C
–30 C
–16
RF INPUT POWER (dBm)
–10
SHDN (Pins 4/6): Shutdown Input. A logic low on the SHDN
pin places the part in shutdown mode. A logic high places
the part in enable mode. SHDN has an internal 150k pull-
down resistor to ensure that the part is in shutdown when
the drivers are in a three-state condition.
V
drives an external RF power amplifier power control pin.
The maximum load capacitance is 100pF.
V
should be bypassed with 0.1 F and 100pF ceramic capaci-
tors. Used as return for RF 250 termination.
BSEL (Pin 7): (LTC4400-2 Only) Selects V
and V
resistor to ground.
–4
PCA
CC
(Pins 6/1): Input Supply Voltage, 2.7V to 6V. V
2
(Pins 5/2): Power Control Voltage Output. This pin
PCB
8
when High. This input has an internal 150k
4400 G05
14
10000
1000
100
10
1
–26
LTC4400-2 Detector Characteristics
at 1800MHz
–20
75 C
25 C
–30 C
RF INPUT POWER (dBm)
–14
–8
–2
PCA
4
when Low
sn4400 4400fas
10
4400 G06
16
CC