LTC4401-2_15 datasheet(4/16 Pages) LINER

Part #	LTC4401-2

Description	RF Power Controllers with 250kHz Loop BW and 45dB Dynamic Range

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Manufacturer	LINER [Linear Technology]

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LTC4401-1/LTC4401-2

4401fa

RF (Pins 1/8): RF Feedback Voltage from the Directional

Coupler. Referenced to VCC. A coupling capacitor of 33pF

must be used to connect to the ground referenced direc-

tional coupler. The frequency range is 300MHz to 2700MHz

for the LTC4401-1 and 300MHz to 2000MHz for the

LTC4401-2. This pin has an internal 250

Ω termination, an

internal Schottky diode detector and peak detector capaci-

tor.

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

Ω.

VPCB (Pin 3): (LTC4401-2 Only) Power Control Voltage

Output. This pin drives an external RF power amplifier

power control pin. The maximum load capacitance is

100pF.

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.

VPCA (Pins 5/2): Power Control Voltage Output. This pin

drives an external RF power amplifier power control pin.

The maximum load capacitance is 100pF.

VCC (Pins 6/1): Input Supply Voltage, 2.7V to 6V. VCC

should be bypassed with 0.1

µFand100pFceramiccapaci-

tors. Used as return for RF 250

Ω termination.

BSEL (Pin 7): (LTC4401-2 Only) Selects VPCA when Low

and VPCB when High. This input has an internal 150k

resistor to ground.

PI FU CTIO S

LTC4401-1 Detector Characteristics

at 2700MHz

RF INPUT POWER (dBm)

10

100

1000

10000

–22

–10 –6 –2

6

210

14

1

–18 –14

4401 G04

75

°C

25

°C

–30

°C

TYPICAL PERFOR A CE CHARACTERISTICS

(LTC4401-1/LTC4401-2)

LTC4401-2 Detector Characteristics

at 900MHz

LTC4401-2 Detector Characteristics

at 1800MHz

RF INPUT POWER (dBm)

10

100

1000

10000

–28

–10

2

8

1

–22

–4

14

–16

4401 G05

75

°C

25

°C

–30

°C

RF INPUT POWER (dBm)

10

100

1000

10000

–26

–14

–8

–2

4

10

16

1

–20

4401 G06

75

°C

25

°C

–30

°C

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