LTC5505 데이터 시트보기 (PDF) - Linear Technology

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LTC5505

RF Power Detector with Buffered Output and >40dB Dynamic Range

Linear Technology 

LTC5505-1/LTC5505-2

PI FU CTIO S

RFIN (Pin 1): 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 3GHz.

This pin has an internal 250Ω termination, an internal

Schottky diode detector and peak detector capacitor. (See

Note 6 in the Electrical Characteristics.)

GND (Pin 2): System Ground.

SHDN (Pin 3): Shutdown Input. A logic low on the SHDN

pin places the part in shutdown mode. A logic high enables

the part. SHDN has an internal 150k pull down resistor to

ensure that the part is in shutdown when the drivers are in

a tri-state condition.

VOUT (Pin 4): Buffered and Level Shifted Detector Output

Voltage.

VCC (Pin 5): Power Supply Voltage, 2.7V to 6V. VCC should

be bypassed with 0.1µF and 100pF ceramic capacitors.

BLOCK DIAGRA

(0Ω TO 20Ω FOR LTC5505-1,

0Ω FOR LTC5505-2)

RFSOURCE

33pF

VCC

5

1

RFIN

250Ω

GAIN

COMPRESSION

SHDN

GND 2

28pF

60µA

60µA

+

RF DET

–

150k

3

SHDN

130mV

22k

+

BUFFER

–

30k

30k

100Ω

100Ω

BIAS

4 VOUT

5505 BD

5

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