LTC5530ES6 查看數據表（PDF） - Linear Technology

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LTC5530ES6

Precision 300MHz to 7GHz RF Detector with Shutdown and Gain Adjustment

Linear Technology 

LTC5530

APPLICATIO S I FOR ATIO

Operation

The LTC5530 RF detector integrates several functions to

provide RF power detection over frequencies ranging from

300MHz to 7GHz. These functions include an internal fre-

quency compensated buffer amplifier, an RF Schottky di-

ode peak detector and level shift amplifier to convert the RF

input signal to DC and a delay circuit to avoid voltage tran-

sients at VOUT when powering up. The LTC5530 has both

shutdown and gain setting capabilities.

Buffer Amplifier

The output buffer amplifier is capable of supplying typi-

cally 4mA into a load. The negative terminal VM is brought

out to a pin for gain selection. External resistors connected

between VOUT and VM (RA) and VM to ground (RB) will set

the amplifier gain.

GAIN = 1+ RA

RB

The amplifier is unity gain stable; however a minimum gain

of two is recommended to improve low output voltage

accuracy. The amplifier bandwidth is 2MHz for a gain of 2.

For increased gain applications, the bandwidth is reduced

according to the formula:

BANDWIDTH = 4MHz = 4MHz • RB

(GAIN)

(RA + RB)

A capacitor can be placed across the feedback resistor RA

to shape the frequency response. In addition the amplifier

can be used as a comparator. VM can be connected to a

reference voltage. When the internal detector voltage

(which is connected to the positive input of the buffer

amplifier) exceeds the external voltage of VM, VOUT will

switch high.

RF Detector

The internal RF Schottky diode peak detector and level

shift amplifier converts the RF input signal to a low

frequency signal. The detector demonstrates excellent

efficiency and linearity over a wide range of input power.

The Schottky diode is biased at about 55µA and drives a

25pF internal peak detector capacitor.

Shutdown

The part is in shutdown mode when SHDN is low. The

supply current is reduced to < 2µA and VOUT is shorted to

ground via a 280Ω resistor. When SHDN is asserted high,

the part is enabled after about 8µs.

Demo Board Schematic

C4 LTC5530ES6

RFIN

39pF

1

6

RFIN VCC

R1

(OPT)

R2

22k

VCC

2

5

GND VOUT

3

4

SHDN VM

SHDN

C2

100pF

VCC

2.7V TO 6V

C1

0.1µF

VOUT

R3

C3

10k

(OPT)

R4

10k

5530 DB

5530f

9

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