5533 查看數據表（PDF） - Linear Technology

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5533

300MHz to 11GHz Precision Dual RF Power Detector

Linear Technology 

LTC5533

APPLICATIO S I FOR ATIO

3600

VCC = 3.6V

3200 VOS = 0V

2800

2400

2000

1600

1200

800

TA = –40°C

TA = 25°C

400

TA = 85°C

0

–32 –28 –24 –20 –16 –12 –8 –4 0 4 8 12

RF INPUT POWER (dBm)

5533 F01

Figure 1. Typical Detector Characteristics, 11GHz

1000

VCC = 3.6V

VOS = 0V

100

TA = –40°C

TA = 85°C

10

TA = 25°C

Figure 2 shows the corresponding slope of the 11GHz

response, and Figure 3 shows the variation of the output

voltage vs RF input power at – 40°C and 85°C, normalized

to the room temperature (25°C) results.

The LTC5533 can be used as a demodulator for AM and

ASK modulated signals with data rates up to 2MHz.

Depending on specific application needs, the detector

outputs can be split between two branches, providing AC-

coupled data (or audio) output and a DC-coupled RSSI

output for signal strength measurements and AGC.

The LTC5533 can also be used for RF power detection and

control. Figure 4 is an example of an LTC5533 used for

dual band mobile phone transmitter power control.

The LTC5533 consists of two separate RF detector dice

packaged together. Consequently, detector-to-detector

isolation is good—typically 45dB at 2GHz. Output match-

ing is good, but not precise. The characterization plots in

the Typical Performance Characteristics show that the

typical output voltage mismatch is within ±25mV with no

RF input signal present. With –14dBm RF input signal, the

typical equivalent mismatch is within ±1dB.

1

–32 –28 –24 –20 –16 –12 –8 –4 0 4 8

RF INPUT POWER (dBm)

5533 F02

Figure 2. VOUT Slope vs RF Input Power at 11GHz

3

VCC = 3.6V

VOS = 0V

2

1

TA = –40°C

0

–1

TA = 85°C

–2

–3

–24 –20 –16 –12 –8 –4 0 4

RF INPUT POWER (dBm)

8 12

5533 F03

Figure 3. VOUT Variation at –40°C and at 85°C vs RF Input Power

at 11GHz, Normalized to Room Temperature (25°C) Results.

10

C3 +

0.1µF

Li-Ion

LTC5533

1

VCC1

2

VOUT1

3

VOS1

4

VCC2

5

VOUT2

6

VOS2

12

RFIN1

11

GND

10

SHDN1

9

RFIN2

8

GND

7

SHDN2

20dB RESISTIVE TAP

C1

39pF R1

360Ω

ANTENNA

14dB RESISTIVE TAP

C2

39pF

R2

150Ω

CELL BAND

DIPLEXER

PCS BAND

MOBILE PHONE BB/DSP

VPC

BSE

5533 F04

Tx PA MODULE

Figure 4. Dual Band Mobile Phone Transmitter

Power Contol with LTC5533

5533f

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