LT5537 データシートの表示（PDF） - Linear Technology

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LT5537

Wide Dynamic Range RF/IF Log Detector

Linear Technology 

FEATURES

■ Low Frequency to 1000MHz Operation

■ 83dB Dynamic Range with ±1dB Nonlinearity

at 200MHz

■ Sensitivity –76dBm or Better at 200MHz

■ Log-Linear Transfer Slope of 20mV/dB

■ Supply Voltage Range: 2.7V to 5.25V

■ Supply Current: 13.5mA at 3V

■ Tiny 8-Lead (3mm × 2mm) DFN Package

U

APPLICATIO S

■ Linear-to-Log Signal Level Conversion

■ Received Signal Strength Indication (RSSI)

■ RF Power Control

■ RF/IF Power Detection

■ Receiver RF/IF Gain Control

■ Envelope Detection

■ ASK Receiver

TYPICAL APPLICATIO

7k

7k

RF IN

15nF

IN+

2

15nF

IN–

3

OPTIONAL

4

CAP+

5

CAP–

OFFSET

CANCELLATION

DETECTOR CELLS

ENBL

1

BANDGAP REFERENCE

AND BIASING

EXPOSED PAD

9

LT5537

Wide Dynamic Range

RF/IF Log Detector

DESCRIPTIO

The LT®5537 is a wide dynamic range RF/IF detector,

operational from below 10MHz to 1000MHz. The lower

limit of the operating frequency range can be extended to

near DC by the use of an external capacitor. The input

dynamic range at 200MHz with ±3dB nonlinearity is 90dB

(from –76dBm to 14dBm, single-ended 50Ω input). The

detector output voltage slope is nominally 20mV/dB, and

the typical temperature coefficient is 0.01dB/°C at 200MHz.

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

VCC

6

OUTPUT

BUFFER

OUT

8

7.2k

VEE

7

5537 TA01a

Output Voltage, Linearity Error

vs Input Power at 200MHz

2.4

3

2.0

2

1nF

1µF

85°C

25°C

1.6

1

1.2 –40°C

0

0.8

–1

0.4

–2

VCC = ENBL = 3V

0

–80 –60 –40 –20

0

INPUT POWER (dBm)

–3

20

5537 TA01b

5537fa

1

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