LTC5535| Datasheet

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LTC5535 Precision 600MHz to 7GHz, RF Detector with Adjustable Gain and 12MHz Baseband Bandwidth

FEATURES

DESCRIPTIO

Temperature Compensated Internal Schottky Diode RF Detector Wide Input Frequency Range: 600MHz to 7GHz* Wide Input Power Range: 32dBm to 10dBm External Gain Control Precision VOUT Offset Control Low Starting Voltage: 200mV for Gain = 2 Wide VCC Range of 2.7V to 5.5V Low Operating Current: 2mA Available in a Low Profile (1mm) SOT-23 Package

The LTC 5535 is an RF power detector for RF applications operating in the 600MHz to 7GHz range. A temperature compensated Schottky diode peak detector and output amplifier are combined in a small ThinSOTTM package. The supply voltage range is optimized for operation from a single cell lithium-ion or three cell NiMH battery. The RF input voltage is peak detected using an on-chip Schottky diode. The detected voltage is buffered and supplied to the VOUT pin. The LTC5535 output amplifier gain is set via external resistors. The initial starting voltage of 200mV can be precisely adjusted using the VOS pin. The LTC5535 operates with input power levels from 32dBm to 10dBm. The 12MHz baseband bandwidth is much higher than that of previous Schottky detector products.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. *Higher frequency operation is achievable with reduced performance. Consult factory for more information.

APPLICATIO S

802.11a, 802.11b, 802.11g, 802.15, 802.16 Multimode Mobile Phone Products Optical Data Links Wireless Data Modems Wireless and Cable Infrastructure RF Power Alarm Envelope Detector

TYPICAL APPLICATIO

Output Voltage vs RF Input Power 600MHz to 7GHz RF Power Detector
33pF RF INPUT 1
VOUT OUTPUT VOLTAGE (mV)

3600

VCC = 3.6V 3200 TA = 25 C GAIN = 2 2800 VOS = 0V 2400 2000

LTC5535 VCC 6 RFIN 100pF 5 RA VOS VM
5535 TA01

VCC 0.1uF

2

GND

VOUT

1600 1200

VOS REFERENCE

3

4 RB

800 400 0 32 28 24 20 16 12 8 4 0 4 RF INPUT POWER (dBm) 8 12
5535 TA02

U
2GHz 600MHz 1GHz 5GHz 6GHz 7GHz 4GHz
5535f

U

U

1

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LTC5535 DATASHEET