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

The LTC5531 is an RF power detector for RF applications operating in the 300MHz to 7GHz range. A temperature compensated Schottky diode peak detector and buffer amplifier are combined in a small ThinSOT™ package. The supply voltage range is optimized for operation from a single lithium-ion cell or 3xNiMH.

The RF input voltage is peak detected using an on-chip Schottky diode. The detected voltage is buffered and supplied to the VOUT pin. A power saving shutdown mode reduces current to less than 2µA. The initial offset voltage of 120mV ±35mV can be precisely adjusted using the VOS pin.

The LTC5531 operates with input power levels from –32dBm to 10dBm.

*Higher frequency operation is achievable with reduced performance. Consult factory for more information.

Applications

* 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

* Temperature Compensated Internal Schottky Diode RF Detector

* Wide Input Frequency Range: 300MHz to 7GHz*

* Wide Input Power Range: –32dBm to 10dBm

* Buffered Detector Output

* Precision VOUT Offset Control

* Wide VCC Range of 2.7V to 6V

* Low Operating Current: 500µA

* Low Shutdown Current: <2µA

* Available in a Low Profile (1mm) SOT-23 Package