For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824

Phone: 978-250-3343

Fax: 978-250-3373

Order On-line at www.hittite.com

Application Support: Phone: 978-250-3343 or apps@hittite.com

11

11 - 21

HMC909LP4E

v02.0511

RMS POWER DETECTOR

SINGLE-ENDED, DC - 5.8 GHz

Layout Considerations

• Mount RF input coupling capacitors close to the IN+ and IN- pins.

• Solder the heat slug on the package underside to a grounded island which can draw heat away from the die with

low thermal impedance. the grounded island should be at rF ground potential.

• Connect power detector ground to the RF ground plane, and mount the supply decoupling capacitors close

to the supply pins.

Definitions:

• Log-slope: slope of PIN –> RMSOUT transfer characteristic. In units of mV/dB

• Log-intercept: x-axis intercept of PIN –> RMSOUT transfer characteristic. In units of dBm.

• RMS Output Error: The difference between the measured PIN and actual PIN using a line of best fit.

[measured_PIN] = [measured_ RMSOUT] / [best-fit-slope] + [best-fit-intercept], dBm

• Input Dynamic Range: the range of average input power for which there is a corresponding RMS output

voltage with “RMS Output Error” falling within a specific error tolerance.

• Crest Factor: Peak power to average power ratio for time-varying signals.

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

For price, delivery, and to place orders: Analog Devices, Inc.,

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106

Phone: 781-329-4700 • Order online at www.analog.com

Application Support: Phone: 1-800-ANALOG-D