HMC714LP5 Datasheet, PDF (30/40 Pages) Hittite Microwave Corporation – DUAL RMS POWER DETECTOR 0.1 - 3.9 GHz

v05.0309
HMC714LP5 / 714LP5E
DUAL RMS POWER DETECTOR
0.1 - 3.9 GHz
Configuration for the Typical Application
The RF inputs can be connected in either a differential or single-ended configuration: see “RF Input Interface” section
for details on each input configuration. With the appropriate input tuning components, the part can provide the full
performance with a single-ended input.
The RMS_A & RMS_B output signals are typically connected directly to V_SETA & V_SETB inputs, providing a Pin->V_RMS
transfer characteristic slope of 36.5 mV/dBm at both channels; however the RMS output can be re-scaled to “magnify”
a specific portion of the input sensing range, and to fully utilize the dynamic range of the RMS output. Refer to the
section under the “log-slope and intercept” for details.
The INS_A & INS_B pins are the instantaneous peak-to-average ratio (iPAR) outputs; on each detector. This iPAR
measurement pulls it’s signal from the internals of the RMS detector, just before the RMS calculation is processed.
Each iPAR output (INS_A & INS_B) produces a voltage signal which provides a direct read of the RF signal AM envelope.
So between the simultaneous measurement of RMS power and iPAR on each power detector, a system can monitor
average power, peak power, peak-to-average power, and the RF waveshape. See the section under “iPAR Envelope
Power Normalized to Average Power” for application details.
V_TGT with a nominal value of 2V is typically generated from the V_REF reference output of 3V; however the V_TGT
voltage can be adjusted to optimize measurement accuracy, especially when measurement at higher crest factors is
important: see “Adjusting V_TGT for greater precision” section for technical details.
Due to part-to-part variations in log-slope and log-intercept, a system-level calibration is recommended to satisfy
absolute accuracy requirements: refer to the “System Calibration” section for more details.
The HMC714LP5E requires a single 5V supply connected to three pins: V_CCA, V_CCB, and V_CCBIAS. Adequate power
supply decoupling is required on these pins. The supply pins should be decoupled to ground using two parallel
capacitors with the values shown in the application schematic. The capacitors should be placed close to the part (with
the smaller value as close as possible to the supply pin) and must provide a low impedance path to RF GND over the
entire input frequency range.
Temperature Sensor Interface
The HMC714LP5E provides a buffered PTAT temperature sensor output that provides a temperature scaling factor
of 2.2 mV/°C with a typical output voltage of 600 mV at 0°C. The output is capable of sourcing 1.5 mA.
12
TEMP Output
0.85
0.8
0.75
TEMP
Ideal
0.7
0.65
0.6
0.55
0.5
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE (Celcius)
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]
Order On-line at www.hittite.com
12 - 143