HMC714LP5 Datasheet, PDF (27/40 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
12
Dual RMS Detection Channels
The HMC714LP5E integrates two HMC614LP4E RMS detection channels with shared bias and control circuitry. The
linear-in-dB channel outputs at the RMS_A and RMS_B pins provide RMS detection performance in terms of dynamic
range, temperature stability, and logarithmic linearity similar to Hittite’s HMC614LP4E with improved frequency
detection range extending up to 5.8 GHz. Proprietary design techniques enable extremely good matching between
channels (within less than 0.5 dB with single-ended cnfiguration) over a wide range of input frequencies with low
temperature drift.
HMC714LP5E also provides “channel difference” outputs via pins OUTP and OUTN that can be either used differentially
or single-ended. The V_LVL input is used to set the common mode reference level for those outputs. On the Hittite
evaluation board, the V_LVL pin is shorted to V_REF2 output to provide a nominal bias voltage of 2.5V; but any external
bias voltage can be used to set V_LVL.
Channel Difference Outputs @ 1900 MHz,
Channel A Power Swept,
Channel B @ -25 dBm
4
3.5
3
2.5
2
1.5
1
OUTP
OUTN
0.5
RMSA
RMSB
0
-65 -55 -45 -35 -25 -15 -5
5
15
CHANNEL A INPUT POWER (dBm)
A ratio of two signal powers is a simple difference in the log domain. The OUTP and OUTN outputs can provide a
direct read of input signal power ratio between the signals presented to the two power detection channels.
When OUTP is connected directly to FBK_A
OUTP = RMS_A - RMS_B + V_LVL
And when OUTN is connected directly to FBK_B
OUTN = RMS_B - RMS_A+V_LVL
With the channels of HMC714LP5E having very low mismatch, channel outputs RMS_A and RMS_B track very closely
over temperature. The difference operation also allows the OUTP and OUTN to reject common-mode changes in
channels A and B.
HMC714LP5E also features iPAR output on each power detector. The RMS_A and RMS_B outputs provide a read of
average input signal (i.e True RMS power). The INS_A and INS_B pins are iPAR outputs providing a simultaneous read
of input signal Peak Power, Peak-to-Average Ratio, and RF waveshape. Refer to the section under “iPAR – Envelope
Power Normalized To Average Power” for more details on iPAR measurements.
12 - 140
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