For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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
POWER DETECTORS - SMT
1
HMC948LP3E
v02.0913
54 dB, LOGARITHMIC
DETECTOR, 1 - 23 GHz
The HMC948LP3E Logarithmic Detector converts
RF signals at its input, to a proportional DC voltage
at its output. The HMC948LP3E employs successive
compression topology which delivers high dynamic
range over a wide input frequency range. As the input
power is increased, successive ampliers move into
saturation one by one creating an approximation of
the logarithm function. The output of a series of square
law detectors is summed, converted into the voltage
domain and buffered to drive the LOG OUT output.
The HMC948LP3E provides a nominal logarithmic
slope of +14.2 mV/dB and an intercept of -111 dBm at
23 GHz. Ideal as a log detector for high volume micro-
wave radio and VSAT applications, the HMC948LP3E
is housed in a compact 3x3 mm RoHS compliant SMT
plastic package.
General Description
Features
Functional Diagram
Wide Input Bandwidth: 1 to 23 GHz
Wide Dynamic Range: 54 dB up to 23 GHz
Single Positive Supply: +3.3V
Excellent Stability Over Temperature
Fast Rise / Fall Time: 5 / 7 ns
16 Lead 3x3 mm SMT Package: 9 mm²
Typical Applications
The HMC948LP3E is ideal for:
• Point-to-Point Microwave Radio
• VSAT
• Wideband Power Monitoring
• Receiver Signal Strength Indication (RSSI)
• Test & Measurement
Electrical Specications, TA = +25 C Vcc = +3.3V
Parameter Typ. Typ. Typ. Ty p. Typ. Typ. Typ. Units
Input Frequency[1] 1 5 10 14 18 20 23 GHz
±3 dB Dynamic Range 53 54 54 55 55 55 55 dB
±3 dB Dynamic Range Center -23 -25 -24 -22 -20 -15 -15 dBm
Log Error Over Temperature (-40 to +85) ±1 ±1 ±1 ±1.5 ±1.5 ±1.5 ±1.5 dB
Output Intercept -104 -107 -109 -112 -113 -108 -111 dBm
Output Slope 16.8 16.7 15.9 15.2 14.6 14.4 14.2 mV/dB
[1] Video output load should be 1K Ohm or higher.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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
POWER DETECTORS - SMT
2
HMC948LP3E
v02.0913
54 dB, LOGARITHMIC
DETECTOR, 1 - 23 GHz
Electrical Specications, (continued)
Parameter Conditions Min. Typ. Max. Units
LOGOUT Interface
Output Voltage Range 0.9 1.8 V
Output Rise Time [1] / Fall Time [2] f = 10 GHz 5 / 7 ns
Power Supply (Vcc)
Operating Voltage Range 3.15 3.3 3.45 V
Supply Current in Normal Mode 91 mA
[1] 0 dBm Input Pulsed; measured from 10% to 90%
[2] 0 dBm Input Pulsed; measured from 90% to 10%
LOG OUT & Error
vs. Input Power, Fin = 5 GHz
LOG OUT & Error
vs. Input Power, Fin = 1 GHz
Unless otherwise noted: Vcc = +3.3V, TA = +25 °C
LOG OUT & Error
vs. Input Power, Fin = 14 GHz
LOG OUT & Error
vs. Input Power, Fin = 10 GHz
0.5
1
1.5
2
-3
-2
-1
0
1
2
3
-60 -50 -40 -30 -20 -10 0 10
ERR +25 C
ERR +85 C
ERR -40 C
Ideal
Log Out +25 C
Log Out +85 C
Log Out -40 C
LOG OUT (V)
ERROR (dB)
INPUT POWER (dBm)
0.5
1
1.5
2
-3
-2
-1
0
1
2
3
-60 -50 -40 -30 -20 -10 0 10
ERR +25 C
ERR +85 C
ERR -40 C
Ideal
Log Out +25 C
Log Out +85 C
Log Out -40 C
LOG OUT (V)
ERROR (dB)
INPUT POWER (dBm)
0.5
1
1.5
2
-3
-2
-1
0
1
2
3
-60 -50 -40 -30 -20 -10 0 10
ERR +25 C
ERR +85 C
ERR -40 C
Ideal
Log Out +25 C
Log Out +85 C
Log Out -40 C
LOG OUT (V)
ERROR (dB)
INPUT POWER (dBm)
0.5
1
1.5
2
-3
-2
-1
0
1
2
3
-60 -50 -40 -30 -20 -10 0 10
ERR +25 C
ERR +85 C
ERR -40 C
Ideal
Log Out +25 C
Log Out +85 C
Log Out -40 C
LOG OUT (V)
ERROR (dB)
INPUT POWER (dBm)
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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
POWER DETECTORS - SMT
3
HMC948LP3E
v02.0913
54 dB, LOGARITHMIC
DETECTOR, 1 - 23 GHz
LOG OUT & Error
vs. Input Power, Fin = 18 GHz
Unless otherwise noted: Vcc = +3.3V, TA = +25 °C
LOG OUT & Error
vs. Input Power, Fin = 20 GHz
LOG OUT & Error
vs. Input Power, Fin = 23 GHz LOG OUT vs. Frequency
0.5
1
1.5
2
-3
-2
-1
0
1
2
3
-60 -50 -40 -30 -20 -10 0 10
ERR +25 C
ERR +85 C
ERR -40 C
Ideal
Log Out +25 C
Log Out +85 C
Log Out -40 C
LOG OUT (V)
ERROR (dB)
INPUT POWER (dBm)
0.5
1
1.5
2
-3
-2
-1
0
1
2
3
-60 -50 -40 -30 -20 -10 0 10
ERR +25 C
ERR +85 C
ERR -40 C
Ideal
Log Out +25 C
Log Out +85 C
Log Out -40 C
LOG OUT (V)
ERROR (dB)
INPUT POWER (dBm)
0.5
1
1.5
2
-3
-2
-1
0
1
2
3
-60 -50 -40 -30 -20 -10 0 10
ERR +25 C
ERR +85 C
ERR -40 C
Ideal
Log Out +25 C
Log Out +85 C
Log Out -40 C
LOG OUT (V)
ERROR (dB)
INPUT POWER (dBm)
0.5
0.75
1
1.25
1.5
1.75
2
-60 -50 -40 -30 -20 -10 0 10
1 GHz
5 GHz
10 GHz
14 GHz
18 GHz
20 GHz
23 GHz
INPUT POWER (dBm)
LOG OUT (V)
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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
POWER DETECTORS - SMT
4
HMC948LP3E
v02.0913
54 dB, LOGARITHMIC
DETECTOR, 1 - 23 GHz
Unless otherwise noted: Vcc = +3.3V, TA = +25 °C
Rise Time for Various Frequencies @ 0 dBm
Input Return Loss
Fall Time for Various Frequencies @ 0 dBm
0.8
1
1.2
1.4
1.6
1.8
0 20 40 60 80 100
2 GHz
10 GHz
18 GHz
TIME (ns)
LOG OUT (V)
0.8
1
1.2
1.4
1.6
1.8
0 20 40 60 80 100
2 GHz
10 GHz
18 GHz
TIME (ns)
LOG OUT (V)
-20
-15
-10
-5
0
0 5 10 15 20 25 30
+25 C
+85 C
-40 C
FREQUENCY (GHz)
RETURN LOSS (dB)
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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
POWER DETECTORS - SMT
5
HMC948LP3E
v02.0913
54 dB, LOGARITHMIC
DETECTOR, 1 - 23 GHz
Absolute Maximum Ratings
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Vcc +3.6V
RF Input Power +15 dBm
Junction Temperature 125 °C
Continuous Pdiss (T = 85°C)
(Derate 11.62 mW/°C above 85°C) 0.46W
Thermal Resistance (Rth)
(junction to ground paddle) 86.09 °C/W
Storage Temperature -65 to +150 °C
Operating Temperature -40 to +85 °C
ESD Sensitivity (HBM) Class 1A
Outline Drawing
Part Number Package Body Material Lead Finish MSL Rating Package Marking [1]
HMC948LP3E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] 948
XXX
[1] 4-Digit lot number XXXX
[2] Max peak reow temperature of 260 °C
Package Information
NOTES:
1. LEADFRAME MATERIAL: COPPER ALLOY
2. DIMENSIONS ARE IN INCHES [MILLIMETERS].
3. LEAD SPACING TOLERANCE IS NON-CUMULATIVE
4. PAD BURR LENGTH SHALL BE 0.15mm MAXIMUM.
PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM.
5. PACKAGE WARP SHALL NOT EXCEED 0.05mm.
6. ALL GROUND LEADS AND GROUND PADDLE MUST
BE SOLDERED TO PCB RF GROUND.
7. REFER TO HMC APPLICATION NOTE FOR SUGGESTED PCB LAND PATTERN.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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
POWER DETECTORS - SMT
6
HMC948LP3E
v02.0913
54 dB, LOGARITHMIC
DETECTOR, 1 - 23 GHz
Pin Number Function Description Interface Schematic
1, 4, 5, 8, 9,
10, 12 N/C No connection necessary. These pins may be connected to
RF/DC ground without affecting performance.
2RFIN RF input pin.
3, 6, 7 GND These pins and the exposed package bottom must be
connected to a high quality RF/DC ground.
11 LOG OUT Log out load should be at least 1K Ohm or higher.
13 - 16 Vcc
Bias Supply. Connect supply voltage to
these pins with appropriate ltering.
To ensure proper start-up supply rise time
should be faster than 100usec
Pin Descriptions
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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
POWER DETECTORS - SMT
7
HMC948LP3E
v02.0913
54 dB, LOGARITHMIC
DETECTOR, 1 - 23 GHz
Application & Evaluation PCB Schematic
Note: Log output load should be 1K Ohm or higher.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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
POWER DETECTORS - SMT
8
HMC948LP3E
v02.0913
54 dB, LOGARITHMIC
DETECTOR, 1 - 23 GHz
Evaluation PCB
The circuit board used in the application should
use RF circuit design techniques. Signal lines
should have 50 ohm impedance while the pckage
ground leads and exposed paddle should be con-
nected directly to the ground plane similar to that
shown. A sufficient number of via holes should be
used to connect the top and bottom ground planes.
The evaluation circuit board shown is available from
Hittite upon request.
List of Materials for Evaluation PCB 132032 [1]
Item Description
J1 K-Type Connector
J2 SMA Connector
J3, J4 DC Pin
C1 5 pF Capacitor, 0402 Pkg.
C2, C3 10 nF Capacitor, 0402 Pkg.
C4 4.7 µF Tantalum Capacitor, CASE A Pkg.
U1 HMC948LP3E Log Detector
PCB [2] 600-00008-00 Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350 or Arlon 25 FR