HMC425* Product Page Quick Links
Last Content Update: 11/01/2016
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Evaluation Kits
•HMC425LP3 Evaluation Board.
Documentation
Data Sheet
•HMC425 Die Datasheet
•HMC425LP3 Datasheet
Tools and Simulations
•HMC425_Die S-Parameter
•HMC425LP3 S-Parameter
Reference Materials
Quality Documentation
•Package/Assembly Qualification Test Report: 16L 3x3mm
QFN Package (QTR: 11003 REV: 02)
•Package/Assembly Qualification Test Report: LP2, LP2C,
LP3, LP3B, LP3C, LP3D, LP3F, LP3G (QTR: 2014-0364)
•Package/Assembly Qualification Test Report: Plastic
Encapsulated QFN (QTR: 05006 REV: 02)
•Semiconductor Qualification Test Report: MESFET-F
(QTR: 2013-00247)
Design Resources
•HMC425 Material Declaration
•PCN-PDN Information
•Quality And Reliability
•Symbols and Footprints
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
ATTENUATORS - DIGITAL - SMT
5
5 - 116
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz
Functional Diagram
Electrical Speci cations,
TA = +25° C, With Vdd = +5V & Vctl = 0/+5V (Unless Otherwise Noted)
The HMC425LP3 / HMC425LP3E is ideal for:
• WLAN & Point-to-Multi-Point
• Fiber Optics & Broadband Telecom
• Microwave Radio & VSAT
• Military
0.5 dB LSB Steps to 31.5 dB
Single Control Line Per Bit
± 0.5 dB Typical Bit Error
Single +5V Supply
3x3 mm SMT Package
The HMC425LP3 & HMC425LP3E are broadband
6-bit GaAs IC digital attenuators in low cost leadless
surface mount packages. Covering 2.2 to 8.0 GHz,
the insertion loss is less then 3.8 dB typical. The
attenuator bit values are 0.5 (LSB), 1, 2, 4, 8, and
16 dB for a total attenuation of 31.5 dB. Attenuation
accuracy is excellent at ± 0.5 dB typical step error
with an IIP3 of +40 dBm. Six control voltage inputs,
toggled between 0 and +3 to +5V, are used to select
each attenuation state. A single Vdd bias of +3 to +5V
is required.
Parameter Frequency
(GHz) Min. Typ. Max. Units
Insertion Loss 2.2 - 6.0 GHz
6.0 - 8.0 GHz
3.5
3.8
3.8
4.3
dB
dB
Attenuation Range 2.2 - 8.0 GHz 31.5 dB
Return Loss (RF1 & RF2, All Atten. States) 2.2 - 8.0 GHz 15 dB
Attenuation Accuracy:
(Referenced to Insertion Loss) All States 2.2 - 8.0 GHz ± 0.5 + 5% of Atten. Setting Max. dB
Input Power for 0.1 dB Compression Vdd = 5V
Vdd = 3V 2.2 - 8.0 GHz 22
19
dBm
dBm
Input Third Order Intercept Point
(Two-Tone Input Power= 0 dBm Each Tone)
REF - 16.0 dB States
16.5 - 31.5 dB States 2.2 - 8.0 GHz 45
35
dBm
dBm
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
2.2 - 8.0 GHz
160
180
ns
ns
HMC425LP3 / 425LP3E
v03.0409
Typical Applications Features
General Description
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
ATTENUATORS - DIGITAL - SMT
5
5 - 117
Return Loss RF1, RF2
(Only Major States are Shown)
Insertion Loss
Normalized Attenuation
(Only Major States are Shown)
Bit Error vs. Frequency
(Only Major States are Shown)
Relative Phase vs. Frequency
(Only Major States are Shown)
Bit Error vs. Attenuation State
-10
-8
-6
-4
-2
0
12345678910
+25 C
+85 C
-40 C
INSERTION LOSS (dB)
FREQUENCY (GHz)
-25
-20
-15
-10
-5
0
12345678910
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
RETURN LOSS (dB)
FREQUENCY (GHz)
-35
-30
-25
-20
-15
-10
-5
0
12345678910
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
NORMALIZED ATTENUATION (dB)
FREQUENCY (GHz)
-2
-1
0
1
2
0 4 8 12 16 20 24 28 32
2.4 GHz
3.5 GHz
5.5 GHz
8.0 GHz
BIT ERROR (dB)
ATTENUATION STATE (dB)
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
12345678910
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
BIT ERROR (dB)
FREQUENCY (GHz)
-40
-20
0
20
40
60
80
12345678910
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
RELATIVE PHASE (deg)
FREQUENCY (GHz)
HMC425LP3 / 425LP3E
v03.0409 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
ATTENUATORS - DIGITAL - SMT
5
5 - 118
Truth Table
Control Voltage
Bias Voltage & Current
Worst Case Step Error
Between Successive Attenuation States
Vdd Range = 3.0 to +5.0 Vdc
Vdd
(VDC)
Idd (Typ.)
(μA)
+3.0 10
+5.0 30
State Bias Condition
Low 0 to 0.2V @ 10 uA Typ.
High Vdd ± 0.2V @ 5 uA Typ.
Note: Vdd = +3V to +5V
Control Voltage Input Attenua-
tion State
RF1 - RF2
V1
16 dB
V2
8 dB
V3
4 dB
V4
2 dB
V5
1 dB
V6
0.5 dB
High High High High High High Reference
I.L.
High High High High High Low 0.5 dB
High High High High Low High 1 dB
High High High Low High High 2 dB
High High Low High High High 4 dB
High Low High High High High 8 dB
Low High High High High High 16 dB
Low Low Low Low Low Low 31.5 dB
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
-1.2
-0.8
-0.4
0
0.4
0.8
1.2
12345678910
STEP ERROR (dB)
FREQUENCY (GHz)
HMC425LP3 / 425LP3E
v03.0409 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
ATTENUATORS - DIGITAL - SMT
5
5 - 119
Absolute Maximum Ratings
Outline Drawing
Control Voltage (V1 to V6) Vdd +0.5 Vdc
Bias Voltage (Vdd) +7.0 Vdc
Staorage Temperature -65 to +150 °C
Operating Temperature -40 to +85 °C
RF Input Power (2.4 - 8.0 GHz) +30 dBm
ESD Sensitivity (HBM) Class 1A
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Part Number Package Body Material Lead Finish MSL Rating Package Marking [3]
HMC425LP3 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 [1] 425
XXXX
HMC425LP3E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] 425
XXXX
[1] Max peak re ow temperature of 235 °C
[2] Max peak re ow temperature of 260 °C
[3] 4-Digit lot number XXXX
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 HITTITE APPLICATION NOTE FOR SUGGESTED
LAND PATTERN.
HMC425LP3 / 425LP3E
v03.0409 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
ATTENUATORS - DIGITAL - SMT
5
5 - 120
Pin Descriptions
Pin Number Function Description Interface Schematic
1, 3, 10, 12 GND Package bottom has an exposed metal paddle
that must also be connected to RF ground.
2, 11 RFIN, RFOUT This pin is DC coupled and matched to 50 Ohm.
Blocking capacitors are required.
4, 5, 6, 7, 8, 9 V1 - V6 See truth table and control voltage table.
13, 14, 16 N/C This pin should be connected to PCB RF ground to
maximize performance.
15 Vdd Supply Voltage.
HMC425LP3 / 425LP3E
v03.0409 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
ATTENUATORS - DIGITAL - SMT
5
5 - 121
Evaluation PCB
The circuit board used in the nal application should
use RF circuit design techniques. Signal lines
should have 50 ohm impedance while the package
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.
* R1 - R6 = 100 Ohm.
These resistors are optional
and may be used to enhance
decoupling of the RF path
from the control inputs.
Item Description
J1 - J2 PCB Mount SMA Connector
J3 8 Pin DC Connector
C1 0.01 μF Capacitor, 0603 Pkg.
C2, C3 100 pF Capacitor, 0402 Pkg.
R1 - R6 100 Ohm Resistor, 0603 Pkg.
U1 HMC425LP3 / HMC425LP3E Digital Attenuator
PCB [2] 105260 Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350
List of Materials for Evaluation PCB 105408 [1]
HMC425LP3 / 425LP3E
v03.0409 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz
