ATTENUATORS - SMT
5
5 - 170
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
HMC540LP3 / 540LP3E
1 dB LSB GaAs MMIC 4-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 5.5 GHz
v00.0605
Functional Diagram
Electrical Speci cations,
TA = +25° C, With Vdd = +5V & Vctl = 0/+5V (Unless Otherwise Noted)
The HMC540LP3 / HMC540LP3E is ideal for both RF
and IF applications:
• Cellular Infrastructure
• ISM, MMDS, WLAN, WiMAX, WiBro
• Microwave Radio & VSAT
• Test Equipment and Sensors
1 dB LSB Steps to 15 dB
± 0.2 dB Typical Step Error
Low Insertion Loss: 1 dB
High IP3: +50 dBm
Single Control Line Per Bit
TTL/CMOS Compatible Control
Single +5V Supply
3x3 mm SMT Package
The HMC540LP3 & HMC540LP3E are broadband
4-bit GaAs IC digital attenuators in low cost leadless
surface mount packages. This single positive control
line per bit digital attenuator utilizes off chip AC
ground capacitors for near DC operation, making it
suitable for a wide variety of RF and IF applications.
Covering DC to 5.5 GHz, the insertion loss is less
than 1 dB typical. The attenuator bit values are
1 (LSB), 2, 4 and 8 dB for a total attenuation of 15 dB.
Attenuation accuracy is excellent at ± 0.2 dB typical
step error. The attenuator also features a IIP3 of +50
dBm. Four TTL/CMOS control inputs are used to
select each attenuation state. A single Vdd bias of
+5V is required.
Parameter Frequency (GHz) Min. Typ. Max. Units
Insertion Loss
DC - 2.0 GHz
2.0 - 3.0 GHz
3.0 - 4.0 GHz
4.0 -5.5 GHz
0.8
1.0
1.3
2.2
1.1
1.3
1.6
2.6
dB
dB
dB
dB
Attenuation Range DC - 5.5 GHz 15 dB
Return Loss (RF1 & RF2, All Atten. States) DC - 3.5 GHz
3.5 - 5.5 GHz
20
15
dB
dB
Attenuation Accuracy:
(Referenced to Insertion Loss) All States
DC - 1.0 GHz
1.0 - 4.0 GHz
4.0 - 5.0 GHz
5.0 - 5.5 GHz
± (0.2 + 2% of Atten. Setting) Max.
± (0.2 + 3% of Atten. Setting) Max.
± (0.3 + 5% of Atten. Setting) Max.
± (0.4 + 8% of Atten. Setting) Max.
dB
dB
dB
dB
Input Power for 0.1 dB Compression 0.1 - 5.5 GHz 27 dBm
Input Third Order Intercept Point
(Two-Tone Input Power= 0 dBm Each Tone)
REF - 4 dB States
5 - 15 dB States 0.1 - 5.5 GHz 50
45
dBm
dBm
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
DC -5.5 GHz
95
100
ns
ns
Typical Applications Features
General Discription
ATTENUATORS - SMT
5
5 - 171
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
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
-3
-2.5
-2
-1.5
-1
-0.5
0
0123456
+25 C
+85 C
-40 C
INSERTION LOSS (dB)
FREQUENCY (GHz)
-1
-0.5
0
0.5
1
1.5
2
0 4 8 12 16
BIT ERROR (dB)
ATTENUATION STATE (dB)
5 GHz5.5 GHz
1 GHz 100 MHz
4 GHz
-20
-16
-12
-8
-4
0
0123456
NORMALIZED ATTENUATION (dB)
FREQUENCY (GHz)
-1
-0.5
0
0.5
1
1.5
0123456
BIT ERROR (dB)
FREQUENCY (GHz)
8 dB15 dB
1-4 dB
-40
-30
-20
-10
0
10
20
30
40
0123456
RELATIVE PHASE (deg)
FREQUENCY (GHz)
15 dB
8 dB
1-4 dB
-40
-30
-20
-10
0
0123456
RETURN LOSS (dB)
FREQUENCY (GHz)
1 dB 2 dB 4 dBI.L.dB 8 dB 15 dB
HMC540LP3 / 540LP3E
1 dB LSB GaAs MMIC 4-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 5.5 GHz
v00.0605
ATTENUATORS - SMT
5
5 - 172
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
Truth Table
Control Voltage
Bias Voltage & Current
Worst Case Step Error
Between Successive Attenuation States
Vdd = +5.0 Vdc ± 10%
Vdd
(VDC)
Idd (Typ.)
(mA)
+4.5 3.0
+5.0 3.2
+5.5 3.4
State Bias Condition
Low 0 to +0.8V @ -5 uA Typ.
High +2.0 to + 5.0 Vdc @ 40 uA Typ.
Note: Vdd = +5V
Control Voltage Input Attenuation
State
RF1 - RF2
V1
8 dB
V2
4 dB
V3
2 dB
V4
1 dB
High High High High Reference
I.L.
High High High Low 1 dB
High High Low High 2 dB
High Low High High 4 dB
Low High High High 8 dB
Low Low Low Low 15 dB
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0123456
STEP ERROR (dB)
FREQUENCY (GHz)
HMC540LP3 / 540LP3E
1 dB LSB GaAs MMIC 4-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 5.5 GHz
v00.0605
ATTENUATORS - SMT
5
5 - 173
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
Absolute Maximum Ratings
Outline Drawing
RF Input Power (DC - 5.5 GHz) +29 dBm (T = +85 °C)
Control Voltage Range (V1 to V4) -1V to Vdd +1V
Bias Voltage (Vdd) +7.0 Vdc
Channel Temperature 150 °C
Continuous Pdiss (T = 85 °C)
(derate 11.7 mW/°C above 85 °C) 0.769 W
Thermal Resistance 85 °C/W
Storage Temperature -65 to +150 °C
Operating Temperature -40 to +85 °C
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.
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
HMC540LP3 / 540LP3E
1 dB LSB GaAs MMIC 4-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 5.5 GHz
v00.0605
Part Number Package Body Material Lead Finish MSL Rating Package Marking [3]
HMC540LP3 Low Stress Injection Molded Plastic Sn/Pb Solder MSL1 [1] 540
XXXX
HMC540LP3E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] 540
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
ATTENUATORS - SMT
5
5 - 174
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
Pin Descriptions
Pin Number Function Description Interface Schematic
1Vdd Supply Voltage.
2, 11 RF1, RF2
This pin is DC coupled and matched to 50 Ohm.
Blocking capacitors are required.
Select value based on lowest frequency of operation.
3, 7, 9, 10, 12 N/C These pins should be connected to PCB RF ground to
maximize performance.
4 - 6, 8 ACG1 - ACG4
External capacitor to ground is required. Select value for
lowest frequency of operation. Place capacitor as close
to pins as possible.
13 - 16 V1 - V4 See truth table and control voltage table.
GND Package bottom has an exposed metal paddle that must be
connected to RF/DC Ground.
Application Circuit
HMC540LP3 / 540LP3E
1 dB LSB GaAs MMIC 4-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 5.5 GHz
v00.0605
Recommended Component Values
C1 - C3 1,000 pF ± 10%
C4, C5 330 pF ± 10%
ATTENUATORS - SMT
5
5 - 175
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
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.
List of Materials for Evaluation PCB 111315 [1]
Item Description
J1 - J2 PCB Mount SMA Connector
J3 - J8 DC Pin
C1 - C3 1000 pF Capacitor, 0402 Pkg.
C4, C5 330 pF Capacitor, 0402 Pkg.
U1 HMC540LP3 / HMC540LP3E
Digital Attenuator
PCB [2] 111291 Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350
HMC540LP3 / 540LP3E
1 dB LSB GaAs MMIC 4-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 5.5 GHz
v00.0605
