HMC305LP4 / 305LP4E
v03.0809
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
5
ATTENUATORS - DIGITAL - SMT
Typical Applications
The HMC305LP4 / HMC305LP4E is ideal for:
• Cellular/3G Infrastructure
• Fixed Wireless, WiMax & WiBro
• Test Instrumentation
Functional Diagram
Features
0.5 dB LSB Steps to 15.5 dB
CMOS Compatible Serial Data Interface
SPI Compatible Serial Output
±0.3 dB Typical Bit Error
24 Lead 4x4mm QFN Package: 16mm
Included in the HMC-DK004 Designer’s Kit
General Description
The HMC305LP4 & HMC305LP4E are broadband
5-bit positive control GaAs IC digital attenuators with
CMOS compatible serial-to-parallel drivers packaged
in leadless QFN 4x4 mm SMT packages. Covering
0.7 to 3.8 GHz, the insertion loss is typically less
than 1.5 to 2 dB. The attenuator bit values are 0.5
(LSB), 1, 2, 4, and 8 dB for a total attenuation of
15.5 dB. Attenuation accuracy is excellent at ±0.25
dB typical with an IIP3 of up to +52 dBm. Five bit
serial control words are used to select each attenuation
state. A single Vcc bias of +3V to +5V applied through
an external 5k Ohm resistor is required.
5 - 60
Electrical Speci cations, T
Parameter Frequency Min. Typical Max. Units
Insertion Loss
Attenuation Range 0.7 - 3.8 GHz 15.5 dB
Return Loss (RF1 & RF2, All Atten. States)
Attenuation Accuracy: (Referenced to Insertion Loss)
All Attenuation States
Input Power for 0.1 dB Compression
Input Third Order Intercept Point
(Two-tone Input Power = 0 dBm Each Tone)
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (Latch Enable to 10/90% RF)
= +25° C, Vcc = +3V to +5V
A
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.8 GHz
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.8 GHz
0.7 - 0.9 GHz
0.9 - 2.2 GHz
2.2 - 3.8 GHz
Vcc = 5V
Vcc = 3V
Vcc = 5V
Vcc = 3V
0.7 - 3.8 GHz
0.7 - 3.8 GHz
0.7 - 3.8 GHz
1. 2
1. 5
1. 8
2.0
17
18
19
15
± (0.5 +5% of Atten. Setting) Max
± (0.3 +4% of Atten. Setting) Max
± (0.5 +5% of Atten. Setting) Max
25
23
52
48
750
830
1. 5
2.0
2.3
2.5
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
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dBm
dBm
ns
ns
1
HMC305LP4 / 305LP4E
v03.0809
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
Insertion Loss
0
-0.5
-1
-1.5
-2
-2.5
INSERTION LOSS (dB)
-3
-3.5
-4
0.5 1 1.5 2 2.5 3 3.5 4
FREQUENCY (GHz)
+25C
+85C
-40C
Normalized Attenuation
(Only Major States are Shown)
0
-2
-4
-6
-8
-10
-12
-14
NORMALIZED ATTENUATION (dB)
-16
0.5 1 1.5 2 2.5 3 3.5 4
FREQUENCY (GHz)
Return Loss RF1, RF2
(Only Major States are Shown)
0
-5
-10
-15
-20
RETURN LOSS (dB)
-25
-30
0.5 1 1.5 2 2.5 3 3.5 4
1 dB
8 dB2 dB 15.5 dB0.5 dB
FREQUENCY (GHz)
I.L.
Bit Error
vs. Attenuation State
1
0.75
0.5
0.25
0
BIT ERROR (dB)
-0.25
-0.5
02468101214
3.5 GHz
2.4 GHz
0.9 GHz1.9 GHz
5
4 dB
ATTENUATORS - DIGITAL - SMT
Bit Error vs. Frequency
(Only Major States are Shown)
3
2
8 dB
1
15.5 dB
BIT ERROR (dB)
0
-1
0.5 1 1.5 2 2.5 3 3.5 4
FREQUENCY (GHz)
Note: All Data Typical Over Voltage (+3V to +5V) & Temperature (-40 to +85 deg. C.).
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
0.5, 1, 2, 4 dB
Relative Phase vs. Frequency
(Only Major States are Shown)
60
40
20
0
-20
RELATIVE PHASE (deg.)
-40
-60
0 0.5 1 1.5 2 2.5 3 3.5 4
Order On-line at www.hittite.com
15.5 dB
0.5, 1, 2, 4, 8 dB
FREQUENCY (GHz)
5 - 61
HMC305LP4 / 305LP4E
v03.0809
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
5
ATTENUATORS - DIGITAL - SMT
Worst Case Step Error
Between Successive Attenuation States
1.2
0.8
0.4
0
-0.4
STEP ERROR (dB)
-0.8
-1.2
0.5 1 1.5 2 2.5 3 3.5 4
FREQUENCY (GHz)
Timing
Parameter
Serial Input Setup
Time
Hold time from Serial
Input to Shift Clock
Setup time from
Shift Clock to Latch
Enable
Propagation delay,
Latch Enable to C0.5
through C8
Setup time from
Reset to Shift Clock
Clock Frequency
(1/t cl k)
Symbol Vcc = +5V Vcc = +3V Units
Min. Max. Min. Max.
ts 20 - 100 - ns
th 0 - 5 - ns
tlsup 40 - 100 - ns
tpd - 30 - 70 ns
-20-50-ns
fclk - 30 - 10 MHz
Digital Control Voltages
State Vcc = +5V Vcc = +3V
Low 0 to 1.3V 0 to 0.7V
High 3.5 to 5V 2.3 to 3V
Serial Input Truth Table
Latch
Enable
X X L Shift register cleared
X
Shift
Clock
Reset Function
H Shift register clocked
XH
Contents of shift register
transferred to Digital
Attenuator
Truth Table
Serial Control Input Attenuation
C 0.5 C 1 C 2 C 4 C 8
High High High High High
Low High High High High 0.5 dB
High Low High High High 1 dB
High High Low High High 2 dB
High High High Low High 4 dB
High High High High Low 8 dB
Low Low Low Low Low
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
Setting
RF1 - RF2
Reference
I.L.
15.5 dB
Max. Atten.
5 - 62
Timing Diagram
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
HMC305LP4 / 305LP4E
v03.0809
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
Logic / Functional Diagram
5
Programming Example to Select 0.5 dB Attenuation State
ATTENUATORS - DIGITAL - SMT
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
5 - 63
HMC305LP4 / 305LP4E
v03.0809
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
5
ATTENUATORS - DIGITAL - SMT
Pin Descriptions
Pin Number Function Description Interface Schematic
1, 3, 4, 6, 10, 12, 13,
15, 16, 18
2, 17 RF1, RF2
5Serial Output
7
8Shift Clock
9Latch Enable
N/C
Reset
These pins should be connected to PCB RF ground to
maximize performance.
This pin is DC coupled and matched to 50 Ohms
Blocking capacitors are required. Select value based
on lowest frequency of operation.
Serial data output. Serial input data
delayed by 8 clock cycles
See truth table, control voltage table and timing diagram.
11 Ser ial I n p u t
14 Vcc Su pp ly Vo lt age.
19 - 24 GND
Package bottom has an exposed metal paddle that must also
be connected to RF/DC Ground.
5 - 64
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
HMC305LP4 / 305LP4E
v03.0809
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
Application Circuit
5
DC blocking capacitors C1 & C2 are required on RF1 & RF2. Choose C1 = C2 = 100 ~ 300 pF to allow lowest customer speci c
frequency to pass with minimal loss. R1 = 5k Ohm is required to supply voltage to the circuit through either PIN 2 or PIN 17.
ATTENUATORS - DIGITAL - SMT
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
5 - 65
HMC305LP4 / 305LP4E
v03.0809
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
5
Absolute Maximum Ratings
Digital Inputs (Reset, Shift Clock,
Latch Enable & Serial Input)
Digital Outputs (Serial Output) -0.5 to (Vcc + 0.5) V
DC Current on Serial Output ±35 mA
Bias Voltage (Vcc) +7V
Storage Temperature -65 to +150 °C
Operating Temperature -40 to +85 °C
RF Input Power (0.7 - 3.8 GHz) +26 dBm
ESD Sensitivity (HBM) Class 1A
-1.5 to (Vcc + 1.5) V
Outline Drawing
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
ATTENUATORS - DIGITAL - SMT
NOTES:
1. LEADFRAME MATERIAL: COPPER A LLOY
2. DIMENS IONS ARE IN INCHES [MILLIMETERS]
3. LEAD SPACIN G TOLERAN CE IS NON -CUMULATIVE
4. PAD BURR LENGTH S HALL BE 0.15mm MAXIMUM.
PAD BURR HEIGHT SHALL BE 0.0 5mm MA XIMUM.
5. PACKAGE WARP SHALL NOT EXCEED 0.05mm.
6. ALL GROUND LEADS A ND GROUN D PADDLE MUST BE
SOLDERED TO PCB RF GROUN D.
7. REFER TO HITTITE APPLI CATION NOTE FOR SUG GESTED
LAND PATTERN.
Package Information
Part Number Package Body Material Lead Finish MSL Rating Package Marking
HMC305LP4 Low Stress Injection Molded Plastic Sn/Pb Solder
HMC305LP4E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn
[1] Max peak re ow temperature of 235 °C
[2] Max peak re ow temperature of 260 °C
[3] 4-Digit lot number XXXX
MSL1
MSL1
[1]
[2]
[3]
H305
XXXX
H305
XXXX
5 - 66
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
HMC305LP4 / 305LP4E
v03.0809
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
Evaluation Circuit Board
5
List of Materials for Evaluation PCB 108782
Item Description
J1 - J2 PCB Mount SMA Connector
J3 2 mm Molex Header
C1, C2 100 pF Capacitor, 0402 Pkg.
C3 0.01 µF Capacitor, 0402 Pkg.
R1 5k Ohm Resistor, 0402 Pkg.
U1
[2]
PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350
HMC305LP4 / HMC305LP4E
Digital Attenuator
108780 Evaluation PCB
ATTENUATORS - DIGITAL - SMT
[1]
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 ground paddle
should be connected directly to the ground plane
similar to that shown below. A sufficient number
of via holes should be used to connect the top
and bottom ground planes. The evaluation circuit
board as shown is available from Hittite Microwave
Corporation upon request.
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
5 - 67
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