9 - 52
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 Online at www.hittite.com
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HMC305LP4
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
v00.1004
General Description
Features
Functional Diagram
0.5 dB LSB Steps to 15.5 dB
CMOS Compatible Serial Data Interface
SPI Compatible Serial Output
+/- 0.3 dB Typical Bit Error
Electrical Specifi cations,
T
A
= +25 C, Vcc = +3V to +5V
Typical Applications
The HMC305LP4 is a broadband 5-bit positive
control GaAs IC digital attenuator with a serial-to-
parallel driver packaged in a leadless QFN 4 x 4
mm SMT package. 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 accu-
racy 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.
The HMC305LP4 is ideal for:
Cellular/3G Infrastructure
Fixed Wireless & WiMax
Test Instrumentation
Parameter
Frequency
Min.
Typical
Max.
Units
Insertion Loss
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.8 GHz
1.2
1.5
1.8
2.0
1.5
2.0
2.3
2.5
dB
dB
dB
dB
Attenuation Range
0.7 - 3.8 GHz
15.5
dB
Return Loss (RF1 & RF2, All Atten. States)
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 3.8 GHz
17
18
19
15
dB
dB
dB
dB
Attenuation Accuracy: (Referenced to Insertion Loss)
All Attenuation States
0.7 - 3.8 GHz
0.5 5% of Atten. Setting Max
dB
dB
Input Power for 0.1 dB Compression
Vcc = 5V
Vcc = 3V
0.7 - 3.8 GHz
25
23
dBm
dBm
Input Third Order Intercept Point
(Two-tone Input Power = 0 dBm Each Tone)
Vcc = 5V
Vcc = 3V
0.7 - 3.8 GHz
52
48
dBm
dBm
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (Latch Enable to 10/90% RF)
0.7 - 3.8 GHz
750
830
ns
ns
9 - 53
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
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HMC305LP4
Bit Error
vs. Attenuation State
Return Loss RF1, RF2
(Only Major States are Shown)
Insertion Loss
Normalized Attenuation
(Only Major States are Shown)
v00.1004
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
Note: All Data Typical Over Voltage (+3V to +5V) & Temperature (-40 to +85 deg. C.).
Bit Error vs. Frequency
(Only Major States are Shown)
Relative Phase vs. Frequency
(Only Major States are Shown)
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
+25C
+85C
-40C
INSERTION LOSS (dB)
FREQUENCY (GHz)
-30
-25
-20
-15
-10
-5
0
0.5
1
1.5
2
2.5
3
3.5
4
RETURN LOSS (dB)
FREQUENCY (GHz)
1 dB
0.5 dB
15.5 dB
2 dB
8 dB
4 dB
I.L.
-16
-14
-12
-10
-8
-6
-4
-2
0
0.5
1
1.5
2
2.5
3
3.5
4
NORMALIZED ATTENUATION (dB)
FREQUENCY (GHz)
-0.5
-0.25
0
0.25
0.5
0.75
1
0
2
4
6
8
10
12
14
16
BI
T ERROR (dB)
ATTENUATION STATE (dB)
2.4 GHz
0.9 GHz
1.9 GHz
3.5 GHz
-1
0
1
2
3
0.5
1
1.5
2
2.5
3
3.5
4
BI
T ERROR (dB)
FREQUENCY (GHz)
8 dB
15.5 dB
0.5, 1, 2, 4 dB
-60
-40
-20
0
20
40
60
0
0.5
1
1.5
2
2.5
3
3.5
4
RELATIVE PHASE (deg.)
FREQUENCY (GHz)
15.5 dB
0.5, 1, 2, 4, 8 dB
9 - 54
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20 Alpha Road Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
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Truth Table
Serial Control Input
Attenuation
Setting
RF1 - RF2
C 0.5
C 1
C 2
C 4
C 8
High
High
High
High
High
Reference
I.L.
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
15.5 dB
Max. Atten.
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
HMC305LP4
v00.1004
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
Worst Case Step Error
Between Successive Attenuation States
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
0.5
1
1.5
2
2.5
3
3.5
4
STEP ERROR (dB)
FREQUENCY (GHz)
CMOS Control Voltages
State
Vcc = +5V
Vcc = +3V
Low
0 to 1.3V
0 to 0.7V
High
3.5 to 5.0V
2.3 to 3.0V
Parameter
Symbol
Vcc = +5V
Vcc = +3V
Unit
Min.
Max.
Min.
Max.
Serial IN Setup Time
T1
20
60
ns
Serial IN Hold Time
T2
5
5
ns
Latch EN Hold Time
T3
20
60
ns
Clock Frequency
f
CLK
25
8
MHz
Clock Period
T4
1/
f
CLK
Timing
Timing Diagram
9 - 55
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 Online at www.hittite.com
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ORS - SMT
9
HMC305LP4
v00.1004
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
Absolute Maximum Ratings
Outline Drawing
Digital Inputs (Reset, Shift Clock,
Latch Enable & Serial In)
-1.5 to (Vcc + 1.5) Vdc
Digital Outputs (Serial Out)
-0.5 to (Vcc + 0.5)Vcc
DC Current on Serial Output
35mA
Bias Voltage (Vcc)
+7.0 Vdc
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
NOTES:
1. MATERIAL PACKAGE BODY: LOW STRESS INJECTION MOLDED
PLASTIC SILICA AND SILICON IMPREGNATED.
2. LEAD AND GROUND PADDLE MATERIAL: COPPER ALLOY
3. LEAD AND GROUND PADDLE PLATING: Sn/Pb SOLDER
4. DIMENSIONS ARE IN INCHES [MILLIMETERS].
5. LEAD SPACING TOLERANCE IS NON-CUMULATIVE
6. PAD BURR LENGTH SHALL BE 0.15mm MAXIMUM.
PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM.
7. PACKAGE WARP SHALL NOT EXCEED 0.05mm.
8. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED
TO PCB RF GROUND.
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
9 - 56
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 Online at www.hittite.com
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ORS - SMT
9
HMC305LP4
v00.1004
0.5 dB LSB GaAs MMIC 5-BIT SERIAL
CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz
Pin Descriptions
Pin Number
Function
Description
Interface Schematic
1, 3, 4, 6, 10, 12, 13,
15, 16, 18
N/C
These pins should be connected to PCB RF ground to
maximize performance.
2, 17
RF1, RF2
This pin is DC coupled and matched to 50 Ohms
Blocking capacitors are required. Select value based on lowest
frequency of operation.
5
Serial Out
Serial data output. Serial input data
delayed by 8 clock cycles
7
Reset
See truth table, control voltage table and timing diagram.
8
Shift Clock
9
Latch Enable
11
Serial In
14
Vcc
Supply Voltage.
19 - 24
GND
Package bottom has an exposed metal paddle that must also
be connected to RF/DC Ground.
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