9
A
T
T
E
N
U
A
T
O
R
S - SM
T
9 - 144
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
HMC472LP4
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 3.0 GHz
v00.0604
Functional Diagram
Electrical Specifi cations,
T
A
= +25 C, With Vdd = +5V & Vctl = 0/+5V (Unless Otherwise Noted)
Typical Applications
The HMC472LP4 is ideal for both RF
and IF applications:
Cellular; UMTS/3G Infrastructure
ISM, MMDS, WLAN, WiMAX
Microwave Radio & VSAT
Test Equipment & Sensors
Features
0.5 dB LSB Steps to 31.5 dB
Single Control Line Per Bit
TTL/CMOS Compatible Control
+/- 0.5 dB Typical Step Error
Single +5V Supply
4 mm x 4 mm x 1 mm SMT Package
General Description
The HMC472LP4 is a broadband 6-bit GaAs IC
digital attenuator in a low cost leadless surface
mount package. This single positive control line
per bit digital attenuator incorporates off chip
AC ground capacitors for near DC operation,
making it suitable for a wide variety of RF and IF
applications. Covering DC to 3.0 GHz, the
insertion loss is less than 2.0 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 +45 dBm. Six
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 - 1.5 GHz
1.5 - 3.0 GHz
1.5
2.0
1.8
2.3
dB
dB
Attenuation Range
DC - 3.0 GHz
31.5
dB
Return Loss (RF1 & RF2, All Atten. States)
DC - 3.0 GHz
15
dB
Attenuation Accuracy:
(Referenced to Insertion Loss)
REF - 15.5 dB
16.0 - 31.5 dB
DC - 3.0 GHz
(0.4 + 4% of Atten. Setting) Max.
(0.5 + 4% of Atten. Setting) Max.
dB
dB
Input Power for 0.1 dB Compression
0.1 - 3.0 GHz
20
dBm
Input Third Order Intercept Point
(Two-Tone Input Power= 0 dBm Each Tone)
REF - 15.5 dB States
16.0 - 31.5 dB States
0.1 - 3.0 GHz
45
35
dBm
dBm
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
DC - 3.0 GHz
130
140
ns
ns
9
A
T
T
E
N
U
A
T
O
R
S - SM
T
9 - 145
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
GaAs MMIC SUB-HARMONICALLY PUMPED MIXER 17 - 25 GHz
HMC472LP4
Return Loss RF1, RF2
(Only Major States are Shown)
v00.0604
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
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 3.0 GHz
-3
-2.5
-2
-1.5
-1
-0.5
0
0
0.5
1
1.5
2
2.5
3
3.5
4
+25 C
+85 C
-40 C
INSERTION LOSS (dB)
FREQUENCY (GHz)
-35
-30
-25
-20
-15
-10
-5
0
0
0.5
1
1.5
2
2.5
3
3.5
4
RETURN LOSS (dB)
FREQUENCY (GHz)
0.5-16 dB
31.5 dB
-35
-30
-25
-20
-15
-10
-5
0
0
0.5
1
1.5
2
2.5
3
3.5
4
NORMALI
ZED ATTENUATI
ON (dB)
FREQUENCY (GHz)
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0
4
8
12
16
20
24
28
32
BI
T ERROR (dB)
ATTENUATION STATE (dB)
3 GHz
2 GHz
1 GHz
500 MHz
40 MHz
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
0
0.5
1
1.5
2
2.5
3
3.5
4
BI
T ERROR (dB)
FREQUENCY (GHz)
16 dB
31.5 dB
8 dB
0.5-4 dB
-40
-20
0
20
40
60
80
100
0
0.5
1
1.5
2
2.5
3
3.5
4
RELATIVE PHASE (deg)
FREQUENCY (GHz)
8 dB
16 dB
31.5 dB
0.5-4 dB
9
A
T
T
E
N
U
A
T
O
R
S - SM
T
9 - 146
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
4.7
+5.0
5.0
+5.5
5.3
State
Bias Condition
Low
0 to +0.8 Vdc @ -5 uA Typ.
High
+ 2.0 to + 5.0 Vdc @ 40 uA Typ.
Note: Vdd = +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
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0
0.5
1
1.5
2
2.5
3
3.5
4
STEP ERROR (dB)
FREQUENCY (GHz)
HMC472LP4
v00.0604
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 3.0 GHz
9
A
T
T
E
N
U
A
T
O
R
S - SM
T
9 - 147
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 - 3.0 GHz)
+27 dBm (T = +85 C)
Control Voltage Range (V1 to V6)
-1V to Vdd +1V
Bias Voltage (Vdd)
+7.0 Vdc
Channel Temperature
150 C
Continuous Pdiss (T = 85 C)
(derate 7.7 mW/C above 85 C)
0.5 W
Thermal Resistance
130 C/W
Storage Temperature
-65 to +150 C
Operating Temperature
-40 to +85 C
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.
9. CLASSIFIED AS MOISTURE SENSITIVITY LEVEL (MSL) 1.
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
HMC472LP4
v00.0604
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 3.0 GHz
9
A
T
T
E
N
U
A
T
O
R
S - SM
T
9 - 148
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
1, 3, 5, 12,
14, 16, 17, 18
N/C
These pins should be connected to PCB RF ground to
maximize performance.
2
Vdd
Supply Voltage.
4, 15
RF1, RF2
This pin is DC coupled and matched to 50 Ohm.
Blocking capacitors are required. Select value based on
lowest frequency of operation.
6 - 11, 13
ACG1 - ACG7
External capacitor to ground is required. Select value for
lowest frequency of operation. Place capacitor as close
to pins as possible.
19 - 24
V1 - V6
See truth table and control voltage table.
GND
Package bottom has an exposed metal paddle that must also
be connected to RF/DC Ground.
Application Circuit
HMC472LP4
v00.0604
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
POSITIVE CONTROL ATTENUATOR, DC - 3.0 GHz
PDF 
ZIP